Wed·Sep 26, 2018Wednesday·September 26, 2018

1. 01*

   Event-shape engineering for the D-meson elliptic flow in mid-central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV

   ALICE Collaboration

   The production yield of prompt D mesons and their elliptic flow coefficient $v_2$ were measured with the Event-Shape Engineering (ESE) technique applied to mid-central (10-30% and 30-50% centrality classes) Pb-Pb collisions at the centre-of-mass energy per nucleon pair $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV, with the ALICE detector at the LHC. The ESE technique allows the classification of events, belonging to the same centrality, according to the azimuthal anisotropy of soft particle production in the collision. The reported measurements give the opportunity to investigate the dynamics of charm quarks in the Quark-Gluon Plasma and provide information on their participation in the collective expansion of the medium. D mesons were reconstructed via their hadronic decays at mid-rapidity, $|\eta |<0.8$, in the transverse momentum interval $1<p_{\mathrm{T}}<24$ GeV/$c$. The $v_2$ coefficient is found to be sensitive to the event-shape selection confirming a correlation between the D-meson azimuthal anisotropy and the collective expansion of the bulk matter, while the per-event D-meson yields do not show any significant modification within the current uncertainties.

   nucl-exhep-exJHEP(2019)·54 citations
2. 02*

   Three dimensional Lévy HBT results from PHENIX

   Bálint Kurgyis (for the PHENIX Collaboration)🇭🇺

   In heavy-ion collisions we measure the Bose-Einstein correlation functions to map out the femtoscopic homogeneity region of the particle emitting source. Previously, a one dimensional measurement with a Lévy shaped source was done at the PHENIX experiment. In this paper, we present the three dimensional Lévy HBT results of PHENIX and their comparison with the one dimensional results.

   nucl-exActa Phys. Pol. B Proc. Suppl. vol. 12 (2…·12 citations
3. 03*

   Deuteron photodisintegration by polarized photons in the region of the $d^{\ast }(2380)$

   M. Bashkanov🇬🇧 · S. Kay🇨🇦 · D.P. Watts🇬🇧 · C. Mullen🇬🇧 · S. Abt🇨🇭 · P. Achenbach🇩🇪 · P. Adlarson🇩🇪 · F. Afzal🇩🇪 · Z. Ahmed🇨🇦 · C.S. Akondi🇺🇸 · J.R.M. Annand🇬🇧 · H.J. Arends🇩🇪 and 61 other authors

   We report the first large-acceptance measurement of the beam-spin asymmetry for deuteron photodisintegration ($\vec{\gamma }d\to pn$) in the photon energy range $400<E_{\gamma }<630$~MeV. The measurement provides important new constraints on the mechanisms of photodisintegration above the delta resonance and on the photocoupling of the recently discovered $d^{\ast }(2380)$ hexaquark.

   nucl-exPLB(2019)·27 citations
4. 04*

   Multipole sensitivity to phase variation in pion photo-and electroproduction analyses

   L. Markou🇨🇾 · E. Stiliaris🇬🇷 · C. N. Papanicolas🇨🇾

   We use the Athens Model Independent Analysis Scheme (AMIAS) to examine the validity of using the Fermi-Watson theorem in the multipole analyses of pion photoproduction and electroproduction data. A standard practice in this field is to fix the multipoles' phases from $\pi N$ scattering data, making use of the Fermi - Watson theorem. However, these phases are known with limited accuracy and the effect of this uncertainty on the obtained multipole extraction has not been fully explored yet. Using AMIAS we constrain the phases within their experimentally determined uncertainty. We first analyze sets of pseudodata of increasing statistical precision and subsequently we apply the methodology for a re-analysis of the Bates/Mainz electroproduction data. It is found that the uncertainty induced by the $\pi N$ phases uncertainty to the extracted solutions would be significant only in the analysis of data with much higher precision than the current available experimental data.

   nucl-exnucl-thEPJA(2020)·0 citations
5. 05*

   Energy and system size dependent heavy flavor measurements at PHENIX at RHIC

   Xuan Li (for the PHENIX collaboration)🇺🇸

   Heavy flavor production is an ideal tool to study the properties of the Quark Gluon Plasma (QGP). The heavy flavor production at the Relativistic Heavy Ion Collider (RHIC) has its unique kinematic coverage and different production mechanisms from the Larger Hadron Collider (LHC) measurements. Heavy flavor products created in heavy ion collisions experience the whole evolution of nuclear medium. It's critical to measure both open and closed heavy flavor products in different collision systems to isolate cold/hot nuclear medium effects and initial/final state interactions. We report recent heavy flavor measurements at PHENIX in 200 GeV $p$+$p$, $p$+Al, $p$+Au, ${}^3$He+Au and Au+Au collisions that include: the correlated di-muon analysis in 200 GeV $p$+$p$ and $p$+Au collisions; the rapidity and $N_{part}$ dependent $J/\psi$ $R_{AB}$ measured in asymmetric small systems; open heavy flavor $v_2$ measured in 200 GeV d+Au and Au+Au collisions. These measurements provide further information about the heavy flavor production mechanism, initial and final state nuclear modification and flavor dependent energy loss in QGP.

   ↳ hep-exnucl-ex0 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.