Nuclear Theory·nucl-th

Tuesday·July 11, 2023

14 papers—8 primary·6 cross-listed

09
[Submitted on 7 Jul 2023] (cross-list from astro-ph.HE)
Thermal behavior as indicator for hyperons in binary neutron star merger remnants
Sebastian Blacker🇩🇪 · Hristijan Kochankovski🇪🇸 · Andreas Bauswein🇩🇪 · Angels Ramos🇪🇸 · Laura Tolos🇪🇸
We provide the first comprehensive study of hyperons in neutron star mergers and quantify their specific impact. We discuss the thermal behavior of hyperonic equations of state~(EoSs) as a distinguishing feature from purely nucleonic models in the remnants of binary mergers using a large set of numerical simulations. Finite temperature enhances the production of hyperons, which leads to a reduced pressure as highly degenerate nucleons are depopulated. This results in a characteristic increase of the dominant postmerger gravitational-wave frequency by up to $\sim 150$ ~Hz compared to purely nucleonic EoS models. By our comparative approach we can directly link this effect to the occurrence of hyperons. Although this feature is generally weak, it is in principle measurable if the EoS and stellar parameters of cold neutron stars are sufficiently well determined. Considering that the mass-radius relations of purely nucleonic and hyperonic EoSs may be indistinguishable and the overall challenge to infer the presence of hyperons in neutron stars, these findings are important as a new route to answer the outstanding question about hyperonic degrees of freedom in high-density matter.
Comments:
9 pages, 7 figures, 2 tables; published in PRD
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
2307.03710 [pdf]
PRD(2024)·39 citations
10
[Submitted on 7 Jul 2023] (cross-list from hep-ph)
Transverse momentum dependent feed-down fractions for bottomonium production
Jacob Boyd🇺🇸 · Sabin Thapa🇺🇸 · Michael Strickland🇺🇸
We extract transverse momentum dependent feed-down fractions for bottomonium production using a data-driven approach. We use data published by the ATLAS, CMS, and LHCb Collaborations for sqrt(s) = 7 TeV proton-proton collisions. Based on this collected data, we produce fits to the differential cross sections for the production of both S- and P-wave bottomonium states. Combining these fits with branching ratios for excited state decays from the Particle Data Group, we compute the feed-down fractions for both the Upsilon(1S) and Upsilon(2S) as a function of transverse momentum. Our results indicate a strong dependence on transverse momentum, which is consistent with prior extractions of the feed-down fractions. When evaluated at the average momentum of the states, we find that approximately 75% of Upsilon(1S) and Upsilon(2S) states are produced directly. Our results for the transverse momentum dependent feed-down fractions are provided in tabulated form so that they can be used by other research groups.
Comments:
10 pages, 6 figures, 5 tables, and associated data files; v2 - published version
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2307.03841 [pdf]
PRD(2023)·6 citations
11
[Submitted on 8 Jul 2023] (cross-list from quant-ph)
Quantum techniques for eigenvalue problems
Dean Lee🇺🇸
This article is a brief introduction to quantum algorithms for the eigenvalue problem in quantum many-body systems. Rather than a broad survey of topics, we focus on providing a conceptual understanding of several quantum algorithms that cover the essentials of adiabatic evolution, variational methods, phase detection algorithms, and several other approaches. For each method, we discuss the potential advantages and remaining challenges.
Comments:
final publication version of invited article for EPJ A Topical Issue "Quantum computing in low-energy nuclear theory"
Subjects:
Quantum Physics (quant-ph); Quantum Gases (cond-mat.quant-gas); Nuclear Theory (nucl-th)
arXiv:
2307.03889 [pdf]
EPJA(2023)·5 citations
12
[Submitted on 10 Jul 2023] (cross-list from hep-ph)
Diffusion and fluctuations of open charmed hadrons in an interacting hadronic medium
Kangkan Goswami🇮🇳 · Kshitish Kumar Pradhan🇮🇳 · Dushmanta Sahu🇮🇳 · Raghunath Sahoo🇮🇳
Heavy quarks are excellent probes to understand the hot and dense medium formed in ultra-relativistic collisions. In a hadronic medium, studying the transport properties, e.g. the drag ( $γ$ ), momentum diffusion ( $B_{0}$ ), and spatial diffusion ( $D_{s}$ ) coefficients of open charmed hadrons can provide useful information about the medium. Moreover, the fluctuations of charmed hadrons can help us to locate the onset of their deconfinement. In this work, we incorporate attractive and repulsive interactions in the well-established van der Waals hadron resonance gas model (VDWHRG) and study the diffusion and fluctuations of charmed hadrons. This study helps us understand the importance of interactions in the system, which affect both the diffusion and fluctuations of charmed hadrons.
Comments:
Same as the published version in Phys. Rev. D
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2307.04396 [pdf]
PRD(2023)·14 citations
13
[Submitted on 10 Jul 2023] (cross-list from hep-ph)
$ϕ (2170)$ decaying to $ϕ π π$ and $ϕ K K ˉ$
Yun-Hua Chen🇨🇳
Within the framework of dispersion theory, we study the the processes $e^{+} e^{-} \to ϕ (2170) \to ϕ π π (K K ˉ)$ . The strong pion-pion final-state interactions, especially the $K K ˉ$ coupled channel in the $S$ -wave, are taken into account in a model-independent way using the Omnès function solution. Through fitting the experimental data of the $π π$ and $ϕ π$ invariant mass distributions of the $e^{+} e^{-} \to ϕ (2170) \to ϕ π^{+} π^{-}$ process, the low-energy constants in the chiral Lagrangian are determined. The theoretical prediction for the cross sections ratio $σ (e^{+} e^{-} \to ϕ (2170) \to ϕ K^{+} K^{-}) / σ (e^{+} e^{-} \to ϕ (2170) \to ϕ π^{+} π^{-})$ is given, which could be useful for selecting the physical solution when the fit to the $e^{+} e^{-} \to ϕ K^{+} K^{-}$ cross section distribution is available in the future. Our results suggest that above the kinematical threshold of $ϕ K K ˉ$ , the mechanism $e^{+} e^{-} \to ϕ K^{+} K^{-}$ with the kaons rescattering to a pion pair plays an important role in the $e^{+} e^{-} \to ϕ π^{+} π^{-}$ transition.
Comments:
14 pages, 3 figures. arXiv admin note: text overlap with arXiv:1902.10957, arXiv:2104.01752
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2307.04403 [pdf]
Universe(2023)·2 citations
14
[Submitted on 10 Jul 2023] (cross-list from hep-ph)
Toward a generative modeling analysis of CLAS exclusive $2 π$ photoproduction
T. Alghamdi🇺🇸 · Y. Alanazi🇺🇸 · M. Battaglieri🇮🇹 · L. Bibrzycki🇵🇱 · A. V. Golda🇷🇺 · A. N. Hiller Blin🇩🇪 · E. L. Isupov🇷🇺 · Y. Li🇺🇸 · L. Marsicano🇮🇹 · W. Melnitchouk🇺🇸 · V. I. Mokeev🇺🇸 · G. Montana🇺🇸 and 4 other authors
AI-supported algorithms, particularly generative models, have been successfully used in a variety of different contexts. In this work, we demonstrate for the first time that generative adversarial networks (GANs) can be used in high-energy experimental physics to unfold detector effects from multi-particle final states, while preserving correlations between kinematic variables in multidimensional phase space. We perform a full closure test on two-pion photoproduction pseudodata generated with a realistic model in the kinematics of the Jefferson Lab CLAS g11 experiment. The overlap of different reaction mechanisms leading to the same final state associated with the CLAS detector's nontrivial effects represents an ideal test case for AI-supported analysis. Uncertainty quantification performed via bootstrap provides an estimate of the systematic uncertainty associated with the procedure. The test demonstrates that GANs can reproduce highly correlated multidifferential cross sections even in the presence of detector-induced distortions in the training datasets, and provides a solid basis for applying the framework to real experimental data.
Comments:
14 pages, 20 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2307.04450 [pdf]
PRD(2023)·15 citations

Affiliations

first authorsco-authorsvia INSPIRE

Thermal behavior as indicator for hyperons in binary neutron star merger remnants

Transverse momentum dependent feed-down fractions for bottomonium production

Quantum techniques for eigenvalue problems

Diffusion and fluctuations of open charmed hadrons in an interacting hadronic medium

ϕ(2170) decaying to ϕππ and ϕKKˉ

Toward a generative modeling analysis of CLAS exclusive 2π photoproduction

Affiliations

$ϕ (2170)$ decaying to $ϕ π π$ and $ϕ K K ˉ$

Toward a generative modeling analysis of CLAS exclusive $2 π$ photoproduction