Thu·Oct 17, 2024Thursday·October 17, 2024

1. 01*

   The EMC Effect of Tritium and Helium-3 from the JLab MARATHON Experiment

   D. Abrams (1) · H. Albataineh (2) · B. S. Aljawrneh (3) · S. Alsalmi (4,5) · D. Androic (6) · K. Aniol (7) · W. Armstrong (8) · J. Arrington (8,9) · H. Atac (10) · T. Averett (11) · C. Ayerbe Gayoso (11) · X. Bai (1) and 120 other authors

   Measurements of the EMC effect in the tritium and helium-3 mirror nuclei are reported. The data were obtained by the MARATHON Jefferson Lab experiment, which performed deep inelastic electron scattering from deuterium and the three-body nuclei, using a cryogenic gas target system and the High Resolution Spectrometers of the Hall A Facility of the Lab. The data cover the Bjorken $x$ range from 0.20 to 0.83, corresponding to a squared four-momentum transfer $Q^2$ range from 2.7 to $11.9\text{gevsq}$, and to an invariant mass $W$ of the final hadronic state greater than 1.84 GeV/$c^2$. The tritium EMC effect measurement is the first of its kind. The MARATHON experimental results are compared to results from previous measurements by DESY-HERMES and JLab-Hall C experiments, as well as with few-body theoretical predictions.

   nucl-exPRL(2025)·10 citations
2. 02*

   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 $\sqrt{s_{NN}}=3.9$ 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.

   ↳ nucl-thhep-exnucl-ex0 citations
3. 03*

   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 ${\pi }^{+}$p and ${\pi }^{-}$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 $K_S\Lambda$ correlation functions obtained by ALICE collaboration in PbPb collisions.

   ↳ hep-phnucl-exnucl-thPoS(2025)·0 citations
4. 04*

   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 $N\overline{N}$ potential is derived from a $G$-parity transformation of the quark-model-based $NN$ interaction which has described well deuteron properties, $NN$ phase shifts, and even hadron-hadron phenomenology. The additional $N\overline{N}$ 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 $NN$ 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.

   ↳ hep-phhep-exhep-latnucl-ex+1PLB(2025)·7 citations
5. 05*

   Imaging neutrons with a position-sensitive monolithic CLYC detector

   J. Lerendegui-Marco🇪🇸 · G. Cisterna · J. Hallam · V. Babiano-Suárez🇪🇸 · J. Balibrea-Correa🇪🇸 · D. Calvo🇮🇹 · I. Ladarescu🇪🇸 · G. de la Fuente🇺🇸 · B. Gameiro🇪🇸 · A. Sanchis-Moltó · P. Torres-Sánchez🇪🇸 · C. Domingo-Pardo🇪🇸

   In this work, we have developed and characterized a position-sensitive CLYC detector that acts as the neutron imaging layer and $\gamma$-ray Compton scatterer of the novel dual \g-ray and neutron imaging system GN-Vision, which aims at simultaneously obtaining information about the spatial origin of \g-ray and neutron sources. We first investigated the performance of large 50$\times$50~mm${}^2$ monolithic CLYC crystals coupled to a pixelated SiPM in terms of energy resolution and neutron-gamma discrimination. The response of two different 95\% ${}^6$Li-enriched CLYC detectors coupled to an array of 8$\times$8 SiPMs was studied in comparison to the results of a conventional photo-multiplier tube. Energy resolution ranging from 6-8\% for the ${}^{137}$Cs peak and a figure of merit of 3-4 for the neutron-gamma discrimination have been obtained. The spatial response of the CLYC-SiPM detector to $\gamma$-rays and neutrons has also been characterized using charge modulation-based multiplexing techniques based on a diode-coupled charge division circuit. Average resolutions close to 5~mm FWHM with good linearity are obtained in the transverse crystal plane. Last, this work presents the first proof-of-concept experiments of the neutron imaging capability using a neutron pinhole collimator attached to the developed position sensitive CLYC detector.

   ↳ physics.ins-detnucl-exphysics.med-phNucl.Instrum.Meth.A(2025)·2 citations
6. 06*

   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.

   ↳ hep-phnucl-exnucl-thEPJA(2025)·4 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.