Nuclear Theory·nucl-th

Tuesday·January 16, 2018

14 papers—9 primary·5 cross-listed

10
[Submitted on 13 Jan 2018] (cross-list from hep-ph)
Transport coefficients in the Polyakov quark meson coupling model: A quasi particle approach
Aman Abhishek🇮🇳 · Sabyasachi Ghosh🇮🇳 · Hiranmaya Mishra🇮🇳
We compute the transport coefficients, namely, the coefficients of shear and bulk viscosities as well as thermal conductivity for hot and dense matter. The calculations are performed within the Polyakov loop extended quark meson model. The estimation of the transport coefficients is made using the Boltzmann kinetic equation within the relaxation time approximation. The energy dependent relaxation time is estimated from meson meson scattering, quark meson scattering and quark quark scattering within the model. In our calculations, the shear viscosity to entropy ratio and the coefficient of thermal conductivity show a minimum at the critical temperature, while the ratio of bulk viscosity to entropy density exhibits a peak at this transition point. The effect of confinement modelled through a Polyakov loop potential plays an important role in the estimation of these dissipative coefficients both below and above the critical temperature.
Comments:
To appear in Proceedings of Sciences, CPOD 2017. arXiv admin note: substantial text overlap with arXiv:1709.08013
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1801.04393 [pdf]
PoS(2018)·1 citation
11
[Submitted on 14 Jan 2018] (cross-list from hep-ph)
Surveying exotic pentaquarks with the typical $QQq q q ˉ$ configuration
Qin-Song Zhou🇨🇳 · Kan Chen🇨🇳 · Xiang Liu🇨🇳 · Yan-Rui Liu🇨🇳 · Shi-Lin Zhu🇨🇳
As a hot issue, exploring exotic pentaquarks is full of challenges and opportunities for both theorist and experimentalist. In this work, we focus on a type of pentaquark with the $QQq q q ˉ$ ( $Q = b, c$ ; $q = u, d, s$ ) configuration, where their mass spectrum is estimated systematically. Especially, our result indicates that there may exist some stable or narrow exotic pentaquark states. Obviously, our study may provides valuable information for further experimental search for the $QQq q q ˉ$ pentaquarks. With the running of LHCb and forthcoming Belle II, we have a reason to believe that these predictions present here can be tested.
Comments:
21 pages, 5 figures, 10 tables. Accepted by Phys. Rev. C
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
1801.04557 [pdf]
PRC(2018)·51 citations
12
[Submitted on 15 Jan 2018] (cross-list from hep-ph)
On the form factors of $d^{*} (2380)$
Yubing Dong🇨🇳 · Pengnian Shen🇨🇳 · Zongye Zhang🇨🇳
In order to explore the possible physical quantities for judging different structures of the newly observed resonance $d^{*} (2380)$ , we study its electromagnetic form factors. In addition to the electric charge monopole $C 0$ , we calculate its electric quadrupole $E 2$ , magnetic dipole $M 1$ , and six-pole $M 3$ form factors on the base of the realistic coupled $ΔΔ + C C$ channel $d^{*}$ wave function with both the $S$ - and $D$ -partial waves. The results show that the magnetic dipole moment and electric quadrupole deformation of $d^{*}$ are 7.602 and $2.53 \times 1 0^{- 2} fm^{2}$ , respectively. The calculated magnetic dipole moment in the naive constituent quark model is also compared with the result of $D_{12} π$ picture. By comparing with partial results where the $d^{*}$ state is considered with a single $ΔΔ$ and with a $D_{12} π$ structures, we find that in addition to the charge distribution of $d^{*} (2380)$ , the magnetic dipole moment and magnetic radius can be used to discriminate different structures of $d^{*}$ . Moreover, a quite small electric quadrupole deformation indicates that $d^{*}$ is more inclined to an slightly oblate shape due to our compact hexaquark dominated structure of $d^{*} (2380)$ .
Comments:
14 pages, 4 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1801.04700 [pdf]
PRD(2018)·19 citations
13
[Submitted on 15 Jan 2018] (cross-list from hep-ph)
Hadronic structure from double parton scattering
Matteo Rinaldi🇪🇸 · Federico Alberto Ceccopieri🇧🇪
In the present paper we consider the so-called effective cross section, a quantity which encodes the experimental knowledge on double parton scattering in hadronic collisions that has been accomulated so far. We show that the effective cross section, under some assumptions close to those adopted in its experimental extractions, can be used to obtain a range of mean transverse distance between an interacting parton pair in double parton scattering. Therefore we have proved that the effective cross section offers a way to access information on the hadronic structure.
Comments:
5 pages, 1 figure. References added and figure updated. Referee suggestions implemented. Published in PRD rapid communication
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1801.04760 [pdf]
PRD(2018)·32 citations
14
[Submitted on 15 Jan 2018] (cross-list from hep-ph)
Multi Quark Production in p+A collisions: Quantum Interference Effects
Alex Kovner🇺🇸 · Amir H. Rezaeian🇨🇱
We consider forward inclusive production of several quarks in the high energy p-A collisions in the CGC formalism. For three particle production we provide a complete expression in terms of multipole scattering amplitudes on the nucleus and multi particle generalized TMD's of the proton. We then calculate all the terms that are not suppressed by the factor of the area in four particle production, and generalize this result up to terms of order $1/ N_{c}^{2}$ for arbitrary number of produced particles. Our results include the contribution of quantum interference effects both in the final state radiation (HBT) and in the initial projectile wave function (Pauli blocking).
Comments:
20 pages
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1801.04875 [pdf]
PRD(2018)·25 citations

Affiliations

first authorsco-authorsvia INSPIRE

Transport coefficients in the Polyakov quark meson coupling model: A quasi particle approach

Surveying exotic pentaquarks with the typical QQqqqˉ​ configuration

On the form factors of d∗(2380)

Hadronic structure from double parton scattering

Multi Quark Production in p+A collisions: Quantum Interference Effects

Affiliations

Surveying exotic pentaquarks with the typical $QQq q q ˉ$ configuration

On the form factors of $d^{*} (2380)$