Nuclear Theory·nucl-th

Thursday·May 19, 2016

9 papers—6 primary·3 cross-listed

07
[Submitted on 15 May 2016] (cross-list from hep-th)
From Inverse to Delayed Magnetic Catalysis in Strong Magnetic Field
Shijun Mao🇨🇳
We study magnetic field effect on chiral phase transition in a Nambu--Jona-Lasinio model. In comparison with mean field approximation containing quarks only, including mesons as quantum fluctuations in the model leads to a transition from inverse to delayed magnetic catalysis at finite temperature and delays the transition at finite baryon chemical potential. The location of the critical end point depends on the the magnetic field non-monotonously.
Comments:
5 pages, 5 figs
Subjects:
High Energy Physics — Theory (hep-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1605.04526 [pdf]
PRD(2016)·36 citations
08
[Submitted on 18 May 2016] (cross-list from hep-ph)
Scalar and vector self-energies of heavy baryons in nuclear medium
K. Azizi🇹🇷 · N. Er🇹🇷 · H. Sundu🇹🇷
The in-medium sum rules are employed to calculate the shifts in the mass and residue as well as the scalar and vector self-energies of the heavy $Λ_{Q}, Σ_{Q}$ and $Ξ_{Q}$ baryons, with Q being $b$ or $c$ quark. The maximum shift in mass due to nuclear matter belongs to the $Σ_{c}$ baryon and it is found to be $Δ m_{Σ_{c}} = - 936 M e V$ . In the case of residue, it is obtained that the residue of $Σ_{b}$ baryon is maximally affected by the nuclear medium with the shift $Δ λ_{Σ_{b}} = - 0.014 G e V^{3}$ . The scalar and vector self-energies are found to be $Σ_{Λ_{b}}^{S} = 653 M e V$ , $Σ_{Σ_{b}}^{S} = - 614 M e V$ , $Σ_{Ξ_{b}}^{S} = - 17 M e V$ , $Σ_{Λ_{c}}^{S} = 272 M e V$ , $Σ_{Σ_{c}}^{S} = - 936 M e V$ , $Σ_{Ξ_{c}}^{S} = - 5 M e V$ and $Σ_{Λ_{b}}^{ν} = 436 \pm 148 M e V$ , $Σ_{Σ_{b}}^{ν} = 382 \pm 129 M e V$ , $Σ_{Ξ_{b}}^{ν} = 15 \pm 5 M e V$ , $Σ_{Λ_{c}}^{ν} = 151 \pm 45 M e V$ , $Σ_{Σ_{c}}^{ν} = 486 \pm 144 M e V$ and $Σ_{Ξ_{c}}^{ν} = 1.391 \pm 0.529 M e V$ .
Comments:
13 Pages, 11 Figures and 5 Tables
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1605.05535 [pdf]
NPA(2017)·20 citations
09
[Submitted on 18 May 2016] (cross-list from hep-ph)
Forward $J / ψ$ production at high energy: centrality dependence and mean transverse momentum
B. Ducloué🇫🇮 · T. Lappi🇫🇮 · H. Mäntysaari🇺🇸
Forward rapidity $J / ψ$ meson production in proton-nucleus collisions can be an important constraint of descriptions of the small- $x$ nuclear wavefunction. In an earlier work we studied this process using a dipole cross section satisfying the Balitsky-Kovchegov equation, fit to HERA inclusive data and consistently extrapolated to the nuclear case using a standard Woods-Saxon distribution. In this paper we present further calculations of these cross sections, studying the mean transverse momentum of the meson and the dependence on collision centrality. We also extend the calculation to backward rapidities using nuclear parton distribution functions. We show that the parametrization is overall rather consistent with the available experimental data. However, there is a tendency towards a too strong centrality dependence. This can be traced back to the rather small transverse area occupied by small- $x$ gluons in the nucleon that is seen in the HERA data, compared to the total inelastic nucleon-nucleon cross section.
Comments:
11 pages, 10 figures. v2: numerical error corrected, Figs 2 and 10 revised
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1605.05680 [pdf]
PRD(2016)·51 citations

Affiliations

first authorsco-authorsvia INSPIRE

From Inverse to Delayed Magnetic Catalysis in Strong Magnetic Field

Scalar and vector self-energies of heavy baryons in nuclear medium

Forward J/ψ production at high energy: centrality dependence and mean transverse momentum

Affiliations

Forward $J / ψ$ production at high energy: centrality dependence and mean transverse momentum