Fri·Sep 21, 2018Friday·September 21, 2018

1. 01*

   Bulk observables in the LHC 5.02 TeV Pb+Pb collisions within the integrated HydroKinetic Model

   V. M. Shapoval🇺🇦 · Yu. M. Sinyukov🇺🇦

   The paper is devoted to the description and prediction of various bulk observables in the Pb+Pb collisions at the LHC energy $\sqrt{s_{NN}}=5.02$ TeV within the integrated hydrokinetic model (iHKM). Sensitivity of the results to the choice of the appropriate model parameter values is also investigated. It is found that changing of the relaxation time and the rate of thermalization, which characterize the pre-thermal stage of the matter evolution, as well as switching to another equation of state at the hydrodynamic stage and the corresponding hadronization temperature, does not destroy the results, if simultaneously one provides an appropriate adjusting of the initial time for the superdense matter formation and related maximal initial energy density.

   ↳ hep-phnucl-exnucl-thPRC(2019)·17 citations
2. 02*

   New narrow nucleon resonances $N^{\ast }(1685)$ and $N^{\ast }(1726)$ within the chiral quark-soliton model

   Ghil-Seok Yang🇰🇷 · Hyun-Chul Kim🇰🇷

   We investigate the strong and radiative decay widths of the narrow nucleon resonances $N^{\ast }(1685)$ and $N^{\ast }(1726)$ within the framework of the SU(3) chiral quark-soliton model. All the relevant parameters are taken from those used to describe the properties of the baryon octet and decuplet in previous works. The masses of the antidecuplet nucleon and the eikosiheptaplet (27-plet) nucleon with spin 3/2 are determined respectively to be $(1690.2\pm 10.5)\mathrm{MeV}$ and $(1719.6\pm 7.4)\mathrm{MeV}$. The decay width for $N^{\ast }(1685)\to \eta +N$ is found to be approximately three times larger than that for $N^{\ast }(1685)\to \pi +N$. The width of the decay $N^{\ast }\left(1726\right)3/2^{+}\to \eta +N$ is even about 31 times larger than that of $N^{\ast }\left(1726\right)3/2^{+}\to \pi +N$. The ratio of the radiative decays for $N^{\ast }(1685)$ is obtained to be ${\Gamma }_{n{n}^{\ast }(1685)}/{\Gamma }_{p{p}^{\ast }(1685)}=8.62\pm 3.45$ which explains very well the neutron anomaly. In contrast, we find ${\Gamma }_{p{p}^{\ast }(1726)}/{\Gamma }_{n{n}^{\ast }(1726)}=3.72\pm 0.64$, which indicates that the production of $N^{\ast }(1726)$ is more likely to be observed in the proton channel. We also examined the decay modes of these narrow nucleon resonances with the strangeness hadrons involved.

   ↳ hep-phnucl-exnucl-thPTEP(2019)·6 citations
3. 03*

   Probing axial quark generalized parton distributions through exclusive photoproduction of a $\gamma {\pi }^{\pm }$ pair with a large invariant mass

   G.Duplančić🇭🇷 · K.Passek-Kumerički🇭🇷 · B.Pire🇫🇷 · L.Szymanowski🇵🇱 · S.Wallon🇫🇷

   Exclusive photoproduction of a $\gamma {\pi }^{\pm }$ pair in the kinematics where the pair has a large invariant mass and the final nucleon has a small transverse momentum is described in the collinear factorization framework. The scattering amplitude is calculated at leading order in ${\alpha }_s$ and the differential cross sections for the process are estimated in the kinematics of the JLab~12-GeV experiments. The order of magnitude of the predicted cross-sections seems sufficient for a dedicated experiment to be performed. The process turns out to be very sensitive to the axial generalized parton distribution combination ${\tilde{H}}_u-{\tilde{H}}_d$.

   ↳ hep-phhep-exnucl-exnucl-thJHEP(2018)·58 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.