Fri·Aug 1, 2014Friday·August 1, 2014

1. 01*

   The low and intermediate mass dilepton and photon results

   Lijuan Ruan🇺🇸

   I summarize and discuss some of the experimental results on the low and intermediate mass dileptons and direct photons presented at Quark Matter 2014.

   nucl-exNPA(2014)·13 citations
2. 02*

   Correlated Fermion Pairs in Nuclei and Ultracold Atomic Gases

   O. Hen🇮🇱 · L. B. Weinstein🇺🇸 · E. Piasetzky🇮🇱 · G. A. Miller🇺🇸 · M. M. Sargsian🇺🇸 · Y. Sagi

   Background: The high momentum distribution of atoms in two spin-state ultra-cold atomic gases with strong short-range interactions between atoms with different spins, which can be described using Tan's contact, are dominated by short range pairs of different fermions and decreases as $k^{-4}$. In atomic nuclei the momentum distribution of nucleons above the Fermi momentum ($k>k_F\approx 250$ Mev/c) is also dominated by short rangecorrelated different-fermion (neutron-proton) pairs. Purpose: Compare high-momentum unlike-fermion momentum distributions in atomic and nuclear systems. Methods: We show that, for $k>k_F$ MeV/c, nuclear momentum distributions are proportional to that of the deuteron. We then examine the deuteron momentum distributions derived from a wide variety of modern nucleon-nucleon potentials that are consistent with $NN$-scattering data. Results: The high momentum tail of the deuteron momentum distribution, and hence of the nuclear momentum distributions appears to decrease as $k^{-4}$. This behavior is shown to arise from the effects of the tensor part of the nucleon-nucleon potential. In addition, when the dimensionless interaction strength for the atomic system is chosen to be similar to that of atomic nuclei, the probability for finding a short range different-fermion pair in both systems is the same. Conclusions: Although nuclei do not satisfy all of the conditions for Tan's contact, the observed similarity of the magnitude and $k^{-4}$ shape of nuclear and atomic momentum distributions is remarkable because these systems differ by about $20$ orders of magnitude in density. This similarity may lead to a greater understanding of nuclei and the density dependence of nuclear systems.

   nucl-excond-mat.quant-gasnucl-thPRC(2015)·73 citations
3. 03*

   Influence of temperature dependent shear viscosity on elliptic flow at back- and forward rapidities in ultrarelativistic heavy-ion collisions

   Etele Molnar🇭🇺 · Hannu Holopainen🇩🇪 · Pasi Huovinen🇩🇪 · Harri Niemi🇫🇮

   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 at midrapidity, but the further away from midrapidity, the more dominant the hadronic viscosity is. We find that the centrality and rapidity dependence of the elliptic and quadrangular flows can help to distinguish different parametrizations of $(\eta /s)(T)$. We also find that at midrapidity the flow harmonics are almost independent of the decoupling criterion, but show some sensitivity to the criterion at back- and forward rapidities.

   ↳ nucl-thhep-phnucl-exPRC(2014)·58 citations
4. 04*

   Multiplicity fluctuation from hydrodynamic noise

   Tetsufumi Hirano🇯🇵 · Ryuichi Kurita🇯🇵 · Koichi Murase🇯🇵 · Kenichi Nagai🇯🇵

   We discuss multiplicity fluctuation caused by noises during hydrodynamic evolution of the quark-gluon fluid created in high-energy nuclear collisions.

   ↳ nucl-thcond-mat.stat-mechhep-phnucl-exNPA(2014)·4 citations
5. 05*

   Measurement of hadron composition in charged jets from pp collisions with the ALICE experiment

   Xianguo Lu (ALICE Collaboration)🇩🇪

   We report the first measurement of charged pion, kaon and (anti-)proton production in jets from hadron colliders. The measurement was carried out with the ALICE detector using $2\times 10^8$ minimum bias pp collisions at a centre-of-mass energy of $\sqrt{s}=7$ TeV at the LHC. We present the $\pi$, K and p transverse momentum ($p_{\text{T}}$) spectra, as well as the spectra of the reduced momentum ($z^{\text{ch}}\equiv p_{\text{T}}^{\text{track}}/p_{\text{T, jet}}^{\text{ch}}$), in charged jets of $p_{\text{T}}$ between 5--20 $\text{GeV}/c$. The measurement is compared to Monte Carlo calculations.

   ↳ hep-exnucl-exNPA(2014)·18 citations
6. 06*

   Alpha clustering and flow in ultra-relativistic heavy-ion collisions

   Wojciech Broniowski🇵🇱 · Enrique Ruiz Arriola🇪🇸

   We show how ultra-relativistic collisions of light nuclei with heavy targets may be used to record snap-shots of the ground-state configurations and reveal information on cluster correlations. The development of collective flow in the formed fireball, which reflects the geometric correlations in the initial state, is essential for the method. As an illustration we analyze the 12C-208Pb collisions.

   ↳ nucl-thnucl-exJ.Phys.Conf.Ser.(2014)·5 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.