Date: Mon, 30 Jan 12 01:06:15 GMT Subject: hep-ph daily 12 new + 2 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 Thu 26 Jan 12 21:00:00 GMT to Fri 27 Jan 12 21:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:1201.5668 Date: Thu, 26 Jan 2012 22:45:22 GMT (154kb,D) Title: A heavier gluino from t-b-tau Yukawa-unified SUSY Authors: Howard Baer, Shabbar Raza and Qaisar Shafi Categories: hep-ph \\ Supersymmetric models with t-b-tau Yukawa coupling unification and unified gaugino masses at the GUT scale with mu >0 show a mild preference for light gluino masses \lesssim 500 GeV. This range of gluino mass is now essentially ruled out by LHC searches. We show that a heavier gluino mass ~ 0.5-3 TeV can also be compatible with excellent t-b-tau Yukawa coupling unification in supersymmetric models with non-universal Higgs masses (NUHM2). The gluino in such models is the lightest colored sparticle, while the squark sector displays an inverted mass hierarchy with m_{\tilde q} ~ 5-20 TeV. We present some LHC testable benchmark points for which the lightest Higgs boson mass ~ 125 GeV. We also discuss LHC signatures of Yukawa-unified models with heavier gluinos. We expect gluino pair production followed by decay to final states containing four b-jets plus four W-bosons plus missing E_T to occur at possibly observable rates at LHC. \\ ( http://arxiv.org/abs/1201.5668 , 154kb) ------------------------------------------------------------------------------ \\ arXiv:1201.5702 Date: Fri, 27 Jan 2012 05:22:52 GMT (17kb) Title: GR@PPA 2.8.3 update Authors: Shigeru Odaka Categories: hep-ph Comments: 6 pages, 2 figures \\ GR@PPA 2.8 is a program package including event generators for single and double weak-boson production processes at hadron collisions, in which a jet matching method is implemented for simulating the weak-boson kinematics in the entire phase space.Since the initial release in November, 2010, several improvements have been applied to the program components. This report describes the improvements and changes applied so far, up to the 2.8.3 release. \\ ( http://arxiv.org/abs/1201.5702 , 17kb) ------------------------------------------------------------------------------ \\ arXiv:1201.5714 Date: Fri, 27 Jan 2012 07:56:11 GMT (168kb) Title: Light Stop Searches at the LHC with Monojet Events Authors: Manuel Drees, M. Hanussek, Jong Soo Kim Categories: hep-ph hep-ex Comments: 12 pages \\ We consider light top squarks (stops) in the minimal supersymmetric Standard Model at the Large Hadron Collider. Here, we assume that the lightest neutralino is the lightest supersymmetric particle (LSP) and the lighter stop is the next-to-LSP. Stop pair production is difficult to probe at the Large Hadron Collider for small stop-LSP mass splitting. It has been shown previously that even in this case stop detection is possible if one considers stop pair production in association with one hard jet. We reconsider this supersymmetric monojet signature and go beyond previous works by including the full Standard Model background and optimizing the cuts, working at the hadron level and including detector effects. As a result, a larger portion of the stop-LSP mass plane becomes accessible to monojet searches. \\ ( http://arxiv.org/abs/1201.5714 , 168kb) ------------------------------------------------------------------------------ \\ arXiv:1201.5750 Date: Fri, 27 Jan 2012 11:26:34 GMT (59kb) Title: New constraints on Yukawa-type interactions from the Casimir effect Authors: V. M. Mostepanenko, V. B. Bezerra, G. L. Klimchitskaya and C. Romero Categories: hep-ph quant-ph Comments: Plenary talk at the 10th International Conference "Quantum Field Theory Under the Influence of External Conditions" (Benasque, Spain, 2011); 15 pages, 7 figures \\ Measurements of the Casimir force are used to obtain stronger constraints on the parameters of hypothetical interactions predicted in different unification schemes beyond the Standard Model. We review new strong constraints on the Yukawa-type interactions derived during the last two years from recent experiments on measuring the lateral Casimir force, Casimir force in configurations with corrugated boundaries and the Casimir-Polder force. Specifically, from measurements of the lateral Casimir force compared with the exact theory the strengthening of constraints up to a factor of 24 millions was achieved. We also discuss further possibilities to strengthen constraints on the Yukawa interactions from the Casimir effect. \\ ( http://arxiv.org/abs/1201.5750 , 59kb) ------------------------------------------------------------------------------ \\ arXiv:1201.5759 Date: Fri, 27 Jan 2012 12:22:45 GMT (39kb) Title: Nucleon electromagnetic form factors and electroexcitation of low lying nucleon resonances in a light-front relativistic quark model Authors: I.G.Aznauryan and V.D.Burkert Categories: hep-ph nucl-th Comments: 9 pages, 6 figures Report-no: JLAB-PHY-12-1485 \\ We utilize a light-front relativistic quark model (LF RQM) to predict the 3q core contribution to the electroexcitation amplitudes for the Delta(1232)P33, N(1440)P11, N(1520)D13, and N(1535)S11 up to Q2= 12GeV2. The parameters of the model have been specified via description of the nucleon electromagnetic form factors in the approach that combines 3q and pion-cloud contributions in the LF dynamics. \\ ( http://arxiv.org/abs/1201.5759 , 39kb) ------------------------------------------------------------------------------ \\ arXiv:1201.5770 Date: Fri, 27 Jan 2012 13:27:06 GMT (107kb,D) Title: The strong running coupling at $\tau$ and $Z_0$ mass scales from lattice QCD Authors: B. Blossier, Ph.Boucaud, M.Brinet, F. De Soto, X. Du, V. Morenas, O. P\`ene, K. Petrov, J. Rodr\'iguez-Quintero Categories: hep-ph hep-lat Comments: 4 pages, 3 figures, 1 table \\ This letter reports on the first computation, from data obtained in lattice QCD with $u,d,s$ and $c$ quarks in the sea, of the running strong coupling via the ghost-gluon coupling renormalized in the MOM Taylor scheme. We provide with estimates of $\alpha_{\bar{\rm MS}}(m_\tau^2)$ and $\alpha_{\bar{\rm MS}}(m_Z^2)$ (for which the inclusion of the dynamical charm quark makes the running much safer) in very good agreement with experimental results. \\ ( http://arxiv.org/abs/1201.5770 , 107kb) ------------------------------------------------------------------------------ \\ arXiv:1201.5804 Date: Fri, 27 Jan 2012 15:48:50 GMT (376kb) Title: Complete QCD Corrections to Hadronic $Z$--Decays in Order $\alpha_s^4$ Authors: P. A. Baikov, K. G. Chetyrkin, J. H. K\"uhn, J. Rittinger Categories: hep-ph \\ Corrections of order $\alpha_s^4$ for the axial singlet contributions for the decay rates of the $Z$-boson into hadrons are evaluated in the limit of the heavy top quark mass. Combined with recently finished ${\cal O}(\alpha_s^4)$ calculations of the non-signlet corrections, the new results directly lead us to the first {\em complete} ${\cal O}(\alpha_s^4)$ prediction for the total hadronic decay rate of the Z-boson. The new ${\cal O}(\alpha_s^4)$ term in Z-decay rate lead to a significant stabilization of the perturbative series, to a reduction of the theory uncertainty in the strong coupling constant $\alpha_s$, as extracted from these measurements, and to a small shift of the central value. \\ ( http://arxiv.org/abs/1201.5804 , 376kb) ------------------------------------------------------------------------------ \\ arXiv:1201.5839 Date: Fri, 27 Jan 2012 17:20:27 GMT (133kb) Title: SUSY-Yukawa Sum Rule at the LHC and the ILC Authors: Maxim Perelstein and Michael Saelim Categories: hep-ph Comments: 6 pages, 1 figure; contributed to the proceedings of the 2011 International Workshop on Future Linear Colliders (LCWS11), Granada, Spain, September 26-30, 2011 \\ In this talk, we discuss the SUSY-Yukawa sum rule, a relation among masses and mixing angles of the third-generation squarks which follows directly from the coupling relation responsible for canceling the quadratic divergence in the Higgs mass. Radiative corrections modify the sum rule, introducing dependence on a variety of SUSY parameters beyond the third-generation squark sector. If some of those parameters are measured experimentally, a sharp prediction for the sum rule is possible. We demonstrate this point with a quantitative study. We also discuss the prospects for measuring the ingredients of the sum rule at the LHC, and argue that a high-energy electron-positron collider such as the ILC would be necessary to test the sum rule. \\ ( http://arxiv.org/abs/1201.5839 , 133kb) ------------------------------------------------------------------------------ \\ arXiv:1201.5868 Date: Fri, 27 Jan 2012 19:23:42 GMT (65kb) Title: Gauge Coupling Beta Functions in the Standard Model to Three Loops Authors: Luminita N. Mihaila, Jens Salomon, Matthias Steinhauser Categories: hep-ph Comments: 4 pages, 1 figure Report-no: SFB/CPP-12-04, TTP12-03 \\ In this paper we compute the three-loop corrections to the beta functions of the three gauge couplings in the Standard Model of particle physics using the minimal subtraction scheme and taking into account Yukawa and Higgs self couplings. \\ ( http://arxiv.org/abs/1201.5868 , 65kb) ------------------------------------------------------------------------------ \\ arXiv:1201.5881 Date: Fri, 27 Jan 2012 20:15:08 GMT (229kb) Title: Deconfinement in the presence of a strong magnetic background: an exercise within the MIT bag model Authors: Eduardo S. Fraga and Leticia F. Palhares Categories: hep-ph nucl-th Comments: 8 pages, 4 figures \\ We study the effect of a very strong homogeneous magnetic field B on the thermal deconfinement transition within the simplest phenomenological approach: the MIT bag pressure for the quark-gluon plasma and a gas of pions for the hadronic sector. Even though the model is known to be crude in numerical precision and misses the correct nature of the (crossover) transition, it provides a simple setup for the discussion of some subtleties of vacuum and thermal contributions in each phase, and should provide a reasonable qualitative description of the critical temperature in the presence of B. We find that the critical temperature decreases. \\ ( http://arxiv.org/abs/1201.5881 , 229kb) ------------------------------------------------------------------------------ \\ arXiv:1201.5882 Date: Fri, 27 Jan 2012 20:22:50 GMT (73kb,D) Title: W+n-jet predictions with MC@NLO in Sherpa Authors: Stefan Hoeche, Frank Krauss, Marek Schonherr, Frank Siegert Categories: hep-ph hep-ex Comments: 4 pages, 1 table, 2 figures Report-no: SLAC-PUB 14859, IPPP/12/03, DCPT/12/06, LPN12-026, MCNET-12-01, FR-PHENO-2012-001 \\ Results for the production of W-bosons in conjunction with up to three jets including parton shower corrections are presented and compared to recent LHC data. These results consistently incorporate the full next-to-leading order QCD corrections through the MC@NLO method, as implemented in the Sherpa event generator, with the virtual corrections obtained from the BlackHat library. \\ ( http://arxiv.org/abs/1201.5882 , 73kb) ------------------------------------------------------------------------------ \\ arXiv:1201.5890 Date: Fri, 27 Jan 2012 20:58:55 GMT (437kb) Title: A New Mechanism for Generating a Single Transverse Spin Asymmetry Authors: Yuri V. Kovchegov, Matthew D. Sievert Categories: hep-ph nucl-th Comments: 25 pages, 14 figues \\ We propose a new mechanism for generating a single transverse spin asymmetry (STSA) in polarized proton--proton and proton-nucleus collisions in the high-energy scattering approximation. In this framework the STSA originates from the q -> q G splitting in the projectile (proton) light-cone wave function followed by a perturbative (C-odd) odderon interaction, together with a C-even interaction, between the projectile and the target. We show that the obtained expression for the STSA of the produced quarks is in qualitative agreement with experiment: STSA decreases with decreasing projectile x_F and is a non-monotonic function of the transverse momentum k_T, peaking near the saturation scale Q_s in our framework. Our mechanism predicts that the quark STSA in proton-nucleus collisions should be much smaller than in proton-proton collisions. We also observe that in our formalism the STSA for prompt photons is zero. \\ ( http://arxiv.org/abs/1201.5890 , 437kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:1201.5697 (*cross-listing*) Date: Fri, 27 Jan 2012 04:23:31 GMT (368kb,D) Title: "Evaporation" of a flavor-mixed particle from a gravitational potential Authors: Mikhail V. Medvedev Categories: astro-ph.CO gr-qc hep-ph hep-th Comments: 8 pages, 1 figure Journal-ref: J. Phys. A: Math. Theor. 43 (2010) 372002 (7pp) DOI: 10.1088/1751-8113/43/37/372002 \\ We demonstrate that a stable particle with flavor mixing, confined in a gravitational potential can gradually and irreversibly escape -- or "evaporate" -- from it. This effect is due to mass eigenstate conversions which occur in interactions (scattering) of mass states with other particles even when the energy exchange between them is vanishing. The evaporation and conversion are quantum effects not related to flavor oscillations, particle decay, quantum tunneling or other well-known processes. Apart from their profound academic interest, these effects should have tremendous implications for cosmology, e.g., (1) the cosmic neutrino background distortion is predicted and (2) the softening of central cusps in dark matter halos and smearing out or destruction of dwarf halos were suggested. \\ ( http://arxiv.org/abs/1201.5697 , 368kb) ------------------------------------------------------------------------------ \\ arXiv:1201.5755 (*cross-listing*) Date: Fri, 27 Jan 2012 12:06:48 GMT (224kb) Title: Localized Propagating Tachyons in Extended Relativity Theories Authors: Matej Pav\v{s}i\v{c} Categories: hep-th gr-qc hep-ph Comments: 22 pages, 3 figures \\ We examine the possibility of localized propagating tachyonic fields within a properly extended relativity. A possible extension is to include superluminal transformations and reference frames. This leads to complex 4D spacetime, or real 8D spacetime M_{4,4}. The mass shell constraint in M_{4,4} becomes, after first quantization, the ultrahyperbolic Klein-Gordon equation. The Cauchy problem for such equation is not well posed, because it is not possible to freely specify initial data on a 7D hypersurface of M_{4,4}. We explicitly demonstrate that it is possible to do it on a space-like 4-surface for bradyons, and on a time-like 4-surface for tachyons. But then the evolution of a bradyonic field into the four time-like directions, or the "evolution" of a tachyonic field into the four space-like directions, is not uniquely determined. We argue that this is perhaps no so bad, because in quantum field theory (after second quantization) the classical trajectories of fields are not determined anyway, and so it does not matter, if they are not completely determined already in the first quantized theory. A next possible extension of relativity is to consider 16D Clifford space, C, a space whose elements are oriented r-volumes, r=0,1,2,3,4 of real 4D spacetime. Then the evolution parameter can be associated with an extra light-cone coordinate, e.g., with the sum of the scalar and the psudoscalar coordinate, and initial data can be given on a light-light hypersurface, in which case the Cauchy problem is well posed. This procedure brings us to the Stueckelberg theory which contains localized propagating tachyons in 4D spacetime. \\ ( http://arxiv.org/abs/1201.5755 , 224kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:1107.1428 replaced with revised version Fri, 27 Jan 2012 07:22:08 GMT (42kb,D) Title: Photon-photon interaction and Schwinger process Authors: K. Bulycheva, S. Guts Categories: hep-ph hep-th Comments: 11 pages, 5 figures \\ ( http://arxiv.org/abs/1107.1428 , 42kb) ------------------------------------------------------------------------------ \\ arXiv:1108.0346 replaced with revised version Fri, 27 Jan 2012 08:52:01 GMT (27kb) Title: Dilaton in a soft-wall holographic approach to mesons and baryons Authors: Thomas Gutsche, Valery E. Lyubovitskij, Ivan Schmidt, Alfredo Vega Categories: hep-ph Comments: 21 pages, accepted for publication in Phys. Rev. D \\ ( http://arxiv.org/abs/1108.0346 , 27kb) ------------------------------------------------------------------------------ \\ arXiv:1108.0542 replaced with revised version Fri, 27 Jan 2012 09:26:19 GMT (138kb) Title: Gluino-Squark Production at the LHC: The Threshold Authors: Matthias R. Kauth, Achim Kress and Johann H. Kuhn Categories: hep-ph Comments: 25 pages, 9 figures, Eq. 10 modified. Reference [30] added. Discussion of the expected quality of the approximation added before eq. 23. Some changes in notation. Typos corrected Report-no: SFB/CPP-11-45, TTP11-24 \\ ( http://arxiv.org/abs/1108.0542 , 138kb) ------------------------------------------------------------------------------ \\ arXiv:1111.0605 (*cross-listing*) replaced with revised version Thu, 26 Jan 2012 21:10:04 GMT (170kb) Title: Dark Radiation from Particle Decays during Big Bang Nucleosynthesis Authors: Justin L. Menestrina and Robert J. Scherrer Categories: astro-ph.CO hep-ph Comments: 6 pages, 3 figures, added figure and discussion of observational constraints, to appear in Phys. Rev. D \\ ( http://arxiv.org/abs/1111.0605 , 170kb) ------------------------------------------------------------------------------ \\ arXiv:1111.4465 (*cross-listing*) replaced with revised version Fri, 27 Jan 2012 20:13:43 GMT (27kb) Title: Total nucleon-nucleon cross sections in large N(c) QCD Authors: Thomas D. Cohen, Boris A. Gelman Categories: nucl-th hep-ph nucl-ex Comments: 9 pages, 3 figures, typographical errors corrected \\ ( http://arxiv.org/abs/1111.4465 , 27kb) ------------------------------------------------------------------------------ \\ arXiv:1111.6515 (*cross-listing*) replaced with revised version Fri, 27 Jan 2012 13:21:50 GMT (21kb) Title: On the interplay of direct and indirect CP violation in the charm sector Authors: Marco Gersabeck (1), Michael Alexander (2), Silvia Borghi (2 and 3), Vladimir V Gligorov (1), Chris Parkes (3 and 1) ((1) CERN, Geneva, Switzerland, (2) School of Physics and Astronomy, University of Glasgow, Glasgow, UK, (3) School of Physics and Astronomy, University of Manchester, Manchester, UK) Categories: hep-ex hep-ph Comments: accepted for publication in J. Phys. G \\ ( http://arxiv.org/abs/1111.6515 , 21kb) ------------------------------------------------------------------------------ \\ arXiv:1201.4039 (*cross-listing*) replaced with revised version Fri, 27 Jan 2012 13:12:42 GMT (36kb) Title: D-meson decay constants and a check of factorization in non-leptonic B-decays Authors: Damir Becirevic, Vittorio Lubicz, Francesco Sanfilippo, Silvano Simula and Cecilia Tarantino Categories: hep-lat hep-ex hep-ph Comments: 16 pages, 4 eps figures Report-no: LPT 11-119; RM3-TH/12-1 \\ ( http://arxiv.org/abs/1201.4039 , 36kb) ------------------------------------------------------------------------------ \\ arXiv:1201.4280 replaced with revised version Fri, 27 Jan 2012 17:50:29 GMT (20kb) Title: An estimate of theta_14 independent of the reactor antineutrino flux determinations Authors: Antonio Palazzo Categories: hep-ph hep-ex Comments: 4 pages, 1 figure, added footnotes and references \\ ( http://arxiv.org/abs/1201.4280 , 20kb) ------------------------------------------------------------------------------ \\ arXiv:1201.4458 replaced with revised version Fri, 27 Jan 2012 09:41:24 GMT (343kb) Title: GPDs of the nucleons and elastic scattering at high energies Authors: O.V. Selyugin Categories: hep-ph hep-ex Comments: 12 pages, 20 figures, minor language corrections \\ ( http://arxiv.org/abs/1201.4458 , 343kb) ------------------------------------------------------------------------------ \\ arXiv:1201.4722 replaced with revised version Fri, 27 Jan 2012 16:54:23 GMT (446kb) Title: Techni-dilaton at 125 GeV Authors: Shinya Matsuzaki and Koichi Yamawaki Categories: hep-ph hep-ex Comments: 5 pages, 4 eps figures, latex; some references added Report-no: MISC-2012-02 \\ ( http://arxiv.org/abs/1201.4722 , 446kb) ------------------------------------------------------------------------------ \\ arXiv:1201.5598 replaced with revised version Fri, 27 Jan 2012 20:26:16 GMT (9kb) Title: Model-independent determination of the parity of $\Xi$ resonances Authors: K. Nakayama, Yongseok Oh, H. Haberzettl Categories: hep-ph hep-ex nucl-ex nucl-th Comments: 4 pages, REVTeX \\ ( http://arxiv.org/abs/1201.5598 , 9kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- 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