Nuclear Theory·nucl-th

Thursday·December 13, 2018

4 papers—2 primary·2 cross-listed

03
Charmed baryons in nuclear matter
T. F. Caramés🇪🇸 · C. E. Fontoura🇧🇷 · G. Krein🇧🇷 · J. Vijande🇪🇸 · A. Valcarce🇪🇸
We study the temperature and baryon density dependence of the masses of the lightest charmed baryons $Λ_{c}$ , $Σ_{c}$ and $Σ_{c}^{*}$ . We also look at the effects of the temperature and baryon density on the binding energies of the $Λ_{c} N$ and $Λ_{c} Λ_{c}$ systems. Baryon masses and baryon-baryon interactions are evaluated within a chiral constituent quark model. Medium effects are incorporated in those parameters of the model related to the dynamical breaking of chiral symmetry, which are the masses of the constituent quarks, the $σ$ and $π$ meson masses, and quark-meson couplings. We find that while the in-medium $Λ_{c}$ mass decreases monotonically with temperature, those of $Σ_{c}$ and $Σ_{c}^{*}$ have a nonmonotonic dependence. These features can be understood in terms of a simple group theory analysis regarding the one-gluon exchange interaction in those hadrons. The in-medium $Λ_{c} N$ and $Λ_{c} Λ_{c}$ interactions are governed by a delicate balance involving a stronger attraction due to the decrease of the $σ$ meson mass, suppression of coupled-channel effects and lower thresholds, leading to shallow bound states with binding energies of a few~MeV. The $Λ_{c}$ baryon could possibly be bound to a large nucleus, in qualitative agreement with results based on relativistic mean field models or QCD sum rules. Ongoing experiments at RHIC or LHCb or the planned ones at FAIR and J-PARC may take advantage of the present results.
↳ hep-phhep-latnucl-thPRD(2018)·10 citations
04
Identified particle production in Xe+Xe collisions at $s_{NN}$ = 5.44 TeV using a multiphase transport model
Rutuparna Rath🇮🇳 · Sushanta Tripathy🇮🇳 · Raghunath Sahoo🇮🇳 · Sudipan De🇮🇳 · Mohammed Younus🇿🇦
Xe+Xe collisions at relativistic energies provide us with an opportunity to study a possible system with deconfined quarks and gluons, whose size is in between those produced by p+p and Pb+Pb collisions. In the present work, we have used AMPT transport model with nuclear deformation to study the identified particle production such as ( $π^{+} + π^{-}$ ), (K $^{+}$ +K $^{-}$ ), $K_{s}^{0}$ , (p+ $p ˉ$ ), $ϕ$ and ( $Λ + Λ ˉ$ ) in Xe+Xe collisions at $s_{NN}$ =5.44 TeV. We study the $p_{T}$ -spectra, integrated yield, $p_{T}$ -differential and $p_{T}$ -integrated particle ratios to ( $π^{+} + π^{-}$ ) and (K $^{+}$ +K $^{-}$ ) as a function of collision centrality. The particle ratios are focused on strange to non-strange ratios and baryon to meson ratios. The effect of deformations has also been highlighted by comparing our results to non-deformation case. We have also compared the results from AMPT string melting and AMPT default version to explore possible effects of coalescence mechanism. We observe that the differential particle ratios show strong dependence with centrality while the integrated particle ratios show no centrality dependence.We give thermal model estimation of chemical freeze-out temperature and the Boltzmann-Gibbs Blast Wave analysis of kinetic freeze-out temperature and collective radial flow in Xe+Xe collisions at $s_{NN}$ = 5.44 TeV.
↳ hep-phhep-exnucl-exnucl-thPRC(2019)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE

Charmed baryons in nuclear matter

Identified particle production in Xe+Xe collisions at sNN​​ = 5.44 TeV using a multiphase transport model

Affiliations

Identified particle production in Xe+Xe collisions at $s_{NN}$ = 5.44 TeV using a multiphase transport model