Mon·Dec 8, 2014Monday·December 8, 2014

1. 01*

   Study of the neutral mesons in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV in the ALICE experiment at LHC

   Lucia Leardini (for the ALICE Collaboration)🇩🇪

   The ${\pi }^0$ and $\eta$ meson production in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV is studied with the ALICE experiment at the LHC. The ${\pi }^0$ invariant yields and nuclear modification factor $R_{\text{mbox}AA}$ are presented here in six centrality classes. The results are a combined measurement using the Photon Conversion Method (PCM) and the PHOS detector, in the transverse momentum range 0.4 $<p_{\text{mbox}T}<$ 12 GeV/$c$. The ${\pi }^0$ $R_{\text{mbox}AA}$ is studied in different centrality classes and compared with results from experiments at lower energies, both as a function of transverse momentum. The $\eta$ meson production is studied using the PCM and the EMCal detector. The combination of the individual results will make possible the measurement of the $\eta$ differential invariant cross section as a function of transverse momentum from 1 to 22 GeV/$c$ in different centrality classes.

   nucl-exJ.Phys.Conf.Ser.(2015)·0 citations
2. 02*

   Hidden Color and the $b_1$ structure function of the deuteron

   Gerald A. Miller🇺🇸

   The $b_1$ structure function is an observable feature of a spin-1 system sensitive to non-nucleonic components of the target nuclear wave function. A simple model for hidden-color, six-quark configurations is proposed and found to give substantial contributions for values of $x>0.2$. Good agreement with Hermes data is obtained. Predictions are made for an upcoming JLab experiment.

   ↳ nucl-thhep-phnucl-exFew Body Syst.(2015)·2 citations
3. 03*

   Cooper-Frye Negative Contributions in a Coarse-Grained Transport Approach

   D. Oliinychenko🇺🇦 · P. Huovinen🇩🇪 · H. Petersen🇩🇪

   Many models of heavy ion collisions employ relativistic hydrodynamics to describe the system evolution at high densities. The Cooper-Frye formula is applied in most of these models to turn the hydrodynamical fields into particles. However, the number of particles obtained from the Cooper-Frye formula is not always positive-definite. Physically negative contributions of the Cooper-Frye formula are particles that stream backwards into the hydrodynamical region. We quantify the Cooper-Frye negative contributions in a coarse-grained transport approach, which allows to compare them to the actual number of underlying particles crossing the transition hypersurface. It is found that the number of underlying inward crossings is much smaller than the one the Cooper-Frye formula gives under the assumption of equilibrium distribution functions. The magnitude of Cooper-Frye negative contributions is also investigated as a function of hadron mass, collision energy in the range $E_{\mathrm{lab}}=5-160A$ GeV, and collision centrality. The largest negative contributions we find are around 13% for the pion yield at midrapidity at $E_{\mathrm{lab}}=20A$ GeV collisions.

   ↳ nucl-thhep-phnucl-exJ.Phys.Conf.Ser.(2015)·4 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.