Nuclear Theory·nucl-th

Friday·September 16, 2022

9 papers—4 primary·5 cross-listed

05
[Submitted on 14 Sept 2022] (cross-list from hep-ex)
Snowmass Neutrino Frontier: Neutrino Interaction Cross Sections (NF06) Topical Group Report
A. B. Balantekin🇺🇸 · S. Gardiner🇺🇸 · K. Mahn🇺🇸 · T. Mohayai🇺🇸 · J. Newby🇺🇸 · V. Pandey🇺🇸 · J. Zettlemoyer🇺🇸 · J. Asaadi🇺🇸 · M. Betancourt🇺🇸 · D. A. Harris🇺🇸 · A. Norrick🇺🇸 · F. Kling🇩🇪 and 5 other authors
A thorough understanding of neutrino cross sections in a wide range of energies is crucial for the successful execution of the entire neutrino physics program. In order to extract neutrino properties, long-baseline experiments need an accurate determination of neutrino cross sections within their detector(s). Since very few of the needed neutrino cross sections across the energy spectrum are directly measured, we emphasize the need for theoretical input and indirect measurements such as electron scattering, which would complement direct measurements. In this report we briefly summarize the current status of our knowledge of the neutrino cross sections and articulate needs of the experiments, ongoing and planned, at energies ranging from CEvNS and supernova neutrino energies to the DUNE and atmospheric neutrino energies.
Comments:
38 pages, 1 figure
Subjects:
High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2209.06872 [pdf]
21 citations
06
[Submitted on 15 Sept 2022] (cross-list from hep-ph)
Analyses of the collective properties of hadronic matter in Au-Au collisions at 54.4 GeV
M. Waqas🇨🇳 · G.X. Peng🇨🇳 · M. Ajaz🇵🇰 · A. Haj Ismail🇦🇪 · E.A. Dawi🇦🇪
We investigated the strange hadrons transverse momentum ( $p_{T}$ ) spectra in Au-Au collision at $s_{N N}$ = 54.4 GeV in the framework of modified Hagedorn function with embedded flow. We extracted the kinetic freeze-out temperature $T_{0}$ , transverse flow velocity $β_{T}$ , kinetic freeze-out volume $V$ , mean transverse momentum $< p_{T} >$ , the entropy parameter $n$ and the multiplicity parameter $N_{0}$ . We reported that all these parameters increase towards the central collisions. The larger kinetic freeze-out temperature , transverse flow velocity, kinetic freeze-out volume and the entropy parameter (n) in central collisions compared to peripheral collisions show the early decoupling of the particles in central collisions. In addition, all the above parameters are mass dependent. The kinetic freeze-out temperature ( $T_{0}$ ), the entropy parameter $n$ and mean transverse momentum ( $< p_{T} >$ ) are larger for massive particles, while the transverse flow velocity ( $β_{T}$ ), kinetic freeze-out volume ( $V$ ) and the multiplicity parameter ( $N_{0}$ ) show the opposite behavior. Larger $T_{0}$ , $n$ and smaller $β_{T}$ as well as $V$ of the heavier particles indicates the early freeze-out of the heavier particles, while larger $< p_{T} >$ for the heavier particles evince that the effect of radial flow is stronger in heavier particles. The separate set of parameters for each particle shows the multiple kinetic freeze-out scenario, where the mass dependent kinetic freeze-out volume shows the volume differential freeze-out scenario. We also checked the correlation among different parameters, which include the correlation of $T_{0}$ and $β_{T}$ , $T_{0}$ and $V$ , $β_{T}$ and $V$ , $< p_{T} >$ and $T_{0}$ , $< p_{T} >$ and $β_{T}$ , $< p_{T} >$ and $V$ , $n$ and $T_{0}$ , $n$ and $β_{T}$ , and $n$ and $V$ , and they all are observed to have positive correlations with each other which validates our results.
Comments:
14 pages, 7 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2209.07073 [pdf]
PRD(2022)·25 citations
07
[Submitted on 15 Sept 2022] (cross-list from hep-ph)
A new way of determining the Lattice QCD equation of state at a finite chemical potential
Sabarnya Mitra🇮🇳 · Prasad Hegde🇮🇳 · Christian Schmidt🇩🇪
The Taylor expansion of thermodynamic observables at a finite baryon chemical potential $μ_{B}$ is an oft-used method to circumvent the well-known sign problem of Lattice QCD. Owing to the associated difficulty and limitations of precision in calculating these high-ordered Taylor coefficients, it becomes essential to look for various resummation schemes which can mitigate the computational cost, besides providing trustworthy estimates of different thermodynamic observables. Recently, a way to exponentially resum the contribution of the first $N$ charge density correlation functions $D_{1}, \dots, D_{N}$ to the Taylor series to all orders in $μ_{B}$ was proposed in Phys. Rev. Lett. 128, 2, 022001 (2022). Since the correlation functions $D_{n}$ are calculated stochastically using estimates from different random volume sources, the resummation formulation gets affected by the biased estimates. These estimates can become very drastic and can radically misdirect the calculations for large values of $N$ and $μ$ and also for observables which are higher order $μ$ derivatives of free energy, specially at lower temperatures. In this work, we present a cumulant expansion procedure that allows to investigate and regulate these biased estimates at different orders in $μ$ . We find that the unbiased estimates in the cumulant expansion can truly capture the genuine higher-order stochastic fluctuations of the higher order correlation functions, which got suppressed by the exponential resummation formulation. Finally, we discover an unbiased formalism of the exponential resummation, which when expanded in a series, can exactly reproduce the Taylor series upto a desired power in $μ$ . We are also able to regain the knowledge of reweighting factor and many other important properties of the partition function, which got entirely lost through the implementation of cumulant expansion scheme.
Comments:
9 pages, 8 figures, Contribution to The 39th International Symposium on Lattice Field Theory (Lattice 2022), minor changes, 2 new references added
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2209.07241 [pdf]
PoS(2023)·4 citations
08
[Submitted on 15 Sept 2022] (cross-list from hep-ph)
Doubly-heavy tetraquark bound states and resonances
Jean-Marc Richard🇫🇷 · Alfredo Valcarce🇪🇸 · Javier Vijande🇪🇸
We review the predictions of the quark model for the doubly-heavy tetraquarks $QQ q ˉ q ˉ$ . The possibility of resonances near the $B B^{*}$ threshold in addition to a deeply bound state is discussed.
Comments:
Talk presented by J.-M. Richard at QCD22, Montpellier (France), July 4-7, 2022
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2209.07372 [pdf]
Nucl.Part.Phys.Proc.(2023)·13 citations
09
[Submitted on 15 Sept 2022] (cross-list from astro-ph.HE)
Snowmass 2021 Cosmic Frontier White Paper: The Dense Matter Equation of State and QCD Phase Transitions
Slavko Bogdanov🇺🇸 · Emmanuel Fonseca🇺🇸 · Rahul Kashyap🇺🇸 · Aleksi Kurkela🇳🇴 · James M. Lattimer🇺🇸 · Jocelyn S. Read🇺🇸 · Bangalore S. Sathyaprakash🇺🇸 · H. Thankful Cromartie🇺🇸 · Tim Dietrich🇩🇪 · Arnab Dhani🇺🇸 · Timothy Dolch · Tyler Gorda🇩🇪 and 17 other authors
Our limited understanding of the physical properties of matter at ultra-high density, high proton/neutron number asymmetry, and low temperature is presently one of the major outstanding problems in physics. As matter in this extreme state is known to only exist stably in the cores of neutron stars (NSs), complementary measurements from electromagnetic and gravitational wave astrophysical observations of NSs, combined with terrestrial laboratory constraints and further theoretical investigations, hold the promise to provide important insight into the properties of matter in a region of the quantum chromodynamics phase space that is otherwise inaccessible. This multidisciplinary endeavor imposes the following requirements for facilities and resources in the upcoming decade and beyond: * A next generation of gravitational wave detectors to uncover more double NS and neutron star-black hole mergers; * Sensitive radio telescopes to find the most massive and fastest spinning NSs; * Large-area, high-time-resolution and/or high angular resolution X-ray telescopes to constrain the NS mass-radius relation; * Suitable laboratory facilities for nuclear physics experiments to constrain the dense matter equation of state; * Funding resources for theoretical studies of matter in this regime; * The availability of modern large-scale high performance computing infrastructure. The same facilities and resources would also enable significant advances in other high-profile fields of inquiry in modern physics such as the nature of dark matter, alternative theories of gravity, nucleon superfluidity and superconductivity, as well as an array of astrophysics, including but not limited to stellar evolution, nucleosynthesis, and primordial black holes.
Comments:
Submitted to the Proceedings of the US Community Study on the Future of Particle Physics (Snowmass 2021) under Cosmic Frontier (CF07: Cosmic probes of fundamental physics); 30 pages, 8 figures
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics — Theory (hep-th); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2209.07412 [pdf]
16 citations

Affiliations

first authorsco-authorsvia INSPIRE

Snowmass Neutrino Frontier: Neutrino Interaction Cross Sections (NF06) Topical Group Report

Analyses of the collective properties of hadronic matter in Au-Au collisions at 54.4 GeV

A new way of determining the Lattice QCD equation of state at a finite chemical potential

Doubly-heavy tetraquark bound states and resonances

Snowmass 2021 Cosmic Frontier White Paper: The Dense Matter Equation of State and QCD Phase Transitions

Affiliations