Nuclear Theory·nucl-th

Monday·November 30, 2015

10 papers—4 primary·6 cross-listed

05
[Submitted on 24 Nov 2015] (cross-list from hep-ph)
Leptons from heavy-quark semileptonic decay in pA collisions within the CGC framework
Hirotsugu Fujii🇯🇵 · Kazuhiro Watanabe🇨🇳
We study single lepton production from semileptonic decays of heavy flavor hadrons ( $D, B \to l$ ) in pp and p $A$ collisions at RHIC and the LHC within the saturation/Color-Glass-Condensate (CGC) framework. Using the gluon distribution function obtained with the dipole amplitude, whose energy dependence is described by the Balitsky-Kovchegov equation with running coupling effect, we compute the transverse-momentum ( $p_{⊥}$ ) spectra of the lepton yields at mid and forward rapidities. We find that a large fraction of leptons at low $p_{⊥}$ stems from the saturation regime of the incoming gluons in the target, especially in p $A$ collisions at the LHC. The resultant $p_{⊥}$ spectra is slightly harder than the data, but the nuclear modification factor seems consistent with the data within some uncertainty. We also update the nuclear modification factors for J/ $ψ$ and $D$ meson at the LHC energy.
Comments:
19 pages, 11 figures; v2 Figure 5 replaced; v3 Figures 3,4,5,6,7,8,9 replaced; v4 typo in (1) corrected
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1511.07698 [pdf]
NPA(2016)·19 citations
06
[Submitted on 25 Nov 2015] (cross-list from nucl-ex)
Comment on "Evidence for narrow resonant structures at $W \approx$ 1.68 GeV and $W \approx$ 1.72 GeV in real Compton scattering off the proton"
D. Werthmüller🇬🇧 · L. Witthauer🇨🇭 · D.I. Glazier🇬🇧 · B. Krusche🇨🇭
We comment on the statement by Kuznetsov et al. that the structure around W=1.72 GeV seen in the beam asymmetry in Compton scattering off the proton is not observed in the total cross section of $η$ photoproduction on the neutron.
Comments:
2 pages, 1 figure; corrected typos, reference, PACS numbers
Subjects:
Nuclear Experiment (nucl-ex); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
1511.08249 [pdf]
PRC(2015)·15 citations
07
[Submitted on 27 Nov 2015] (cross-list from hep-ph)
Heavy baryons with Strangeness in Soliton Models
H. Weigel🇿🇦 · J.P. Blanckenberg🇿🇦
We present some recent results from soliton model calculations for the spectrum of baryons with a single heavy quark.The model comprises chiral symmetry for light flavors and (approximate) heavy spin-flavor symmetry for the heavy quarks. We focus on flavor symmetry breaking for strangeness degrees of freedom.
Comments:
Contribution to Hadron Structure 2015 Conference
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1511.08570 [pdf]
Int.J.Mod.Phys.Conf.Ser.(2015)·0 citations
08
[Submitted on 27 Nov 2015] (cross-list from hep-ph)
Pion Induced Reactions for the Study of Charmed Baryons
Sang-Ho Kim🇰🇷 · Atsushi Hosaka🇯🇵 · Hyun-Chul Kim🇰🇷 · Hiroyuki Noumi🇯🇵
In this talk, we report the study of $π^{-} p \to K^{* 0} Λ$ and $π^{-} p \to D^{*-} Λ_{c}^{+}$ reactions by using an effective Lagrangian method and a hybrid Regge model. The total and differential cross sections for the $K^{* 0} Λ$ production are first calculated and then those for the $D^{*-} Λ_{c}^{+}$ one are estimated. The two models yield different results, each exhibiting specific features. Our prediction for the charm production provides valuable information about the upcoming J-PARC experiment.
Comments:
5 pages, 9 figures, Parallel talk at "The 10th International Workshop on the Physics of Excited Nucleons (NSTAR2015)", Osaka, Japan, May 25-28, 2015
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1511.08590 [pdf]
JPS Conf.Proc.(2016)·1 citation
09
[Submitted on 27 Nov 2015] (cross-list from hep-th)
$U (1)$ current from the AdS/CFT: diffusion, conductivity and causality
Yanyan Bu🇮🇱 · Michael Lublinsky🇮🇱 · Amir Sharon🇮🇱
For a holographically defined finite temperature theory, we derive an off-shell constitutive relation for a global $U (1)$ current driven by a weak external non-dynamical electromagnetic field. The constitutive relation involves an all order gradient expansion resummed into three momenta-dependent transport coefficient functions: diffusion, electric conductivity, and "magnetic" conductivity. These transport functions are first computed analytically in the hydrodynamic limit, up to third order in the derivative expansion, and then numerically for generic values of momenta. We also compute a diffusion memory function, which, as a result of all order gradient resummation, is found to be causal.
Comments:
v1: 26 pages, 12 figures; v2: 29 pages, 9 multi-figures, revised section 6, added one summary(section 7) and one appendix, to be published in JHEP
Subjects:
High Energy Physics — Theory (hep-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1511.08789 [pdf]
JHEP(2016)·24 citations
10
[Submitted on 27 Nov 2015] (cross-list from hep-th)
Drag suppression in anomalous chiral media
Andrey V. Sadofyev🇺🇸 · Yi Yin🇺🇸
We study a heavy impurity moving longitudinal with the direction of an external magnetic field in an anomalous chiral medium. Such system would carry a non-dissipative current of chiral magnetic effect associated with the anomaly. We show, by generalizing Landau's criterion for superfluidity, that the "anomalous component" which gives rise to the anomalous transport will {\it not} contribute to the drag experienced by an impurity. We argue on a very general basis that those systems with a strong magnetic field would exhibit an interesting transport phenomenon -- the motion of the heavy impurity is frictionless, in analogy to the case of a superfluid. We demonstrate and confirm our general results with two complementary examples: weakly coupled chiral fermion gases and strongly interacting chiral liquids.
Comments:
6 pages, 1 figure, version accepted in PRD
Subjects:
High Energy Physics — Theory (hep-th); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Nuclear Theory (nucl-th)
arXiv:
1511.08794 [pdf]
PRD(2016)·31 citations

Affiliations

first authorsco-authorsvia INSPIRE

Leptons from heavy-quark semileptonic decay in pA collisions within the CGC framework

Comment on "Evidence for narrow resonant structures at W≈ 1.68 GeV and W≈ 1.72 GeV in real Compton scattering off the proton"

Heavy baryons with Strangeness in Soliton Models

Pion Induced Reactions for the Study of Charmed Baryons

U(1) current from the AdS/CFT: diffusion, conductivity and causality

Drag suppression in anomalous chiral media

Affiliations

Comment on "Evidence for narrow resonant structures at $W \approx$ 1.68 GeV and $W \approx$ 1.72 GeV in real Compton scattering off the proton"

$U (1)$ current from the AdS/CFT: diffusion, conductivity and causality