Tue·Apr 18, 2017Tuesday·April 18, 2017

1. 01*

   PHENIX Overview

   D. McGlinchey (for the PHENIX Collaboration)🇺🇸

   These proceedings present highlighted results from PHENIX shown at the Quark Matter 2017 conference.

   nucl-exnucl-thNPA(2017)·3 citations
2. 02*

   PHENIX results on multiparticle correlations in small systems

   R. Belmont🇺🇸

   We present measurements of 2- and 4-particle correlations in d+Au collisions at four different center-of-mass energies: 200, 62.4, 39, and 19.6 GeV. The data were collected in 2016 by the PHENIX experiment at RHIC. The second Fourier coefficient $v_2$ of the particle azimuthal distributions is measured using the Q-cumulant method as a function of event multiplicity. The results give a strong indication of collective behavior down to the lowest energy.

   nucl-exNPA(2017)·7 citations
3. 03*

   Ultra-peripheral collisions and hadronic structure

   Spencer R. Klein🇺🇸

   Ultra-peripheral collisions are the energy frontier for photon-mediated interactions, reaching, at the Large Hadron Collider (LHC), $\gamma -p$ center of mass energies five to ten times higher than at HERA and reaching $\gamma \gamma$ energies higher than at LEP. Photoproduction of heavy quarkonium and dijets in $pp$ and $pA$ collisions probes the gluon distribution in protons at Bjorken-$x$ values down to $3\times 10^{-6}$, far smaller than can be otherwise studied. In $AA$ collisions, these reactions probe the gluon distributions in heavy ions, down to $x$ values of a few $10^{-5}$. Although more theoretical work is needed to nail down all of the uncertainties, inclusion of these data in current parton distribution function fits would greatly improve the accuracy of the gluon distributions at low Bjorken-$x$ and low/moderate $Q^2$. High-statistics ${\rho }^0$ data probe the spatial distribution of the interaction sites; the site distribution is given by the Fourier transform of $d\sigma /dt$. After introducing UPCs, this review presents recent measurements of dilepton production and light-by-light scattering and recent data on proton and heavy nuclei structure, emphasizing results presented at Quark Matter 2017 (QM2017).

   nucl-exhep-exhep-phNPA(2017)·29 citations
4. 04*

   PHENIX measurements of single electrons from charm and bottom decays at midrapidity in Au+Au collisions

   Kazuya Nagashima (for the PHENIX Collaboration)🇯🇵

   Heavy quarks (charm and bottom) are a sensitive probe of the Quark-Gluon Plasma (QGP) created in high-energy nuclear collisions. The modification of their phase-space in the QGP reflects the physical property of the QGP because they are generated in the early stage of collisions and subsequently propagate through the QGP. PHENIX has published the first measurement of the nuclear modification factors $R_{\mathrm{AA}}$ of separated charm and bottom hadron decay electrons in minimum bias Au+Au collisions at $\sqrt{s_{NN}}$ $=$ 200 GeV using the 2011 data set. In these proceedings, we present $R_{\mathrm{AA}}(c\to e)$ and $R_{\mathrm{AA}}(b\to e)$ in most central Au+Au collisions at $\sqrt{s_{NN}}$ $=$ 200 GeV using 1/8 of our large 2014-2016 data set.

   nucl-exNPA(2017)·15 citations
5. 05*

   Jet Measurements with Neutral and Di-jet Triggers in Central Au+Au Collisions at $\sqrt{s_{NN}}$ = 200 GeV with STAR

   Nihar Ranjan Sahoo (for the STAR Collaboration)🇺🇸

   We present two measurements related to jet production in p+p and central Au+Au collisions at $\sqrt{s_{NN}}$=200 GeV. Firstly, a study of semi-inclusive charged recoil jets coincident with high-${\mathrm{p}}_{\mathrm{T}}$ direct-photon and neutral pions, and secondly, the hadron correlations with respect to reconstructed di-jet triggers. Indication of medium effects is observed by comparing $\gamma$+jet and ${\pi }^0$+jet measurements. The di-jet+hadron study shows signs that the medium-induced modifications of an imbalanced set of di-jets with "hard cores" primarily affect the recoil jet.

   nucl-exhep-exhep-phnucl-thNPA(2017)·1 citation
6. 06*

   Giant Dipole Resonance studies in Ba isotopes at $\text{ E/A}\sim$ 5 MeV

   C. Ghosh🇮🇳 · A.K. Rhine Kumar🇮🇳 · Balaram Dey🇮🇳 · V. Nanal🇮🇳 · R.G. Pillay🇮🇳 · P. Arumugam🇮🇳 · K.V. Anoop🇮🇳 · N. Dokania🇮🇳 · Abhijit Garai🇮🇳 · Ghnashyam Gupta🇮🇳 · E.T. Mirgule🇮🇳 · G. Mishra🇮🇳 and 4 other authors

   Exclusive measurements of high energy $\gamma$-rays are performed in ${}^{124}\mathrm{Ba}$ and ${}^{136}\mathrm{Ba}$ at the same excitation energy ($\sim$ 49 MeV), to study properties of the giant dipole resonance (GDR) over a wider $N/Z$ range. The high energy $\gamma$-rays are measured in coincidence with the multiplicity of low energy $\gamma$-rays to disentangle the effect of temperature ($T$) and angular momentum ($J$). The GDR parameters are extracted employing a simulated Monte Carlo statistical model analysis. The observed $\gamma$-ray spectra of ${}^{124}\mathrm{Ba}$ can be explained with prolate deformation, whereas a single component Lorentzian function which corresponds to a spherical shape could explain the $\gamma$-ray spectra from ${}^{136}\mathrm{Ba}$. The observed GDR width in ${}^{136}\mathrm{Ba}$ is narrower compared to that of ${}^{124}\mathrm{Ba}$. The statistical model best fit GDR cross sections are found to be in good agreement with the thermal shape fluctuation model (TSFM) calculations. Further, it is shown that the variation of GDR width with $T$ is well reproduced by the TSFM calculations over the temperature range of 1.1--1.7MeV.

   nucl-exPRC(2017)·4 citations
7. 07*

   A Unified Description for Comprehensive Sets of Jet Energy Loss Observables with CUJET3

   Shuzhe Shi🇺🇸 · Jiechen Xu🇺🇸 · Jinfeng Liao🇺🇸 · Miklos Gyulassy🇺🇸

   Jet energy loss in heavy ion collisions, as quantified by the traditional observable of high $p_T$ hadron's nuclear modification factor $R_{AA}$, provides highly informative "imaging" of the hot medium created in heavy ion collisions. There are now comprehensive sets of available data, from average suppression to azimuthal anisotropy, from light to heavy flavors, from RHIC 200GeV to LHC 2.76TeV as well as 5.02TeV collisions. A unified description of such comprehensive data presents a stringent vetting of any viable model for jet quenching phenomenology. In this contribution we report such a systematic and successful test of CUJET3, a jet energy loss simulation framework built upon a nonperturbative microscopic model for the hot medium as a semi-quark-gluon-monopole plasma (sQGMP) which integrates two essential elements of confinement, i.e. the Polyakov-loop suppression of quarks/gluons and emergent magnetic monopoles.

   ↳ hep-phnucl-exnucl-thNPA(2017)·9 citations
8. 08*

   Event-by-event $v_n$ correlations of soft hadrons and heavy mesons in heavy ion collisions

   Caio A. G. Prado🇧🇷 · Jacquelyn Noronha-Hostler🇺🇸 · Roland Katz🇧🇷 · Jorge Noronha🇧🇷 · Marcelo G. Munhoz🇧🇷 · Alexandre A. P. Suaide🇧🇷

   Combining event-by-event hydrodynamics with heavy quark energy loss we compute correlations between the heavy and soft sectors for elliptic and triangular flow harmonics $v_2$ and $v_3$ of D${}^0$ mesons in PbPb collisions at $2.76$ TeV and $5.02$ TeV. Our results indicate that $v_3$ is strongly influenced by the fragmentation temperature and that it builds up later than $v_2$ during the evolution of the system.

   ↳ nucl-thhep-phnucl-exNPA(2017)·2 citations
9. 09*

   Bulk viscous effects on flow and dilepton radiation in a hybrid approach

   Gojko Vujanovic🇺🇸 · Jean-François Paquet🇺🇸 · Sangwook Ryu🇩🇪 · Chun Shen🇺🇸 · Gabriel S. Denicol🇧🇷 · Sangyong Jeon🇨🇦 · Charles Gale🇨🇦 · Ulrich Heinz🇺🇸

   Starting from IP-Glasma initial conditions, we investigate the effects of bulk pressure on low mass dilepton production at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC) energies. Though thermal dilepton $v_2$ is affected by the presence of both bulk and shear viscosity, whether or not these effects can be measured depends on the dilepton "cocktail" contribution to the the low mass dilepton $v_2$. Combining the thermal and "cocktail" dileptons, the effects of bulk viscosity on total dilepton $v_2$ is investigated.

   ↳ nucl-thhep-phnucl-exNPA(2017)·6 citations
10. 10*

    Nonstandard interactions in solar neutrino oscillations with Hyper-Kamiokande and JUNO

    Jiajun Liao🇺🇸 · Danny Marfatia🇺🇸 · Kerry Whisnant🇺🇸

    Measurements of the solar neutrino mass-squared difference from KamLAND and solar neutrino data are somewhat discrepant, perhaps due to nonstandard neutrino interactions in matter. We show that the zenith angle distribution of solar neutrinos at Hyper-Kamiokande and the energy spectrum of reactor antineutrinos at JUNO can conclusively confirm the discrepancy and detect new neutrino interactions.

    ↳ hep-phastro-ph.SRhep-exnucl-exPLB(2017)·40 citations
11. 11*

    Single spin asymmetries in forward p-p/A collisions revisited: the role of color entanglement

    Jian Zhou🇨🇳

    We calculate the single transverse spin asymmetries(SSA) for forward inclusive particle production in pp and pA collisions using a hybrid approach. It is shown that the Sivers type contribution to the SSA drops out due to color entanglement effect, whereas the fragmentation contribution to the spin asymmetry is not affected by color entanglement effect. This finding offers a natural solution for the sign mismatch problem.

    ↳ hep-phnucl-exPRD(2017)·9 citations
12. 12*

    Properties and uses of factorial cumulants in relativistic heavy-ion collisions

    Masakiyo Kitazawa🇯🇵 · Xiaofeng Luo🇨🇳

    We discuss properties and applications of factorial cumulants of various particle numbers and for their mixed channels measured by the event-by-event analysis in relativistic heavy-ion collisions. After defining the factorial cumulants for systems with multi-particle species, their properties are elucidated. The uses of the factorial cumulants in the study of critical fluctuations are discussed. We point out that factorial cumulants play useful roles in understanding fluctuation observables when they have underlying physics approximately described by the binomial distribution. As examples, we suggest novel utilization methods of the factorial cumulants in the study of the momentum cut and rapidity window dependences of fluctuation observables.

    ↳ nucl-thhep-phnucl-exPRC(2017)·50 citations
13. 13*

    Chemical freeze-out in relativistic heavy-ion collisions

    Jun Xu🇨🇳 · Che Ming Ko🇺🇸

    One surprising result in relativistic heavy-ion collisions is that the abundance of various particles measured in experiments is consistent with the picture that they reach chemical equilibrium at a temperature much higher than the temperature they freeze out kinetically. Using a multiphase transport model to study particle production in these collisions, we find that the above result is due to the constancy of the entropy per particle during the evolution of the hadronic matter from the chemical to the kinetic freeze-out. We further use a hadron resonance gas model to illustrate the result from the transport model study.

    ↳ nucl-thhep-exnucl-exPLB(2017)·37 citations
14. 14*

    Mixed Harmonic Correlations: Hydrodynamics Predictions at RHIC using Experimental Analysis Techniques

    Fernando G. Gardim🇧🇷 · Frederique Grassi🇧🇷 · Matthew Luzum🇧🇷 · Jacquelyn Noronha-Hostler🇺🇸

    Correlations of different azimuthal flow harmonics $v_n$ and symmetry planes ${\Psi }_n$ can add constraints to theoretical models, and probe aspects of the system that are independent of the traditional single-harmonic measurements. Using NeXSPheRIO, a hydrodynamical model which has accurately reproduced a large set of single-harmonic correlations at RHIC, we make predictions of these new observables for 200 A GeV Au+Au Collisions, providing an important baseline for comparison to correlations of flow harmonics, which contain non-trivial information about the initial state. We also point out how to properly compare theoretical calculations to measurements using wide centrality bins and non-trivial event weighting.

    ↳ nucl-thhep-phnucl-exNPA(2017)·0 citations
15. 15*

    Searches for Double Beta Decay of ${}^{134}$Xe with EXO-200

    EXO-200 Collaboration: J.B. Albert🇺🇸 · G. Anton🇩🇪 · I. Badhrees🇺🇸 · P.S. Barbeau🇺🇸 · R. Bayerlein🇩🇪 · D. Beck🇺🇸 · V. Belov🇷🇺 · M. Breidenbach🇺🇸 · T. Brunner🇨🇦 · G.F. Cao🇨🇳 · W.R. Cen🇨🇳 · C. Chambers🇺🇸 and 80 other authors

    Searches for double beta decay of ${}^{134}$Xe were performed with EXO-200, a single-phase liquid xenon detector designed to search for neutrinoless double beta decay of ${}^{136}$Xe. Using an exposure of $29.6\text{ kg}\cdot \text{yr}$, the lower limits of ${\text{T}}_{1/2}^{2\nu \beta \beta }>8.7\cdot 10^{20}\text{ yr}$ and ${\text{T}}_{1/2}^{0\nu \beta \beta }>1.1\cdot 10^{23}\text{ yr}$ at 90% confidence level were derived, with corresponding half-life sensitivities of $1.2\cdot 10^{21}\text{ yr}$ and $1.9\cdot 10^{23}\text{ yr}$. These limits exceed those in the literature for ${}^{134}$Xe, improving by factors of nearly $10^5$ and 2 for the two antineutrino and neutrinoless modes, respectively.

    ↳ hep-exnucl-exPRD(2017)·32 citations
16. 16*

    Chiral Vortical and Magnetic Effects in Anomalous Hydrodynamics

    Xingyu Guo🇨🇳 · Dmitri E. Kharzeev🇺🇸 · Xu-Guang Huang🇨🇳 · Wei-Tian Deng🇨🇳 · Yuji Hirono🇺🇸

    We employ a 3+1D anomalous hydrodynamics with initial condition generated by HIJING to simulate the chiral vortical effect and the chiral magnetic effect in heavy-ion collisions. This allows us to calculate the charge-dependent two-particle correlations with respect to the reaction plane at different collision energies and centralities. We then compare the computed results with the experimental data and give discussions on the possible background effects.

    ↳ nucl-thhep-phnucl-exNPA(2017)·10 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.