Nuclear Theory·nucl-th

Friday·November 30, 2018

10 papers—4 primary·6 cross-listed

01
[Submitted on 29 Nov 2018]
Comparison of cuprates and nuclear matter pairing properties. Quartet (alpha-particle) condensation in nuclear systems
P. Schuck (1) ((1) Institut de Physique Nucléaire, Orsay, France and Laboratoire de Physique et de Modélisation des Milieux Condensés, Grenoble, France)
A comparison of pairing properties in cuprates and nuclear matter is briefly discussed. Quartet (alpha-particle) condensation is a very important aspect of nuclear physics. The physics of the Hoyle state in 12 C will be outlined and its crucial role for the existence of life on earth explained.
Comments:
Contribution to EuNPC2018-conference
Subjects:
Nuclear Theory (nucl-th); Strongly Correlated Electrons (cond-mat.str-el); Superconductivity (cond-mat.supr-con)
arXiv:
1811.12018 [pdf]
Nuovo Cim.C(2019)·0 citations
02
[Submitted on 29 Nov 2018]
Jet tomography in high-energy nuclear collisions
Ben-Wei Zhang🇨🇳 · Guo-Yang Ma🇨🇳 · Wei Dai🇨🇳 · Sa Wang🇨🇳 · Shan-Liang Zhang🇨🇳
When an energetic parton traversing the QCD medium, it may suffer multiple scatterings and lose energy. This jet quenching phenomenon may lead to the suppression of leading hadron productions as well as medium modifications of full jet observables in heavy-ion collisions. In this talk we discuss the nuclear modification factors and yield ratios of identified meson such as $η$ , $ρ^{0}$ , $ϕ$ , $ω$ , and $K_{S}^{0}$ as well as $π$ meson at large $p_{T}$ in A+A collisions at the next-to-leading order (NLO) with high-twist approach of parton energy loss. Then we discuss a newly developed formalism of combing NLO matrix elements and parton shower (PS) for initial hard production with parton energy loss in the QGP, and its application in investigating massive gauge boson ( $Z^{0}$ / $W^{\pm}$ ) tagged jet productions and $b b ˉ$ dijet correlations in Pb+Pb at the LHC.
Comments:
Invited talk at ISMD2018 (the International Symposium on Multiparticle Dynamics), the National University of Singapore, Singapore. Submitted to the cofference proceedings. 10 pages, 12 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
1811.12093 [pdf]
EPJ Web Conf.(2019)·4 citations
03
[Submitted on 29 Nov 2018]
Wigner-Eckart Theorem and the False EDM of $^{199}$ Hg
Wolfgang Klassen🇨🇦 · Jeffery W. Martin🇨🇦 · Guillaume Pignol🇫🇷
In neutron electric dipole moment experiments, 199Hg is used as a comagnetometer. The comagnetometer suffers from a false EDM arising in leading order from a gradient dBz/dz in the magnetic field. Our work concerns higher-order multipole corrections to the false EDM of 199Hg. We show that for spherical traps, all higher-order multipole are identically zero. We further show that for the usual cylindrical traps used in EDM experiments, selection of quasi-spherical dimensions for the trap can reduce the higher-order contributions. The results are another indication that trap geometry is an important consideration for experiments desiring to control this systematic effect.
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex); Instrumentation and Detectors (physics.ins-det)
arXiv:
1811.12262 [pdf]
Nucl.Instrum.Meth.A(2019)·0 citations
04
[Submitted on 29 Nov 2018]
Distinguishing Quarks and Gluons in Pion and Kaon PDFs
Kyle D. Bednar🇺🇸 · Ian C. Cloët🇺🇸 · Peter C. Tandy🇺🇸
The leading-twist parton distribution functions of the pion and kaon are calculated for the first time using a rainbow-ladder truncation of QCD's Dyson-Schwinger equations (DSEs) that self-consistently sums all planar diagrams. The non-perturbative gluon dressing of the quarks is thereby correctly accounted for, which in practice means solving the inhomogeneous Bethe-Salpeter equation (BSE) for the quark operator that defines the spin-independent quark distribution functions. An immediate consequence of using this dressed vertex is that gluons carry 35% of the pion's and 30% of the kaon's light-cone momentum, with the remaining momentum carried by the quarks. The scale associated with these DSE results is $μ_{0} = 0.78$ GeV. The gluon effects generated by the inhomogeneous BSE are inherently non-perturbative and cannot be mimicked by the perturbative QCD evolution equations. A key consequence of this gluon dressing is that the valence quarks have reduced support at low-to-intermediate $x$ , where the gluons dominate, and increased support at large $x$ . As a result, our DSE calculation of the pion's valence quark distribution is in excellent agreement with the Conway et al. pion-induced Drell-Yan data, but nevertheless exhibits the $q_{π} (x) ≃ (1 - x)^{2}$ behavior as $x \to 1$ predicted by perturbative QCD.
Comments:
Improved discussion of results with results unchanged
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
1811.12310 [pdf]
PRL(2020)·72 citations
05
[Submitted on 28 Nov 2018] (cross-list from hep-ph)
Ansatz for baryonic wave function obtained from a mesonic one
Alfredo Vega🇨🇱
Based on ideas that relate meson and baryon spectrum considering SUSY QM and light front holography, we propose a procedure to obtain LFWF for baryons starting from mesonic ones. We apply a procedure suggested for Gaussian ansatz used to study mesons.
Comments:
Version submited contains a big mistake
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1811.11869 [pdf]
0 citations
06
[Submitted on 29 Nov 2018] (cross-list from hep-ph)
Existing and expected manifestations of a new fundamental interaction
L.M. Slad🇷🇺
A number of characteristics of the new fundamental interaction are described. The interaction is carried by a massless pseudoscalar boson and extends to at least the electron neutrino, proton, and neutron. A substantiation of the existence of such an interaction is supported by an good agreement between the theoretical and experimental rates of all the five observed processes with solar neutrinos. A bright manifestation of the new interaction is expected in the observation that its contribution to the rate of splitting of a number of light stable nuclei by reactor antineutrinos is approximately six orders of magnitude greater than the contribution of electroweak interaction.
Comments:
9 pages. Additions and a correction in Table 4
Subjects:
High Energy Physics — Phenomenology (hep-ph); Solar and Stellar Astrophysics (astro-ph.SR); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
1811.12056 [pdf]
IJMPE(2021)·3 citations
07
[Submitted on 29 Nov 2018] (cross-list from astro-ph.HE)
Ferromagnetic Neutron Stars in Scalar-Tensor Theories of Gravity
Zeinab Rezaei🇮🇷 · Habib Yousefi Dezdarani🇮🇷
Ferromagnetic spin ordering can take place in neutron stars. This phase transition alters the neutron star equation of state. Here, applying the scalar-tensor theories of gravity, we investigate the structure of neutron stars which are in the ferromagnetic phase. Considering the equation of state of ferromagnetic neutron matter with Skyrme-type interactions at zero temperature and using the scalar-tensor theories of gravity with sufficiently negative coupling constant, we explore the spontaneous scalarization in ferromagnetic neutron stars. In this regard, the mass versus the central density, the profiles of scalar field and mass and density, the central scalar field for different central densities, and the mass-radius relation of ferromagnetic neutron stars are presented. Moreover, we investigate the influences of the coupling constant on the scalarization of ferromagnetic neutron stars. The effects of the coupling constant on the critical densities of scalarization and the scalar charge of ferromagnetic neutron stars are also calculated. In addition, we study the maximum value of the coupling constant at which the spontaneous scalarization takes place presenting the influence of the neutron matter equation of state on this critical value.
Comments:
25 pages, 11 figures. Accepted for publication in Journal of Cosmology and Astroparticle Physics (2019)
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
arXiv:
1811.12090 [pdf]
JCAP(2019)·1 citation
08
[Submitted on 29 Nov 2018] (cross-list from hep-ph)
Exotic Baryons in Chiral Soliton Models
H. Weigel🇿🇦
We cautiously review the treatment of pentaquark exotic baryons in chiral soliton models. We consider two examples and argue that any consistent and self-contained description must go beyond the mean field approximation that only considers the classical soliton and the canonical quantization of its (would-be) zero modes via collective coordinates.
Comments:
Contribution to 7th Int. Conf. on New Frontier of Physics, Kolymbari, Greece, July 2018
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1811.12128 [pdf]
Universe(2018)·2 citations
09
[Submitted on 29 Nov 2018] (cross-list from hep-ph)
Jet fragmentation in a dense QCD medium
Paul Caucal🇫🇷 · Edmond Iancu🇫🇷 · Alfred H. Mueller🇺🇸 · Gregory Soyez🇫🇷
We study the fragmentation of a jet propagating in a dense quark-gluon plasma. Using a leading, double-logarithmic approximation in perturbative QCD, we compute for the first time the effects of the medium on the vacuum-like emissions. We show that, due to the scatterings off the plasma, the in-medium parton showers differ from the vacuum ones in two crucial aspects: their phase-space is reduced and the first emission outside the medium can violate angular ordering. We compute the jet fragmentation function and find results in qualitative agreement with measurements at the LHC.
Comments:
11 pages, 8 figures, XIII Quark Confinement and the Hadron Spectrum - Confinement2018. arXiv admin note: text overlap with arXiv:1807.11229
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1811.12275 [pdf]
PoS(2019)·1 citation
10
[Submitted on 29 Nov 2018] (cross-list from hep-ph)
Multi-winding flux tubes in CFL quark matter
Alexander Haber🇺🇸 · Andreas Schmitt🇬🇧
Color-flavor locked quark matter can be described as a three-component superconductor and thus shows unconventional behavior in the transition regime from type-I to type-II superconductivity. We discuss this behavior by studying magnetic line defects in a Ginzburg-Landau approach, taking into account all possible values of the three winding numbers. After a brief discussion of the defects that include baryon circulation we focus on pure magnetic flux tubes. We show that at strong coupling, relevant for neutron stars, type-II behavior is conceivable and the most preferred configuration has minimal total winding. Only at weak coupling we find a regime where multi-winding flux tubes are preferred, although this regime most likely requires an unrealistically large superconducting gap.
Comments:
12 pages, 3 figures, proceedings contribution to "XIIIth Quark Confinement and the Hadron Spectrum", 31 July - 6 August 2018, Maynooth University, Ireland
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
1811.12302 [pdf]
PoS(2018)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE