Nuclear Theory·nucl-th

Thursday·October 17, 2024

8 papers—1 primary·7 cross-listed

01
[Submitted on 16 Oct 2024]
How Not to Measure a False QCD Critical Point
Zachary Sweger🇺🇸 · Daniel Cebra🇺🇸 · Xin Dong🇺🇸
Fluctuations of conserved charges are a golden channel for measuring a QCD critical point in relativistic heavy-ion collisions. These fluctuations are quantified by measuring high-order cumulants of baryon-number distributions at a given centrality. Using simulated proton-number cumulants as an example, we discuss how the correlation between particle identification and centrality measurements can distort particle-number distributions. These distortions can easily create large fluctuations in high-order cumulants that might be mistaken for a critical-point signature. We show that certain measurement choices can make the analysis more or less vulnerable to these false signals. We motivate this by considering how the two-dimensional probability space of proton-number versus multiplicity is shaped by analysis choices. We then demonstrate this vulnerability with simulated Au+Au collisions at $s_{N N} = 3.9$ GeV in UrQMD, and two toy models of detector responses to certain classes of events. We explain how an analyzer might observe a false critical signature, and how to avoid doing so, even in a challenging experimental environment.
Comments:
12 pages, 14 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex)
arXiv:
2410.12319 [pdf]
0 citations
02
[Submitted on 15 Oct 2024] (cross-list from hep-ph)
Recent theoretical developments in quarkonia production in relativistic heavy ion collisions
Jiaxing Zhao🇩🇪
Quarkonia are golden probes of heavy ion collisions that have attracted much attention from both experimental and theoretical perspectives. This paper will review recent theoretical studies on quarkonium thermal properties, with a particular focus on the heavy quark finite-temperature potential obtained by Lattice QCD and other approaches. Moreover, it will examine the advancements in the real-time evolution of quarkonia in heavy ion collisions.
Comments:
Contribution to: SQM2024
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2410.11917 [pdf]
EPJ Web Conf.(2025)·2 citations
03
[Submitted on 16 Oct 2024] (cross-list from hep-ph)
Testable leptogenesis and $0 ν β β$ decay in extended seesaw model
Gang Li🇨🇳 · Michael J. Ramsey-Musolf🇨🇳 · Supriya Senapati🇺🇸 · Sebastián Urrutia Quiroga🇺🇸
We investigate the possibility of observable neutrinoless double beta decay $(0 ν β β)$ and viable leptogenesis within a low-scale extended inverse seesaw mechanism with additional sterile neutrinos. General effective field theory (EFT) considerations suggest that if there are experimentally observable signatures in $0 ν β β$ -decay and a lepton asymmetry generated by heavy right-handed neutrino decays, thermal leptogenesis is likely to be unviable. However, in this work, we show that in the context of low-scale leptogenesis, one can obtain the observed baryon asymmetry of the universe and observable signatures of $0 ν β β$ decay in the presence of additional sterile neutrinos. In this framework, the light neutrino masses are suppressed by the extended seesaw parameter, $μ$ , thereby allowing for $O (10 TeV)$ right-handed (RH) neutrinos, while avoiding small Yukawa couplings as in other neutrino mass models and near degeneracies in the RH neutrino spectrum as required by the low-scale leptogenesis paradigm. Contributions to the $0 ν β β$ -decay rate from additional sterile neutrinos can be appreciable, while the corresponding contributions to the early universe lepton asymmetry washout rate are suppressed by other parameters not entering the $0 ν β β$ -decay amplitudes. We show that for keV-MeV scale, sterile neutrinos future ton-scale $0 ν β β$ -decay experiments offer potential signals while maintaining viable leptogenesis.
Comments:
11 + 3 pages; 12 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2410.12180 [pdf]
1 citation
04
[Submitted on 16 Oct 2024] (cross-list from hep-ph)
Pion condensation at rotation in magnetic field, electric and scalar potential wells
D. N. Voskresensky🇷🇺
Instability of the charged pion vacuum resulting in the pion condensation is studied within the $λ ∣ ϕ ∣^{4}$ model at the rapid rotation of the system in presence of external fields. Case of the static external scalar and electric square potential wells and the uniform magnetic field is studied in detail. The Meissner and Aharonov-Bohm effects and the London moment are taken into account. Analogies and differences with the behavior of metallic superconductors under the action of the rotation and the external magnetic field are analysed.
Comments:
16 pages, published version, some misprints found in arXiv: 2410.12392 are corrected
Subjects:
High Energy Physics — Phenomenology (hep-ph); Superconductivity (cond-mat.supr-con); Nuclear Theory (nucl-th)
arXiv:
2410.12392 [pdf]
PRD(2025)·9 citations
05
[Submitted on 16 Oct 2024] (cross-list from hep-ph)
Approach to meson-baryon femtoscopy using effective field theories
Álvaro Peña Almazán🇪🇸 · Juan M. Torres-Rincon🇪🇸
We calculate several femtoscopy correlation functions in the strangeness sectors $S = 0$ and $S = - 2$ for meson-baryon interactions. We combine the amplitudes of chiral perturbation theory at leading order with the TROY (T-matrix-based Routine for HadrOn femtoscopY) framework. We consider the correlation function for the $π^{+}$ p and $π^{-}$ p channels, which are currently under analysis by the ALICE collaboration at the LHC. Furthermore, we will show that analogous interactions can be used to reproduce the results for $K_{S} Λ$ correlation functions obtained by ALICE collaboration in PbPb collisions.
Comments:
1+4 pages, 2 figures. Contribution to the proceedings of the 10th International Conference on Quarks and Nuclear Physics (QNP2024)
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2410.12403 [pdf]
PoS(2025)·0 citations
06
[Submitted on 16 Oct 2024] (cross-list from hep-ph)
Revisiting the proton-antiproton scattering using a constituent-quark-model based coupled-channels calculation
P. G. Ortega🇪🇸 · D. R. Entem🇪🇸 · F. Fernandez🇪🇸 · J. Segovia🇪🇸
Motivated by the last experimental and theoretical advances in the analysis of possible baryonium resonances, the $X (1835)$ and their partners, we perform a constituent-quark-model based coupled-channels calculation of the proton-antiproton scattering in order to analyze the possible existence of bound states or near-threshold structures. The used $N N$ potential is derived from a $G$ -parity transformation of the quark-model-based $N N$ interaction which has described well deuteron properties, $N N$ phase shifts, and even hadron-hadron phenomenology. The additional $N N$ annihilation is taken into account by a complex phenomenological potential whose real part is generated by one-pion and one-gluon exchange annihilation potentials and its imaginary part is an energy-independent potential of Gaussian form. Then, all the parameters of the interaction are constrained by the $N N$ sector except those determining the imaginary part of the annihilation potential. Our study concludes that the nucleon-antinucleon dynamics is complex and rich in scattering singularities near the proton-antiproton and neutron-antineutron thresholds.
Comments:
7 pages, 2 figures, 3 tables
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2410.12465 [pdf]
PLB(2025)·7 citations
07
[Submitted on 16 Oct 2024] (cross-list from hep-ph)
Potential of constraining the Fifth Force Using the Earth as a Spin and Mass Source from space
Zheng-Ting Lai🇨🇳 · Jun-Xu Lu🇨🇳 · Li-Sheng Geng🇨🇳 · Kai Wei🇨🇳 · Wei Ji🇩🇪
We explore the potential of conducting an experiment in a low Earth orbit spacecraft and using the Earth as a spin and mass source to constrain beyond-the-standard-model (BSM) long-range spin- and velocity-dependent interactions, which are mediated by the exchange of an ultralight $(m_{Z^{'}} < 1 0^{- 10} eV)$ or massless intermediate vector boson. The high speed of the low Earth orbit spacecraft can enhance the sensitivity to velocity-dependent interactions. The periodicity enables efficient extraction of signals from background noise, thereby improving the experiment's accuracy. Combining these advantages, we demonstrate theoretically that the novel Spacecraft-Earth model can improve existing bounds on these exotic interactions by up to three orders of magnitude, using the China Space Station (CSS) as a representative low-Earth-orbit carrier. Such a model, if successfully implemented, may provide an innovative strategy for detecting ultralight dark matter and yield tighter constraints on certain coupling constants of exotic interactions.
Comments:
9 pages, 6 figures, final version appearing in Chinese Physics Letters
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2410.12469 [pdf]
Chin.Phys.Lett.(2026)·5 citations
08
[Submitted on 16 Oct 2024] (cross-list from hep-ph)
Polarization options in inclusive DIS off tensor polarized deuteron
Wim Cosyn🇺🇸 · Brandon Roldan Tomei🇺🇸 · Alan Sosa🇺🇸 · Allison Zec🇬🇧
In the near future, the Jefferson Lab $b_{1}$ experiment will provide the second measurement of tensor polarized asymmetries in inclusive DIS on the deuteron. In this asymmetry, 4 independent tensor polarized structure functions contribute. This necessitates systematic approximations in the extraction of the leading twist structure function $b_{1}$ from a single tensor asymmetry measurement. Contamination from higher twist structure functions and kinematic effects is discussed here. Using a deuteron convolution model, we quantify the systematic errors from these approximations for two different choices for the target polarization direction (momentum transfer, electron beam direction). For Jefferson Lab 12 GeV kinematics, the systematic error turns out to be comparable between the two polarization options, while at higher $Q^{2}$ values the momentum transfer direction is preferred.
Comments:
11 pages, 11 figures, submitted as part of the EPJA Topical Collection on Tensor Spin Observables
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2410.12764 [pdf]
EPJA(2025)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE