Tue·May 2, 2017Tuesday·May 2, 2017

1. 01*

   Elliptic flow of electrons from beauty-hadron decays extracted from Pb--Pb collision data at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV

   D. Moreira de Godoy🇩🇪 · F. Herrmann🇩🇪 · M. Klasen🇩🇪 · C. Klein-Bösing🇩🇪 · A. A. P. Suaide🇧🇷

   We present a calculation of the elliptic flow of electrons from beauty-hadron decays in semi-central Pb--Pb collisions at centre-of-mass energy per colliding nucleon pair, represented as $\sqrt{s_{\mathrm{NN}}}$, of 2.76 TeV. The result is obtained by the subtraction of the charm quark contribution in the elliptic flow of electrons from heavy-flavour hadron decays in semi-central Pb--Pb collisions at \snn = 2.76 TeV recently made publicly available by the ALICE collaboration.

   nucl-exEPJC(2018)·1 citation
2. 02*

   Multistage Monte-Carlo simulation of jet modification in a static medium

   JETSCAPE Collaboration: Shanshan Cao🇺🇸 · Chanwook Park🇨🇦 · R. Alex Barbieri🇺🇸 · Steffen A. Bass🇺🇸 · Dennis Bazow🇺🇸 · Jonah Bernhard🇺🇸 · Jacob Coleman🇺🇸 · Rainer Fries🇺🇸 · Charles Gale🇨🇦 · Yayun He🇨🇳 · Ulrich Heinz🇺🇸 · Barbara V. Jacak🇺🇸 and 21 other authors

   The modification of hard jets in an extended static medium held at a fixed temperature is studied using three different Monte-Carlo event generators (LBT, MATTER, MARTINI). Each event generator contains a different set of assumptions regarding the energy and virtuality of the partons within a jet versus the energy scale of the medium, and hence, applies to a different epoch in the space-time history of the jet evolution. For the first time, modeling is developed where a jet may sequentially transition from one generator to the next, on a parton-by-parton level, providing a detailed simulation of the space-time evolution of medium modified jets over a much broader dynamic range than has been attempted previously in a single calculation. Comparisons are carried out for different observables sensitive to jet quenching, including the parton fragmentation function and the azimuthal distribution of jet energy around the jet axis. The effect of varying the boundary between different generators is studied and a theoretically motivated criterion for the location of this boundary is proposed. The importance of such an approach with coupled generators to the modeling of jet quenching is discussed.

   ↳ nucl-thhep-phnucl-exPRC(2017)·112 citations
3. 03*

   Low density nuclear matter with light clusters in a generalized nonlinear relativistic mean-field model

   Zhao-Wen Zhang🇨🇳 · Lie-Wen Chen🇨🇳

   We systematically investigate the thermodynamic properties of homogeneous nuclear matter with light clusters at low densities and finite temperatures using a generalized nonlinear relativistic mean-field (gNL-RMF) model, in which light clusters up to $\alpha$ ($1\le A\le 4$) are included as explicit degrees of freedom and treated as point-like particles with their interactions described by meson exchanges and the medium effects on the cluster binding energies are described by density- and temperature-dependent energy shifts with the parameters obtained by fitting the experimental cluster Mott densities. We find that the composition of low density nuclear matter with light clusters is essentially determined by the density- and temperature-dependence of the cluster binding energy shifts. Compared with the values of the conventional (second-order) symmetry energy, symmetry free energy and symmetry entropy, their fourth-order values are found to be significant at low densities ($\rho \sim 10^{-3}$ fm${}^{-3}$) and low temperatures ($T\lesssim 3$ MeV), indicating the invalidity of the empirical parabolic law for the isospin asymmetry dependence of these nuclear matter properties. Our results indicate that in the density region of $\rho \gtrsim 0.02$ fm${}^{-3}$, the clustering effects become insignificant and the nuclear matter is dominated by nucleon degree of freedom. In addition, we compare the gNL-RMF model predictions with the corresponding experimental data on the symmetry energy and symmetry free energy at low densities and finite temperatures extracted from heavy-ion collisions, and reasonable agreement is found.

   ↳ nucl-thastro-ph.SRnucl-exPRC(2017)·18 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.