Tue·Jan 3, 2023Tuesday·January 3, 2023

1. 01*

   First Measurement of Neutron Birefringence in Polarized ${}^{129}$Xe and ${}^{131}$Xe Nuclei

   H. Lu🇺🇸 · M. J. Barlow🇬🇧 · D. Basler🇺🇸 · P. Gutfreund🇫🇷 · O. Holderer🇩🇪 · A. Ioffe🇩🇪 · S. Pasini🇩🇪 · P. Pistel🇩🇪 · Z. Salhi🇩🇪 · K. Zhernenkov🇩🇪 · B. M. Goodson🇺🇸 · W. M. Snow🇺🇸 · E. Babcock🇩🇪

   We present the first measurements of polarized neutron birefringence in transmission through nuclear-polarized ${}^{129}$Xe and ${}^{131}$Xe gas and determine the neutron incoherent scattering lengths $b_i{(}^{129}Xe)=0.186\pm (0.021{)}_{stat.}\pm (0.004{)}_{syst.}\text{ fm}$ and $b_i{(}^{131}Xe)=2.09\pm (0.29{)}_{stat.}\pm (0.12{)}_{syst.}\text{ fm}$ for the first time. These results determine the essential parameter needed for interpretation of spin-dependent neutron-scattering studies on polarized xenon ensembles, with possible future applications ranging from tests of time-reversal violation to mode-entangled neutron scattering experiments on nuclear-polarized systems.

   nucl-excond-mat.mtrl-scihep-exphysics.atom-ph+1PRC(2024)·3 citations
2. 02*

   How Do Constraints of Nuclear Symmetry Energy Reconcile with Different Models?

   Yingxun Zhang🇨🇳 · Yangyang Liu🇨🇳 · Yongjia Wang🇨🇳 · Qingfeng Li🇨🇳 · Zhuxia Li🇨🇳

   By simultaneously describing the data of isospin sensitive nucleonic flow and pion observables, such as $v_2^n/v_2^{ch}$ and ${\pi }^{-}/{\pi }^{+}$, with ultra-relativistic quantum molecular dynamics (UrQMD) model, we got the symmetry energy at flow and pion characteristic densities which are $S(1.2{\rho }_0)=34\pm 4$ MeV and $S(1.5{\rho }_0)=36\pm 8$ MeV. Within the uncertainties, the constraints of symmetry energy at characteristic densities are consistent with the previous constraints by using other transport models. The consistency suggests that the reliable constraints on symmetry energy should be presented at the characteristic density of isospin sensitive observables. By using the constraints of symmetry energy at two different characteristic densities, the extrapolated value of $L$ is provided. Within $2\sigma$ uncertainty, the extrapolated value of $L$ is in $5-70$ MeV which is consistent with the recent combination analysis from PREX-II and astrophyiscs data. Further, the calculations with the constrained parameter sets can describe the data of charged pion multiplicities from S$\pi$RIT collaboration.

   ↳ nucl-thnucl-ex2 citations
3. 03*

   Quarkonia production in ultra-peripheral PbPb collisions at LHCb

   Xiaolin Wang🇨🇳

   Measurements of coherent charmonium production cross sections together with their ratio in ultra-peripheral PbPb collisions are studied at a nucleon-nucleon centre-of-mass energy of $5.02\mathrm{TeV}$, the differential cross-sections are measured as a function of rapidity and transverse momentum, separately. The photo-production of \jpsi mesons at low transverse momentum is studied in peripheral PbPb collisions, which confirms coherent \jpsi production in hadronic collisions. These latest results significantly improve previous measurements and are compared with some theoretical predictions.

   ↳ hep-exnucl-exActa Phys.Polon.Supp.(2023)·1 citation
4. 04*

   Hydrodynamic model of heavy-ion collisions with low momentum components

   Akihiko Monnai🇯🇵

   Relativistic heavy-ion collisions suggest that low momentum regions of the observed particle spectra are thermal and hydrodynamic, while medium-high momentum regions are non-thermal and perturbative. In this study, I construct a hydrodynamic model of heavy-ion collisions by cutting off the medium-high momentum contributions and investigate the phenomenological consequences. Numerical simulations indicate that the temperature of the quark matter can be higher at earlier times owing to the modification of the equation of state. It is also suggested that direct photon elliptic flow can be sensitive to the momentum dependence of thermalization.

   ↳ nucl-thhep-phnucl-exJ.Phys.G(2023)·2 citations
5. 05*

   Tribaryons with lattice QCD and one-boson exchange potentials

   Tian-Wei Wu🇨🇳 · Si-Qiang Luo🇨🇳 · Ming-Zhu Liu🇨🇳 · Li-Sheng Geng🇨🇳 · Xiang Liu🇨🇳

   Motivated by the existence of two-body hadronic molecules composed of $\Omega \Omega$, ${\Omega }_{ccc}{\Omega }_{ccc}$ and ${\Omega }_{bbb}{\Omega }_{bbb}$ predicted by lattice QCD simulations, we use the Gaussian expansion method to investigate whether three-body systems composed of $\Omega \Omega \Omega$, ${\Omega }_{ccc}{\Omega }_{ccc}{\Omega }_{ccc}$ and ${\Omega }_{bbb}{\Omega }_{bbb}{\Omega }_{bbb}$ can bind with the two-body ${}^1{S}_0$ interactions provided by lattice QCD. Our results show that none of the three-body systems bind. On the other hand, we find that with the one-boson exchange potentials the $\Omega \Omega \Omega$ system develops a bound state, for which the ${}^5{S}_2$ interaction plays an important role. Our studies support the existence of the ${\frac{3}{2}}^{+}$ $\Omega \Omega \Omega$ bound state and the nonexistence of the ${\frac{3}{2}}^{+}$ ${\Omega }_{ccc}{\Omega }_{ccc}{\Omega }_{ccc}$ and ${\Omega }_{bbb}{\Omega }_{bbb}{\Omega }_{bbb}$ bound states, due to the suppressed ${}^5{S}_2$ interactions in heavier systems.

   ↳ hep-phhep-exhep-latnucl-ex+1PRD(2023)·5 citations
6. 06*

   Hyperon-nucleon interaction in chiral effective field theory at next-to-next-to-leading order

   Johann Haidenbauer🇩🇪 · Ulf-G. Meißner🇩🇪 · Andreas Nogga🇩🇪 · Hoai Le🇩🇪

   A hyperon-nucleon potential for the strangeness $S=-1$ sector ($\Lambda N$, $\Sigma N$) up to third order in the chiral expansion is presented. SU(3) flavor symmetry is imposed for constructing the interaction, however, the explicit SU(3) symmetry breaking by the physical masses of the pseudoscalar mesons and in the leading-order contact terms is taken into account. A novel regularization scheme is employed which has already been successfully used in studies of the nucleon-nucleon interaction within chiral effective field theory up to high orders. An excellent description of the low-energy $\Lambda p$, ${\Sigma }^{-}p$ and ${\Sigma }^{+}p$ scattering data is achieved. New data from J-PARC on angular distributions for the $\Sigma N$ channels are analyzed. Results for the hypertriton and $A=4$ hyper-nuclear separation energies are presented. An uncertainty estimate for the chiral expansion is performed for selected hyperon-nucleon observables.

   ↳ nucl-thhep-exhep-lathep-ph+1EPJA(2023)·71 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.