Nuclear Theory·nucl-th

Thursday·January 15, 2015

13 papers—6 primary·7 cross-listed

01
[Submitted on 14 Jan 2015]
The Relativistic Green's function model and charged-current inclusive neutrino-nucleus scattering at T2K kinematics
Andrea Meucci🇮🇹 · Carlotta Giusti🇮🇹
We compare the results of the relativistic Green's function model with the experimental data of the charged-current inclusive differential neutrino-nucleus cross sections published by the T2K Collaboration. The model, which is able to describe both MINER $ν$ A and MiniBooNE charged-current quasielastic scattering data, underpredicts the inclusive T2K cross sections.
Comments:
6 pages, 4 figures. arXiv admin note: text overlap with arXiv:1404.3554
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
1501.03213 [pdf]
PRD(2015)·15 citations
02
[Submitted on 14 Jan 2015]
Impact of the symmetry energy on nuclear pasta phases and crust-core transition in neutron stars
S. S. Bao🇨🇳 · H. Shen🇨🇳
We study the impact of the symmetry energy on properties of nuclear pasta phases and crust-core transition in neutron stars. We perform a self-consistent Thomas--Fermi calculation employing the relativistic mean-field model. The properties of pasta phases presented in the inner crust of neutron stars are investigated and the crust-core transition is examined. It is found that the slope of the symmetry energy plays an important role in determining the pasta phase structure and the crust-core transition. The correlation between the symmetry energy slope and the crust-core transition density obtained in the Thomas--Fermi approximation is consistent with that predicted by the liquid-drop model.
Comments:
25 pages, 9 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1501.03239 [pdf]
PRC(2015)·50 citations
03
[Submitted on 14 Jan 2015]
A hybrid model approach for strange and multi-strange hadrons in 2.76 A TeV Pb+Pb collisions
Xiangrong Zhu🇨🇳 · Fanli Meng (Peking U.)🇨🇳 · Huichao Song🇨🇳 · Yu-Xin Liu (Peking U. & Peking U. CHEP)🇨🇳
Using the VISHNU hybrid model, we calculate the multiplicity, spectra, and elliptic flow of $Λ$ , $Ξ$ and $Ω$ in 2.76 A TeV Pb+Pb collisions. Comparisons between our calculations and the ALICE measurements show that the model generally describes the soft hadron data of these strange and multi-strange hadrons at several centrality bins. Mass ordering of elliptic flow among $π$ , K, p, $Λ$ , $Ξ$ and $Ω$ has also been studied and discussed. With a nice description of the particle yields, we explore chemical and thermal freeze-out of various hadrons species at the LHC within the framework of the VISHNU hybrid model.
Comments:
version 2: with several references added, published in PRC
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1501.03286 [pdf]
PRC(2015)·45 citations
04
[Submitted on 14 Jan 2015]
$(h_{11/2})^{2}$ alignments in neutron-rich $^{132}$ Ba with negative-parity pairs
Yang Lei · Zhengyu Xu
The shell-model collective-pair truncation with negative-parity pairs is adopted to study the $(h_{11/2})^{2}$ alignment in $^{132}$ Ba. The proton $(h_{11/2})^{2}$ -alignment state is predicted as an $E \sim 4.6$ MeV and $τ \sim 0.5 μ$ s isomer with relatively strong E3 decay channels. The oblately deformed neutron $(h_{11/2})^{- 2}$ alignment in the yrast band and four negative-parity bands are confirmed, even although two of these negative-parity bands favor the prolate deformation, which directly manifests the $γ$ unstability of $^{132}$ Ba.
Comments:
4 pages, 5 figures
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
1501.03346 [pdf]
PRC(2015)·7 citations
05
[Submitted on 14 Jan 2015]
Dilepton production from the quark-gluon plasma using (3+1)-dimensional anisotropic dissipative hydrodynamics
Radoslaw Ryblewski🇵🇱 · Michael Strickland🇺🇸
We compute dilepton production from the deconfined phase of the quark-gluon plasma using leading-order (3+1)-dimensional anisotropic hydrodynamics. The anisotropic hydrodynamics equa- tions employed describe the full spatiotemporal evolution of the transverse temperature, spheroidal momentum-space anisotropy parameter, and the associated three-dimensional collective flow of the matter. The momentum-space anisotropy is also taken into account in the computation of the dilepton production rate, allowing for a self-consistent description of dilepton production from the quark-gluon plasma. For our final results, we present predictions for high-energy dilepton yields as a function of invariant mass, transverse momentum, and pair rapidity. We demonstrate that high- energy dilepton production is extremely sensitive to the assumed level of initial momentum-space anisotropy of the quark-gluon plasma. As a result, it may be possible to experimentally constrain the early-time momentum-space anisotropy of the quark-gluon plasma generated in relativistic heavy ion collisions using high-energy dilepton yields.
Comments:
13 pages, 9 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
1501.03418 [pdf]
PRD(2015)·42 citations
06
[Submitted on 12 Jan 2015]
Calculation of the Electric and Magnetic Root Mean Squared Radiuses of Proton Based on MIT Bag Model
Maryam Momeni Feili🇮🇷 · Mahvash Zandi🇮🇷
The electric and magnetic bag radiuses of the proton can be determined by MIT bag model based on electric and magnetic form factors of the proton. Also we determined electric and magnetic root mean squared radiuses of the proton, using of bag radius and compared with other results suggests a suitable compatibility.
Comments:
7 pages, 3 figures. arXiv admin note: substantial text overlap with arXiv:1208.4047, arXiv:nucl-th/9911065 by other authors
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
1501.03464 [pdf]
0 citations
07
[Submitted on 13 Jan 2015] (cross-list from hep-ph)
Remarks on the study of the X(3872) from Effective Field Theory with Pion-Exchange Interaction
V. Baru🇩🇪 · E. Epelbaum🇩🇪 · A.A. Filin🇩🇪 · Feng-Kun Guo🇩🇪 · H.-W. Hammer🇩🇪 · C. Hanhart🇩🇪 · Ulf-G. Meißner🇩🇪 · A.V. Nefediev🇷🇺
In a recent paper Phys.Rev.Lett. 111, 042002 (2013) (arXiv:1304.0846), the charmonium state X(3872) is studied in the framework of an effective field theory. In that work it is claimed that (i) the one-pion exchange (OPE) alone provides sufficient binding to produce the X as a shallow bound state at the $D^{0} D ˉ^{* 0}$ threshold, (ii) short-range dynamics (described by a contact interaction) provides only moderate corrections to the OPE, and (iii) the X-pole disappears as the pion mass is increased slightly and therefore the X should not be seen on the lattice, away from the pion physical mass point, if it were a molecular state. In this paper we demonstrate that the results of Phys.Rev.Lett. 111, 042002 (2013) (arXiv:1304.0846) suffer from technical as well as conceptual problems and therefore do not support the conclusions drawn by the authors.
Comments:
LaTeX2e, 7 pages, 2 figures, to appear in Phys.Rev.D
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
1501.02924 [pdf]
PRD(2015)·59 citations
08
[Submitted on 13 Jan 2015] (cross-list from hep-ex)
Neutrino-Nucleus Interactions at the LBNF Near Detector
Ulrich Mosel🇩🇪
The reaction mechanisms for neutrino interactions with an $^{40} A r$ nucleus with the LBNF flux are calculated with the Giessen-Boltzmann-Uehling-Uhlenbeck (GiBUU) transport-theoretical implementation of these interactions. Quasielastic scattering, many-body effects, pion production and absorption and Deep Inelastic Scattering are discussed; they all play a role at the LBNF energies and are experimentally entangled with each other. Quasielastic scattering makes up for only about 1/3 of the total cross section whereas pion production channels make up about 2/3 of the total. This underlines the need for a consistent description of the neutrino-nucleus reaction that treats all channels on an equal, consistent footing. The results discussed here can also serve as useful guideposts for the Intermediate Neutrino Program.
Comments:
Proc. of the CETUP* Workshop 2014, Caption of Fig. 5 made more specific
Subjects:
High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1501.03160 [pdf]
AIP Conf.Proc.(2015)·4 citations
09
[Submitted on 14 Jan 2015] (cross-list from hep-th)
Inverse magnetic catalysis in holographic models of QCD
Kiminad A. Mamo🇺🇸
We study the effect of magnetic field $B$ on the critical temperature $T_{c}$ of the confinement-deconfinement phase transition in hard-wall AdS/QCD, and holographic duals of flavored and unflavored $N = 4$ super-Yang Mills theories on $R^{3} \times S^{1}$ . For all of the holographic models, we find that $T_{c} (B)$ decreases with increasing magnetic field $B ≪ T^{2}$ , consistent with the inverse magnetic catalysis recently observed in lattice QCD for $B ≲ 1 G e V^{2}$ . We also predict that, for large magnetic field $B ≫ T^{2}$ , the critical temperature $T_{c} (B)$ , eventually, starts to increase with increasing magnetic field $B ≫ T^{2}$ and asymptotes to a constant value.
Comments:
19 pages, 2 figures, an appendix (which discusses the large magnetic field case) added, references added; typo fixed, more footnotes added, accepted for publication in JHEP
Subjects:
High Energy Physics — Theory (hep-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1501.03262 [pdf]
JHEP(2015)·94 citations
10
[Submitted on 14 Jan 2015] (cross-list from astro-ph.SR)
Heat capacity of low density neutron matter: from quantum to classical regimes
A. Pastore · N. Chamel · J. Margueron
The heat capacity of neutron matter is studied over the range of densities and temperatures prevailing in neutron-star crusts, allowing for the transition to a superfluid phase at temperatures below some critical temperature $T_{s f}$ and including the transition to the classical limit. Finite temperature Hartree-Fock-Bogoliubov equations (FTHFB) are solved and compared to existing approximate expressions. In particular, the formula given by Levenfish and Yakovlev is found to reproduce the numerical results with a high degree of accuracy for temperatures $T \leq T_{s f}$ . In the non-superfluid phase, $T \geq T_{s f}$ , the linear approximation is valid only at temperature $T ≪ T_{F n}$ ( $T_{F n}$ being the Fermi temperature of the neutron gas) which is rarely the case in the shallow layers of the neutron star's crust. A non-perturbative interpolation between the quantal and the classical regimes is proposed here. The heat capacity, conveniently parametrized solely in terms of $T_{s f}$ , $T_{F n}$ , and the neutron number density $n_{n}$ , can be easily implemented in neutron-star cooling simulations.
Comments:
Accepted by Monthly Notices of the Royal Astronomical Society
Subjects:
Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Theory (nucl-th)
arXiv:
1501.03364 [pdf]
MNRAS(2015)·5 citations
11
[Submitted on 14 Jan 2015] (cross-list from hep-ph)
Open charm production in high multiplicity proton-proton events at the LHC
E. G. Ferreiro🇪🇸 · C. Pajares🇪🇸
We present the dependence of $D$ production on the charged particle multiplicity in proton-proton collisions at LHC energies. We show that, in a framework of source coherence, the open charm production exhibits a growth with the multiplicity which is stronger than linear in the high density domain. This departure from linearity was previously observed in the $J / ψ$ inclusive data from proton-proton collisions at 7 TeV and was successfully described in our approach. Our assumption, the existence of coherence effects present in proton-proton collisions at high energy, applies for high multiplicity proton-proton collisions in the central rapidity region and should affect any hard observable.
Comments:
7 pages, 2 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1501.03381 [pdf]
30 citations
12
[Submitted on 14 Jan 2015] (cross-list from hep-ph)
Energy flow along the medium-induced parton cascade
Jean-Paul Blaizot🇫🇷 · Yacine Mehtar-Tani🇺🇸
We discuss the dynamics of parton cascades that develop in dense QCD matter, and contrast their properties with those of similar cascades of gluon radiation in vacuum. We argue that such cascades belong to two distinct classes that are characterized respectively by an increasing or a constant (or decreasing) branching rate along the cascade. In the former class, of which the BDMPS, medium-induced, cascade constitutes a typical example, it takes a finite time to transport a finite amount of energy to very soft quanta, while this time is essentially infinite in the latter case, to which the DGLAP cascade belongs. The medium induced cascade is accompanied by a constant flow of energy towards arbitrary soft modes, leading eventually to the accumulation of the initial energy of the leading particle at zero energy. It also exhibits scaling properties akin to wave turbulence. These properties do not show up in the cascade that develops in vacuum. There, the energy accumulates in the spectrum at smaller and smaller energy as the cascade develops, but the energy never flows all the way down to zero energy. Our analysis suggests that the way the energy is shared among the offsprings of a splitting gluon has little impact on the qualitative properties of the cascades, provided the kernel that governs the splittings is not too singular.
Comments:
46 pages, 9 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1501.03443 [pdf]
Annals Phys.(2016)·37 citations
13
[Submitted on 14 Jan 2015] (cross-list from hep-ph)
$D_{s 0}^{*\pm} (2317)$ and $K D$ scattering from $B_{s}^{0}$ decay
Miguel Albaladejo🇪🇸 · Marina Nielsen🇧🇷 · Eulogio Oset🇪🇸
We study the $B ˉ_{s}^{0} \to D_{s}^{-} (D K)^{+}$ weak decay, and look at the $D K$ invariant mass distribution with the aim of obtaining relevant information on the nature of the $D_{s 0}^{*+} (2317)$ resonance. We make a simulation of the experiment using the actual mass of the $D_{s 0}^{*+} (2317)$ resonance and recent lattice QCD relevant parameters of the $K D$ scattering amplitude. We then solve the inverse problem of obtaining the $K D$ amplitude from these synthetic data, to which we have added a 5\% or 10\% error. We prove that one can obtain from these "data" the existence of a bound $K D$ state, the $K D$ scattering length and effective range, and most importantly, the $K D$ probability in the wave function of the bound state obtained, which was found to be largely dominant from the lattice QCD results. This means that one can obtain information on the nature of the $D_{s 0}^{*+} (2317)$ resonance from the implementation of this experiment, in the line of finding the structure of resonances, which is one of the main aims in hadron spectroscopy.
Comments:
6 pages, 3 figures. v2: New references and comments added in the Introduction
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1501.03455 [pdf]
PLB(2015)·19 citations

Affiliations

first authorsco-authorsvia INSPIRE