Wed·Jun 13, 2018Wednesday·June 13, 2018

1. 01*

   Energy dependent chemical potentials of light particles and quarks from yield ratios of antiparticles to particles in high energy collisions

   Hai-Ling Lao🇨🇳 · Ya-Qin Gao🇨🇳 · Fu-Hu Liu🇨🇳

   We collect the yields of charged pions (${\pi }^{-}$ and ${\pi }^{+}$), charged kaons ($K^{-}$ and $K^{+}$), anti-protons ($\bar{p}$), and protons ($p$) produced in mid-rapidity interval (in most cases) in central gold-gold (Au-Au), central lead-lead (Pb-Pb), and inelastic or non-single-diffractive proton-proton ($pp$) collisions at different collision energies. The chemical potentials of light particles and quarks are extracted from the yield ratios, ${\pi }^{-}/{\pi }^{+}$, $K^{-}/K^{+}$, and $\bar{p}/p$, of antiparticles to particles over an energy range from a few GeV to above 10 TeV. At a few GeV ($\sim 4$ GeV), the chemical potentials show, and the yield ratios do not show, different trends comparing with those at other energies, though the limiting values of the chemical potentials and the yield ratios at very high energy are 0 and 1 respectively.

   ↳ hep-phhep-exnucl-exnucl-thUniverse(2019)·6 citations
2. 02*

   $\Omega (2012)$ through the looking glass of flavour SU(3)

   Maxim V. Polyakov🇷🇺 · Hyeon-Dong Son🇩🇪 · Bao-Dong Sun🇨🇳 · Asli Tandogan🇩🇪

   We perform the flavour $SU(3)$ analysis of the recently discovered $\Omega (2012)$ hyperon. We find that well known (four star) $\Delta (1700)$ resonance with quantum numbers of $J^P=3/2^{-}$ is a good candidate for the decuplet partner of $\Omega (2012)$ if the branching for the three-body decays of the latter is not too large $\le 70$\%. That implies that the quantum numbers of $\Omega (2012)$ are $I(J^P)=0(3/2^{-})$. The predictions for the properties of still missing $\Sigma$ and $\Xi$ decuplet members are made. We also discuss the implications of the $\overline{K}\Xi (1530)$ molecular picture of $\Omega (2012)$. Crucial experimental tests to distinguish various pictures of $\Omega (2012)$ are suggested.

   ↳ hep-phhep-exnucl-exPLB(2019)·43 citations
3. 03*

   Infrared Properties of Hadronic Structure of Nucleon in Neutron Beta Decays to Order O(\alpha/\pi) in Standard V - A Effective Theory with QED and Linear Sigma Model of Strong Low--Energy Interactions

   A. N. Ivanov🇦🇹 · R. Höllwieser🇦🇹 · N. I. Troitskaya🇦🇹 · M. Wellenzohn🇦🇹 · Ya. A. Berdnikov🇷🇺

   Within the standard V - A theory of weak interactions, Quantum Electrodynamics (QED) and the linear sigma-model (LsM) of strong low-energy hadronic interactions we analyse infrared properties of hadronic structure of the neutron and proton in the neutron beta decays to leading order in the large nucleon mass expansion. We confirm validity and high confidence level of contributions of hadronic structure of the nucleon to the radiative corrections, calculated by Sirlin (Phys. Rev. 164, 1767 (1967)) to leading order in the large nucleon mass expansion. At the level of order 10^{-5} relative to Sirlin's infrared divergent contribution to the neutron radiative beta decay (inner bremsstrahlung) we find an infrared divergent contribution, induced by hadronic structure of the nucleon through the one-pion-pole exchange, to the rate of the neutron lifetime from the neutron radiative beta decay, which should be cancelled by contributions of virtual photon exchanges to the neutron beta decay. Following Ivanov et al. 1805.09702 [hep-ph] we argue that a consistent analysis of such a cancellation may be carried out well in the combined quantum field theory including the Standard Electroweak Model (SEM) and the LsM of strong low-energy interactions, where the effective V - A hadron-lepton current-current vertex is caused by the W^- - electroweak-boson exchange.

   ↳ hep-phgr-qcnucl-exAIP Conf.Proc.(2015)·2 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.