Thu·Mar 14, 2019Thursday·March 14, 2019

1. 01*

   Collision energy dependence of second-order off-diagonal and diagonal cumulants of net-charge, net-proton and net-kaon multiplicity distributions in Au+Au collisions

   STAR Collaboration: J. Adam · L. Adamczyk · J. R. Adams · J. K. Adkins · G. Agakishiev · M. M. Aggarwal · Z. Ahammed · I. Alekseev · D. M. Anderson · R. Aoyama · A. Aparin · D. Arkhipkin and 335 other authors

   We report the first measurements of a complete second-order cumulant matrix of net-charge, net-proton, and net-kaon multiplicity distributions for the first phase of the beam energy scan program at RHIC. This includes the centrality and, for the first time, the pseudorapidity window dependence of both diagonal and off-diagonal cumulants in Au+Au collisions at \sNN~= 7.7-200 GeV. Within the available acceptance of $|\eta |<0.5$, the cumulants grow linearly with the pseudorapidity window. Relative to the corresponding measurements in peripheral collisions, the ratio of off-diagonal over diagonal cumulants in central collisions indicates an excess correlation between net-charge and net-kaon, as well as between net-charge and net-proton. The strength of such excess correlation increases with the collision energy. The correlation between net-proton and net-kaon multiplicity distributions is observed to be negative at \sNN~= 200 GeV and change to positive at the lowest collision energy. Model calculations based on non-thermal (UrQMD) and thermal (HRG) production of hadrons cannot explain the data. These measurements will help map the QCD phase diagram, constrain hadron resonance gas model calculations, and provide new insights on the energy dependence of baryon-strangeness correlations. An erratum has been added to address the issue of self-correlation in the previously considered efficiency correction for off-diagonal cumulant measurement. Previously considered unidentified (net-)charge correlation results (${\sigma }_{Q,p}^{11}$ and ${\sigma }_{Q,k}^{11})$ are now replaced with identified (net-)charge correlation (${\sigma }_{Q^{PID},p}^{11}$ and ${\sigma }_{Q^{PID},k}^{11}$)

   nucl-exhep-exhep-phPRC(2019)·63 citations
2. 02*

   High Precision Measurement of Compton Scattering in the 5 GeV region

   P. Ambrozewicz🇺🇸 · L. Ye🇺🇸 · Y. Prok🇺🇸 · I. Larin🇷🇺 · A. Ahmidouch🇺🇸 · K. Baker🇺🇸 · V. Baturin🇺🇸 · L. Benton🇺🇸 · A. Bernstein🇺🇸 · V. Burkert🇺🇸 · E. Clinton🇺🇸 · P.L. Cole🇺🇸 and 85 other authors

   The cross section of atomic electron Compton scattering $\gamma +e\to {\gamma }^{\prime }+e^{\prime }$ was measured in the 4.40--5.475 GeV photon beam energy region by the {\em PrimEx} collaboration at Jefferson Lab with an accuracy of 2\% and less. The results are consistent with theoretical predictions that include next-to-leading order radiative corrections. The measurements provide the first high precision test of this elementary QED process at beam energies greater than 0.1 GeV.

   nucl-exhep-phnucl-thPLB(2019)·6 citations
3. 03*

   First Measurement of the Total Neutron Cross Section on Argon Between 100 and 800 MeV

   B. Bhandari🇺🇸 · J. Bian🇺🇸 · K. Bilton🇺🇸 · C. Callahan🇺🇸 · J. Chaves🇺🇸 · H. Chen🇺🇸 · D. Cline🇺🇸 · R. L. Cooper🇺🇸 · D. Danielson🇺🇸 · J. Danielson🇺🇸 · N. Dokania🇺🇸 · S. Elliott🇺🇸 and 64 other authors

   We report the first measurement of the neutron cross section on argon in the energy range of 100-800 MeV. The measurement was obtained with a 4.3-hour exposure of the Mini-CAPTAIN detector to the WNR/LANSCE beam at LANL. The total cross section is measured from the attenuation coefficient of the neutron flux as it traverses the liquid argon volume. A set of 2,631 candidate interactions is divided in bins of the neutron kinetic energy calculated from time-of-flight measurements. These interactions are reconstructed with custom-made algorithms specifically designed for the data in a time projection chamber the size of the Mini-CAPTAIN detector. The energy averaged cross section is $0.91\pm 0.10(stat.)\pm 0.09(sys.)\mathrm{barns}$. A comparison of the measured cross section is made to the GEANT4 and FLUKA event generator packages.

   ↳ hep-exnucl-exphysics.ins-detPRL(2019)·29 citations
4. 04*

   Opportunities for Nuclear Physics & Quantum Information Science

   Ian C. Cloët🇺🇸 · Matthew R. Dietrich🇺🇸 · John Arrington🇺🇸 · Alexei Bazavov🇺🇸 · Michael Bishof🇺🇸 · Adam Freese🇺🇸 · Alexey V. Gorshkov🇺🇸 · Anna Grassellino🇺🇸 · Kawtar Hafidi🇺🇸 · Zubin Jacob🇺🇸 · Michael McGuigan🇺🇸 · Yannick Meurice🇺🇸 and 14 other authors

   This whitepaper is an outcome of the workshop Intersections between Nuclear Physics and Quantum Information held at Argonne National Laboratory on 28-30 March 2018 [www.phy.anl.gov/npqi2018/]. The workshop brought together 116 national and international experts in nuclear physics and quantum information science to explore opportunities for the two fields to collaborate on topics of interest to the U.S. Department of Energy (DOE) Office of Science, Office of Nuclear Physics, and more broadly to U.S. society and industry. The workshop consisted of 22 invited and 10 contributed talks, as well as three panel discussion sessions. Topics discussed included quantum computation, quantum simulation, quantum sensing, nuclear physics detectors, nuclear many-body problem, entanglement at collider energies, and lattice gauge theories.

   ↳ nucl-thhep-exnucl-exphysics.atom-ph+148 citations
5. 05*

   Estimates of hyperon polarization in heavy-ion collisions at collision energies $\sqrt{s_{NN}}=$ 4--40 GeV

   Yu. B. Ivanov🇷🇺 · V. D. Toneev🇷🇺 · A. A. Soldatov🇷🇺

   Global polarization of $\Lambda$ and $\bar{\Lambda }$ hyperons in Au+Au collisions at collision energies $\sqrt{s_{NN}}=$ 4-40 GeV in the midrapidity region and total polarization, i.e. averaged over all rapidities, are studied within the scope of the thermodynamical approach. The relevant vorticity is simulated within the model of the three-fluid dynamics (3FD). It is found that the performed rough estimate of the global midrapidity polarization quite satisfactorily reproduces the experimental STAR data on the polarization, especially its collision-energy dependence. The total polarization increases with the collision energy rise, which is in contrast to the decrease of the midrapidity polarization. This suggests that at high collision energies the polarization reaches high values in fragmentation regions.

   ↳ nucl-thhep-phnucl-exPRC(2019)·72 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.