Wed·May 9, 2018Wednesday·May 9, 2018

1. 01*

   Highlights from BNL and RHIC 2017

   M. J. Tannenbaum🇺🇸

   Highlights of news from Brookhaven National Laboratory (BNL) and results from the Relativistic Heavy Ion Collider (RHIC) in the period July 2016-2017 are presented. 2017 was the 70th birthday of Brookhaven National Laboratory which was built starting in 1947 on Camp Upton, a military base in 1917 for World War I and in September 1944 for World War II. Highlights in 70 years of research at BNL are presented, which include 6 Nobel Prizes as well as other important discoveries and inventions. RHIC is the world's only polarized proton collider and a review of the establishment of the Riken BNL Research Center with research focus on spiin physics at RHIC is presented. Discoveries at RHIC in Jet Quenching and the Quark Gluon Plasma are reviewed as well as new ideas on flow in small systems including a measurement of the vorticity of the QGP via polarization of $\Lambda$ hyperons. An attempt at measuring the transport coefficient $\hat{q}$ of the Quark Gluon Plasma from azimuthal broadening of high $p_T$ di-hadron pairs is presented.

   nucl-exhep-ex1 citation
2. 02*

   Search for the Chiral Magnetic Effect in Relativistic Heavy-Ion Collisions

   Jie Zhao🇺🇸

   Relativistic heavy-ion collisions provide an ideal environment to study the emergent phenomena in quantum chromodynamics (QCD). The chiral magnetic effect (CME) is one of the most interesting, arising from the topological charge fluctuations of QCD vacua, immersed in a strong magnetic field. Since the first measurement nearly a decade ago of the possibly CME-induced charge correlation, extensive studies have been devoted to background contributions to those measurements. Many new ideas and techniques have been developed to reduce or eliminate the backgrounds. This article reviews these developments and the overall progress in the search for the CME.

   nucl-exhep-exhep-phnucl-thInt.J.Mod.Phys.A(2018)·29 citations
3. 03*

   Creating small circular, elliptical, and triangular droplets of quark-gluon plasma

   C. Aidala · Y. Akiba · M. Alfred · V. Andrieux · K. Aoki · N. Apadula · H. Asano · C. Ayuso · B. Azmoun · V. Babintsev · A. Bagoly · N.S. Bandara and 309 other authors

   The experimental study of the collisions of heavy nuclei at relativistic energies has established the properties of the quark-gluon plasma (QGP), a state of hot, dense nuclear matter in which quarks and gluons are not bound into hadrons. In this state, matter behaves as a nearly inviscid fluid that efficiently translates initial spatial anisotropies into correlated momentum anisotropies among the produced particles, producing a common velocity field pattern known as collective flow. In recent years, comparable momentum anisotropies have been measured in small-system proton-proton ($p$$+$$p$) and proton-nucleus ($p$$+$$A$) collisions, despite expectations that the volume and lifetime of the medium produced would be too small to form a QGP. Here, we report on the observation of elliptic and triangular flow patterns of charged particles produced in proton-gold ($p$$+$Au), deuteron-gold ($d$$+$Au), and helium-gold (${}^3$He$+$Au) collisions at a nucleon-nucleon center-of-mass energy $\sqrt{s_{{}_{NN}}}$~=~200 GeV. The unique combination of three distinct initial geometries and two flow patterns provides unprecedented model discrimination. Hydrodynamical models, which include the formation of a short-lived QGP droplet, provide a simultaneous description of these measurements.

   nucl-exNat.Phys.(2019)·411 citations
4. 04*

   Description of neutron-rich odd-mass krypton isotopes within the interacting boson-fermion model based on the Gogny energy density functional

   K. Nomura🇫🇷 · R. Rodríguez-Guzmán🇰🇼 · L. M. Robledo🇪🇸

   The low-lying structure of neutron-rich odd-mass Kr isotopes is studied within the interacting boson-fermion model (IBFM) based on the Gogny-D1M energy density functional (EDF). The $(\beta ,\gamma )$-deformation energy surfaces, spherical single-particle energies and occupation probabilities of the odd-mass systems are obtained using the constrained Hartree-Fock-Bogoliubov (HFB) approximation. Those quantities are used as a microscopic input to determine most of the parameters of the IBFM Hamiltonian. The remaining parameters are specifically tailored to the experimental spectrum for each of the studied odd-mass nuclei. A gradual structural evolution is predicted for the odd-mass isotopes ${}^{87-95}$Kr as a function of the nucleon number which, agrees well with the gradual growth of collectivity observed experimentally in the neighboring even-even isotopes.

   ↳ nucl-thnucl-exPRC(2018)·11 citations
5. 05*

   The gluon and charm content of the deuteron

   Stanley J. Brodsky🇺🇸 · Kelly Yu-Ju Chiu🇺🇸 · Jean-Philippe Lansberg🇫🇷 · Nodoka Yamanaka🇫🇷

   We evaluate the frame-independent gluon and charm parton-distribution functions (PDFs) of the deuteron utilizing light-front quantization and the impulse approximation. We use a nuclear wave function obtained from solving the nonrelativistic Schroedinger equation with the realistic Argonne v18 nuclear force, which we fold with the proton PDF. The predicted gluon distribution in the deuteron (per nucleon) is a few percent smaller than that of the proton in the domain x_{bj} = Q^2 / (2 p_N \cdot q) \sim 0.4, whereas it is strongly enhanced for x_{bj} larger than 0.6. We discuss the applicability of our analysis and comment on how to extend it to the kinematic limit x_{bj} \to 2. We also analyze the charm distribution of the deuteron within the same approach by considering both the perturbatively and non-perturbatively generated (intrinsic) charm contributions. In particular, we note that the intrinsic-charm content in the deuteron will be enhanced due to 6-quark "hidden-color" QCD configurations.

   ↳ hep-phhep-exnucl-exnucl-thPLB(2018)·23 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.