Nuclear Theory·nucl-th

Monday·October 18, 2021

9 papers—2 primary·7 cross-listed

03
[Submitted on 14 Oct 2021] (cross-list from astro-ph.HE)
Supernova Preshock Neutronization Burst as a Probe of Non-Standard Neutrino Interactions
Xu-Run Huang🇨🇳 · Shuai Zha🇨🇳 · Lie-Wen Chen🇨🇳
Core-collapse supernova (CCSN) provides a unique astrophysical site for studying neutrino-matter interactions. Prior to the shock-breakout neutrino burst during the collapse of the iron core, a preshock $ν_{e}$ burst arises from the electron capture of nuclei and it is sensitive to the low-energy coherent elastic neutrino-nucleus scattering (CE $ν$ NS) which dominates the neutrino opacity. Since the CE $ν$ NS depends strongly on the non-standard neutrino interactions (NSI) which are completely beyond the standard model and yet to be determined, the detection of the preshock burst thus provides a clean way to extract the NSI information. Within the spherically symmetric general-relativistic hydrodynamic simulation for the CCSN, we investigate the NSI effects on the preshock burst. We find that the NSI can maximally enhance the peak luminosity of the preshock burst almost by a factor of three, reaching a value comparable with that of the shock-breakout burst. Future detection of the preshock burst will have critical implications on astrophysics, neutrino physics and physics beyond the standard model.
Comments:
7 pages, 3 figures. Presentation improved and discussions added. Accepted version to appear in ApJL
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2110.07249 [pdf]
ApJL(2021)·6 citations
04
[Submitted on 14 Oct 2021] (cross-list from nucl-ex)
Neutron transfer in $^{9}$ Be + $^{159}$ Tb system
Malika Kaushik · G. Gupta · V.V. Parkar · S.K. Pandit · Swati Thakur · V. Nanal · A. Shrivastava · R.G. Pillay · H. Krishnamoorthy · K. Mahata · S. Pal · C.S. Palshetkar · K. Ramachandran · Pushpendra P. Singh
One neutron stripping cross sections ( $σ_{- 1 n}$ ) are measured in $^{9}$ Be+ $^{159}$ Tb system in the energy range E $_{c m}$ /V $_{B}$ $\sim$ 0.79 - 1.24 using offline gamma counting technique. The CRC model calculations including the ground state and the 2 $^{+}$ resonance state of $^{8}$ Be, carried out using the FRESCO code, give a reasonable description of the measured data. In addition, comparisons of reduced 1n-stripping cross sections- $σ_{r e d}$ with $^{9}$ Be for different target nuclei (A $\sim$ 150-200), and $σ_{r e d}$ for $^{9}$ Be, $^{6}$ Li with $^{159}$ Tb target are presented. While no strong target dependence is observed with $^{9}$ Be projectile, $σ_{r e d}$ ( $^{9}$ Be) is significantly larger than that for $^{6}$ Li, which is consistent with the Q-value for transfer reactions and breakup threshold energy of projectiles.
Comments:
5 pages, 6 Figures
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2110.07254 [pdf]
EPJA(2021)·6 citations
05
[Submitted on 14 Oct 2021] (cross-list from hep-ph)
The $Z_{cs} (3985)$ structure, if a triangle/kinematic singularity, would disappear when heated in Heavy Ion Collisons
Felipe J. Llanes-Estrada🇪🇸 · Luciano M. Abreu🇧🇷
Triangle and other kinematic singularities are very sensitive to the precise masses and widths of the intervening particles. Therefore, the effect that the heavy-ion collision medium can have on those masses and widths, as captured by finite-temperature field theory and reported in the literature, may erase the singularity from the spectrum if the effect is large enough and the loop completes before the hot gas freezes out. A very timely example is provided by the $Z_{cs} (3985)$ structure recently reported by BES-III in a $(D_{s}^{-} D^{* 0} + D_{s}^{*-} D^{0})$ spectrum recoiling against a $K^{+}$ . If a new hadron, this would be a clear exotic $c c ˉ s u ˉ$ tetraquark candidate, the first of a charmonium-like family with strangeness: to accept this, alternative explanations first need to be tested and discarded. As shown in figure 1, the mass spectrum recoiling against the kaon is near the $m_{D_{s}^{*-}} + m_{D^{0}}$ threshold, whereas the production cross-section seems to peak around that for $s (e^{-} e^{+}) = m_{D_{s 2}^{*+}} + m_{D_{s}^{*-}}$ . Therefore, this structure may well be caused by a triangle with the three charmed mesons $D_{s 2}^{*+} / D_{s}^{*-} / D^{0}$ running in the loop, with the amplitude enhanced at the two thresholds. If so, the structure would be erased from the spectrum in Heavy Ion Collisions, whereas a hadron would continue to exist although with a mass decreased by a few percent as computed by other authors.
Comments:
4 pages, 5 figure files, contribution to Proceedings of the EPS-HEP Conference 2021
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2110.07438 [pdf]
PoS(2022)·5 citations
06
[Submitted on 14 Oct 2021] (cross-list from hep-ph)
Effective range expansion for narrow near-threshold resonances
Vadim Baru🇩🇪 · Xiang-Kun Dong🇨🇳 · Meng-Lin Du🇪🇸 · Arseniy Filin🇩🇪 · Feng-Kun Guo🇨🇳 · Christoph Hanhart🇩🇪 · Alexey Nefediev🇷🇺 · Juan Nieves🇪🇸 · Qian Wang🇨🇳
We discuss some general features of the effective range expansion, the content of its parameters with respect to the nature of the pertinent near-threshold states and the necessary modifications in the presence of coupled channels, isospin violations and unstable constituents. As illustrative examples, we analyse the properties of the $χ_{c 1} (3872)$ and $T_{cc}^{+}$ states supporting the claim that these exotic states have a predominantly molecular nature.
Comments:
15 pages, 1 figure
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
2110.07484 [pdf]
PLB(2022)·91 citations
07
[Submitted on 14 Oct 2021] (cross-list from hep-th)
Hydrodynamic Gradient Expansion Diverges beyond Bjorken Flow
Michal P. Heller🇩🇪 · Alexandre Serantes🇵🇱 · Michał Spaliński🇵🇱 · Viktor Svensson🇵🇱 · Benjamin Withers🇬🇧
The gradient expansion is the fundamental organising principle underlying relativistic hydrodynamics, yet understanding its convergence properties for general nonlinear flows has posed a major challenge. We introduce a simple method to address this question in a class of fluids modelled by Israel-Stewart--type relaxation equations. We apply it to (1+1)-dimensional flows and provide numerical evidence for factorially divergent gradient expansions. This generalises results previously only obtained for (0+1)-dimensional comoving flows, notably Bjorken flow. We also demonstrate that the only known nontrivial case of a convergent hydrodynamic gradient expansion at the nonlinear level relies on Bjorken flow symmetries and becomes factorially divergent as soon as these are relaxed. Finally, we show that factorial divergence can be removed using a momentum space cutoff, which generalises a result obtained earlier in the context of linear response.
Comments:
v1: 9 pages, 4 figures; v2: minor clarifications added, version published in PRL
Subjects:
High Energy Physics — Theory (hep-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th); Fluid Dynamics (physics.flu-dyn)
arXiv:
2110.07621 [pdf]
PRL(2022)·27 citations
08
[Submitted on 14 Oct 2021] (cross-list from quant-ph)
Demonstration of the Rodeo Algorithm on a Quantum Computer
Zhengrong Qian🇺🇸 · Jacob Watkins🇺🇸 · Gabriel Given🇺🇸 · Joey Bonitati🇺🇸 · Kenneth Choi🇺🇸 · Dean Lee🇺🇸
The rodeo algorithm is an efficient algorithm for eigenstate preparation and eigenvalue estimation for any observable on a quantum computer. This makes it a promising tool for studying the spectrum and structure of atomic nuclei as well as other fields of quantum many-body physics. The only requirement is that the initial state has sufficient overlap probability with the desired eigenstate. While it is exponentially faster than well-known algorithms such as phase estimation and adiabatic evolution for eigenstate preparation, it has yet to be implemented on an actual quantum device. In this work, we apply the rodeo algorithm to determine the energy levels of a random one-qubit Hamiltonian, resulting in a relative error of $0.08%$ using mid-circuit measurements on the IBM Q device Casablanca. This surpasses the accuracy of directly-prepared eigenvector expectation values using the same quantum device. We take advantage of the high-accuracy energy determination and use the Hellmann-Feynman theorem to compute eigenvector expectation values for a different random one-qubit observable. For the Hellmann-Feynman calculations, we find a relative error of $0.7%$ . We conclude by discussing possible future applications of the rodeo algorithm for multi-qubit Hamiltonians.
Comments:
13 pages and 4 figures (main), 2 pages (supplemental), final version to appear in Eur. Phys. J. A
Subjects:
Quantum Physics (quant-ph); Nuclear Theory (nucl-th); Computational Physics (physics.comp-ph)
arXiv:
2110.07747 [pdf]
EPJA(2024)·35 citations
09
[Submitted on 14 Oct 2021] (cross-list from hep-lat)
Finite-density QCD, $P T$ symmetry, and exotic phases
Moses A. Schindler🇺🇸 · Stella T. Schindler🇺🇸 · Michael C. Ogilvie🇺🇸
We study the phase structure of effective models of finite-density QCD using analytic and lattice simulation techniques developed for the study of non-Hermitian and $P T$ -symmetric QFTs. Finite-density QCD is symmetric under the combined operation of the charge and complex conjugation operators $C K$ , which falls into the class of so-called generalized $P T$ symmetries. We show that $P T$ -symmetric quantum field theories can support patterned ground-state field configurations in the vicinity of a critical endpoint. We apply our methods to a lattice heavy quark model at nonzero chemical potential that displays patterning behavior for a range of parameters. We derive a simple approximate criterion for the formation of these patterns, which can be used with lattice results.
Comments:
9 pages, 3 figures. Proceedings of the 38th International Symposium on Lattice Field Theory, LATTICE2021, July 26-30, 2021
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2110.07761 [pdf]
PoS(2022)·8 citations

Affiliations

first authorsco-authorsvia INSPIRE

Supernova Preshock Neutronization Burst as a Probe of Non-Standard Neutrino Interactions

Neutron transfer in 9Be + 159Tb system

The Zcs​(3985) structure, if a triangle/kinematic singularity, would disappear when heated in Heavy Ion Collisons

Effective range expansion for narrow near-threshold resonances

Hydrodynamic Gradient Expansion Diverges beyond Bjorken Flow

Demonstration of the Rodeo Algorithm on a Quantum Computer

Finite-density QCD, PT symmetry, and exotic phases

Affiliations

Neutron transfer in $^{9}$ Be + $^{159}$ Tb system

The $Z_{cs} (3985)$ structure, if a triangle/kinematic singularity, would disappear when heated in Heavy Ion Collisons

Finite-density QCD, $P T$ symmetry, and exotic phases