Date: Thu, 29 Sep 11 00:07:09 GMT Subject: hep-ph daily 21 new + 11 crosses received by eprepget ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ Send any comments regarding submissions directly to submitter. ------------------------------------------------------------------------------ Archives at http://arxiv.org/ To unsubscribe, e-mail To: hep-ph@arXiv.org, Subject: cancel ------------------------------------------------------------------------------ received by eprepget from Tue 27 Sep 11 20:00:00 GMT to Wed 28 Sep 11 20:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:1109.6009 Date: Tue, 27 Sep 2011 20:00:01 GMT (199kb) Title: Dark Matter Jets at the LHC Authors: Yang Bai and Arvind Rajaraman Categories: hep-ph astro-ph.HE hep-ex Comments: 4 pages, 2 figures Report-no: SLAC-PUB-14617, UCI-TR-2011-21 \\ We argue that dark matter particles which have strong interactions with the Standard Model particles are not excluded by current astrophysical constraints. These dark matter particles have unique signatures at colliders; instead of missing energy, the dark matter particles produce jets. We propose a new search strategy for such strongly interacting particles by looking for a signal of two trackless jets. We show that suitable cuts can plausibly allow us to find these signals at the LHC even in early data. \\ ( http://arxiv.org/abs/1109.6009 , 199kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6014 Date: Tue, 27 Sep 2011 20:00:10 GMT (749kb) Title: Large Jet Multiplicities and New Physics at the LHC Authors: Joseph Bramante, Jason Kumar, Brooks Thomas Categories: hep-ph hep-ex Comments: 23 pages, ReVTeX, 6 figures, 2 tables Report-no: UH-511-1178-11 \\ A broad class of scenarios for new physics involving additional strongly-interacting fields generically predict signatures at hadron colliders which consist solely of large numbers of jets and substantial missing transverse energy. In this work, we investigate the prospects for discovery in such scenarios using a search strategy in which jet multiplicity and missing transverse energy are employed as the primary criteria for distinguishing signal from background. We examine the discovery reach this strategy affords in an example theory (a simplified supersymmetric model whose low-energy spectrum consists of a gluino, a light stop, and a light neutralino) and demonstrate that it frequently exceeds the reach obtained via other, alternative strategies. \\ ( http://arxiv.org/abs/1109.6014 , 749kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6027 Date: Tue, 27 Sep 2011 20:19:30 GMT (2976kb) Title: Electroweak Gauge-Boson Production at Small q_T: Infrared Safety from the Collinear Anomaly Authors: Thomas Becher, Matthias Neubert and Daniel Wilhelm Categories: hep-ph Comments: 34 pages, 9 figures Report-no: MZ-TH/11-29 \\ Using methods from effective field theory, we develop a novel, systematic framework for the calculation of the cross sections for electroweak gauge-boson production at small and very small transverse momentum q_T, in which large logarithms of the scale ratio M_V/q_T are resummed to all orders. These cross sections receive logarithmically enhanced corrections from two sources: the running of the hard matching coefficient and the collinear factorization anomaly. The anomaly leads to the dynamical generation of a non-perturbative scale q_* ~ M_V e^{-const/\alpha_s(M_V)}, which protects the processes from receiving large long-distance hadronic contributions. Expanding the cross sections in either \alpha_s or q_T generates strongly divergent series, which must be resummed. As a by-product, we obtain an explicit non-perturbative expression for the intercept of the cross sections at q_T=0, including the normalization and first-order \alpha_s(q_*) correction. We perform a detailed numerical comparison of our predictions with the available data on the transverse-momentum distribution in Z-boson production at the Tevatron and LHC. \\ ( http://arxiv.org/abs/1109.6027 , 2976kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6055 Date: Tue, 27 Sep 2011 22:28:55 GMT (10kb) Title: Neutrino oscillations and superluminal propagation Authors: Joao Magueijo Categories: hep-ph \\ We digress on the implications of recent claims of superluminal neutrino propagation. No matter how we turn it around such behaviour is very odd and sits uncomfortably even within "far-fetched" theories. In the context of non-linear realizations of the Lorentz group (where superluminal misbehaviour is run of the mill) one has to accept rather contrived constructions to predict superluminal properties for the neutrino. The simplest explanation is to require that at least one of the mass states be tachyonic. We show that due to neutrino mixing, the flavor energy does not suffer from the usual runaway pathologies of tachyons. For non-tachyonic mass states the theories become more speculative. A neutrino specific dispersion relation is exhibited, rendering the amplitude of the effect reasonable for a standard Planck energy. This uses the fact that the beam energy is close to the geometrical average of the neutrino and Planck mass; or, seen in another way, the beam energy is unexceptional but its gamma factor is very large. A dispersion relation crossing over from a low energy bradyonic branch to a high energy tachyonic one is also considered. \\ ( http://arxiv.org/abs/1109.6055 , 10kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6066 Date: Wed, 28 Sep 2011 00:19:19 GMT (23kb) Title: Fluid QCD approach for quark-gluon plasma in stellar structure Authors: T.P. Djun, L.T. Handoko Categories: hep-ph gr-qc nucl-th Comments: 7 pages, Proceeding of the Conference in Honour of Murray Gell-Mann's 80th Birthday : Quantum Mechanics, Elementary Particles, Quantum Cosmology, Complexity (2011) 419-425 Report-no: FISIKALIPI-10033 DOI: 10.1142/9789814335614_0040 \\ The quark-gluon plasma in stellar structure is investigated using the fluid-like QCD approach. The classical energy momentum tensor relevant for high energy and hot plasma having the nature of fluid bulk of gluon sea is calculated within the model. The transition of gluon field from point particle field inside stable hadrons to relativistic fluid field in hot plasma and vice versa is briefly discussed. The results are applied to construct the equation of state using the Tolman--Oppenheimer--Volkoff equation to describe the hot plasma dominated stellar structure. \\ ( http://arxiv.org/abs/1109.6066 , 23kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6067 Date: Wed, 28 Sep 2011 00:29:48 GMT (21kb) Title: Proton decay in 5D SU(6) GUT with orbifold S^1/Z_2 breaking in Scherk-Schwarz mechanism Authors: A. Hartanto, F.P. Zen, J. S. Kosasih, L.T. Handoko Categories: hep-ph Comments: 6 pages, Proceeding of the Conference in Honour of Murray Gell-Mann's 80th Birthday : Quantum Mechanics, Elementary Particles, Quantum Cosmology, Complexity (2011) 544-549 Report-no: FISIKALIPI-10034 DOI: 10.1142/9789814335614_0056 \\ Proton decay within 5-dimensional SU(6) GUT with orbifold S^1/Z_2 breaking is investigated using Scherk-Schwarz mechanism. It is shown that in the model neither leptoquark like heavy gauge bosons nor violation of baryon number conservation are allowed due to the orbifold breaking parity splitting. These results prevent too short proton lifetime within the model. \\ ( http://arxiv.org/abs/1109.6067 , 21kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6097 Date: Mon, 26 Sep 2011 17:47:05 GMT (7kb) Title: Neutrino speed anomaly as a signal of Lorentz violation Authors: Zhou Lingli, Bo-Qiang Ma Categories: hep-ph hep-ex Comments: 8 pages \\ The OPERA experiment just reported that the muon neutrino speed is larger than the vacuum light speed, and such result puts up a challenge to Einstein's theory of relativity and the basic principle of Lorentz invariance. We exam the possibility to attribute Lorentz violation as a source for the neutrino speed anomaly, and relate the OPERA result with Lorentz violation parameters in a new framework of standard model supplement (SMS), in which the Lorentz violation terms are brought about by a new basic principle of physical independence or physical invariance, stating that the equations describing the laws of physics have the same form in all admissible mathematical manifolds. \\ ( http://arxiv.org/abs/1109.6097 , 7kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6160 Date: Wed, 28 Sep 2011 10:36:20 GMT (6kb) Title: The OPERA neutrino velocity result and the synchronisation of clocks Authors: Carlo R. Contaldi Categories: hep-ph astro-ph.CO gr-qc Comments: 3 pages \\ The CERN-OPERA experiment claims to have measured a one-way speed of neutrinos that is apparently faster than the speed of light c. One-way speed measurements such as these inevitably require a convention for the synchronisation of clocks in non-inertial frames since the Earth is rotating. We argue that the effect of the synchronisation convention is not properly taken into account in the analysis of and may well invalidate their interpretation of superluminal neutrino velocity. \\ ( http://arxiv.org/abs/1109.6160 , 6kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6183 Date: Wed, 28 Sep 2011 12:17:35 GMT (16kb) Title: R-Parity violating flavor symmetries, recent neutrino data and absolute neutrino mass scale Authors: Gautam Bhattacharyya, Heinrich P\"as, Daniel Pidt Categories: hep-ph Comments: 9 pages Report-no: SINP/TNP/2011/12, DO-TH-11/20 \\ We study the role of a very general type of flavor symmetry in controlling the strength of R-parity violation in supersymmetric models. We assume that only leptons are charged under a global symmetry whose breaking induces lepton number (and, hence, R-parity) violation. The charge assignments of leptons under this symmetry are such that the total number of independent lepton number violating couplings is reduced from 39 to 6. The most severe constraints on these flavor-correlated couplings arise from neutrino masses and mixing as well as from the non-observation of K_L -> e\mu. We find that such a scenario predicts an almost vanishing smallest neutrino mass eigenvalue, allowing the upcoming generation of neutrinoless double beta decay experiments to shed light on the hierarchy. \\ ( http://arxiv.org/abs/1109.6183 , 16kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6187 Date: Wed, 28 Sep 2011 12:42:17 GMT (206kb) Title: A short review of the theory of hard exclusive processes Authors: Samuel Wallon Categories: hep-ph hep-ex nucl-th Comments: 27 pages, 18 figures, Invited review talk presented at the workshop "30 years of strong interactions", Spa, Belgium, 6-8 April 2011 Report-no: LPT 11-81 \\ We first present an introduction to the theory of hard exclusive processes. We then illustrate this theory by a few selected examples. The last part is devoted to the most recent developments in the asymptotical energy limit. \\ ( http://arxiv.org/abs/1109.6187 , 206kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6197 Date: Wed, 28 Sep 2011 13:19:19 GMT (31kb) Title: Extracting a free neutron structure function from proton and deuteron deep inelastic scattering data Authors: O. Hen, E. Piasetzky, R. Shneor, L. B. Weinstein, D. W. Higinbotham Categories: hep-ph nucl-ex nucl-th Comments: DIS 2011 Conference proceeding \\ Due to the lack of a free neutron target the structure function of the neutron cannot be measured directly and is therefore extracted from deuteron and proton DIS data. Because the deuteron is a bound nuclear system, in order to extract the neutron structure function, one needs to apply model dependent theoretical corrections which dominate the uncertainty at the large xB region. We present here a correlation between the magnitude of the EMC effect and the amount of two nucleon Short Range Correlation (2N-SRC) pairs in nuclei. Using this correlation we propose a phenomenological procedure to extract the free neutron structure function in the xB range of 0.3 to 0.7. \\ ( http://arxiv.org/abs/1109.6197 , 31kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6232 Date: Mon, 26 Sep 2011 15:17:46 GMT (1561kb) Title: Higgs Boson masses and B-Physics Constraints in Non-Minimal Flavor Violating SUSY scenarios Authors: M. Arana-Catania, S. Heinemeyer, M.J. Herrero and S. Penaranda Categories: hep-ph Comments: 58 pages, 15 figures Report-no: IFT-UAM/CSIC-11-57 \\ We present one-loop corrections to the Higgs boson masses in the MSSM with Non-Minimal Flavor Violation. The flavor violation is generated from the hypothesis of general flavor mixing in the squark mass matrices, and these are parameterized by a complete set of delta^XY_ij (X, Y = L,R; i; j = t, c, u or b, s, d). We calculate the corrections to the Higgs masses in terms of these delta^XY_ij taking into account all relevant restrictions from B-physics data. This includes constraints from BR(B -> Xs gamma), BR(Bs -> mu+ mu-) and delta M_B_s . After taking into account these constraints we find sizable corrections to the Higgs boson masses, in the case of the lightest MSSM Higgs boson mass exceeding tens of GeV. These corrections are found mainly for the low tan beta case. In the case of a Higgs boson mass measurement these corrections might be used to set further constraints on delta^XY_ij. \\ ( http://arxiv.org/abs/1109.6232 , 1561kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6243 Date: Wed, 28 Sep 2011 15:33:48 GMT (313kb,D) Title: Are there hadronic bound states above the QCD transition temperature? Authors: Claudia Ratti, Rene Bellwied, Marco Cristoforetti, Maria Barbaro Categories: hep-ph Comments: 15 pages, 4 Figures \\ Recent lattice QCD calculations, at physical pion masses and small lattice spacings that approach the continuum limit, have revealed that non-diagonal quark correlators above the critical temperature are finite up to about 2 $T_c$. Since the transition from hadronic to free partonic degrees of freedom is merely an analytic cross-over, it is likely that, in the temperature regime between 1-2 $T_c$, quark and gluon quasiparticles and pre-hadronic bound states can coexist. The correlator values, in comparison to PNJL model calculations beyond mean-field, indicate that at least part of the mixed phase resides in color-neutral bound states. A similar effect was postulated for the in-medium fragmentation process, i.e. for partons which do not thermalize with the system and thus constitute the non-equilibrium component of the particle emission spectrum from a deconfined plasma phase. Here, for the first time we investigate the likelihood of forming bound states also in the equilibrated, parton dominated phase above $T_c$ which is described by lattice QCD. \\ ( http://arxiv.org/abs/1109.6243 , 313kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6245 Date: Wed, 28 Sep 2011 15:43:07 GMT (1260kb) Title: Gauge Mediated Supersymmetry Breaking in Five Dimensions Authors: Moritz McGarrie Categories: hep-ph hep-th Comments: 137 pages \\ In this thesis we focus on the construction of models in which a supersymmetry breaking hidden sector is located on one fixed point of an extra dimensional interval and the effects are gauge mediated across this interval to the other fixed point where the supersymmetric standard model is located. We use the formalism of current correlators to encode supersymmetry breaking effects and explore flat, warped and deconstructed extra dimensions. We also apply these techniques to models of metastable supersymmetry breaking in N = 1 Supersymmetric Quantum Chromodynamics. \\ ( http://arxiv.org/abs/1109.6245 , 1260kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6256 Date: Wed, 28 Sep 2011 16:08:34 GMT (689kb) Title: Dipole Showers and Automated NLO Matching in Herwig++ Authors: Simon Platzer, Stefan Gieseke Categories: hep-ph Comments: 14 pages, 14 figures Report-no: DESY 11-162, KA-TP-24-2011, HERWIG-11-01, MCnet-11-24 \\ We report on the implementation of a coherent dipole shower algorithm along with an automated implementation for dipole subtraction and for performing POWHEG- and MC@NLO-type matching to next-to-leading order (NLO) calculations. Both programs are implemented as add-on modules to the event generator Herwig++. A preliminary tune of parameters to data acquired at LEP, HERA and Drell-Yan pair production at the Tevatron has been performed, and we find an overall very good description which is slightly improved by the NLO matching. \\ ( http://arxiv.org/abs/1109.6256 , 689kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6271 Date: Wed, 28 Sep 2011 17:00:54 GMT (1126kb) Title: LHC Sensitivity to Wbb Production via Double Parton Scattering Authors: Seth Quackenbush, Edmond L. Berger, C. B. Jackson, and Gabe Shaughnessy Categories: hep-ph Comments: 8 pages, 7 figures, prepared for proceedings of DPF 2011 Report-no: ANL-HEP-CP-11-61 \\ We investigate the potential to observe double parton scattering at the Large Hadron Collider in pp -> W bb X -> mu nu bb X at 7 TeV. Our analysis tests the efficacy of several kinematic variables in isolating the double parton process of interest from the single parton process and relevant backgrounds for the first 10/fb of integrated luminosity. These variables are constructed to expose the independent nature of the two subprocesses in double parton scattering, pp -> mu nu and pp -> bb X. We use next-to-leading order perturbative predictions for the double parton and single parton scattering components of W bb and for the pertinent backgrounds. The next-to-leading order contributions are important for a proper description of some of the observables we compute. We find that the double parton process can be identified and measured with significance ~ 10, provided the double parton scattering effective cross section ~ 12 mb. \\ ( http://arxiv.org/abs/1109.6271 , 1126kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6282 Date: Wed, 28 Sep 2011 18:14:42 GMT (8kb) Title: Apparent faster than light propagation from light sterile neutrinos Authors: Steen Hannestad, Martin S. Sloth Categories: hep-ph Comments: 4 pages Report-no: CERN-PH-TH/2011-236 \\ Recent data from the OPERA experiment seem to point to neutrinos propagating faster than light. One possible physics explanation for such a result is the existence of light sterile neutrinos which can propagate in a higher dimensional bulk and achieve apparent superluminal velocities when measured by an observer confined to the 4D brane of the standard model. Such a model has the advantage of easily being able to explain the non-observation of superluminal neutrinos from SN1987A. Here we discuss the phenomenological implications of such a model and show that it can provide an explanation for the observed faster than light propagation of neutrinos. \\ ( http://arxiv.org/abs/1109.6282 , 8kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6289 Date: Wed, 28 Sep 2011 18:37:04 GMT (68kb) Title: Higher flow harmonics from (3+1)D event-by-event viscous hydrodynamics Authors: Bjoern Schenke, Sangyong Jeon and Charles Gale Categories: hep-ph nucl-th Comments: 10 pages, 13 figures \\ We present event-by-event viscous hydrodynamic calculations of the anisotropic flow coefficients v_2 to v_5 for heavy-ion collisions at the Relativistic Heavy-Ion Collider (RHIC). We study the dependence of different flow harmonics on shear viscosity and the morphology of the initial state. v_3 and higher flow harmonics exhibit a particularly strong dependence on both the initial granularity and shear viscosity. We argue that a combined analysis of all available flow harmonics will allow to determine eta/s of the quark gluon plasma precisely. Presented results strongly hint at a value (eta/s)_QGP < 2/4pi at RHIC. Furthermore, we demonstrate the effect of shear viscosity on pseudo-rapidity spectra and the mean transverse momentum as a function of rapidity. \\ ( http://arxiv.org/abs/1109.6289 , 68kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6293 Date: Wed, 28 Sep 2011 18:48:07 GMT (16kb) Title: On the linearly polarized gluon distributions in the color dipole model Authors: Fabio Dominguez, Jian-Wei Qiu, Bo-Wen Xiao, Feng Yuan Categories: hep-ph nucl-th Comments: 10 pages \\ We show that the linearly polarized gluon distributions appear in the color dipole model as we derive the full cross sections of the DIS dijet production and the Drell-Yan dijet ($\gamma^*$ jet correlation) process. Together with the normal Weizs\"acker-Williams gluon distribution, the linearly polarized one will contribute to the DIS dijet production cross section as the coefficient of the $\cos(2 \Delta \phi) $ term in the correlation limit. We also derive the exact results for the cross section of the Drell-Yan dijet process, and find that the linearly polarized dipole gluon distribution which is identical to the normal dipole gluon distribution involves in the cross section. The results obtained in this paper agree with the previous transverse momentum dependent factorization study. We further derive the small-$x$ evolution of these linearly polarized gluon distributions and find that they rise as $x$ gets small at high energy. \\ ( http://arxiv.org/abs/1109.6293 , 16kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6296 Date: Wed, 28 Sep 2011 18:56:18 GMT (17kb) Title: On the Possibility of Superluminal Neutrino Propagation Authors: Jean Alexandre, John Ellis and Nick E. Mavromatos Categories: hep-ph hep-ex hep-th Comments: 8 pages Report-no: KCL-PH-TH/2011-31, LCTS/2011-16, CERN-PH-TH/2011-240 \\ We analyze the possibility of superluminal neutrino propagation delta v = (v - c)/c > 0 as indicated by OPERA data, in view of previous phenomenological constraints from supernova SN1987a and gravitational Cerenkov radiation. We argue that the SN1987a data rule out delta v ~ (E_\nu/M_N)^N for N \le 2 and exclude, in particular, a Lorentz-invariant interpretation in terms of a `conventional' tachyonic neutrino. We present two toy Lorentz-violating theoretical models, one a Lifshitz-type fermion model with superluminality depending quadratically on energy, and the other a Lorentz-violating modification of a massless Abelian gauge theory with axial-vector couplings to fermions. In the presence of an appropriate background field, fermions may propagate superluminally or subluminally, depending inversely on energy, and on direction. Reconciling OPERA with SN1987a would require this background field to depend on location. \\ ( http://arxiv.org/abs/1109.6296 , 17kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6312 Date: Wed, 28 Sep 2011 19:53:41 GMT (8kb) Title: Relativistic Superluminal Neutrinos Authors: Alex Kehagias Categories: hep-ph gr-qc hep-th Comments: 5 pages \\ We present a possible solution to the OPERA collaboration anomaly for the speed of neutrinos, based on the idea that it is a local effect caused by a scalar field sourced by the earth. The coupling of the scalar to neutrinos effectively changes the background metric where they propagate, leading to superluminality. The strength of the coupling is set by a new mass scale, which is at $1\, {\rm TeV}$ to account for the OPERA anomaly. Moreover, if this scenario is valid, the neutrino velocity depends on the baseline distance between the emission and detection points in such a way that superluminal signals are turn to subluminal for baseline distances roughly larger than the earth radius. \\ ( http://arxiv.org/abs/1109.6312 , 8kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:1108.1720 (*cross-listing*) Date: Mon, 8 Aug 2011 14:27:56 GMT (350kb,D) Title: On the detection of TeV gamma-rays from GRB with km-cube neutrino telescopes --- I. Muon event rate from single GRBs Authors: Tri L. Astraatmadja Categories: astro-ph.HE hep-ph Comments: Thirteen pages, 14 figures. Accepted for publication in MNRAS \\ This is a preliminary study to examine the prospect of detecting TeV photons from $\gamma$-ray bursts (GRB) using km-size neutrino telescopes, specifically for the ANTARES neutrino telescope. Although optimized to detect upgoing neutrino-induced muons, neutrino telescopes nevertheless have a potential to detect high-energy photons by detecting downgoing muons from the electromagnetic cascade induced by the interaction of TeV photons with the Earth's atmosphere. The photon energy spectrum of a GRB is modeled by a simple power law and is normalized by simple energy considerations. Taking into account the absorption of TeV photons by cosmic infrared backgrounds, an optical depth table calculated from a model by \cite{fin10} is used and the arriving number of photons on top of the Earth atmosphere is determined. Muon production in the atmosphere is determined by considering two main channels of muon production: Pion photoproduction and direct muon pair production. The muon energy loss during their traverse from the surface to the bottom of the sea is determined using the standard muon energy loss formula. Assuming different detector sizes, the number of detectable muons from single GRB events located at different redshifts and zenith distances is determined. The background is calculated assuming it consists primarily of cosmic ray-induced downgoing muons. The detection significance is calculated and it can be concluded that to obtain at least $3\sigma$ detection significance, a typical GRB has to be located at redshift $z \lesssim 0.07$ if the detector's muon effective area is $A^{\mu}_{\rm eff} \sim 10^{-2}\;{\rm km}^{2}$, or redshift $z \lesssim 0.15$, if the muon effective area is $A^{\mu}_{\rm eff} \sim 1\;{\rm km}^{2}$. \\ ( http://arxiv.org/abs/1108.1720 , 350kb) ------------------------------------------------------------------------------ \\ arXiv:1109.3546 (*cross-listing*) Date: Fri, 16 Sep 2011 08:08:09 GMT (26kb) Title: Electron-Positron Plasma Drop Formed by Ultra-Intense Laser Pulses Authors: Inga Kuznetsova and Johann Rafelski Categories: physics.plasm-ph hep-ph Comments: 10 pages, 6 figures, submitted to Physical Review D \\ We study the initial properties, and positron annihilation within a small electron-positron plasma drop formed by intense laser pulse energy initiated QED cascade in general far below the chemical (particle yield) equilibrium. We find that the available electrons and positrons equilibrate kinetically, yet despite relatively high particle density the electron-positron annihilation is very slow suggesting a rather long lifespan of the plasma drop. \\ ( http://arxiv.org/abs/1109.3546 , 26kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6010 (*cross-listing*) Date: Tue, 27 Sep 2011 20:00:02 GMT (1435kb) Title: Jet Physics from Static Charges in AdS Authors: Yang-Ting Chien, Matthew D. Schwartz, David Simmons-Duffin, and Iain W. Stewart Categories: hep-th hep-ph Comments: 34 pages, 7 figures Report-no: MIT-CTP 4285 \\ Soft interactions with high-energy jets are explored in radial coordinates which exploit the approximately conformal behavior of perturbative gauge theories. In these coordinates, the jets, approximated by Wilson lines, become static charges in Euclidean AdS. The anomalous dimension of the corresponding Wilson line operator is then determined by the potential energy of the charges. To study these Wilson lines we introduce a "conformal gauge" which does not have kinetic mixing between radial and angular directions, and show that a number of properties of Wilson lines are reproduced through relatively simple calculations. For example, certain non-planar graphs involving multiple Wilson lines automatically vanish. We also discuss the linear growth of the charges' imaginary potential energy with separation, and a relationship between Wilson line diagrams and Witten diagrams. \\ ( http://arxiv.org/abs/1109.6010 , 1435kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6158 (*cross-listing*) Date: Wed, 28 Sep 2011 10:28:17 GMT (86kb) Title: Hidden local symmetry and color confinement Authors: Ryuichiro Kitano Categories: hep-th hep-ph Comments: 20 pages, 3 figures Report-no: TU-890 \\ The hidden local symmetry is a successful model to describe the properties of the vector mesons in QCD. We point out that if we identify this hidden gauge theory as the magnetic picture of QCD, a linearized version of the model simultaneously describes color confinement and chiral symmetry breaking. We demonstrate that such a structure can be seen in the Seiberg dual picture of a softly broken supersymmetric QCD. The model possesses exact chiral symmetry and reduces to QCD when mass parameters are taken to be large. Working in the regime of the small mass parameters, we show that there is a vacuum where chiral symmetry is spontaneously broken and simultaneously the magnetic gauge group is Higgsed. If the vacuum we find persists in the limit of large mass parameters, one can identify the rho meson as the massive magnetic gauge boson, that is an essential ingredient for color confinement. \\ ( http://arxiv.org/abs/1109.6158 , 86kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6170 (*cross-listing*) Date: Wed, 28 Sep 2011 11:19:40 GMT (4kb) Title: The 2d Gross-Neveu Model for Pseudovector Fermions and Tachyonic Mass Generation Authors: V.K.Oikonomou Categories: hep-th gr-qc hep-ph Comments: 4 pages \\ Recent observations in the OPERA experiment suggest that the neutrino could propagate with speed that is superluminal. Based on early theoretical work on tachyonic fermions we shall study a modification of the Gross-Neveu model in two dimensions. We shall see that the theory results to the dynamical generation of real and imaginary masses. These imaginary masses indicate the possibility that tachyonic solutions (or instabilities) could exist in the theory. \\ ( http://arxiv.org/abs/1109.6170 , 4kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6174 (*cross-listing*) Date: Wed, 28 Sep 2011 11:32:31 GMT (1950kb) Title: On the dynamics of classicalization Authors: N. Brouzakis (Univ. of Athens), J. Rizos (Univ. of Ioannina) and N. Tetradis (Univ. of Athens) Categories: hep-th hep-ph Comments: 5 pages, 1 figure \\ We discuss the mechanism through which classicalization may occur during the collapse of a spherical field configuration modelled as a wavepacket. We demonstrate that the phenomenon is associated with the dynamical change of the equation of motion from a second-order partial differential equation of hyperbolic to one of elliptic type. Within this approach, we rederive the known expression for the classicalization radius. We also find indications that classicalization is associated with the absence of wave propagation at distances below the classicalization radius and the generation of outgoing shock waves. The full quantitative picture can be obtained only through the numerical integration of a partial differential equation of mixed type. \\ ( http://arxiv.org/abs/1109.6174 , 1950kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6215 (*cross-listing*) Date: Wed, 28 Sep 2011 14:13:24 GMT (9kb) Title: Superluminal neutrinos and the tachyon's stability in the rotating Universe Authors: R. A. Konoplya Categories: hep-th gr-qc hep-ph Comments: 7 pages, latex \\ It is well-known that a hypothetical particle which moves faster than the light, a \emph{tachyon}, is unstable in the Minkowski space-time. Here we shall show that, contrary to the Minkowski case, the tachyon is stable in the rotating Universe described by a family of the G\"{o}del-like solutions, unless the absolute value of its mass is larger than some constant which is proportional to the universe`s rotation scale. Mathemtically, this is similar to the well-known Breitenlohner-Freedman bound for the asymptotically anti-de Sitter (AdS) space-times. \\ ( http://arxiv.org/abs/1109.6215 , 9kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6249 (*cross-listing*) Date: Wed, 28 Sep 2011 15:46:17 GMT (446kb) Title: Environmental fifth-force hypothesis for the OPERA superluminal neutrino phenomenology: constraints from orbital motions around the Earth Authors: Lorenzo Iorio Categories: gr-qc hep-ph Comments: LaTex2e, 16 pages, no tables, 5 figures \\ It has been recently suggested by Dvali and Vikman [arXiv:1109.5685] that the superluminal neutrino phenomenology of the OPERA experiment may be due to an environmental feature of the Earth, naturally yielding a long-range fifth force of gravitational origin. Its scale length l should not be smaller than one Earth's radius Re, while its upper bound is expected to be slightly smaller than the Earth-Moon distance (60 Re). We analytically work out some orbital effects of a Yukawa-type fifth force for a test particle moving in the modified field of a central body. Our results are quite general since they are not restricted to any particular size of l; moreover, they are valid for an arbitrary orbital configuration of the particle, i.e. for any value of its eccentricity e. We find that the dimensionless strength coupling parameter a is constrained to |a| <= 5\times10-10 for 1 Re <= l <= 4 Re by the laser data of the Earth's artificial satellite LAGEOS II. The Moon perigee allows to obtain |a| <= 3\times10-11 for the Earth-Moon pair in the range 15 Re <= l <= 60 Re. The validity of our results is not necessarily limited to the superluminal OPERA scenario: they generally extend to any theoretical scenario implying a fifth-force of Yukawa-type. \\ ( http://arxiv.org/abs/1109.6249 , 446kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6291 (*cross-listing*) Date: Wed, 28 Sep 2011 18:46:12 GMT (516kb,D) Title: The Halo Model of Large Scale Structure for Warm Dark Matter Authors: Robyn M. Dunstan, Kevork N. Abazajian, Emil Polisensky, Massimo Ricotti Categories: astro-ph.CO hep-ph Comments: 15 pages, 21 figures; submitted to Phys. Rev. D Report-no: UMD-PP-11-012 \\ We present a comprehensive analysis of the halo model of cosmological large to small-scale structure statistics in the case of warm dark matter (WDM) structure formation scenarios. We include the effects of WDM on the linear matter power spectrum, halo density profile, halo concentration relation, halo mass function, subhalo density profile, subhalo mass function and biasing of the smooth dark matter component. As expected, we find large differences at the smallest physical scales in the nonlinear matter power spectrum predicted in the halo model between WDM and cold dark matter even for reasonably high-scale WDM particle masses. We find that significant effects are contributed from the alteration of the halo density profile and concentration, as well as the halo mass function. We further find that the effects of WDM on the subhalo population are important but sub-dominant. Clustering effects of the biasing of the smooth component in WDM is not largely significant. \\ ( http://arxiv.org/abs/1109.6291 , 516kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6298 (*cross-listing*) Date: Wed, 28 Sep 2011 19:04:00 GMT (86kb,D) Title: Supersonic Velocities in Noncommutative Acoustic Black Holes Authors: M. A. Anacleto, F.A. Brito, E. Passos Categories: hep-th gr-qc hep-ph Comments: 12 pages,1 figure, Latex \\ In this paper we derive Schwarzschild and Kerr - like noncommutative acoustic black hole metrics in the (3+1)-dimensional noncommutative Abelian Higgs model. We have found that the changing in the Hawking temperature T_H due to spacetime noncommutativity account for supersonic velocities and analogously may also account for superluminal particles in the general form (v-c)/c=\Delta T_H/8T_H. Assuming this form is also valid for gravitational black holes and particle physics, we have found that for \Delta T_H about the heaviest muon neutrino mass and T_H about proton mass gives 2.12\times 10-5 which agrees with the recent OPERA experiments. \\ ( http://arxiv.org/abs/1109.6298 , 86kb) ------------------------------------------------------------------------------ \\ arXiv:1109.6301 (*cross-listing*) Date: Wed, 28 Sep 2011 19:10:53 GMT (9kb) Title: Electrodynamics in a Background Chiral Field Authors: F.T. Brandt, D.G.C. McKeon and A. Patrushev Categories: hep-th hep-ph Comments: 9 pages \\ We consider the one loop effective action in four dimensional Euclidean space for a background chiral field coupled to a spinor field. It proves possible to find an exact expression for this action if the mass $m$ of the spinor vanishes. If $m$ does not vanish, one can make a perturbative expansion in powers of the axial field that contributes to the chiral field, while treating the contribution of the vector field exactly when it is a constant. The analogous problem in two dimensions is also discussed. \\ ( http://arxiv.org/abs/1109.6301 , 9kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:1010.3110 replaced with revised version Wed, 28 Sep 2011 14:19:03 GMT (79kb) Title: Investigation of heavy-heavy pseudoscalar mesons in thermal QCD Sum Rules Authors: E. Veli Veliev, K. Azizi, H. Sundu, N. Aksit Categories: hep-ph Comments: 11 Pages, 2 Tables and 6 Figures \\ ( http://arxiv.org/abs/1010.3110 , 79kb) ------------------------------------------------------------------------------ \\ arXiv:1011.6362 replaced with revised version Wed, 28 Sep 2011 02:06:34 GMT (343kb) Title: Leptogenesis at the Electroweak Scale Authors: Boris Kayser and Gino Segre Categories: hep-ph hep-th Comments: 10 pages, 3 figures Report-no: FERMILAB-PUB-10-431-T \\ ( http://arxiv.org/abs/1011.6362 , 343kb) ------------------------------------------------------------------------------ \\ arXiv:1101.6012 replaced with revised version Wed, 28 Sep 2011 08:12:48 GMT (102kb,D) Title: Negative Binomial Distribution and the multiplicity moments at the LHC Authors: Michal Praszalowicz Categories: hep-ph Comments: 10 pages, 3 figures. Version accepted in Phys. Lett. B. Comments concerning mdels of multiparticle production and some references added \\ ( http://arxiv.org/abs/1101.6012 , 102kb) ------------------------------------------------------------------------------ \\ arXiv:1103.4333 replaced with revised version Wed, 28 Sep 2011 06:56:53 GMT (549kb,D) Title: Shear viscosity, cavitation and hydrodynamics at LHC Authors: Jitesh R. Bhatt, Hiranmaya Mishra and V. Sreekanth Categories: hep-ph nucl-th Comments: 5 pages, 5 figures, to appear in Phys. Lett. B \\ ( http://arxiv.org/abs/1103.4333 , 549kb) ------------------------------------------------------------------------------ \\ arXiv:1103.5015 replaced with revised version Wed, 28 Sep 2011 11:38:32 GMT (138kb,D) Title: On the inclusion of the QCD NLO corrections in the quark--gluon Monte Carlo shower Authors: S. Jadach, A. Kusina, W. P{\l}aczek, M. Skrzypek, M. Slawinska Categories: hep-ph Comments: 52 pages, 6 figures Report-no: IFJPAN-IV-2011-2, CERN-PH-TH/2011-034 \\ ( http://arxiv.org/abs/1103.5015 , 138kb) ------------------------------------------------------------------------------ \\ arXiv:1104.1168 (*cross-listing*) replaced with revised version Wed, 28 Sep 2011 17:41:41 GMT (11kb) Title: Longitudinal Rescaling of Quantum Electrodynamics Authors: Axel Cortes Cubero and Peter Orland Categories: hep-th hep-ph nucl-th Comments: Version to appear in Phys. Rev. D \\ ( http://arxiv.org/abs/1104.1168 , 11kb) ------------------------------------------------------------------------------ \\ arXiv:1106.1932 replaced with revised version Wed, 28 Sep 2011 13:35:31 GMT (1731kb) Title: Discrimination of New Physics Models with the International Linear Collider Authors: Masaki Asano, Tomoyuki Saito, Taikan Suehara, Keisuke Fujii, R. S. Hundi, Hideo Itoh, Shigeki Matsumoto, Nobuchika Okada, Yosuke Takubo, and Hitoshi Yamamoto Categories: hep-ph Comments: 30 pages, 9 figures, submitted to Physical Review D Report-no: KEK Preprint 2010-54, IPMU11-0012, TU-875, UT-11-18 \\ ( http://arxiv.org/abs/1106.1932 , 1731kb) ------------------------------------------------------------------------------ \\ arXiv:1106.3855 replaced with revised version Wed, 28 Sep 2011 11:30:02 GMT (338kb) Title: Axial anomaly and mixing: from real to highly virtual photons Authors: Yaroslav N. Klopot, Armen G. Oganesian and Oleg V. Teryaev Categories: hep-ph Comments: 10 pages, 4 figures. Minor corrections, references added and updated; to appear in Phys.Rev.D \\ ( http://arxiv.org/abs/1106.3855 , 338kb) ------------------------------------------------------------------------------ \\ arXiv:1106.4365 replaced with revised version Tue, 27 Sep 2011 22:25:58 GMT (42kb) Title: Constraints on the Light Pseudoscalar Meson Distribution Amplitudes from Their Meson-Photon Transition Form Factors Authors: Xing-Gang Wu and Tao Huang Categories: hep-ph Comments: 18 pages, 8 figures and 1 table. Reference updated. To be published in Phys.Rev.D \\ ( http://arxiv.org/abs/1106.4365 , 42kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5740 replaced with revised version Wed, 28 Sep 2011 00:57:03 GMT (182kb) Title: Small x nonlinear evolution with impact parameter and the structure function data Authors: Jeffrey Berger and Anna M. Stasto Categories: hep-ph Comments: 19 pages, 11 figures. Major revision. Changes in Secs.I-V, 4 new figures; plots with F2 structure function replaced \\ ( http://arxiv.org/abs/1106.5740 , 182kb) ------------------------------------------------------------------------------ \\ arXiv:1107.3713 replaced with revised version Wed, 28 Sep 2011 12:12:37 GMT (153kb) Title: Baryogenesis by B - L generation due to superheavy particle decay Authors: Seishi Enomoto and Nobuhiro Maekawa Categories: hep-ph Comments: 12 pages, 4 figures, 3 tables \\ ( http://arxiv.org/abs/1107.3713 , 153kb) ------------------------------------------------------------------------------ \\ arXiv:1107.4003 (*cross-listing*) replaced with revised version Tue, 27 Sep 2011 20:52:09 GMT (708kb) Title: Selected highlights from the study of mesons Authors: Lei Chang, Craig D. Roberts and Peter C. Tandy Categories: nucl-th hep-lat hep-ph nucl-ex Comments: 28 pages, 15 figures, 2 tables. Version to appear in the Chinese Journal of Physics \\ ( http://arxiv.org/abs/1107.4003 , 708kb) ------------------------------------------------------------------------------ \\ arXiv:1108.4136 (*cross-listing*) replaced with revised version Wed, 28 Sep 2011 10:24:40 GMT (68kb,D) Title: Sterile neutrinos with eV masses in cosmology -- how disfavoured exactly? Authors: Jan Hamann, Steen Hannestad, Georg G. Raffelt, Yvonne Y.Y. Wong Categories: astro-ph.CO hep-ph Comments: 14 pages, 6 figures, v2: minor changes, matches version accepted for publication in JCAP Report-no: MPP-2011-100, TTK-11-29 \\ ( http://arxiv.org/abs/1108.4136 , 68kb) ------------------------------------------------------------------------------ \\ arXiv:1108.6129 (*cross-listing*) replaced with revised version Wed, 28 Sep 2011 18:02:43 GMT (525kb) Title: Rare dileptonic decays of \Lambda_b in a quark model Authors: Lonnie Mott and Winston Roberts Categories: nucl-th hep-ex hep-ph nucl-ex Comments: Updated info on experimental status and updated references \\ ( http://arxiv.org/abs/1108.6129 , 525kb) ------------------------------------------------------------------------------ \\ arXiv:1109.0058 (*cross-listing*) replaced with revised version Wed, 28 Sep 2011 09:19:06 GMT (26kb) Title: Wilson Loops @ 3-Loops in Special Kinematics Authors: Paul Heslop and Valentin V. Khoze Categories: hep-th hep-ph Comments: 26 pages. Typos corrected Report-no: IPPP/11/49, DCPT/11/98 \\ ( http://arxiv.org/abs/1109.0058 , 26kb) ------------------------------------------------------------------------------ \\ arXiv:1109.2718 replaced with revised version Wed, 28 Sep 2011 10:35:17 GMT (545kb) Title: Pion-photon transition form factor. Living on the QCD frontier Authors: N. G. Stefanis Categories: hep-ph hep-ex Comments: 6 pages, 3 figures; needs style files svglov2.clo, svjour2.cls (supplied). Presented at LIGHTCONE 2011, 23 - 27 May, 2011, Dallas, USA. Accepted for publication in Few-Body Systems. In v2 name of second author in [28] corrected. V3 is final version, published online 23. Sep 2011 Report-no: RUB-TPII-06/2011 DOI: 10.1007/s00601-011-0257-2 \\ ( http://arxiv.org/abs/1109.2718 , 545kb) ------------------------------------------------------------------------------ \\ arXiv:1109.3787 replaced with revised version Wed, 28 Sep 2011 18:00:45 GMT (12kb) Title: On the Classification of Accidental Symmetries of the Two Higgs Doublet Model Potential Authors: Apostolos Pilaftsis Categories: hep-ph Comments: 10 pages, clarifications pertinent to Table 2 included and two references added Report-no: MAN/HEP/2011/14, FTUV-11-1909 \\ ( http://arxiv.org/abs/1109.3787 , 12kb) ------------------------------------------------------------------------------ \\ arXiv:1109.5445 replaced with revised version Wed, 28 Sep 2011 07:37:52 GMT (11kb) Title: Apparent Lorentz violation with superluminal Majorana neutrinos at OPERA? Authors: F. Tamburini (1) and M. Laveder (2), ((1) Department of Astronomy, University of Padova, Padova, Italy (2) Department of Physics, University of Padova, Padova, Italy) Categories: hep-ph astro-ph.HE quant-ph Comments: 4 pages \\ ( http://arxiv.org/abs/1109.5445 , 11kb) ------------------------------------------------------------------------------ \\ arXiv:1109.5671 replaced with revised version Wed, 28 Sep 2011 19:08:13 GMT (7kb) Title: OPERA's superluminal muon-neutrino velocity and a Fermi-point-splitting model of Lorentz violation Authors: F.R. Klinkhamer Categories: hep-ph hep-ex Comments: 6 pages, v2: minor changes, two added references Report-no: KA-TP-26-2011 \\ ( http://arxiv.org/abs/1109.5671 , 7kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- For subscribe options to combined physics archives, e-mail To: physics@arXiv.org, Subject: subscribe ----------------------------------------------------------------------------- For help on viewing and making submissions, see http://arXiv.org/help/ For a list of archive mirror sites, see http://arXiv.org/servers.html ----------------------------------------------------------------------------- Third-party submissions cause excessive problems. Author self-submissions are exceedingly preferred. E-mail submissions have been discontinued in favor of better support for Web submissions. See http://arXiv.org/help/uploads