Tue·May 1, 2018Tuesday·May 1, 2018

1. 01*

   Investigation of the near-threshold cluster resonance in ${}^{14}\mathrm{C}$

   Hong-Liang Zang🇨🇳 · Yan-Lin Ye🇨🇳 · Zhi-Huan Li🇨🇳 · Jian-Song Wang🇨🇳 · Jian-Ling Lou🇨🇳 · Qi-Te Li🇨🇳 · Yu-Cheng Ge🇨🇳 · Xiao-Fei Yang🇨🇳 · Jing Li🇨🇳 · Wei Jiang🇨🇳 · Jun Feng🇨🇳 · Qiang Liu🇨🇳 and 17 other authors

   An experiment for $p{(}^{14}\mathrm{C}$,${}^{14}{\mathrm{C}}^{\ast }{\to }^{10}\mathrm{Be}+\alpha )p$ inelastic excitation and decay was performed in inverse kinematics at a beam energy of 25.3 MeV/u. A series of ${}^{14}\mathrm{C}$ excited states, including a new one at 18.3(1) MeV, were observed which decay to various states of the final nucleus of ${}^{10}\mathrm{Be}$. A specially designed telescope-system, installed around the zero degree, played an essential role in detecting the resonant states near the $\alpha$-separation threshold. A state at 14.1(1) MeV is clearly identified, being consistent with the predicted band-head of the molecular rotational band characterized by the $\pi$-bond linear-chain-configuration. Further clarification of the properties of this exotic state is suggested by using appropriate reaction tools.

   nucl-exCPC(2018)·13 citations
2. 02*

   Signatures of thermalized charm quarks in all charged flow observables

   Jacquelyn Noronha-Hostler🇺🇸 · Claudia Ratti🇺🇸

   A long standing question in the field of heavy-ion collisions is whether charm quarks are thermalized within the Quark Gluon Plasma. In recent years, progress in lattice QCD simulations has led to reliable results for the equation of state of a system of 2+1 flavors (up, down, and strange) and 2+1+1 flavors (up, down, strange, and charm). We find that the equation of state strongly affects differential flow harmonics and a preference is seen for thermalized charm quarks at the LHC. Predictions are also made for the event-plane correlations at RHIC AuAu $\sqrt{s_{NN}}=200$ GeV collisions, and the scaling of differential flow observables and factorization breaking for all charged particles at LHC PbPb $\sqrt{s_{NN}}=5.02$ TeV collisions compared to LHC XeXe $\sqrt{s_{NN}}=5.44$ TeV collisions, which could be useful in answering the question: are charm quarks thermalized?

   ↳ nucl-thhep-phnucl-ex4 citations
3. 03*

   Predictions for azimuthal anisotropy in Xe+Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV using a multiphase transport model

   Sushanta Tripathy🇮🇳 · Sudipan De🇮🇳 · Mohammed Younus🇮🇳 · Raghunath Sahoo🇮🇳

   Xe+Xe collision at relativistic energies may provide us with a partonic system whose size is approximately in between those produced by p+p and Pb+Pb collisions. The experimental results on anisotropic flow in Xe+Xe and Pb+Pb collisions should provide us with an opportunity to study system size dependence of $v_2$. In the present work, we have used AMPT transport model to calculate charged particles' $v_2$ for Xe+Xe collisions at $\sqrt{s_{NN}}$=5.44 TeV. We have also tried to demonstrate the no. of constituent quark, $N_q$, and $m_T$ scaling of the elliptic flow. We find that $n_q$ scaling of $v_2$ is not observed for the identified hadrons. The $v_2$ results from Xe+Xe collisions have also been compared to Pb+Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV. We find that flow of charged particles in (50-60)\% central collisions for Xenon nuclei is almost 30\% less than particle flow developed in lead ion collisions, implying the important role the system size play in development of particle collective motion in relativistic heavy ion collisions.

   ↳ hep-phhep-exnucl-exnucl-thPRC(2018)·23 citations
4. 04*

   Z+jet correlation with NLO-matched parton-shower and jet-medium interaction in high-energy nuclear collisions

   Shan-Liang Zhang🇨🇳 · Tan Luo🇨🇳 · Xin-Nian Wang🇨🇳 · Ben-Wei Zhang🇨🇳

   The impact of jet quenching on $Z^0$-tagged jets in relativistic heavy-ion collisions at the Large Hadron Collider (LHC) is investigated. We employ Sharpa Monte Carlo program that combines next-to-leading order matrix elements with matched resummation of parton shower to compute the initial $Z^0$+jet production. The Linear Boltzmann Transport (LBT) model is then used to simulate the propagation, energy attenuation of and medium response induced by jet partons in the quark-gluon plasma. With both higher-order corrections and matched soft/collinear radiation as well as a sophisticated treatment of parton energy loss and medium response in LBT, our numerical calculations can provide the best description so far of all available observables of $Z^0$+jet simultaneously in both p+p and Pb+Pb collisions, in particular, the shift of the distribution in transverse momentum asymmetry $x_{\mathrm{jZ}}=p_T^{\mathrm{jet}}/p_T^Z$, the modification of azimuthal angle correlation in $\Delta {\varphi }_{\mathrm{j}\mathrm{Z}}=|{\varphi }_{\mathrm{jet}}-{\varphi }_Z|$ and the overall suppression of average number of $Z^0$-tagged jets per boson $R_{\mathrm{jZ}}$ at $\sqrt{s}=5.02$ TeV as measured by the CMS experiment. We also show that higher-order corrections to $Z^0$+jet production play an indispensable role in understanding $Z^0$+jet azimuthal angle correlation at small and intermediate $\Delta {\varphi }_{\mathrm{jZ}}$, and momentum imbalance at small $x_{\mathrm{jZ}}$. Jet quenching of the sub-leading jets is shown to lead to suppression of $Z^0$+jet correlation at small azimuthal angle difference $\Delta {\varphi }_{\mathrm{jZ}}$ and at small $x_{\mathrm{jZ}}$.

   ↳ nucl-thhep-phnucl-exPRC(2018)·60 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.