Thu·Dec 4, 2025Thursday·December 4, 2025

1. 01*

   Precision Measurements of Kinematic Scan for Fluctuations of (Net-)proton Multiplicity Distributions in Au+Au Collisions from RHIC-STAR

   Yige Huang (for the STAR Collaboration)🇨🇳

   This work presents measurements of the rapidity-window dependence of event-by-event net-proton cumulants and proton factorial cumulants in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=$7.7 -- 27 GeV, using high-statistics data from RHIC BES-II. Protons and antiprotons are identified with improved detector performance within $0.4<p_{\mathrm{T}}<2.0$ GeV/$c$ and $|y|<0.6$, enabling a wide coverage in momentum space to probe long-range correlations near the QCD critical point. In the most central collisions, the proton number ${\kappa }_2/{\kappa }_1$ and ${\kappa }_3/{\kappa }_1$ exhibit power-law scaling with the rapidity window, but with exponents below the theoretical expectation, suggesting that the critical point, if it exists, may lie at higher baryon densities. A finite-size scaling analysis of the susceptibility and Binder cumulant study points out a critical baryon chemical potential region in 550 -- 650 MeV.

   nucl-exhep-exEPJ Web Conf.(2026)·2 citations
2. 02*

   Compton suppressed scintillation spectrometer based on a cluster of 9$\times$CeBr${}_3$-NaI(Tl) phoswich detectors

   Mark Povolotskiy · Yuri Sobolev🇷🇺 · Sergei Stukalov🇷🇺

   Measurements of the characteristics of an Compton suppressed spectrometer consisting of 9$\times$CeBr${}_3$-NaI(Tl) phoswich detectors surrounded by four CsI(Tl) scintillation detectors intended for suppressing the Compton component of the spectrum have been carried out. Measurements were performed using gamma and neutron radiation sources. Key parameters of the spectrometer have been determined: the suppression factor of the Compton part of the $\gamma$-spectrum, as well as the dependencies of the neutron detection efficiency on their energy at various detection threshold values.

   ↳ physics.ins-detnucl-exPhys.Part.Nucl.Lett.(2026)·0 citations
3. 03*

   Search for the $Y(2175)$ in the photoproduction cross section measurement of $\gamma p\to \varphi {\pi }^{+}{\pi }^{-}p$ at GlueX

   GlueX Collaboration

   Based on 334 pb${}^{-1}$ of photoproduction data collected with the GlueX detector at Jefferson Lab, we have measured for the first time the cross section of the exclusive reaction $\gamma +p\to \varphi (1020){\pi }^{+}{\pi }^{-}p$ by reconstructing the final state $K^{+}{K}^{-}{\pi }^{+}{\pi }^{-}p$ produced with a photon beam of energies between $8.0\mathrm{GeV}$ and $11.6\mathrm{GeV}$. Based on the measured differential cross section, we have performed a search for the strangeonium-like exotic candidate $Y(2175)$, recently renamed to $\varphi (2170)$. This state has been reported by different $e^{+}{e}^{-}$ annihilation experiments and it is addressed here for the first time in a photoproduction experiment. We do not find evidence for this state when using the resonance parameters quoted by the Particle Data Group and provide upper limits on the photoproduction cross section. Instead, we find a structure at a mass of $m(\varphi {\pi }^{+}{\pi }^{-})=2.24$ GeV/$c^2$ with a statistical significance of about 5 $\sigma$. The parameters of this structure differ from those quoted by the Particle Data Group for the $\varphi (2170)$ and are consistent with a previous observation in $e^{+}{e}^{-}$ annihilation. In addition, there is evidence for a second structure at 1.82 GeV/$c^2$.

   ↳ hep-exnucl-exPRL(2026)·2 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.