Nuclear Theory·nucl-th

Friday·February 3, 2023

10 papers—5 primary·5 cross-listed

06
Deciding on the anomalous magnetic moment of quarks in a framework of nonlocal NJL model
Chowdhury Aminul Islam🇨🇳 · Mahammad Sabir Ali🇮🇳 · Mei Huang🇨🇳
Anomalous magnetic moment (AMM) of quarks in presence of an external magnetic field has been explored using a nonlocal Nambu\textemdash Jona-Lasinio (NJL) model. Various strengths of AMM differing in orders of magnitude are used in the literature. We explore them in our nonlocal framework to decide on their strength. We checked the validity of using constant AMM of quarks and investigate two different temperature and magnetic field dependent forms. The forms are taken as the AMM being proportional to the i) meanfield and the ii) square of the meanfield. On comparison with the lattice data for both the condensate averages and differences, it turns out that the second choice is the most suitable one, in such an effective model scenario. In the process, we also keep track of the phase diagram in the $T - e B$ plane arising from our model calculation. The outcome is reasonable as far as the lattice QCD result is concerned.
↳ hep-phnucl-th5 citations
07
N-particle irreducible actions for stochastic fluids
Jingyi Chao🇨🇳 · Thomas Schaefer🇺🇸
We construct one- and two-particle irreducible (1PI and 2PI) effective actions for the stochastic fluid dynamics of a conserved density undergoing diffusive motion. We compute the 1PI action at one-loop order, and the 2PI action in two-loop approximation. We derive a set of Schwinger-Dyson equations, and regularize the resulting equations using Pauli-Villars fields. We numerically solve the Schwinger-Dyson equations for a non-critical fluid. We find that higher-loop effects summed by the Schwinger-Dyson renormalize the non-linear coupling. We also find indications of a diffuson-cascade, the appearance $n$ -loop corrections with smaller and smaller exponential suppression.
↳ hep-phnucl-thJHEP(2023)·5 citations
08
Searching for a dark matter particle with anti-protonic atoms
M. Doser🇨🇭 · G. Farrar🇺🇸 · G. Kornakov🇵🇱
A wide range of dark matter candidates have been proposed and are actively being searched for in a large number of experiments, both at high (TeV) and low (sub meV) energies. One dark matter candidate, a deeply bound $uu dd ss$ sexaquark, $S$ , with mass $\sim 2$ GeV (having the same quark content as the hypothesized H-dibaryon, but long lived) is particularly difficult to explore experimentally. In this paper, we propose a scheme in which such a state could be produced at rest through the formation of $p ˉ -^{3}$ He antiprotonic atoms and their annihilation into $S$ + $K^{+} K^{+} π^{-}$ , identified both through the unique tag of a S=+2, Q=+1 final state, as well as through full kinematic reconstruction of the final state recoiling against it.
↳ hep-phnucl-exnucl-thEPJC(2023)·7 citations
09
Study of the $D K$ interaction with femtoscopic correlation functions
Zhi-Wei Liu🇨🇳 · Jun-Xu Lu🇨🇳 · Li-Sheng Geng🇨🇳
The $D K$ interaction in isospin zero is known to be attractive to such an extent that a bound state can be generated, which can be associated with the mysterious $D_{s 0}^{*} (2317)$ . In this work, we calculate the $D K$ femtoscopic correlation function in the coupled-channel framework for different source sizes that can directly probe the strongly attractive $D K$ interaction, which is otherwise inaccessible due to the unstable nature of $D$ and $K$ mesons, and therefore can help elucidate the nature of $D_{s 0}^{*} (2317)$ . We further generalize the study of source size dependence to various interactions, ranging from repulsive, weakly attractive, moderately attractive, and strongly attractive, in a square-well model. We hope that our study can motivate future experimental measurements of the $D K$ correlation function and other interactions relevant to the understanding of the nature of the many exotic hadrons discovered so far.
↳ hep-phhep-exnucl-exnucl-thPRD(2023)·68 citations
10
Tomography of pions and protons via transverse momentum dependent distributions
P. C. Barry🇺🇸 · L. Gamberg🇺🇸 · W. Melnitchouk🇺🇸 · E. Moffat🇺🇸 · D. Pitonyak🇺🇸 · A. Prokudin🇺🇸 · N. Sato🇺🇸
We perform the first simultaneous extraction of parton collinear and transverse degrees of freedom from low-energy fixed-target Drell-Yan data in order to compare the transverse momentum dependent (TMD) parton distribution functions (PDFs) of the pion and proton. We demonstrate that the transverse separation of the quark field encoded in TMDs of the pion is more than $4 σ$ smaller than that of the proton. Additionally, we find the transverse separation of the quark field decreases as its longitudinal momentum fraction decreases. In studying the nuclear modification of TMDs, we find clear evidence for a transverse EMC effect. We comment on possible explanations for these intriguing behaviors, which call for a deeper examination of tomography in a variety of strongly interacting quark-gluon systems.
↳ hep-phhep-exhep-latnucl-thPRD(2023)·49 citations

Affiliations

first authorsco-authorsvia INSPIRE

Deciding on the anomalous magnetic moment of quarks in a framework of nonlocal NJL model

N-particle irreducible actions for stochastic fluids

Searching for a dark matter particle with anti-protonic atoms

Study of the DK interaction with femtoscopic correlation functions

Tomography of pions and protons via transverse momentum dependent distributions

Affiliations

Study of the $D K$ interaction with femtoscopic correlation functions