Fri·Sep 16, 2022Friday·September 16, 2022

1. 01*

   Measurement of the lifetime and $\Lambda$ separation energy of ${}_{\Lambda }^3\mathrm{H}$

   ALICE Collaboration

   The most precise measurements to date of the ${}_{\Lambda }^3\mathrm{H}$ lifetime $\tau$ and $\Lambda$ separation energy ${\mathrm{B}}_{\Lambda }$ are obtained using the data sample of Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV collected by ALICE at the LHC. The ${}_{\Lambda }^3\mathrm{H}$ is reconstructed via its charged two-body mesonic decay channel (${}_{\Lambda }^3\mathrm{H}\to$ ${}^3$He + ${\pi }^{-}$ and the charge-conjugate process). The measured values $\tau =[253\pm 11\text{ (stat.)}\pm 6\text{ (syst.)}]$ ps and ${\mathrm{B}}_{\Lambda }=[102\pm 63\text{ (stat.)}\pm 67\text{ (syst.)}]$ keV are compatible with predictions from effective field theories and confirm that the ${}_{\Lambda }^3\mathrm{H}$ structure is consistent with a weakly-bound system.

   nucl-exPRL(2023)·80 citations
2. 02*

   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.

   ↳ hep-exhep-phnucl-exnucl-th21 citations
3. 03*

   Intermittency of charged particles in the hybrid UrQMD+CMC model at energies available at the BNL Relativistic Heavy Ion Collider

   Jin Wu🇨🇳 · Zhiming Li🇨🇳 · Xiaofeng Luo🇨🇳 · Mingmei Xu🇨🇳 · Yuanfang Wu🇨🇳

   Within the framework of intermittency analysis, a search for critical fluctuations is ongoing to locate the possible critical point in the quantum chromodynamics phase diagram. In this study, self-similar critical fluctuations from a critical Monte Carlo (CMC) model have been incorporated into the cascade ultrarelativistic quantum molecular dynamics (UrQMD) model. This hybrid UrQMD+CMC model exhibits a clear power-law behavior of scaled factorial moment for charged particles in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 7.7-200 GeV. By comparing the UrQMD+CMC model results with those from the STAR experiment, it is found that the value of a calculated scaling exponent falls in the range of the experimental measurement when 1-2 \% signal of intermittency fluctuations is added into the UrQMD sample.

   ↳ nucl-thhep-phnucl-exPRC(2022)·10 citations
4. 04*

   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 ${\mu }_B$ 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 ${\mu }_B$ 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 $\mu$ and also for observables which are higher order $\mu$ 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 $\mu$. 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 $\mu$. 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.

   ↳ hep-phhep-latnucl-exnucl-thPoS(2023)·4 citations
5. 05*

   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.

   ↳ astro-ph.HEgr-qchep-thnucl-ex+116 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.