Nuclear Theory·nucl-th

Thursday·July 28, 2022

13 papers—8 primary·5 cross-listed

09
[Submitted on 27 Jul 2022] (cross-list from hep-ph)
Exploring Light-Cone Distribution Amplitudes from Quantum Computing
Tianyin Li🇨🇳 · Xingyu Guo🇨🇳 · Wai Kin Lai🇨🇳 · Xiaohui Liu🇨🇳 · Enke Wang🇨🇳 · Hongxi Xing🇨🇳 · Dan-Bo Zhang🇨🇳 · Shi-Liang Zhu🇨🇳
Light-cone distribution amplitudes (LCDAs) are essential nonperturbative quantities for theoretical predictions of exclusive high-energy processes in quantum chromodynamics (QCD). We demonstrate the prospect of calculating LCDAs on a quantum computer by applying a recently proposed quantum algorithm, with staggered fermions, to the simulation of the LCDA in the (1+1)-dimensional Nambu-Jona-Lasinio (NJL) model on classical hardware. The agreement between the result from the classical simulation of the quantum algorithm and that from exact diagonalization justifies the proposed quantum algorithm. We find that the resulting LCDA in the NJL model exhibits features shared with the LCDAs obtained from QCD.
Comments:
8 pages, 7 figures, published version in Sci.China Phys.Mech.Astron
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
arXiv:
2207.13258 [pdf]
SCPMA(2023)·19 citations
10
[Submitted on 17 Jul 2022] (cross-list from astro-ph.HE)
Temperature Effects on Core g-modes of Neutron Stars
Nicholas Lozano · Vinh Tran · Prashanth Jaikumar
Neutron stars provide a unique physical laboratory to study the properties of matter at high density. We study a diagnostic of the composition of high-density matter, namely, g-mode oscillations, which are driven by buoyancy forces. These oscillations can be excited by tidal forces and couple to gravitational waves. We extend prior results for the g-mode spectrum of cold neutron star matter to temperatures that are expected to be achieved in neutron star mergers using a parameterization for finite-temperature effects recently proposed by Raithel, Özel and Psaltis. We find that the g-modes of canonical mass neutron stars ( $\approx$ 1.4 $M_{⊙}$ ) are suppressed at high temperature, and core $g$ -modes are supported only in the most massive ( $\geq$ 2 $M_{⊙}$ ) of hot neutron stars.
Comments:
8 pages, 4 figures
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
arXiv:
2207.13488 [pdf]
Galaxies(2022)·15 citations
11
[Submitted on 27 Jul 2022] (cross-list from hep-ph)
An introductory lecture on Generalised Parton Distributions
Cédric Mezrag🇫🇷
These lecture notes on Generalised Parton Distributions aim at providing a general picture of the field on the theoretical and phenomenological sides to master and Ph.D. students. They go along with the lecture given at the Baryon International School of Physics in 2021.
Comments:
21 pages, 14 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2207.13584 [pdf]
Few Body Syst.(2022)·38 citations
12
[Submitted on 27 Jul 2022] (cross-list from astro-ph.HE)
Plausible presence of new state in neutron stars with masses above $0.98 M_{TOV}$
Ming-Zhe Han🇨🇳 · Yong-Jia Huang🇨🇳 · Shao-Peng Tang🇨🇳 · Yi-Zhong Fan🇨🇳
We investigate the neutron star (NS) equation of state (EOS) by incorporating multi-messenger data of GW170817, PSR J0030+0451, PSR J0740+6620, and state-of-the-art theoretical progresses, including the information from chiral effective field theory ( $χ$ EFT) and perturbative quantum chromodynamics (pQCD) calculation. Taking advantage of the various structures sampling by a single-layer feed-forward neural network model embedded in the Bayesian nonparametric inference, the structure of NS matter's sound speed $c_{s}$ is explored in a model-agnostic way. It is found that a peak structure is common in the $c_{s}^{2}$ posterior, locating at $2.4 - 4.8 ρ_{sat}$ (nuclear saturation density) and $c_{s}^{2}$ exceeds $c^{2} / 3$ at 90\% credibility. The non-monotonic behavior suggests evidence of the state deviating from hadronic matter inside the very massive NSs. Assuming the new/exotic state is featured as it is softer than typical hadronic models or even with hyperons, we find that a sizable ( $\geq 1 0^{- 3} M_{⊙}$ ) exotic core, likely made of quark matter, is plausible for the NS with a gravitational mass above about $0.98 M_{TOV}$ , where $M_{TOV}$ represents the maximum gravitational mass of a non-rotating cold NS. The inferred $M_{TOV} = 2.1 8_{- 0.13}^{+ 0.27} M_{⊙}$ (90\% credibility) is well consistent with the value of $2.1 7_{- 0.12}^{+ 0.15} M_{⊙}$ estimated independently with GW170817/GRB 170817A/AT2017gfo assuming a temporary supramassive NS remnant formed after the merger. PSR J0740+6620, the most massive NS detected so far, may host an exotic core with a probability of $\approx 0.36$ .
Comments:
8+5 pages, 6+5 figures, published in Science Bulletin
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); Instrumentation and Methods for Astrophysics (astro-ph.IM); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
arXiv:
2207.13613 [pdf]
Sci.Bull.(2023)·87 citations
13
[Submitted on 27 Jul 2022] (cross-list from hep-ph)
The two-photon decay of X(6900) from light-by-light scattering at the LHC
Volodymyr Biloshytskyi🇩🇪 · Vladimir Pascalutsa🇩🇪 · Lucian Harland-Lang🇬🇧 · Bogdan Malaescu🇫🇷 · Kristof Schmieden🇩🇪 · Matthias Schott🇩🇪
The LHCb Collaboration has recently discovered a structure around 6.9 GeV in the double- $J / ψ$ mass distribution, possibly a first fully-charmed tetraquark state $X (6900)$ . Based on vector-meson dominance (VMD) such a state should have a significant branching ratio for decaying into two photons. We show that the recorded LHC data for the light-by-light scattering may indeed accommodate for such a state, with a $γ γ$ branching ratio of order of $1 0^{- 4}$ , which is larger even than the value inferred by the VMD. The spin-parity assignment $0^{-+}$ is in better agreement with the VMD prediction than $0^{++}$ , albeit not significantly at the current precision. Further light-by-light scattering data in this region, clarifying the nature of this state, should be obtained in the Run 3 and probably in the high-luminosity phase of the LHC (Run 4 etc.).
Comments:
6 pages, 4 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2207.13623 [pdf]
PRD(2022)·25 citations

Affiliations

first authorsco-authorsvia INSPIRE

Exploring Light-Cone Distribution Amplitudes from Quantum Computing

Temperature Effects on Core g-modes of Neutron Stars

An introductory lecture on Generalised Parton Distributions

Plausible presence of new state in neutron stars with masses above 0.98MTOV​

The two-photon decay of X(6900) from light-by-light scattering at the LHC

Affiliations

Plausible presence of new state in neutron stars with masses above $0.98 M_{TOV}$