Nuclear Theory·nucl-th

Monday·December 2, 2019

17 papers—11 primary·6 cross-listed

12
[Submitted on 28 Nov 2019] (cross-list from hep-ph)
Weak structure functions in $ν_{l} - N$ and $ν_{l} - A$ scattering with nonperturbative and higher order perturbative QCD effects
F. Zaidi🇮🇳 · H. Haider🇺🇸 · M. Sajjad Athar🇮🇳 · S. K. Singh🇮🇳 · I. Ruiz Simo🇪🇸
We study the effect of various perturbative and nonperturbative QCD corrections on the free nucleon structure functions ( $F_{i N}^{W I} (x, Q^{2}); i = 1 - 3$ ) and their implications in the determination of nuclear structure functions. The evaluation of the nucleon structure functions has been performed by using the MMHT 2014 PDFs parameterization, and the TMC and HT effects are incorporated following the works of Schienbein et al. and Dasgupta et al., respectively. These nucleon structure functions are taken as input in the determination of nuclear structure functions. The numerical calculations for the $ν_{l} / ν ˉ_{l} - A$ DIS process have been performed by incorporating the nuclear medium effects like Fermi motion, binding energy, nucleon correlations, mesonic contributions, shadowing and antishadowing in several nuclear targets such as carbon, polystyrene scintillator, iron and lead which are being used in MINERvA, and in argon nucleus which is relevant for the ArgoNeuT and DUNE experiments. The differential scattering cross sections $\frac{d ^{2} σ _{A}^{W I}}{d x d y}$ and $(\frac{d σ _{A}^{W I}}{d x} / \frac{d σ _{C H}^{W I}}{d x})$ have also been studied in the kinematic region of MINERvA experiment. The theoretical results are compared with the recent experimental data of MINERvA and the earlier data of NuTeV, CCFR, CDHSW and CHORUS collaborations. Moreover, a comparative analysis of the present results for the ratio $(\frac{d σ _{A}^{W I}}{d x} / \frac{d σ _{C H}^{W I}}{d x})$ , and the results from the MC generator GENIE and other phenomenological models of Bodek and Yang, and Cloet et al., has been performed in the context of MINERvA experiment. The predictions have also been made for $ν ˉ_{l} - A$ cross section relevant for MINERvA experiment.
Comments:
25 pages, 15 figures and 1 table
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1911.12573 [pdf]
PRD(2020)·23 citations
13
[Submitted on 28 Nov 2019] (cross-list from hep-ph)
J/ $ψ$ p Scattering Length from GlueX Threshold Measurements
Igor Strakovsky (GWU)🇺🇸 · Denis Epifanov (Budker Ins)🇷🇺 · Lubomir Pentchev (JLab)🇺🇸
The quality of the recent GlueX $J / ψ$ photoproduction data from Hall~D at Jefferson Laboratory, and the proximity of the data to the energy threshold, gives access to a variety of interesting physics aspects. As an example, an estimation of the $J / ψ$ -nucleon scattering length $α_{J / ψ p}$ is provided within the vector meson dominance model. It results in $∣ α_{J / ψ p} ∣ = (3.08 \pm 0.55 (stat.) \pm 0.45 (syst.))$ ~mfm.
Comments:
5 pages, 2 figures, v1 had a typo
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1911.12686 [pdf]
PRC(2020)·46 citations
14
[Submitted on 28 Nov 2019] (cross-list from hep-ph)
Deconfined, Massive Quark Phase at High Density and Compact Stars: A Holographic Study
Kazem Bitaghsir Fadafan🇮🇷 · Jesus Cruz Rojas🇬🇧 · Nick Evans🇬🇧
In Hoyos et al. (arXiv:1603.02943) a holographic D3/D7 system was used to describe a deconfined yet massive quark phase of QCD at finite density, concluding that the equation of state of such a phase was not stiff enough to support exotic dense stars. That analysis used a hard quark mass to represent the dynamical mass and assumed a conformal gauge background. Here we phenomenologically adjust the D3/D7 system to include a running anomalous dimension for the quark condensate. This introduces a dynamical mechanism for chiral symmetry breaking yet the model still has a deconfined massive phase at intermediate densities. We show that these systems, dependent on the running profile in the deep IR, generate much stiffer equations of state and non-monotonic behaviour in the speed of sound. The results suggest that these equations of state may be closer to supporting hybrid stars with quark cores.
Comments:
13 pages, 16 figures, added discussion
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
1911.12705 [pdf]
PRD(2020)·64 citations
15
[Submitted on 28 Nov 2019] (cross-list from hep-ph)
Gluon Radiation from a classical point particle II: dense gluon fields
K. Kajantie🇫🇮 · Larry D. McLerran🇺🇸 · Risto Paatelainen🇫🇮
The goal of this paper is to extend the results of Ref. [1], where formulae were derived for gluonic radiation for a high energy nucleus colliding with a classical colored particle. In Ref. [1], we computed the amplitudes for radiation in the fragmentation region of the particle for a dilute gluonic field. In this paper, we compute the radiation by solving the fluctuation equations of the dense background field in a specific gauge which makes it simple to solve the asymptotic radiation from an initial condition immediately after the passage of the nucleus. We identify and compute two components of gluon radiation, a bulk component which extends to the central region and bremsstrahlung, which may give rise to an experimentally observable intensity peak in the target fragmentation region.
Comments:
36 pages, 8 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1911.12738 [pdf]
PRD(2020)·9 citations
16
[Submitted on 29 Nov 2019] (cross-list from hep-ph)
Charmed excited baryons with heavy-quark spin symmetry
L. Tolos🇩🇪 · J. Nieves🇪🇸 · R. Pavao🇪🇸
Recently five $Ω_{c}$ excited states have been reported by the LHCb Collaboration, four of them corroborated by Belle. The Belle Collaboration has also discovered in 2017 one excited $Ξ_{c}$ with mass of 2930 MeV. In view of these recent detections, we analyze the possible molecular description of these states, using a unitarized baryon-meson model that incorporates both chiral and heavy-quark spin symmetries in a consistent manner. We pay a special attention to the renormalization procedure, so as to determine the robustness of our predictions. Within our model, we generate dynamically several $Ω_{c}$ and $Ξ_{c}$ states. We find that, at least, three of our $Ω_{c}$ states can be identified with the experimental ones and have spin-parity $J = 1/ 2^{-}$ or $J = 3/ 2^{-}$ . Moreover, we find a plausible molecular description of not only the $Ξ_{c} (2930)$ state, but also $Ξ_{c} (2790)$ , $Ξ_{c} (2815)$ and $Ξ_{c} (2970)$ , reported in the PDG. Interestingly, we determine that $Ξ_{c} (2930)$ and $Ξ_{c} (2970)$ are heavy-quark spin partners with $J = 1/ 2^{-}$ and $J = 3/ 2^{-}$ , respectively, while obtaining that $Ξ_{c} (2930)$ , $Ω_{c} (3090)$ or the $Ω_{c} (3119)$ , and $Σ_{c} (2800)$ would belong to the same SU(3) multiplet.
Comments:
6 pages, contribution to the proceedings of the XVIII International Conference on Hadron Spectroscopy and Structure (HADRON2019), Guilin, China, 16-21 August 2019
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1911.13016 [pdf]
0 citations
17
[Submitted on 29 Nov 2019] (cross-list from hep-ph)
The enigmatic $Δ (1600)$ resonance
B. Golli🇸🇮
Our recently proposed model of the $Δ (1600)$ resonance, in which the dominant component is a quasi-bound state of the $Δ (1232)$ and the pion, is confronted with a similar model of the $N^{*} (1440)$ resonance as its counterpart in the P11 partial wave. We stress an essentially different mechanism responsible for generating the two resonances.
Comments:
Contributed talk at the Mini-Workshop "Electroweak Processes of Hadrons", Bled, Slovenia, July 15-19, 2019, 4 pages, 3 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1911.13026 [pdf]
Bled Workshops Phys.(2019)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE

Weak structure functions in νl​−N and νl​−A scattering with nonperturbative and higher order perturbative QCD effects

J/ψp Scattering Length from GlueX Threshold Measurements

Deconfined, Massive Quark Phase at High Density and Compact Stars: A Holographic Study

Gluon Radiation from a classical point particle II: dense gluon fields

Charmed excited baryons with heavy-quark spin symmetry

The enigmatic Δ(1600) resonance

Affiliations

Weak structure functions in $ν_{l} - N$ and $ν_{l} - A$ scattering with nonperturbative and higher order perturbative QCD effects

J/ $ψ$ p Scattering Length from GlueX Threshold Measurements

The enigmatic $Δ (1600)$ resonance