Nuclear Theory·nucl-th

Wednesday·May 4, 2022

6 papers—3 primary·3 cross-listed

04
[Submitted on 2 May 2022] (cross-list from hep-ph)
Brief history of the pion-nucleon sigma term
J. M. Alarcón🇪🇸
The pion-nucleon sigma term is a quantity involved in many important aspects of particle and nuclear physics. In this review I show its origin and how it is connected to important questions as the origin of mass of the ordinary matter, studies of dark matter detection and nucleosynthesis. I mention the most common methods used to obtain the sigma term, and comment on the extracted values. As it is shown, the accepted value of the sigma term has been moving from relatively low ( $\sim 40$ MeV) to larger ones ( $\sim 60$ MeV) until today, where this controversy still persist.
Comments:
Invited review for European Physical Journal Special Topics (REVTeX version). 34 pages, 5 figures. Accepted for publication on 10 May 2021
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
2205.01108 [pdf]
Eur.Phys.J.ST(2021)·26 citations
05
[Submitted on 2 May 2022] (cross-list from hep-ph)
Exotic heavy hadrons with a three-body nature
A. Martinez Torres🇧🇷 · Brenda B. Malabarba🇧🇷 · Xiu-Lei Ren🇩🇪 · K. P. Khemchandani🇧🇷 · L. S. Geng🇨🇳
In this talk we present a summary of our latest results on the investigation of three-body systems with explicit/hidden charm and with explicit/hidden strangeness. To be more concrete, in case of explicit strangeness quantum number, we pay attention on the $K D D$ and $K D D ˉ^{*}$ systems, where, in the former, a charm $+ 2$ , isospin $1/2$ and strangeness $+ 1$ state is obtained with a mass around 4140 MeV, while in the latter, a $K^{*}$ state, with hidden charm, and a mass close to 4307 MeV is found. In case of hidden strangeness, the $D K K ˉ$ system is studied, while in the hidden charm and no strangeness quantum numbers sector, the $N D D ˉ^{*}$ system is investigated. In the former a meson $D$ with mass around 2900 MeV is found to be generated, while in the latter several $N^{*}$ and $Δ^{*}$ states with hidden charm are obtained with masses about $4600$ MeV. All these states constitute predictions of our model and future experimental confirmation of them would be relevant to elucidate the properties of the strong interaction in the presence of heavy quarks.
Comments:
XV International Workshop on Hadron Physics (XV Hadron Physics), 13 -17 September 2021, São José dos Campos, Brazil
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2205.01195 [pdf]
PoS(2022)·0 citations
06
[Submitted on 2 May 2022] (cross-list from nucl-ex)
Detailed Study of Quark-Hadron Duality in Spin Structure Functions of the Proton and Neutron
Victoria Lagerquist🇺🇸 · Sebastian E. Kuhn🇺🇸 · Nobuo Sato🇺🇸
In this paper, we present for the first time comprehensive and detailed results on the correspondence between the extrapolated deep inelastic structure function $g_{1}$ of both the proton and the neutron with the same quantity measured in the nucleon resonance region. We use a QCD parameterization of the world data on DIS spin structure functions, extrapolated into the nucleon resonance region and averaged over various intervals in the scaling variable $x$ . We compare the results with the large data set collected in the quark-hadron transition region by the CLAS collaboration, averaged over the same intervals. We present this comparison as a function of the momentum transfer $Q^{2}$ . We find that, depending on the averaging interval and the minimum momentum transfer chosen, a clear transition to quark-hadron duality can be observed in both nucleon species. Furthermore, we show, for the first time, the scaling behavior of $g_{1}$ measured in the resonance region at sufficiently high momentum transfer. Our results can be used to quantify the deviations from the applicability of pQCD for data taken at moderate energies, and help with extraction of quark distribution functions from such data.
Comments:
Final version accepted by Phys. Rev. C. Published April 6,2023 (see journal reference below). Copyright 2023 American Physical Society
Subjects:
Nuclear Experiment (nucl-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2205.01218 [pdf]
PRC(2023)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE

Brief history of the pion-nucleon sigma term

Exotic heavy hadrons with a three-body nature

Detailed Study of Quark-Hadron Duality in Spin Structure Functions of the Proton and Neutron

Affiliations