Fri·Feb 28, 2025Friday·February 28, 2025

1. 01*

   Measurement of $\omega$ meson production in pp and p$-$Pb collisions at $\sqrt{{\mathbf{s}}_{\mathrm{NN}}}=5.02$ TeV

   ALICE Collaboration

   We present the measurement of the $p_{\mathrm{T}}$-differential production cross section of $\omega$ mesons in pp and p$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV at midrapidity by ALICE. In addition, the first measurement of the nuclear modification factor $R_{\text{pPb}}$ for $\omega$ mesons at LHC energies is presented, complementing the existing measurements of lighter neutral mesons such as the ${\pi }^0$ and $\eta$. Within the measured $p_{\mathrm{T}}$-range, the $R_{\text{pPb}}$ of $\omega$ mesons is compatible with no cold nuclear matter effects within the uncertainties, consistent with previous measurements at lower energies. The $\omega /{\pi }^0$ ratio is presented for both collision systems, showing no collision system dependence within the uncertainties. The comparison to previously published $\omega /{\pi }^0$ ratios at lower and higher collision energies in pp collisions suggests a decreasing trend of the ratio above $p_{\mathrm{T}}=4$ GeV/$c$ with increasing collision energy. The data in both collision systems are compared to predictions from PYTHIA, EPOS LHC and DPMJET event generators, revealing significant shortcomings in these models' ability to describe the production of $\omega$ mesons.

   nucl-exhep-exPRC(2025)·0 citations
2. 02*

   Investigating the p-${\pi }^{\pm }$ and p-p-${\pi }^{\pm }$ dynamics with femtoscopy in pp collisions at $\sqrt{s}=13$ TeV

   ALICE Collaboration

   The interaction between pions and nucleons plays a crucial role in hadron physics. It represents a fundamental building block of the low-energy QCD dynamics and is subject to several resonance excitations. This work studies the p-${\pi }^{\pm }$ dynamics using femtoscopic correlations in high-multiplicity pp collisions at $\sqrt{s}=13$ TeV measured by ALICE at the LHC. As the final-state interaction between protons and pions is well constrained by scattering experiments and the study of pionic hydrogen, the results give access to information on the particle-emitting source in pp collisions using the femtoscopy methods. The scaling of the source size of primordial protons and pions against their pair transverse mass is extracted. The results are compared with the source sizes studied with p$-$p, ${\text{p–K}}^{+}$, and ${\pi }^{\pm }$-${\pi }^{\pm }$ pairs by ALICE in the same collision system and are found to be in agreement for the different particle pairs. This reinforces recent findings by ALICE of a common emission source for all hadron-pairs in pp collisions at LHC energies. Furthermore, the p-p-${\pi }^{\pm }$ systems are studied using three-particle femtoscopy in pp collisions at $\sqrt{s}=13$ TeV. The presence of three-body effects is analyzed utilizing the cumulant expansion method. In this formalism, the known two-body interactions are subtracted in order to isolate the three-body effects. For both, p-p-${\pi }^{+}$ and p-p-${\pi }^{-}$, a non-zero cumulant is found, indicating effects beyond pairwise interactions. These results give information on the coupling of the pion to multiple nucleons.

   nucl-exhep-exEPJA(2025)·25 citations
3. 03*

   Low-energy neutron cross-talk between organic scintillator detectors

   M. Sénoville🇫🇷 · F. Delaunay🇫🇷 · N. L. Achouri🇫🇷 · N. A. Orr🇫🇷 · B. Carniol🇫🇷 · N. de Séréville🇫🇷 · D. Étasse🇫🇷 · C. Fontbonne🇫🇷 · J.-M. Fontbonne🇫🇷 · J. Gibelin🇫🇷 · J. Hommet🇫🇷 · B. Laurent🇫🇷 and 4 other authors

   A series of measurements have been performed with low-energy monoenergetic neutrons to characterise cross-talk between two organic scintillator detectors. Cross-talk time-of-flight spectra and probabilities were determined for neutron energies from 1.4 to 15.5 MeV and effective scattering angles ranging from $\sim$50{\deg} to $\sim$100{\deg}. Monte-Carlo simulations incorporating both the active and inactive materials making up the detectors showed reasonable agreement with the measurements. Whilst the time-of-flight spectra were very well reproduced, the cross-talk probabilities were only in approximate agreement with the measurements, with the most significant discrepancies ($\sim$40 %) occurring at the lowest energies. The neutron interaction processes producing cross-talk at the energies explored here are discussed in the light of these results.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2025)·0 citations
4. 04*

   Gross-Llewellyn Smith sum rule from lattice QCD

   K. Utku Can🇦🇺 · Joshua A. Crawford🇦🇺 · Roger Horsley🇬🇧 · Paul E. L. Rakow🇬🇧 · Thomas G. Schar🇦🇺 · Gerrit Schierholz🇩🇪 · Hinnerk Stüben🇩🇪 · Ross D. Young🇦🇺 · James M. Zanotti🇦🇺

   We compute the Gross-Llewellyn Smith sum rule, i.e. the lowest odd moment of the parity-violating structure function, $F_3$, of the nucleon from a lattice QCD calculation of the Compton amplitude. Our calculations are performed on $48^3\times 96$ lattices at the $SU(3)$ symmetric point for two lattice spacings. We extract the moments for several values of the current momenta in the range $0.5\lesssim Q^2\lesssim 10{\mathrm{GeV}}^2$, covering both the nonperturbative and perturbative regimes. We compare our moments to the Gross-Llewellyn Smith sum rule and discuss the implications for higher-twist effects, a determination of ${\alpha }_s(Q^2)$ from a hadronic quantity complementing the phenomenological and other lattice approaches, and electroweak box contributions crucial for Cabibbo-Kobayashi-Maskawa matrix unitarity studies.

   ↳ hep-lathep-phnucl-exnucl-thPRD(2025)·3 citations
5. 05*

   Sensitivity of neutron drip lines and neutron star properties to the symmetry energy

   Yeunhwan Lim🇰🇷 · Jeremy W. Holt🇺🇸

   We investigate the influence of the nuclear symmetry energy and its density slope parameter on the neutron dripline and neutron star properties using a semi-classical liquid drop model (LDM) and energy density functionals constrained by chiral effective field theory. To analyze finite nuclei and mass tables, the nuclear symmetry energy at saturation density is fixed, and the surface tension is determined to minimize the root-mean-square deviation of the total binding energy for 2208 nuclei. Correlations between symmetry energy parameters and neutron driplines, crust-core transition densities, and the radii of $1.4\text{msun}$ neutron stars are explored using the LDM framework. Additionally, we examine the relationship between macroscopic properties, such as neutron star radii ($R_{1.4}$), and microscopic properties, including the number of isotopes and the last bound nucleus for $Z=28$, within the LDM context.

   ↳ nucl-thnucl-exPRC(2026)·6 citations
6. 06*

   The ${\eta }^{\prime }N$ interaction from the ${\eta }^{\prime }p$ correlation function

   Natsumi Ikeno🇯🇵

   We evaluate for the first time the ${\eta }^{\prime }p$ femtoscopic correlation function to study the ${\eta }^{\prime }N$ interaction. We find it extremely sensitive to the value of the ${\eta }^{\prime }p$ scattering length, for which at present there exists only very limited information, not even knowing its sign. The measurement of this correlation function would provide much valuable information on the ${\eta }^{\prime }N$ interaction, which could then also be used to settle the issue of possible ${\eta }^{\prime }$ nucleus bound states, an issue attracting much attention in the nuclear physics community.

   ↳ nucl-thhep-exhep-phnucl-exEPJA(2025)·7 citations
7. 07*

   Generative adversarial neural networks for simulating neutrino interactions

   Jose L. Bonilla🇵🇱 · Krzysztof M. Graczyk🇵🇱 · Artur M. Ankowski🇵🇱 · Rwik Dharmapal Banerjee🇵🇱 · Beata E. Kowal🇵🇱 · Hemant Prasad🇵🇱 · Jan T. Sobczyk🇵🇱

   We propose a new approach to simulate neutrino scattering events as an alternative to the standard Monte Carlo generator approach. Generative adversarial neural network (GAN) models are developed to simulate charged current neutrino-carbon collisions in the few-GeV energy range. We consider a simplified framework to generate muon kinematic variables, specifically its energy and scattering angle. GAN models are trained on simulation data from \nuwro{} Monte Carlo event generator. Two GAN models have been obtained: one simulating quasielastic neutrino-nucleus scatterings and another simulating all interactions at given neutrino energy. The models work for neutrino energy ranging from 300 MeV to 10 GeV. The performance of both models has been assessed using two statistical metrics. It is shown that both GAN models successfully reproduce the distribution of muon kinematics.

   ↳ hep-phcs.LGhep-exnucl-ex+1PRD(2025)·5 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.