Mon·Feb 19, 2024Monday·February 19, 2024

1. 01*

   New Chinese Facilities for Short-Range Correlation Physics

   Zhihong Ye🇨🇳 · Haojie Zhang🇨🇳 · Yaopeng Zhang🇨🇳 · Haocen Zhao🇨🇳

   This article explores the significant advancements in Short-Range Correlation (SRC) research enabled by the latest Chinese nuclear physics facilities- CSR at HIRFL, HIAF, SHINE, and the upcoming EicC. These facilities introduce cutting-edge technologies and methodologies, addressing existing challenges and broadening the scope for SRC studies. By providing detailed insights into the capabilities and expected contributions of each facility, the paper highlights China's emerging role in the global nuclear physics landscape. The collaborative potential, alongside complementary global efforts, positions these facilities to deeply influence our understanding of nuclear matter's fundamental properties and interactions.

   nucl-exhep-phEPJA(2024)·7 citations
2. 02*

   The $v_3^{1/3}/v_2^{1/2}$ ratio in PbAu collisions at $\sqrt{s_{\mathrm{NN}}}=$ 17.3 GeV: a hint of a hydrodynamic behavior

   D. Adamová🇨🇿 · G. Agakishiev🇷🇺 · A. Andronic🇩🇪 · D. Antończyk🇩🇪 · H. Appelshäuser🇩🇪 · V. Belaga🇷🇺 · J. Bielčíková🇨🇿 · P. Braun-Munzinger🇩🇪 · O. Busch🇩🇪 · A. Cherlin🇮🇱 · S. Damjanović🇩🇪 · T. Dietel🇩🇪 and 41 other authors

   The Fourier harmonics, $v_2$ and $v_3$ of negative pions are measured at center-of-mass energy per nucleon pair of $\sqrt{s_{\mathrm{NN}}}$= 17.3 GeV around midrapidity by the CERES/NA45 experiment at the CERN SPS in 0--30\% central PbAu collisions with a mean centrality of 5.5\%. The analysis is performed in two centrality bins as a function of the transverse momentum ${\mathrm{p}}_{\mathrm{T}}$ from 0.05 GeV/$c$ to more than 2 GeV/$c$. This is the first measurement of the $v_3^{1/3}/v_2^{1/2}$ ratio as a function of transverse momentum at SPS energies, that reveals, independently of the hydrodynamic models, hydrodynamic behavior of the formed system. For ${\mathrm{p}}_{\mathrm{T}}$ above 0.5 GeV/$c$, the ratio is nearly flat in accordance with the hydrodynamic prediction and as previously observed by the ATLAS and ALICE experiments at the much higher LHC energies. The results are also compared with the SMASH-vHLLE hybrid model predictions, as well as with the SMASH model applied alone.

   nucl-exEPJC(2024)·2 citations
3. 03*

   Understanding perturbative and non-perturbative contributions to jets at RHIC

   Isaac Mooney🇺🇸

   Jets, as collections of multi-scale objects, allow for insight into perturbative (high-momentum) processes, but gaining an understanding of the non-perturbative structure within jets such as hadronization effects and the underlying event has been more difficult. In observables sensitive to these non-perturbative effects, a large discrepancy is observed between partonic calculations and experimental data at RHIC. Grooming techniques such as SoftDrop reduce the impact of these non-perturbative effects and isolate the hard radiation associated with the hard scattering for more direct comparison to perturbative calculations. By analogy, CollinearDrop can be used to isolate non-perturbative contributions from a different region of the emission phase space, or the Lund plane, although no measurement of a CollinearDrop observable has yet been published. In these proceedings, we review recent progress on experimentally accessing the perturbative and non-perturbative contributions to jets and their substructure, and discuss potential future measurements at RHIC as a road map toward precision QCD at the EIC.

   ↳ hep-phhep-exnucl-ex0 citations
4. 04*

   Global Fit of Electron and Neutrino Elastic Scattering Data to Determine the Strange Quark Contribution to the Vector and Axial Form Factors of the Nucleon

   S.F. Pate🇺🇸 · V. Papavassiliou🇺🇸 · J.P. Schaub🇺🇸 · D.P. Trujillo🇺🇸 · M.V. Ivanov🇧🇬 · M.B. Barbaro🇮🇹 · C. Giusti🇮🇹

   We present a global fit of neutral-current elastic (NCE) neutrino-scattering data and parity-violating electron-scattering (PVES) data with the goal of determining the strange quark contribution to the vector and axial form factors of the proton. Previous fits of this form included data from a variety of PVES experiments (PVA4, HAPPEx, G0, SAMPLE) and the NCE neutrino and anti-neutrino data from BNL E734. These fits did not constrain the strangeness contribution to the axial form factor $G_A^s(Q^2)$ at low $Q^2$ very well because there was no NCE data for $Q^2<0.45$ GeV${}^2$. Our new fit includes for the first time MiniBooNE NCE data from both neutrino and anti-neutrino scattering; this experiment used a hydrocarbon target and so a model of the neutrino interaction with the carbon nucleus was required. Three different nuclear models have been employed: a relativistic Fermi gas model, the SuperScaling Approximation model, and a spectral function model. We find a tremendous improvement in the constraint of $G_A^s(Q^2)$ at low $Q^2$ compared to previous work, although more data is needed from NCE measurements that focus on exclusive single-proton final states, for example from MicroBooNE.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2024)·12 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.