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Jun 30, 2018
06/18

by
Etele Molnar; Hannu Holopainen; Pasi Huovinen; Harri Niemi

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We explore the influence of a temperature-dependent shear viscosity over entropy density ratio $\eta/s$ on the azimuthal anisotropies v_2 and v_4 of hadrons at various rapidities. We find that in Au+Au collisions at full RHIC energy, $\sqrt{s_{NN}}=200$ GeV, the flow anisotropies are dominated by hadronic viscosity at all rapidities, whereas in Pb+Pb collisions at the LHC energy, $\sqrt{s_{NN}}=2760$ GeV, the flow coefficients are affected by the viscosity both in the plasma and hadronic phases...

Topics: High Energy Physics - Phenomenology, Nuclear Experiment, Nuclear Theory

Source: http://arxiv.org/abs/1407.8152

9
9.0

Jun 30, 2018
06/18

by
Henryk Czyz; Johann H. Kuhn; Szymon Tracz

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New parametrisation for the electric and the magnetic form factors of proton and neutron are presented. The proton form factors describe well the recent measurements by BaBar collaboration and earlier ones of the ratio of the form factors in space-like region. The neutron form factors are consistent with earlier measurements of neutron pair production and ratio of the form factors in the space-like region. These form factors are implemented into the generator PHOKHARA, which simulates the...

Topic: High Energy Physics - Phenomenology

Source: http://arxiv.org/abs/1407.7995

5
5.0

Jun 30, 2018
06/18

by
Holger Gies; René Sondenheimer

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We study a chiral Yukawa model mimicking the Higgs-top-bottom sector of the standard model. We re-analyze the conventional arguments that relate a lower bound for the Higgs mass with vacuum stability in the light of exact results for the regularized fermion determinant as well as in the framework of the functional renormalization group. In both cases, we find no indication for vacuum instability nor meta-stability induced by top-fluctuations if the cutoff is kept finite but arbitrary. A lower...

Topics: High Energy Physics - Theory, High Energy Physics - Phenomenology

Source: http://arxiv.org/abs/1407.8124

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11

Jun 30, 2018
06/18

by
Luis A. Anchordoqui; Ignatios Antoniadis; De-Chang Dai; Wan-Zhe Feng; Haim Goldberg; Xing Huang; Dieter Lust; Dejan Stojkovic; Tomasz R. Taylor

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[Abridged] We consider extensions of the standard model based on open strings ending on D-branes. Assuming that the fundamental string mass scale M_s is in the TeV range and that the theory is weakly coupled, we discuss possible signals of string physics at the upcoming HL-LHC run (3000 fb^{-1}) with \sqrt{s} = 14 TeV, and at potential future pp colliders, HE-LHC and VLHC, operating at \sqrt{s} = 33 and 100 TeV, respectively. In such D-brane constructions, the dominant contributions to...

Topics: High Energy Physics - Theory, High Energy Physics - Phenomenology

Source: http://arxiv.org/abs/1407.8120

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7.0

Jun 30, 2018
06/18

by
Stanley J. Brodsky; Guy F. de Teramond; Hans Gunter Dosch; Joshua Erlich

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In this report we explore the remarkable connections between light-front dynamics, its holographic mapping to gravity in a higher-dimensional anti-de Sitter (AdS) space, and conformal quantum mechanics. This approach provides new insights into the origin of a fundamental mass scale and the physics underlying confinement dynamics in QCD in the limit of massless quarks. The result is a relativistic light-front wave equation for arbitrary spin with an effective confinement potential derived from a...

Topics: High Energy Physics - Theory, High Energy Physics - Phenomenology

Source: http://arxiv.org/abs/1407.8131

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10.0

Jun 30, 2018
06/18

by
Thorsten Renk; Rupa Chatterjee; Kari J. Eskola; Harri Niemi; Ilkka Helenius

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One of the unsolved problems in the current 'standard model' of heavy ion physics is the apparent rapid thermalization of QCD matter in the pre-equilibrium stage. While it is challenging to probe this mechanism directly, there are now several observables available which allow tomographic imaging of the initial state geometry, which is expected to carry remnant information of the equilibration mechanism. On the fluid dynamics side, scaled fluctuations in the momentum space anisotropy parameters...

Topics: High Energy Physics - Phenomenology, Nuclear Theory

Source: http://arxiv.org/abs/1407.7954

8
8.0

Jun 30, 2018
06/18

by
Wan-Li Ju; Guo-Li Wang; Hui-Feng Fu; Zhi-Hui Wang; Ying Li

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The rare processes $B_c\to D_{(s)J} ^{(*)}\mu\bar{\mu}$, where $D_{(s)J}^{(*)}$ stands for the final meson $D_{s0}^*(2317)$, $D_{s1}(2460,2536)$,~$D_{s2}^*(2573)$, $D_0^*(2400)$, $D_{1}(2420,2430)$ or~$D_{2}^*(2460)$, are studied within the Standard Model. The hadronic matrix elements are evaluated in the Bethe-Salpeter approach and furthermore a discussion on the gauge-invariant condition of the annihilation hadronic currents is presented. Considering the penguin, box, annihilation,...

Topic: High Energy Physics - Phenomenology

Source: http://arxiv.org/abs/1407.7968