Thu·Nov 29, 2018Thursday·November 29, 2018

1. 01*

   Thermal Production of Charmonia at the LHC Energies

   Baoyi Chen🇨🇳

   This work studies the thermal production of $J/\psi$ and $\psi (2S)$ with Boltzmann transport model in the Quark Gluon Plasma (QGP) produced in $\sqrt{s_{NN}}=5.02$ TeV Pb-Pb collisions. $J/\psi$ nuclear modification factors are studied in details with the mechanisms of primordial production and the recombination of charm and anti-charm quarks in the thermal medium. $\psi (2S)$ binding energy is much smaller in the hot medium compared with the ground state, so $\psi (2S)$ with middle and low $p_T$ can be mainly thermally regenerated in the later stage of QGP expansions which enables $\psi (2S)$ inherit larger collective flows from the bulk medium. We quantitatively study both nuclear modification factors of $J/\psi$ and $\psi (2S)$ in different centralities and transverse momentum bins in $\sqrt{s_{NN}}=5.02$ TeV Pb-Pb collisions.

   ↳ nucl-thnucl-exCPC(2019)·38 citations
2. 02*

   Gaussian-distribution analysis of transverse momentum spectra of K_0^S and K^(*0) in 200 GeV collisions

   Zhi-hao Pan🇨🇳 · Si-you Guo🇨🇳 · B. C. Li🇨🇳

   In this paper, we use the Gaussian distribution to analyze transverse momentum spectra of K_0^S and K^(*0) at midrapidity in d +Au, Cu+Cu and p+p Collisions at 200 GeV. The two-component Gaussian distribution can approximately agree with the experimental data and the three-component distribution can perfectly agree with the data in the given range. Moreover, there is a significantly positive correlation between the temperature and the collision centrality.

   ↳ nucl-thnucl-ex0 citations
3. 03*

   ANNI - A pulsed cold neutron beam facility for particle physics at the ESS

   Torsten Soldner🇫🇷 · Hartmut Abele🇦🇹 · Gertrud Konrad🇦🇹 · Bastian Märkisch🇩🇪 · Florian M. Piegsa🇨🇭 · Ulrich Schmidt🇩🇪 · Camille Theroine🇫🇷 · Pablo Torres Sánchez🇫🇷

   Pulsed beams have tremendous advantages for precision experiments with cold neutrons. In order to minimise and measure systematic effects, they are used at continuous sources in spite of the related substantial decrease in intensity. At the European Spallation Source ESS these experiments will profit from the pulse structure of the source and its 50 times higher peak brightness compared to the most intense reactor facilities, making novel concepts feasible. Therefore, the cold neutron beam facility for particle physics ANNI was proposed as part of the ESS instrument suite. The proposed design has been re-optimised to take into account the present ESS cold moderator layout. We present design considerations, the optimised instrument parameters and performance, and expected gain factors for several reference experiments.

   ↳ physics.ins-detnucl-exEPJ Web Conf.(2019)·25 citations
4. 04*

   Realization of a Large-Acceptance Faraday Cup for 3 MeV Electrons

   R. Johnston🇺🇸 · J. Bernauer🇺🇸 · C. M. Cooke · R. Corliss🇺🇸 · C. S. Epstein🇺🇸 · P. Fisher🇺🇸 · I. Friščić🇭🇷 · D. Hasell🇺🇸 · E. Ihloff🇺🇸 · J. Kelsey🇺🇸 · S. Lee🇺🇸 · R. G. Milner🇺🇸 and 3 other authors

   The design, construction, installation, and testing of a Faraday Cup intended to measure the current of a 3 MeV, 1 microampere electron beam is described. Built as a current monitor for a Møller scattering measurement at the MIT High Voltage Research Laboratory, the device combines a large angular acceptance with the capability to measure a continuous, low energy beam. Bench studies of its performance demonstrate current measurements accurate to the percent level at 1 microampere. The Faraday Cup was designed and constructed at MIT and has been in use at the HVRL since 2017, providing a significantly more detailed measurement of beam current than was previously available.

   ↳ physics.ins-detnucl-exphysics.acc-phNucl.Instrum.Meth.A(2019)·1 citation

* 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.