Date: Thu, 29 Jul 10 00:05:07 GMT Subject: hep-ph daily 21 new + 10 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 Jul 10 20:00:00 GMT to Wed 28 Jul 10 20:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:1007.4807 Date: Tue, 27 Jul 2010 20:00:02 GMT (1597kb,D) Title: T-parity, its problems and their solution Authors: Duccio Pappadopulo and Alessandro Vichi Categories: hep-ph Comments: 25 pages, 2 appendices \\ We point out a basic difficulty in the construction of little-Higgs models with T-parity which is overlooked by large part of the present literature. Almost all models proposed so far fail to achieve their goal: they either suffer from sizable electroweak corrections or from a breakdown of collective breaking. We provide a model building recipe to bypass the above problem and apply it to build the simplest T-invariant extension of the Littlest Higgs. Our model predicts additional T-odd pseudo-Goldstone bosons with weak scale masses. \\ ( http://arxiv.org/abs/1007.4807 , 1597kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4812 Date: Tue, 27 Jul 2010 20:03:25 GMT (57kb) Title: Exploring SUSY light Higgs boson scenarios via dark matter experiments Authors: Debottam Das, Andreas Goudelis, Yann Mambrini Categories: hep-ph astro-ph.CO astro-ph.HE Comments: 28 pages, 3 figures Report-no: LPT-10-52 \\ We examine the dark matter phenomenology in supersymmetric light higgs boson scenarios, adapting nonuniversal Higgs masses at the gauge coupling unification scale. The correct relic density is obtained mostly through the annihilation into a pseudoscalar $A$, which gives high values for the self-annihilation cross-section at present times. Our analysis shows that most part of the $A$ pole region can produce detectable gamma-rays and antiproton signals, and still be compatible with with recent direct detection data from XENON100 and CDMS-II. \\ ( http://arxiv.org/abs/1007.4812 , 57kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4833 Date: Tue, 27 Jul 2010 21:48:30 GMT (1212kb) Title: Interplay of LFV and slepton mass splittings at the LHC as a probe of the SUSY seesaw Authors: A. Abada, A. J. R. Figueiredo, J. C. Romao and A. M. Teixeira Categories: hep-ph Comments: 50 pages, 42 eps Figures Report-no: LPT Orsay 10-48, CFTP 10-010 and PCCF RI 1003 \\ We study the impact of a type-I SUSY seesaw concerning lepton flavour violation (LFV) both at low-energies and at the LHC. The study of the di-lepton invariant mass distribution at the LHC allows to reconstruct some of the masses of the different sparticles involved in a decay chain. In particular, the combination with other observables renders feasible the reconstruction of the masses of the intermediate sleptons involved in $ \chi_2^0\to \tilde \ell \,\ell \to \ell \,\ell\,\chi_1^0$ decays. Slepton mass splittings can be either interpreted as a signal of non-universality in the SUSY soft breaking-terms (signalling a deviation from constrained scenarios as the cMSSM) or as being due to the violation of lepton flavour. In the latter case, in addition to these high-energy processes, one expects further low-energy manifestations of LFV such as radiative and three-body lepton decays. Under the assumption of a type-I seesaw as the source of neutrino masses and mixings, all these LFV observables are related. Working in the framework of the cMSSM extended by three right-handed neutrino superfields, we conduct a systematic analysis addressing the simultaneous implications of the SUSY seesaw for both high- and low-energy lepton flavour violation. We discuss how the confrontation of slepton mass splittings as observed at the LHC and low-energy LFV observables may provide important information about the underlying mechanism of LFV. \\ ( http://arxiv.org/abs/1007.4833 , 1212kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4839 Date: Tue, 27 Jul 2010 22:23:32 GMT (567kb) Title: Mixed dark matter from technicolor Authors: Alexander Belyaev, Mads T. Frandsen, Subir Sarkar, Francesco Sannino Categories: hep-ph hep-ex hep-lat Comments: LaTeX, 9 pages, 8 figures \\ We study natural composite cold dark matter candidates which are pseudo Nambu-Goldstone bosons (pNGB) in models of dynamical electroweak symmetry breaking. Some of these can have a significant thermal relic abundance, while others must be mainly asymmetric dark matter. By considering the thermal abundance alone we find a lower bound of MW on the pNGB mass when the (composite) Higgs is heavier than 115 GeV. Being pNGBs, the dark matter candidates are in general light enough to be produced at the LHC. \\ ( http://arxiv.org/abs/1007.4839 , 567kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4841 Date: Tue, 27 Jul 2010 23:03:28 GMT (7kb) Title: The photon magnetic moment has not a perpendicular component and is fully paramagnetic Authors: H. Perez Rojas and E. Rodriguez Querts Categories: hep-ph \\ Our paper Phys. Rev. D \textbf{79}, 093002 (2009), in which it was shown the paramagnetic behavior of photons propagating in magnetized vacuum, is criticized and even claimed that the photon has a diamagnetic component in Phys. Rev. D \textbf{81}, 105019, (2010). Here it is shown that the alleged "perpendicular component" is due to a mistake in differentiating a vanishing term with regard to the magnetic field $B$. A discussion on the physical side of the problem is made also. \\ ( http://arxiv.org/abs/1007.4841 , 7kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4865 Date: Wed, 28 Jul 2010 03:23:54 GMT (1772kb) Title: Semileptonic B to Scalar meson Decays in the Standard Model with Fourth Generation Authors: M. Jamil Aslam Categories: hep-ph Comments: 14 pages, 6 figures \\ We study the effects of the fourth generation of quarks on the total branching ratio and the lepton polarizations in $\bar{B}_{0}\rightarrow K_{0}^{\ast}(1430)l^{+}l^{-}$($l$ = $\mu $, $\tau $) decay. Taking fourth generation quark mass $m_{t{\prime}}$ of about $400$ to $600$ GeV with the mixing angle $\left\vert V_{t^{\prime}b}^{\ast}V_{t^{\prime}s}\right\vert $ in the range $(0.05-1.4)\times 10^{-2}$ and using the phase to be $80^{o}$%, it is found that the branching ratio and lepton polarizations are quite sensitive to these fourth generation parameters. In future the experimental study of this decay will give us an opportunity to study new physics effects, precisely, to search for the fourth generation of quarks $% (t^{\prime},b^{\prime})$ in an indirect way. \\ ( http://arxiv.org/abs/1007.4865 , 1772kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4907 Date: Wed, 28 Jul 2010 09:23:15 GMT (6kb) Title: A five-dimensional effective model for excited light mesons Authors: S.S. Afonin Categories: hep-ph Comments: 4 pages, to appear in the proceedings of MENU2010 \\ In the usual holographic approach to QCD, the meson spectrum is generated due to a non-trivial 5-dimensional background. We propose an alternative 5-dimensional scenario in which the spectrum emerges due to coupling to a scalar field whose condensation is supposed to be dual to the formation of gluon condensate and mimics the scale anomaly in QCD. The spectrum of model has finite number of discrete states plus continuum and reveals a Regge-like behavior in the strong coupling regime. \\ ( http://arxiv.org/abs/1007.4907 , 6kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4914 Date: Wed, 28 Jul 2010 09:59:29 GMT (135kb) Title: Quantum radiation reaction effects in multiphoton Compton scattering Authors: A. Di Piazza, K. Z. Hatsagortsyan, and C. H. Keitel Categories: hep-ph Comments: 5 pages, 2 figures \\ Radiation reaction effects in the interaction of an electron and a strong laser field are investigated in the realm of quantum electrodynamics. We identify quantum radiation reaction with the multiple photon recoils experienced by the laser-driven electron due to consecutive incoherent photon emissions. After determining a quantum radiation dominated regime, we demonstrate how in this regime quantum signatures of radiation reaction strongly affect multiphoton Compton scattering spectra and that they could be measurable in principle with presently available laser technology. \\ ( http://arxiv.org/abs/1007.4914 , 135kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4918 Date: Wed, 28 Jul 2010 10:21:40 GMT (24kb) Title: NLO QCD calculations with HELAC-NLO Authors: G. Bevilacqua, M. Czakon, M. V. Garzelli, A. van Hameren, Y. Malamos, C. G. Papadopoulos, R. Pittau and M. Worek Categories: hep-ph Comments: 7 pages, 4 figures. Presented at 10th DESY Workshop on Elementary Particle Theory: Loops and Legs in Quantum Field Theory, Worlitz, Germany, April 25-30, 2010 Report-no: WUB/10-16 \\ Achieving a precise description of multi-parton final states is crucial for many analyses at LHC. In this contribution we review the main features of the HELAC-NLO system for NLO QCD calculations. As a case study, NLO QCD corrections for tt + 2 jet production at LHC are illustrated and discussed. \\ ( http://arxiv.org/abs/1007.4918 , 24kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4956 Date: Wed, 28 Jul 2010 13:11:57 GMT (19kb) Title: New experiments with antiprotons Authors: Daniel M. Kaplan (for the AGE and P-986 collaborations) Categories: hep-ph hep-ex physics.atom-ph Comments: 5 pages. Presented at the Fifth Meeting on CPT and Lorentz Symmetry, Bloomington, Indiana, June 28-July 2, 2010 Report-no: IIT-CAPP-10-05 \\ Fermilab operates the world's most intense antiproton source. Recently proposed experiments can use those antiprotons either parasitically during Tevatron Collider running or after the Tevatron Collider finishes in about 2011. For example, the annihilation of 8 GeV antiprotons might make the world's most intense source of tagged D^0 mesons, and thus the best near-term opportunity to study charm mixing and search for new physics via its CP-violation signature. Other possible precision measurements include properties of the X(3872) and the charmonium system. An experiment using a Penning trap and an atom interferometer could make the world's first measurement of the gravitational force on antimatter. These and other potential measurements using antiprotons could yield a broad physics program at Fermilab in the post-Tevatron era. \\ ( http://arxiv.org/abs/1007.4956 , 19kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4960 Date: Wed, 28 Jul 2010 13:26:39 GMT (703kb) Title: Transversity form factors of the pion in chiral quark models Authors: Wojciech Broniowski, Alexander E. Dorokhov, Enrique Ruiz Arriola Categories: hep-ph Comments: 5 pages, 7 figures \\ The transversity form factors of the pion, involving matrix elements of bilocal tensor currents, are evaluated in chiral quark models, both in the local Nambu--Jona-Lasinio with the Pauli-Villars regularization, as well as in nonlocal models involving momentum-dependent quark mass. After suitable QCD evolution the agreement with recent lattice calculations is very good, in accordance to the fact that the spontaneously broken chiral symmetry governs the dynamics of the pion. Meson dominance of form factors with expected meson masses also works properly, conforming to the parton-hadron duality in the considered process. \\ ( http://arxiv.org/abs/1007.4960 , 703kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4984 Date: Wed, 28 Jul 2010 14:09:58 GMT (108kb) Title: Radiative Events as a Probe of Dark Forces at GeV-Scale e+ e- Colliders Authors: L. Barze', G. Balossini, C. Bignamini, C.M. Carloni Calame, G. Montagna, O. Nicrosini and F. Piccinini Categories: hep-ph hep-ex Comments: 6 pages, 5 figures Report-no: FNT/T 2010/01 \\ High-luminosity e+ e- colliders at the GeV scale (flavor factories) have been recently recognized to be an ideal environment to search for a light weakly coupled vector boson U (dark photon) emerging in several new physics models able to interpret anomalous astrophysical observations in terms of dark matter. At flavor factories a particularly clean channel is the production of the U boson in association with a photon, followed by the decay of the U boson into lepton pairs. Beyond the approximations addressed in previous works, we revisit the reach potential of this channel by performing an exact lowest-order calculation of the signal and background processes. We also include the effect of initial and final state QED corrections neglected so far, to show how they affect the distributions of experimental interest. We present new results for the expected statistical significance to a dark photon signal at KLOE/KLOE-2 and future super-B factories. The calculation is implemented in a new release of the event generator BabaYaga@NLO, which is available for full event simulations and data analysis. \\ ( http://arxiv.org/abs/1007.4984 , 108kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4989 Date: Wed, 28 Jul 2010 14:25:24 GMT (18kb) Title: Secondary atmospheric tau neutrino production Authors: Alexander Bulmahn and Mary Hall Reno Categories: hep-ph Comments: 4 pages, 2 figures \\ We evaluate the flux of tau neutrinos produced from the decay of pair produced taus from incident muons using a cascade equation analysis. To solve the cascade equations, our numerical result for the tau production $Z$ moment is given. Our results for the flux of tau neutrinos produced from incident muons are compared to the flux of tau neutrinos produced via oscillations and the direct prompt atmospheric tau neutrino flux. Results are given for both downward and upward going neutrinos fluxes and higher zenith angles are discussed. We conclude that the direct prompt atmospheric tau neutrino flux dominates these other atmospheric sources of tau neutrinos for neutrino energies larger than a few TeV for upward fluxes, and over a wider range of energy for downward fluxes. \\ ( http://arxiv.org/abs/1007.4989 , 18kb) ------------------------------------------------------------------------------ \\ arXiv:1007.5001 Date: Wed, 28 Jul 2010 15:04:18 GMT (5450kb,D) Title: Simulation of Z(3) walls and string production via bubble nucleation in a quark-hadron transition Authors: Uma Shankar Gupta, Ranjita K. Mohapatra, Ajit M. Srivastava and Vivek K. Tiwari Categories: hep-ph Comments: 23 pages and 12 figures \\ We study the dynamics of confinement-deconfinement (C-D) phase transition in the context of relativistic heavy-ion collisions within the framework of effective models for the Polyakov loop order parameter. We study the formation of $Z(3)$ walls and associated strings in the initial transition from the confining (hadronic) phase to the deconfining (QGP) phase via the so called Kibble mechanism. Essential physics of the Kibble mechanism is contained in a sort of domain structure arising after any phase transition which represents random variation of the order parameter at distances beyond the typical correlation length. We implement this domain structure by using the Polyakov loop effective model with a first order phase transition and confine ourselves with temperature/time ranges so that the first order C-D transition proceeds via bubble nucleation, leading to a well defined domain structure. The formation of $Z(3)$ walls and associated strings results from the coalescence of QGP bubbles expanding in the confining background. We investigate the evolution of the $Z(3)$ wall and string network. We also calculate the energy density fluctuations associated with $Z(3)$ wall network and strings which decay away after the temperature drops below the quark-hadron transition temperature during the expansion of QGP. We discuss evolution of these quantities with changing temperature via Bjorken's hydrodynamical model and discuss possible experimental signatures resulting from the presence of $Z(3)$ wall network and associate strings. \\ ( http://arxiv.org/abs/1007.5001 , 5450kb) ------------------------------------------------------------------------------ \\ arXiv:1007.5007 Date: Wed, 28 Jul 2010 15:31:05 GMT (198kb) Title: Broken R-Parity in the Sky and at the LHC Authors: Sergei Bobrovskyi, Wilfried Buchmuller, Jan Hajer, Jonas Schmidt Categories: hep-ph Comments: 30 pages, 8 figures Report-no: DESY 10-068 \\ Supersymmetric extensions of the Standard Model with small R-parity and lepton number violating couplings are naturally consistent with primordial nucleosynthesis, thermal leptogenesis and gravitino dark matter. We consider supergravity models with universal boundary conditions at the grand unification scale, and scalar tau-lepton or bino-like neutralino as next-to-lightest superparticle (NLSP). Recent Fermi-LAT data on the isotropic diffuse gamma-ray flux yield a lower bound on the gravitino lifetime. Comparing two-body gravitino and neutralino decays we find a lower bound on a neutralino NLSP decay length, $c \tau_{\chi^0_1} \gsim 30 cm$. Together with gravitino and neutralino masses one obtains a microscopic determination of the Planck mass. For a stau-NLSP there exists no model-independent lower bound on the decay length. Here the strongest bound comes from the requirement that the cosmological baryon asymmetry is not washed out, which yields $c \tau_{\tilde\tau_1} \gsim 4 mm$. However, without fine-tuning of parameters, one finds much larger decay lengths. For typical masses, $m_{3/2} \sim 100 GeV$ and $m_{NLSP} \sim 150 GeV$, the discovery of a photon line with an intensity close to the Fermi-LAT limit would imply a decay length $c\tau_{NLSP}$ of several hundred meters, which can be measured at the LHC. \\ ( http://arxiv.org/abs/1007.5007 , 198kb) ------------------------------------------------------------------------------ \\ arXiv:1007.5008 Date: Wed, 28 Jul 2010 15:31:17 GMT (127kb) Title: Constraints on Possible Monopole-Dipole Interactions of WISPs from the Transverse Relaxation Time of Polarized $^3$He Gas Authors: Changbo Fu, Thomas R. Gentile, and William M. Snow Categories: hep-ph Comments: Presented at the Fifth Meeting on CPT and Lorentz Symmetry, Bloomington, Indiana, June 28-July 2, 2010 \\ Various theories beyond the Standard Model predict new particles with masses in the sub-eV range with very weak couplings to ordinary matter. A $P$-odd, $T$-odd, spin-dependent interaction between polarized and unpolarized matter is one such possibility. Such a monopole-dipole interaction can be induced by the exchange of spin-$0$ particles. The presence of a possible monopole-dipole interaction between fermion spins and unpolarized matter would cause an decreased transverse spin relaxation time $T_{2}$ for a confined gas of polarized nuclei. By reanalyzing previously existing data on the spin relaxation times of polarized $^3$He in gas cells with pressure in the millibar range and applying the well-established theory of spin relaxation for magnetic field gradients to gradients in a possible monopole-dipole field, we present new laboratory constraints on the strength and range of such an interaction. These constraints represent to our knowledge the best limits on such interactions for the neutron with ranges between $0.01$ cm and 1 cm. \\ ( http://arxiv.org/abs/1007.5008 , 127kb) ------------------------------------------------------------------------------ \\ arXiv:1007.5021 Date: Wed, 28 Jul 2010 16:12:33 GMT (25kb) Title: Introduction to the Physics of Saturation Authors: Yuri V. Kovchegov Categories: hep-ph nucl-ex Comments: 10 pages, 5 figures, based on the talk given at the RIKEN BNL Research Center Workshop on "Saturation, the Color Glass Condensate and Glasma: What Have we Learned from RHIC?" on May 10, 2010 \\ We present a brief introduction to the physics of parton saturation/Color Glass Condensate (CGC). \\ ( http://arxiv.org/abs/1007.5021 , 25kb) ------------------------------------------------------------------------------ \\ arXiv:1007.5023 Date: Wed, 28 Jul 2010 16:13:49 GMT (139kb) Title: Tools for Dark Matter in Particle and Astroparticle Physics Authors: Alexander Pukhov, Genevieve Belanger, Fawzi Boudjema, Andrei Semenov Categories: hep-ph Comments: 10 pages, 2 figures, to appear in the Proceedings of 13th International Workshop on Advanced Computing and Analysis Techniques in Physics Research, February 2010, Jaipur, India \\ Despite several indirect confirmations of the existence of dark matter, the properties of a new dark matter particle are still largely unknown. Several experiments are currently searching for this particle underground in direct detection, in space and on earth in indirect detection and at the LHC. A confirmed signal could select a model for dark matter among the many extensions of the standard model. In this paper we present a short review of the public codes for computation of dark matter observables. \\ ( http://arxiv.org/abs/1007.5023 , 139kb) ------------------------------------------------------------------------------ \\ arXiv:1007.5049 Date: Wed, 28 Jul 2010 19:14:27 GMT (16kb) Title: Gauge non-invariance as tests of emergent gauge symmetry Authors: John F. Donoghue, Mohamed Anber and Ufuk Aydemir Categories: hep-ph gr-qc hep-th Comments: 5 pages, Invited talk presented at the Fifth Meeting on CPT and Lorentz Symmetry, Bloomington, Indiana, June 28-July 2, 2010 \\ We motivate the concept of emergent gauge symmetry and discuss ways that this concept can be tested. The key idea is that if a symmetry is emergent, one should look for small violations of this symmetry because the underlying fundamental theory does not contain the symmetry. We describe our recent work implementing this idea in the gravity sector. We also describe the reasons why violations of gauge symmetry may well be linked to violations of Lorentz invariance. \\ ( http://arxiv.org/abs/1007.5049 , 16kb) ------------------------------------------------------------------------------ \\ arXiv:1007.5053 Date: Wed, 28 Jul 2010 19:40:45 GMT (256kb) Title: Color Diagrams for Non Vacuum Reggeons in Hadron-Hadron Interactions Authors: V. A. Abramovsky, N. V. Radchenko Categories: hep-ph Comments: 9 pages, 13 figures \\ One-to-one correspondence between dual diagrams of dual resonance model and QCD based color diagrams describing non vacuum exchanges in pi+ pi-, pi+- p, p anti p interactions is discussed. Both for dual and color diagrams there are state with quark-antiquark in t channel and state, in which only coherent quark string exists, in s channel. There are no such dual diagrams in pp interaction. Color diagram for pp interaction was found basing on principle of conformity. Secondary hadrons spectrum, obtained from this diagram, has nucleon in its central region. This effect may lead to increase of baryon chemical potential in nucleus-nucleus collisions in facilities NICA and FAIR. \\ ( http://arxiv.org/abs/1007.5053 , 256kb) ------------------------------------------------------------------------------ \\ arXiv:1007.5054 Date: Wed, 28 Jul 2010 19:53:10 GMT (11kb) Title: Nuclear Physics in a Susy Universe Authors: L. Clavelli and I. Perevalova Categories: hep-ph hep-th Comments: 8 pages, 1 figure \\ We refine a previous zeroth order analysis of the nuclear properties of a supersymmetric (susy) universe with standard model particle content plus degenerate susy partners. No assumptions are made concerning the Higgs structure except we assume that the degenerate fermion/sfermion masses are non-zero. This alternate universe has been dubbed Susyria and it has been proposed that such a world may exist with zero vacuum energy in the string landscape. \\ ( http://arxiv.org/abs/1007.5054 , 11kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:1007.3549 (*cross-listing*) Date: Wed, 21 Jul 2010 01:36:48 GMT (202kb) Date (revised v2): Tue, 27 Jul 2010 23:59:05 GMT (202kb) Title: A coherent understanding of low-energy nuclear recoils in liquid xenon Authors: Peter Sorensen Categories: astro-ph.IM hep-ph physics.ins-det Comments: 19 pages, 10 figures, minor revisions \\ Liquid xenon detectors such as XENON10 and XENON100 obtain a significant fraction of their sensitivity to light (<10 GeV) particle dark matter by looking for nuclear recoils of only a few keV, just above the detector threshold. Yet in this energy regime a correct treatment of the detector threshold and resolution remains unclear. The energy dependence of the scintillation yield of liquid xenon for nuclear recoils also bears heavily on detector sensitivity, yet numerous measurements have not succeeded in obtaining concordant results. In this article we show that the ratio of detected ionization to scintillation can be leveraged to constrain the scintillation yield. We also present a rigorous treatment of liquid xenon detector threshold and energy resolution. Notably, the effective energy resolution differs significantly from a simple Poisson distribution. We conclude with a calculation of dark matter exclusion limits, and show that existing data from liquid xenon detectors strongly constrain recent interpretations of light dark matter. \\ ( http://arxiv.org/abs/1007.3549 , 202kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4277 (*cross-listing*) Date: Sat, 24 Jul 2010 17:08:11 GMT (305kb) Title: Scale-dependent non-Gaussianity probes inflationary physics Authors: Christian T. Byrnes, Mischa Gerstenlauer, Sami Nurmi, Gianmassimo Tasinato, David Wands Categories: astro-ph.CO hep-ph hep-th Comments: 27 pages, 2 figures \\ We calculate the scale dependence of the bispectrum and trispectrum in (quasi) local models of non-Gaussian primordial density perturbations, and characterize this scale dependence in terms of new observable parameters. They can help to discriminate between models of inflation, since they are sensitive to properties of the inflationary physics that are not probed by the standard observables. We find consistency relations between these parameters in certain classes of models. We apply our results to a scenario of modulated reheating, showing that the scale dependence of non-Gaussianity can be significant. We also discuss the scale dependence of the bispectrum and trispectrum, in cases where one varies the shape as well as the overall scale of the figure under consideration. We conclude providing a formulation of the curvature perturbation in real space, which generalises the standard local form by dropping the assumption that f_NL and g_NL are constants. \\ ( http://arxiv.org/abs/1007.4277 , 305kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4710 (*cross-listing*) Date: Tue, 27 Jul 2010 13:19:52 GMT (24kb) Title: Recent results and perspectives on cosmic rays ground experiments Authors: Ofelia Pisanti Categories: astro-ph.HE astro-ph.IM hep-ph Comments: 5 pages, proceedings of IFAE2010 \\ I summarize in this paper the results and perspectives of representative ground experiments for the observation of very high energy cosmic rays. \\ ( http://arxiv.org/abs/1007.4710 , 24kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4829 (*cross-listing*) Date: Tue, 27 Jul 2010 21:30:52 GMT (53kb) Title: New Phenomena in NC Field Theory and Emergent Spacetime Geometry Authors: Badis Ydri Categories: hep-th gr-qc hep-lat hep-ph Comments: 16 pages,7 figures, a contribution to the Constantine workshop on Astronomy and Astrophysics, june 2010 \\ We give a brief review of two nonperturbative phenomena typical of noncommutative field theory which are known to lead to the perturbative instability known as the UV-IR mixing. The first phenomena concerns the emergence/evaporation of spacetime geometry in matrix models which describe perturbative noncommutative gauge theory on fuzzy backgrounds. In particular we show that the transition from a geometrical background to a matrix phase makes the description of noncommutative gauge theory in terms of fields via the Weyl map only valid below a critical value g_*. The second phenomena concerns the appearance of a nonuniform ordered phase in noncommutative scalar \phi^4 field theory and the spontaneous symmetry breaking of translational/rotational invariance which happens even in two dimensions. We argue that this phenomena also originates in the underlying matrix degrees of freedom of the noncommutative field theory. Furthermore it is conjectured that in addition to the usual WF fixed point at $\theta=0$ there must exist a novel fixed point at \theta=\infty corresponding to the quartic hermitian matrix model. \\ ( http://arxiv.org/abs/1007.4829 , 53kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4862 (*cross-listing*) Date: Wed, 28 Jul 2010 02:41:22 GMT (238kb) Title: No Indications of Axion-Like Particles From Fermi Authors: Alexander V. Belikov, Lisa Goodenough, Dan Hooper Categories: astro-ph.HE hep-ph Comments: 7 pages, 4 figures \\ As very high energy (~100 GeV) gamma rays travel over cosmological distances, their flux is attenuated through interactions with the extragalactic background light. Observations of distant gamma ray sources at energies between ~200 GeV and a few TeV by ground-based gamma ray telescopes such as HESS, however, suggest that the universe is more transparent to very high energy photons than had been anticipated. One possible explanation for this is the existence of axion-like-particles (ALPs) which gamma rays can efficiently oscillate into, enabling them to travel cosmological distances without attenuation. In this article, we use data from the Fermi Gamma Ray Space Telescope to calculate the spectra at 1-100 GeV of two gamma ray sources, 1ES1101-232 at redshift z=0.186 and H 2356-309 at z=0.165, and use this in conjunction with the measurements of ground-based telescopes to test the ALP hypothesis. We find that the observations can be well-fit by an intrinsic power-law source spectrum with indices of -2.01 and -2.77 for 1ES1101-232 and H 2356-309, respectively, and that no ALPs or other exotic physics is necessary to explain the observed degree of attenuation. \\ ( http://arxiv.org/abs/1007.4862 , 238kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4881 (*cross-listing*) Date: Wed, 28 Jul 2010 07:19:22 GMT (26kb) Title: N-z Relation and CMB Anisotropies in the Universe with an Oscillating Scalar Field Having a Null Field State Authors: Koichi Hirano, Kiyoshi Kawabata, Zen Komiya, Hiroshi Bunya Categories: astro-ph.CO gr-qc hep-ph hep-th Comments: 2 pages, 3 figures, Proceedings of 59th Yamada Conference "Inflating Horizons of Particle Astrophysics and Cosmology", Universal Academy Press (2006), p.219 \\ We investigate whether or nor it is possible to find a scalar field model or models that are capable of explaining simultaneously the observed $N$-$z$ relation given by the 2dF Galaxy Redshift Survey, which still seems to exhibit a spatial periodicity of the galaxy distribution(the 'picket-fence structure'), and the CMB spectrum obtained by the WMAP experiments. It is found that both the observed size of the spatial periodicity and the amplitude of the 2dF $N$-$z$ relation can be fairly well fitted by the theoretical computations based on the scalar field models with $-20\le \xi\le -10$, and $140\le m_{\rm s} \le 160$, where $\xi$ is the gravitational coupling parameter, and $m_{\rm s}$ the normalized mass of the scalar field, respectively. To reproduce the CMB spectrum of the WMAP, we find that it is very crucial to have a null state of the scalar field in the early epochs of evolution of the universe. \\ ( http://arxiv.org/abs/1007.4881 , 26kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4885 (*cross-listing*) Date: Wed, 28 Jul 2010 07:41:23 GMT (41kb) Title: The vicinity of the phase transition in the lattice Weinberg - Salam Model Authors: M.A.Zubkov Categories: hep-lat hep-ph Comments: Proceedings of QUARKS-2010 \\ We investigated the lattice Weinberg - Salam model without fermions for the Higgs mass around $300$ GeV. On the phase diagram there exists the vicinity of the phase transition between the physical Higgs phase and the unphysical symmetric phase, where the fluctuations of the scalar field become strong while Nambu monopoles are dense. According to our numerical results (obtained on the lattices of sizes up to $20^3\times 24$) the maximal value of the ultraviolet cutoff in the model cannot exceed the value around $1.4$ TeV. \\ ( http://arxiv.org/abs/1007.4885 , 41kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4946 (*cross-listing*) Date: Wed, 28 Jul 2010 12:38:22 GMT (9kb) Title: Lorentz-invariant Bohmian description of inelastic scattering in QFT Authors: H. Nikolic Categories: hep-th hep-ph quant-ph Comments: 11 pages \\ The Lorentz-invariant S-matrix elements in interacting quantum field theory (QFT) are used to represent the QFT state by a Lorentz-invariant many-time wave function. Such a wave function can be used to describe inelastic scattering processes (involving particle creation and destruction) by Bohmian particle trajectories satisfying relativistic-covariant equations of motion. \\ ( http://arxiv.org/abs/1007.4946 , 9kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4949 (*cross-listing*) Date: Wed, 28 Jul 2010 12:45:47 GMT (41kb) Title: Cosmological density perturbations from conformal scalar field: infrared properties and statistical anisotropy Authors: M. Libanov, V. Rubakov Categories: hep-th astro-ph.CO hep-ph Comments: 19 pages, 2 figures Report-no: INR-TH-2010-46 \\ We consider a scenario in which primordial scalar perturbations are generated when complex conformal scalar field rolls down its negative quartic potential. Initially, these are the perturbations of the phase of this field; they are converted into the adiabatic perturbations at a later stage. A potentially dangerous feature of this scenario is the existence of perturbations in the radial field direction, which have red power spectrum. We show, however, that the infrared effects are harmless, as they can be absorbed into field redefinition. We also evaluate the statistical anisotropy inherent in the model due to the existence of the long-ranged radial perturbations. \\ ( http://arxiv.org/abs/1007.4949 , 41kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4979 (*cross-listing*) Date: Wed, 28 Jul 2010 13:54:35 GMT (67kb) Title: $\bar K^*$ meson in nuclear matter Authors: Laura Tolos, Raquel Molina, Eulogio Oset and Angels Ramos Categories: nucl-th hep-ph nucl-ex Comments: 6 pages, 5 figures, talk at International Nuclear Physics Conference 2010 (INPC2010), July 4-9, 2010, Vancouver (Canada) \\ The properties of the $\bar K^*$ meson in dense matter are studied using a unitary approach in coupled channels within the framework of the local hidden gauge formalism. We obtain the $\bar K^*$ spectral function in the nuclear medium and we found that the $\bar K^*$ develops an in-medium width up to five times bigger than in free space. We also estimate the transparency ratio of the $\gamma A \to K^+ K^{*-} A^\prime$ reaction, which we propose as a feasible experimental scenario to detect in-medium modifications of the $\bar K^*$ meson. \\ ( http://arxiv.org/abs/1007.4979 , 67kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:0910.1326 replaced with revised version Wed, 28 Jul 2010 09:15:45 GMT (279kb) Title: Renormalization Invariants and Quark Flavor Mixings Authors: Lu-Xin Liu Categories: hep-ph Comments: 23 pages, 7 figures \\ ( http://arxiv.org/abs/0910.1326 , 279kb) ------------------------------------------------------------------------------ \\ arXiv:0912.5361 replaced with revised version Wed, 28 Jul 2010 04:55:20 GMT (236kb) Title: CDMS II result and Light Higgs Boson Scenario of the MSSM Authors: Masaki Asano, Shigeki Matsumoto, Masato Senami, Hiroaki Sugiyama Categories: hep-ph astro-ph.CO Comments: 9 pages, 5 figures, corrected figures, conclusion unchanged, XENON100 bound superimposed, higher resolution figures can be seen on JHEP Report-no: TU-865 Journal-ref: JHEP 1007:013,2010 DOI: 10.1007/JHEP07(2010)013 \\ ( http://arxiv.org/abs/0912.5361 , 236kb) ------------------------------------------------------------------------------ \\ arXiv:1003.3211 replaced with revised version Tue, 27 Jul 2010 22:37:20 GMT (31kb) Title: Precision Constraints on Extra Fermion Generations Authors: Jens Erler and Paul Langacker Categories: hep-ph hep-ex Comments: 5 pages, 2 figures, minor changes Journal-ref: Phys.Rev.Lett.105:031801,2010 DOI: 10.1103/PhysRevLett.105.031801 \\ ( http://arxiv.org/abs/1003.3211 , 31kb) ------------------------------------------------------------------------------ \\ arXiv:1003.4777 (*cross-listing*) replaced with revised version Wed, 28 Jul 2010 16:03:39 GMT (328kb,D) Title: McVittie's Legacy: Black Holes in an Expanding Universe Authors: Nemanja Kaloper, Matthew Kleban and Damien Martin Categories: hep-th astro-ph.CO gr-qc hep-ph Comments: 23 pages, plain LaTeX, 2 .pdf figures, v3: the finite ingoing time proof improved and generalized, conclusions unchanged Journal-ref: Phys.Rev.D81:104044,2010 DOI: 10.1103/PhysRevD.81.104044 \\ ( http://arxiv.org/abs/1003.4777 , 328kb) ------------------------------------------------------------------------------ \\ arXiv:1004.3982 replaced with revised version Wed, 28 Jul 2010 09:15:37 GMT (213kb,D) Title: A New Strategy for B_s Branching Ratio Measurements and the Search for New Physics in B^0_s -> mu^+ mu^- Authors: Robert Fleischer, Nicola Serra, Niels Tuning Categories: hep-ph hep-ex Comments: 8 pages, 2 figures, extended version, to appear in Physical Review D Report-no: Nikhef-2010-010 \\ ( http://arxiv.org/abs/1004.3982 , 213kb) ------------------------------------------------------------------------------ \\ arXiv:1004.4736 replaced with revised version Wed, 28 Jul 2010 08:15:10 GMT (17kb) Title: Some indication for a missing chiral partner eta_4 around 2 GeV Authors: L. Ya. Glozman and A. Sarantsev Categories: hep-ph hep-ex nucl-ex nucl-th Comments: 4 pp. A fit with the energy-dependent width has been added that agrees with the previous analysis. Accepted by PRD \\ ( http://arxiv.org/abs/1004.4736 , 17kb) ------------------------------------------------------------------------------ \\ arXiv:1005.2755 replaced with revised version Wed, 28 Jul 2010 07:44:09 GMT (134kb) Title: Models and signatures of extra dimensions at the LHC Authors: Marc Besancon Categories: hep-ph hep-ex Comments: 11 pages, 5 figures, to appear in conference proceedings of Rencontres de Moriond 2010 (Electroweak) \\ ( http://arxiv.org/abs/1005.2755 , 134kb) ------------------------------------------------------------------------------ \\ arXiv:1005.4306 replaced with revised version Wed, 28 Jul 2010 05:36:14 GMT (712kb,D) Title: Tau longitudinal polarization in B -> D tau nu and its role in the search for charged Higgs boson Authors: Minoru Tanaka and Ryoutaro Watanabe Categories: hep-ph Comments: 17 pages, 3 figures. Tau -> l nu nu is included in Sec. II. Accordingly the title is changed. References are added Report-no: OU-HET-668-2010 \\ ( http://arxiv.org/abs/1005.4306 , 712kb) ------------------------------------------------------------------------------ \\ arXiv:1005.5573 replaced with revised version Wed, 28 Jul 2010 02:01:43 GMT (9kb) Title: Tetra-quark Systems in Heavy Mesons Authors: Kunihiko Terasaki Categories: hep-ph hep-ex nucl-th Comments: 5 pages, 0 figures, Invited talk at the workshop on New Frontier of QCD 2010, Jan. 18 - Mar. 19, 2010, Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto, Japan Report-no: YITP-10-43, KANAZAWA-10-04 \\ ( http://arxiv.org/abs/1005.5573 , 9kb) ------------------------------------------------------------------------------ \\ arXiv:1006.0078 (*cross-listing*) replaced with revised version Wed, 28 Jul 2010 08:51:52 GMT (301kb) Title: Semiclassical Regge trajectories of noncritical string and large-N QCD Authors: Yuri Makeenko and Poul Olesen Categories: hep-th hep-ph Comments: 20pp., 2 figures; v2: minor changes, to appear in JHEP Report-no: ITEP-TH-17/10 \\ ( http://arxiv.org/abs/1006.0078 , 301kb) ------------------------------------------------------------------------------ \\ arXiv:1006.0172 (*cross-listing*) replaced with revised version Wed, 28 Jul 2010 17:14:19 GMT (23kb) Title: Chiral Lattice Fermions, Minimal Doubling, and the Axial Anomaly Authors: Brian C. Tiburzi Categories: hep-lat hep-ph nucl-th Comments: 15 pages, 1 figure, symmetries corrected, Symanzik analysis for currents added, marginal operators exposed Report-no: UMD-40762-479, INT-PUB-10-023 \\ ( http://arxiv.org/abs/1006.0172 , 23kb) ------------------------------------------------------------------------------ \\ arXiv:1006.5631 (*cross-listing*) replaced with revised version Wed, 28 Jul 2010 11:37:52 GMT (20kb) Title: Novel Nuclear Structure Aspects of the Neutrinoless Double Beta Decay Authors: J. Menendez, A. Poves, E. Caurier and F. Nowacki Categories: nucl-th hep-ph nucl-ex Comments: Proceedings of the 10th International Spring Seminar On Nuclear Physics, New Quests In Nuclear Structure, Vietri Sul Mare, May 21-25, 2010 (references added) \\ ( http://arxiv.org/abs/1006.5631 , 20kb) ------------------------------------------------------------------------------ \\ arXiv:1007.2107 replaced with revised version Wed, 28 Jul 2010 12:28:00 GMT (303kb) Title: Status of QCD Authors: Thomas Gehrmann Categories: hep-ph Comments: Plenary talk presented at XVIII International Workshop on Deep-Inelastic Scattering and Related Subjects, DIS 2010, April 2010, Firenze, Italy; v2: typos corrected, references added \\ ( http://arxiv.org/abs/1007.2107 , 303kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4705 replaced with revised version Wed, 28 Jul 2010 01:27:30 GMT (50kb,D) Title: Hard breakup of the deuteron into two $\Delta$-isobars Authors: Carlos G. Granados and Misak M. Sargsian Categories: hep-ph hep-ex nucl-ex nucl-th Comments: 17 pages, 3 figures \\ ( http://arxiv.org/abs/1007.4705 , 50kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4715 replaced with revised version Wed, 28 Jul 2010 04:49:15 GMT (309kb) Title: Holographic QCD Integrated back to Hidden Local Symmetry Authors: Masayasu Harada, Shinya Matsuzaki and Koichi Yamawaki Categories: hep-ph hep-th nucl-th Comments: 4 eps figures, 36 pages, latex, typos fixed \\ ( http://arxiv.org/abs/1007.4715 , 309kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4737 (*cross-listing*) replaced with revised version Wed, 28 Jul 2010 02:45:14 GMT (232kb) Title: Strange stars with different quark mass scaling Authors: A. Li Categories: astro-ph.SR hep-ph Comments: 10 pages, 4 figures. To appear in Proceedings for "Compact stars in the QCD phase diagram II (CSQCD II), May 20-24, 2009, KIAA at Peking University, Beijing - P. R. China \\ ( http://arxiv.org/abs/1007.4737 , 232kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- 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