Nuclear Theory·nucl-th

Thursday·July 11, 2019

9 papers—5 primary·4 cross-listed

06
[Submitted on 9 Jul 2019] (cross-list from hep-ph)
Toward an effective theory of quarkonium production in nuclear matter
Ivan Vitev🇺🇸
These proceedings are dedicated to Miklos Gyulassy's 70 $^{th}$ birthday. In his long and distinguished career he has made seminal contributions to many areas of heavy ion theory, including early papers on quarkonium phenomenology in fixed-target heavy ion experiments. Theoretical and experimental studies of the $J / ψ$ and $Υ$ states have evolved considerably in the past decades, and I describe a recent generalization of non-relativistic Quantum Chromodynamics to include interactions in a generic nuclear medium. NRQCD with Glauber gluons aims to provide a universal microscopic description of the interaction of heavy quarkonia in a range of phases that include cold nuclear matter, dense hadron gas, and quark-gluon plasma. Such effective field theory is an important step toward understanding the common trends in proton-nucleus and nucleus-nucleus data on quarkonium suppression.
Comments:
7 pages, Proceedings of the Symposium dedicated to Miklos Gyulassy's 70th birthday, 13th International Workshop in High pT Physics in the RHIC and LHC Era
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1907.04419 [pdf]
PoS(2020)·1 citation
07
[Submitted on 10 Jul 2019] (cross-list from hep-ph)
Hyperon production in $Λ_{c}^{+} \to K^{-} p π^{+}$ and $Λ_{c}^{+} \to K_{S}^{0} p π^{0}$
Jung Keun Ahn🇰🇷 · Seongbae Yang🇰🇷 · Seung-il Nam🇰🇷
We investigate $S = - 1$ hyperon production from the $Λ_{c}^{+} \to K^{-} p π^{+}$ and $Λ_{c}^{+} \to K_{S}^{0} p π^{0}$ decays within the effective Lagrangian approach. We consider the $Σ/Λ$ ground states, $Λ (1520)$ , $Λ (1670) (J^{p} = 1/ 2^{-})$ , $Λ (1890) (J^{p} = 3/ 2^{+})$ ; $Λ/Σ$ -pole contributions from the combined resonances between 1800 MeV and 2100 MeV; and $N /Δ$ -pole and $K^{*}$ -pole contributions, which include the proton, $Δ (1232)$ , and $K (892)$ . We calculate the Dalitz plot density $(d^{2} Γ/ d M_{K^{-} p} d M_{K^{-} π^{+}}$ ) for the $Λ_{c}^{+} \to K^{-} p π^{+}$ decay. The calculated result is in good agreement with experimental data from the Belle Collaboration. Using the parameters from the fit, we present the Dalitz plot density for the $Λ_{c}^{+} \to K_{S}^{0} p π^{0}$ decay. In our calculation, a sharp peak-like structure near 1665 MeV is predicted in the $Λ_{c}^{+} \to K^{-} p π^{+}$ decay because of the interference effects between the $Λ (1670)$ resonance and $η$ - $Λ$ loop channels. We also demonstrate that we can access direct information regarding the weak couplings of $Λ (1670)$ and $Σ (1670)$ from the $Λ_{c}^{+} \to K_{S}^{0} p π^{0}$ decay. Finally, a possible interpretation for the 1665 MeV structure beyond our prediction is briefly discussed.
Comments:
8 pages, 8 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1907.04475 [pdf]
PRD(2019)·11 citations
08
[Submitted on 10 Jul 2019] (cross-list from nucl-ex)
Masses of ground and isomeric states of $^{101}$ In and configuration-dependent shell evolution in odd- $A$ indium isotopes
X. Xu🇨🇳 · J. H. Liu🇨🇳 · C. X. Yuan🇨🇳 · Y. M. Xing🇨🇳 · M. Wang🇨🇳 · Y. H. Zhang🇨🇳 · X. H. Zhou🇨🇳 · Yu. A. Litvinov🇨🇳 · K. Blaum🇩🇪 · R. J. Chen🇨🇳 · X. C. Chen🇨🇳 · C. Y. Fu🇨🇳 and 31 other authors
We report first precision mass measurements of the $1/ 2^{-}$ isomeric and $9/ 2^{+}$ ground states of $^{101}$ In. The determined isomeric excitation energy continues a smooth trend of odd- $A$ indium isotopes up to the immediate vicinity of $N = 50$ magic number. This trend can be confirmed by dedicated shell model calculations only if the neutron configuration mixing is considered. We find that the single particle energies are different for different states of the same isotope. The presented configuration-dependent shell evolution, type II shell evolution, in odd- $A$ nuclei is discussed for the first time. Our results will facilitate future studies of single-particle neutron states.
Comments:
5 pages, 5 figures, submitted to physical review C, under review
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1907.04584 [pdf]
PRC(2019)·21 citations
09
[Submitted on 5 Jul 2019] (cross-list from astro-ph.HE)
Phase transitions in neutron stars and their links to gravitational waves
Milva G. Orsaria🇦🇷 · Germán Malfatti🇦🇷 · Mauro Mariani🇦🇷 · Ignacio F. Ranea-Sandoval🇦🇷 · Federico García🇫🇷 · William M. Spinella🇺🇸 · Gustavo A. Contrera🇦🇷 · Germán Lugones🇧🇷 · Fridolin Weber🇺🇸
The recent direct observation of gravitational wave event $G W 170817$ and its $GR B 170817 A$ signal has opened up a new window to study neutron stars and heralds a new era of Astronomy referred to as the Multimessenger Astronomy. Both gravitational and electromagnetic waves from a single astrophysical source have been detected for the first time. This combined detection offers an unprecedented opportunity to place constraints on the neutron star matter equation of state. The existence of a possible hadron-quark phase transition in the central regions of neutron stars is associated with the appearance of g-modes, which are extremely important as they could signal the presence of a pure quark matter core in the centers of neutron stars. Observations of g-modes with frequencies between 1 kHz and 1.5 kHz could be interpreted as evidence of a sharp hadron-quark phase transition in the cores of neutron stars. In this article, we shall review the description of the dense matter composing neutron stars, the determination of the equation of state of such matter, and the constraints imposed by astrophysical observations of these fascinating compact objects.
Comments:
35 pages, 10 figures
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1907.04654 [pdf]
J.Phys.G(2019)·75 citations

Affiliations

first authorsco-authorsvia INSPIRE

Toward an effective theory of quarkonium production in nuclear matter

Hyperon production in Λc+​→K−pπ+ and Λc+​→KS0​pπ0

Masses of ground and isomeric states of 101In and configuration-dependent shell evolution in odd-A indium isotopes

Phase transitions in neutron stars and their links to gravitational waves

Affiliations

Hyperon production in $Λ_{c}^{+} \to K^{-} p π^{+}$ and $Λ_{c}^{+} \to K_{S}^{0} p π^{0}$

Masses of ground and isomeric states of $^{101}$ In and configuration-dependent shell evolution in odd- $A$ indium isotopes