Nuclear Theory·nucl-th

Thursday·December 22, 2022

11 papers—4 primary·7 cross-listed

01
[Submitted on 20 Dec 2022]
Baryon Number Transport, Strangeness Conservation and $Ω$ -hadron Correlations
Xiatong Wu🇺🇸 · Weijie Dong🇨🇳 · Xiaozhou Yu🇨🇳 · Hui Li🇨🇳 · Gang Wang🇺🇸 · Huan Zhong Huang🇺🇸 · Zi-Wei Lin🇺🇸
Although strange quarks are produced in $s s ˉ$ pairs, the ratio of $Ω^{-}$ to $Ω ˉ^{+}$ is greater than one in heavy-ion collisions at lower RHIC energies. Thus the produced $Ω$ hyperons must carry net baryon quantum numbers from the colliding nuclei. We present results of $K$ - $Ω$ correlations from AMPT model simulations of Au+Au collisions at $s_{N N}$ = 14.6 GeV, to probe dynamics for baryon number transport to mid-rapidities at this beam energy. We use both the default and string-melting versions to illustrate how hadronization schemes of quark coalescence and string fragmentations could leave imprints on such correlations. Implications on the measurements of these correlations with the STAR experiment at RHIC will also be discussed.
Comments:
submitted to SQM 2022 conference proceedings
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex)
arXiv:
2212.10568 [pdf]
EPJ Web Conf.(2023)·0 citations
02
[Submitted on 21 Dec 2022]
The complete quantification of parametric uncertainties in (d,p) transfer reactions
M. Catacora-Rios · Amy E.Lovell · Filomena M. Nunes
Previous work quantified the uncertainty associated with the optical potentials between the nucleons and the target. In this study, we extend that work by also including the parameters of the mean field associated with the overlap function of the final bound state, thus obtaining the full parametric uncertainty on transfer observables. We use Bayesian Markov Chain Monte Carlo simulations to obtain parameter posterior distributions. We use elastic-scattering cross sections to constrain the optical potential parameters and use the asymptotic normalization coefficient of the final state to constrain the bound state interaction. We then propagate these posteriors to the transfer angular distributions and obtain confidence intervals for this observable. We study (d,p) reactions on 14C, 16O, and 48Ca at energies in the range E=10-24 MeV. Our results show a strong reduction in uncertainty by using the asymptotic normalization coefficient as a constraint, particularly for those reactions most sensitive to ambiguities in the mean-field. For those reactions, the importance of constraining the bound state interaction is equal to that of constrain the optical potentials. The case of 14C is an outlier because it populates a halo state, and the observable is less sensitive to the nuclear interior. We conclude that when minimal constraints are used on the parameters of the nucleon-target interaction, the 68% confidence interval uncertainties on the differential cross sections are very large (~ 140-185%). However, if elastic-scattering data and the asymptotic normalization coefficient are used in the analysis, with an error of 10% (5%), this uncertainty reduces to ~30% (~15%).
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2212.10698 [pdf]
PRC(2023)·14 citations
03
[Submitted on 21 Dec 2022]
What is ab initio in nuclear theory?
A. Ekström · C. Forssén · G. Hagen · G. R. Jansen · W. Jiang · T. Papenbrock
Ab initio has been used as a label in nuclear theory for over two decades. Its meaning has evolved and broadened over the years. We present our interpretation, briefly review its historical use, and discuss its present-day relation to theoretical uncertainty quantification.
Comments:
Contribution to Research Topic "Uncertainty Quantification in Nuclear Physics" of Frontiers in Physics
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2212.11064 [pdf]
Front.Phys.(2023)·94 citations
04
[Submitted on 21 Dec 2022]
Entanglement generation in few-nucleon scattering
Dong Bai · Zhongzhou Ren
Inspired by a recent Letter [S. R. Beane et al., Phys. Rev. Lett. 122, 102001(2019)], the entanglement generated in the elastic $S$ -wave scattering of $p +^{3} He$ and $n +^{3} H$ is studied, where the proton, neutron, $^{3}$ He, and $^{3}$ H are all regarded as qubits. To deal with the Coulomb interaction between the proton and $^{3}$ He, we derive the entanglement power, a physical quantity that measures the average entanglement generated by a scattering process, for charged qubits within the screening method. The entanglement power in the aforementioned two few-nucleon scatterings is found to be generally much smaller than that in the $S$ -wave $n + p$ scattering at low energies, with the corresponding cluster effective field theories possessing an enhanced approximate $SU (2)_{1} \otimes SU (2)_{2}$ symmetry at leading order. Our study suggests that the entanglement generation capacities of effective interactions between nucleons and light nuclei could be more suppressed than realistic nucleon-nucleon interactions at low energies.
Comments:
7 pages, 4 figures; published version
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2212.11092 [pdf]
PRC(2022)·47 citations
05
[Submitted on 20 Dec 2022] (cross-list from astro-ph.HE)
Constraints on strong phase transitions in neutron stars
Tyler Gorda🇩🇪 · Kai Hebeler🇩🇪 · Aleksi Kurkela🇳🇴 · Achim Schwenk🇩🇪 · Aleksi Vuorinen🇫🇮
We study current bounds on strong first-order phase transitions (PTs) along the equation of state (EOS) of dense strongly interacting matter in neutron stars, under the simplifying assumption that on either side of the PT the EOS can be approximated by a simple polytropic form. We construct a large ensemble of possible EOSs of this form, anchor them to chiral effective field theory calculations at nuclear density and perturbative QCD at high densities, and subject them to astrophysical constraints from high-mass pulsars and gravitational-wave observations. Within this setup, we find that a PT permits neutron-star solutions with larger radii, but only if the transition begins below twice nuclear saturation density. We also identify a large parameter space of allowed PTs currently unexplored by numerical-relativity studies. Additionally, we locate a small region of parameter space allowing twin-star solutions, though we find them to only marginally pass the current astrophysical constraints. Finally, we find that sizeable cores of high-density matter beyond the PT may be located in the centers of some stable neutron stars, primarily those with larger masses.
Comments:
10 pages, 11 figures; version accepted for publication in ApJ. Substantial change from v1 in treatment of matching to chiral EFT in a continuous manner. Figures and discussions updated. Conclusions qualitatively unchanged
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2212.10576 [pdf]
ApJ(2023)·54 citations
06
[Submitted on 21 Dec 2022] (cross-list from hep-ph)
The time-like electromagnetic kaon form factor
A.S. Miramontes🇲🇽 · Adnan Bashir🇲🇽
We compute the electromagnetic charged kaon form factor in the time-like region by employing a Poincaré covariant formalism of the Bethe-Salpeter equation to study quark-antiquark bound states in conjunction with the Schwinger-Dyson equation for the quark propagator. Following a recent kindred calculation of the time-like electromagnetic pion form factor, we include the most relevant intermediate composite particles permitted by their quantum numbers in the interaction kernel to allow for a decay mechanism for the resonances involved. This term augments the usual gluon mediated interaction between quarks. For a sufficiently low energy time-like probing photon, the electromagnetic form factor is saturated by the $ρ (770)$ and $ϕ (1020)$ resonances. We assume $S U (2)$ isospin symmetry throughout. Our results for the absolute value squared of the electromagnetic form factor agree qualitatively rather well and quantitatively moderately so with available experimental data.
Comments:
11 pages, 5 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2212.10800 [pdf]
PRD(2023)·14 citations
07
[Submitted on 21 Dec 2022] (cross-list from physics.hist-ph)
Neutron Star versus Neutral Star: On the 90th anniversary of Landau's publication in astrophysics
Renxin Xu (PKU)
In the late age of developing quantum mechanics, Lev Landau, one of the distinguished players, made great efforts to understand the nature of matter, even stellar matter, by applying the quantum theory. Ninety years ago, he published his idea of "neutron" star, which burst upon him during his visit over Europe in the previous year. The key point that motivated Landau to write the paper is to make a state with lower energy for "gigantic nucleus", avoiding extremely high kinematic energy of electron gas due to the new Fermi-Dirac statistics focused hotly on at that time. Landau had no alternative but to neutronize/neutralize by "combining a proton and an electron", as electron and proton were supposed to be elementary before the discovery of neutron. However, our understanding of the Nature has fundamentally improved today, and another way (i.e., strangeonization) could also embody neutralization and thus a low-energy state that Landau had in mind, which could further make unprecedented opportunities in this multi-messenger era of astronomy. Strangeon matter in "old" physics may impact dramatically on today's physics, from compact stars initiated by Landau, to cosmic rays and dark matter. In this essay, we are making briefly the origin and development of neutron star concept to reform radically, to remember Landau's substantial contribution in astrophysics and to recall those peculiar memories.
Comments:
A contribition to IWARA2022
Subjects:
History and Philosophy of Physics (physics.hist-ph); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2212.10887 [pdf]
Astron.Nachr.(2023)·7 citations
08
[Submitted on 21 Dec 2022] (cross-list from hep-th)
Unobservability of topological charge in nonabelian gauge theory
Nodoka Yamanaka🇯🇵
We show that the topological charge of nonabelian gauge theory is unphysical by using the fact that it always involves the unphysical gauge field component proportional to the gradient of the gauge function. The removal of Gribov copies, which may break the Becchi-Rouet-Stora-Tyutin symmetry, is irrelevant thanks to the perturbative one-loop finiteness of the chiral anomaly. The unobservability of the topological charge immediately leads to the resolution of the Strong CP problem. We also present important consequences such as the physical relevance of axial $U (1)$ symmetry, the $θ$ -independence of vacuum energy, the unphysicalness of topological instantons, and the impossibilities of realizing the sphaleron induced baryogenesis as well as the chiral magnetic effect. The unphysical vacuum angle and the axial $U (1)$ symmetry also imply that the CP phase of the Cabibbo-Kobayashi-Maskawa matrix is the sole source of CP violation of the standard model.
Comments:
5 pages, no figures. Letter. It will be followed by a full paper. Slides explaining graphically the discussion are given in https://www2.yukawa.kyoto-u.ac.jp/~nodoka.yamanaka/topologicalcharge/index.html
Subjects:
High Energy Physics — Theory (hep-th); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2212.10994 [pdf]
17 citations
09
[Submitted on 21 Dec 2022] (cross-list from nucl-ex)
Neutrinoless Double Beta Decay
C. Adams🇺🇸 · K. Alfonso🇺🇸 · C. Andreoiu🇨🇦 · E. Angelico🇺🇸 · I.J. Arnquist🇺🇸 · J.A.A. Asaadi🇺🇸 · F.T. Avignone🇺🇸 · S. N. Axani🇺🇸 · A.S. Barabash🇷🇺 · P.S. Barbeau🇺🇸 · L. Baudis🇨🇭 · F. Bellini🇮🇹 and 220 other authors
This White Paper, prepared for the Fundamental Symmetries, Neutrons, and Neutrinos Town Meeting related to the 2023 Nuclear Physics Long Range Plan, makes the case for double beta decay as a critical component of the future nuclear physics program. The major experimental collaborations and many theorists have endorsed this white paper.
Comments:
white paper submitted for the Fundamental Symmetries, Neutrons, and Neutrinos Town Meeting in support of the US Nuclear Physics Long Range Planning Process
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2212.11099 [pdf]
48 citations
10
[Submitted on 21 Dec 2022] (cross-list from hep-ph)
Odderon as Regge oddball spin-3 in $pp$ and $p p ˉ$ elastic scattering
Jingle B. Magallanes🇵🇭 · Prin Sawasdipol🇹🇭 · Chakrit Pongkitivanichkul🇹🇭 · Daris Samart🇹🇭
In this work, we propose that the odderon is a Regge odd-glueball tensor spin-3. To demonstrate our proposal, we study the $pp$ and $p p ˉ$ elastic scattering by including contributions of the spin-3 odderon and spin-2 pomeron exchange in the processes. The phenomenological effective Lagrangian approach is used to calculate the $pp$ and $p p ˉ$ elastic scattering amplitudes at the tree level. In addition, a Donnachie-Landschoff ansatz of the odderon and pomeron propagators has been used in this work. We fit the theoretical results with the various experimental data of the $pp$ and $p p ˉ$ scattering at the TeV scale to determine the model parameters in the present work. By using the model parameters, the Chew-Frautschi plot of the tensor odderon Regge trajectory is evaluated. As a result, the odderon spin-3 mass is predicted to be 3.2 GeV. In addition, the total cross-section of our model is compatible with the results from TOTEM and its extrapolation from D0 collaboration. Moreover, the total cross-section also satisfies the Friossart bound at the Regge limit.
Comments:
14 pages, 4 figures, and 1 table
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2212.11169 [pdf]
PRD(2024)·4 citations
11
[Submitted on 21 Dec 2022] (cross-list from hep-ph)
Non-strange quark stars within resummed QCD
Tulio E. Restrepo🇧🇷 · Constança Providência🇵🇹 · Marcus Benghi Pinto🇧🇷
The recently developed resummation technique known as {\it renormalization group optimized perturbation theory} (RGOPT) is employed in the evaluation of the EoS describing non-strange cold quark matter at NLO. Inspired by recent investigations, which suggest that stable quark matter can be made only of up and down quarks, the mass-radius relation for two flavor pure quark stars is evaluated and compared with the predictions from perturbative QCD (pQCD) at NNLO. This comparison explicitly shows that by being imbued with renormalization group properties, and a variational optimization procedure, the method allows for an efficient resummation of the perturbative series. Remarkably, when the renormalization scale is chosen so as to reproduce maximum mass stars with M= $2 - 2.3 M_{⊙}$ , one obtains a mass-radius curve compatible with the masses and radii of the pulsars PSR J0740+6620, PSR J0030+0451, and the compact object HESS J1731-347. Moreover, the scale dependence of the EoS (and mass-radius relation) obtained with the RGOPT is greatly improved when compared to that of pQCD. This seminal application to the description of quark stars shows that the RGOPT represents a robust alternative to pQCD when describing compressed quark matter.
Comments:
13 pages, 5 figures, 2 tables
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
2212.11184 [pdf]
PRD(2023)·24 citations

Affiliations

first authorsco-authorsvia INSPIRE