Mon·Jan 2, 2023Monday·January 2, 2023

1. 01*

   Letter of Intent: the NA60+ experiment

   C. Ahdida🇨🇭 · G. Alocco🇮🇹 · F. Antinori🇮🇹 · M. Arba🇮🇹 · M. Aresti🇮🇹 · R. Arnaldi🇮🇹 · A. Baratto Roldan🇨🇭 · S. Beole🇮🇹 · A. Beraudo🇮🇹 · J. Bernhard🇨🇭 · L. Bianchi🇮🇹 · M. Borysova🇮🇱 and 50 other authors

   We propose a new fixed-target experiment for the study of electromagnetic and hard probes of the Quark-Gluon Plasma (QGP) in heavy-ion collisions at the CERN SPS. The experiment aims at performing measurements of the dimuon spectrum from threshold up to the charmonium region, and of hadronic decays of charm and strange hadrons. It is based on a muon spectrometer, which includes a toroidal magnet and six planes of tracking detectors, coupled to a vertex spectrometer, equipped with Si MAPS immersed in a dipole field. High luminosity is an essential requirement for the experiment, with the goal of taking data with 10${}^6$ incident ions/s, at collision energies ranging from $\sqrt{s_{\mathrm{NN}}}=6.3$ GeV ($E_{\mathrm{lab}}=20$ A GeV) to top SPS energy ($\sqrt{s_{\mathrm{NN}}}=17.3$ GeV, $E_{\mathrm{lab}}=158$ A GeV). This document presents the physics motivation, the foreseen experimental set-up including integration and radioprotection studies, the current detector choices together with the status of the corresponding R&D, and the outcome of physics performance studies. A preliminary cost evaluation is also carried out.

   nucl-exphysics.ins-det28 citations
2. 02*

   Light Nuclei and Hyper Nuclei Collectivity Measurements at High Baryon Density Region

   Xionghong He🇨🇳

   High energy heavy-ion collisions produce large amounts of light nuclei and hype nuclei, especially at high baryon density around collision energy of several GeV. These light nuclei and hyper nuclei carry the information of nucleon-nucleon and hyperon-nucleon interactions and affect the chemical composition and properties of the collision system. This proceeding is a brief review for the recent measurements on light nuclei collective flow, including directed flow $v_1$, elliptic flow $v_2$, and high order flow coefficients, at finite and high baryon densities from different experiments. The light nuclei production mechanism is discussed based on comparisons of the measurements and model calculations. The first measurement for hyper nuclei $v_1$ at 3 GeV by STAR is also reported, which may imply the hyper nuclei are formed via the coalescence of nucleons and hyperon.

   nucl-exEPJ Web Conf.(2023)·1 citation
3. 03*

   Spin-1 quarkonia in a rotating frame and their spin contents

   HyungJoo Kim🇰🇷 · Sungtae Cho🇰🇷 · Su Houng Lee🇰🇷

   We propose a new way of studying the spin content of a hadron by looking at its response in a rotating frame. By collecting all responses of quarks and gluons in a rotating frame, we describe the spin-rotation coupling of spin-1 quarkonia and thereby reveal their spin contents in a relativistic formalism. We demonstrate that both the perturbative and non-perturbative contributions in the operator product expansion follow a universal formula that identifies the spin-rotation coupling with unit strength. This allows us to recognize the total spin-1 of the vector and axial vector quarkonia in terms of the total angular momentum of quarks and gluons. Specifically, we find the spin contents of $J/\psi$, ${\chi }_{c1}$, ${\rm Y}(1S)$, and ${\chi }_{b1}$ are slightly different from the naive quark model picture. For example, the $J/\psi$ is traditionally considered as an S-wave particle, but we find quarks do not carry all of the total spin.

   ↳ hep-phhep-exnucl-exnucl-thPLB(2023)·6 citations
4. 04*

   Relativistic approach to the nuclear breathing mode

   Elena Litvinova🇺🇸

   Microscopic theory of the nuclear response based on the relativistic meson-nucleon Lagrangian is applied to the description of the isoscalar giant monopole resonance (ISGMR) in a variety of nuclear systems. It is shown that the parameter-free inclusion of beyond-mean-field correlations of the quasiparticle-vibration coupling (qPVC) type in the leading approximation allows for a simultaneous realistic description of the ISGMR in nuclei of lead, tin, zirconium, and nickel mass regions, which is difficult on the mean-field level. The calculations employ the finite-range effective meson-nucleon interaction, which, in combination with the qPVC, has consistently demonstrated the ability to reliably describe many other nuclear structure phenomena. Systematic calculations of the isoscalar monopole response for nickel isotopes help reveal the central role of the coupling between the ISGMR and the low-energy quadrupole states in the placement of the ISGMR centroids.

   ↳ nucl-thastro-ph.SRnucl-exPRC(2023)·27 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.