Tue·Aug 6, 2019Tuesday·August 6, 2019

1. 01*

   Centrality dependence of Electrical and Hall conductivity at RHIC and LHC energies for a Conformal System

   Bhaswar Chatterjee🇮🇳 · Rutuparna Rath🇮🇳 · Golam Sarwar🇮🇳 · Raghunath Sahoo

   In this work, we study electrical conductivity and Hall conductivity in the presence of electromagnetic field using Relativistic Boltzmann Transport Equation with Relaxation Time Approximation. We evaluate these transport coefficients for a strongly interacting system consisting of nearly massless particles which is similar to Quark-Gluon Plasma and is likely to be formed in heavy-ion collision experiments. We explicitly include the effects of magnetic field in the calculation of relaxation time. The values of magnetic field are obtained for all the centrality classes of Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=$ 200 GeV and Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 2.76 TeV. We consider the three lightest quark flavors and their corresponding antiparticles in this study. We estimate the temperature dependence of the electrical conductivity and Hall conductivity for different strengths of magnetic field. We observe a significant dependence of temperature on electrical and Hall conductivity in the presence of magnetic field.

   ↳ hep-phnucl-exnucl-thEPJA(2021)·11 citations
2. 02*

   Isospin splitting of pion elliptic flow in relativistic heavy-ion collisions

   He Liu🇨🇳 · Feng-Tao Wang🇨🇳 · Kai-Jia Sun🇺🇸 · Jun Xu🇨🇳 · Che Ming Ko🇺🇸

   Based on the framework of an extended multiphase transport model with mean-field potentials in both the partonic phase and the hadronic phase, we explain the elliptic flow difference between ${\pi }^{+}$ and ${\pi }^{-}$ in the beam-energy scan program at the relativistic heavy-ion collider by incorporating the vector-isovector potential for quarks and antiquarks with different isospins. It is found that the isospin splitting of pion elliptic flow favors a strong vector-isovector interaction, and thus serves as a probe of the quark matter equation of state as well as the QCD phase structure at finite baryon and isospin chemical potentials.

   ↳ nucl-thhep-exnucl-exPLB(2019)·21 citations
3. 03*

   Probing of violation of Lorentz invariance by ultracold neutrons in the Standard Model Extension

   A. N. Ivanov🇦🇹 · M. Wellenzohn🇦🇹 · H. Abele🇦🇹

   We analyze a dynamics of ultracold neutrons (UCNs) caused by interactions violating Lorentz invariance within the Standard Model Extension (SME) (Colladay and Kostelecky, Phys. Rev. D55, 6760 (1997) and Kostelecky, Phys. Rev. D69, 105009 (2004)). We use the effective non-relativistic potential for interactions violating Lorentz invariance derived by Kostelecky and Lane (J. Math. Phys. 40, 6245 (1999)) and calculate contributions of these interactions to the transition frequencies of transitions between quantum gravitational states of UCNs bouncing in the gravitational field of the Earth. Using the experimental sensitivity of qBounce experiments we make some estimates of upper bounds of parameters of Lorentz invariance violation in the neutron sector of the SME which can serve as a theoretical basis for an experimental analysis. We show that an experimental analysis of transition frequencies of transitions between quantum gravitational states of unpolarized and polarized UCNs should allow to place some new constraints in comparison to the results adduced by Kostelecky and Russell in Rev. Mod. Phys. 83, 11 (2011); edition 2019, arXiv: 0801.0287v12 [hep-ph].

   ↳ hep-phgr-qcnucl-exPLB(2019)·24 citations
4. 04*

   The soft drop groomed jet radius at NLL

   Zhong-Bo Kang🇺🇸 · Kyle Lee🇺🇸 · Xiaohui Liu🇨🇳 · Duff Neill🇺🇸 · Felix Ringer🇺🇸

   We present results for the soft drop groomed jet radius $R_g$ at next-to-leading logarithmic accuracy. The radius of a groomed jet which corresponds to the angle between the two branches passing the soft drop criterion is one of the characteristic observables relevant for the precise understanding of groomed jet substructure. We establish a factorization formalism that allows for the resummation of all relevant large logarithms, which is based on demonstrating the all order equivalence to a jet veto in the region between the boundaries of the groomed and ungroomed jet. Non-global logarithms including clustering effects due to the Cambridge/Aachen algorithm are resummed to all orders using a suitable Monte Carlo algorithm. We perform numerical calculations and find a very good agreement with Pythia 8 simulations. We provide theoretical predictions for the LHC and RHIC.

   ↳ hep-phhep-exnucl-exnucl-thJHEP(2020)·57 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.