Tue·Dec 16, 2025Tuesday·December 16, 2025

1. 01*

   Charged energy correlators in small systems with ALICE

   Minyoung Hwang (for the ALICE Collaboration)🇰🇷

   Energy-energy correlators (EECs), which are energy-weighted cross-sections of particle pairs, offer incisive probes into QCD dynamics, across the full scale of jet evolution, by separating energy scales in the jet fragmentation through the angular distance of the resulting particle pairs. Charged EECs probe the energy flux carried by pairs of the same or opposite electric charges. The interplay between energy distribution and charge conservation enables charged EECs to provide novel constraints on hadronization mechanisms. We present the first measurements of two-point charged energy correlators of inclusive jets in pp collisions at $\sqrt{s}=5.02$ TeV using the ALICE detector, and compare them with hadronization models to investigate different confinement mechanisms. We also present measurements in p-Pb collisions, examining cold nuclear matter effects on jet evolution.

   nucl-ex0 citations
2. 02*

   Formation and lifetime measurements of light hypernuclei in Ag+Ag collisions at $\sqrt{{\mathrm{s}}_{\mathrm{NN}}}$ = 2.55 GeV

   R. Abou Yassine🇩🇪 · J. Adamczewski-Musch🇩🇪 · C. Asal🇩🇪 · M. Becker🇩🇪 · A. Belounnas🇫🇷 · A. Blanco🇵🇹 · C. Blume🇩🇪 · L. Chlad🇨🇿 · P. Chudoba🇨🇿 · I. Ciepał🇵🇱 · J. Dreyer🇩🇪 · W.A. Esmail🇩🇪 and 102 other authors

   We present the first observation of ${}_{\mathrm{\Lambda }}^3\mathrm{H}$ and ${}_{\mathrm{\Lambda }}^4\mathrm{H}$ in Ag+Ag collisions at $\sqrt{{\mathrm{s}}_{\mathrm{NN}}}$ = 2.55 GeV, emitted around mid-rapidity. The hypernuclei are reconstructed via their two-body decay channels and identified through their weak-decay topology, employing an artificial neural network for enhanced discrimination. The analysis methodology is validated using $\Lambda$ hyperons. The resulting rapidity distributions, dN/dy, exhibit a bell shape centered at mid-rapidity. The yield of ${}_{\mathrm{\Lambda }}^4\mathrm{H}$ is equal to or exceeds that of ${}_{\mathrm{\Lambda }}^3\mathrm{H}$, which contrasts the measurement from the STAR collaboration at $\sqrt{{\mathrm{s}}_{\mathrm{NN}}}$ = 3 GeV and is consistent with a scenario in which hypernuclei receive feed-down from excited states. The data enable a high-precision measurement of the hypernuclei lifetimes. For the ${}_{\mathrm{\Lambda }}^3\mathrm{H}$, a lifetime of ${\tau }_{{}_{\mathrm{\Lambda }}^3\mathrm{H}}$ = $(239\pm 23(\mathrm{stat})\pm 18(\mathrm{sys}))\mathrm{ps}$, is extracted, consistent on the 1$\sigma$ level with that of the free $\Lambda$. In contrast, the ${}_{\mathrm{\Lambda }}^4\mathrm{H}$ lifetime of ${\tau }_{{}_{\mathrm{\Lambda }}^4\mathrm{H}}$ = $(209\pm 7(\mathrm{stat})\pm 10(\mathrm{sys}))\mathrm{ps}$, shows a 4.5 $\sigma$ deviation from the free $\Lambda$ lifetime. The results consolidate the available world data.

   nucl-exhep-exPLB(2026)·3 citations
3. 03*

   Direct measurement of ${}^{59}$Cu($p$,$\alpha$)${}^{56}$Ni precludes a strong NiCu cycle in Type-I X-ray bursts

   N. Bhathi · J. S. Randhawa · R. Kanungo🇨🇦 · J. Refsgaard · M. Alcorta🇨🇦 · T. Ahn · C. Andreoiu🇨🇦 · D. Bardayan · S. S. Bhattacharjee🇨🇦 · B. Davids🇨🇦 · G. Christian · A. A. Chen🇺🇸 and 27 other authors

   Model-observation comparisons of type-I X-ray bursts (XRBs) can reveal the properties of accreting neutron star systems, including the neutron star compactness. XRBs are powered by nuclear burning and a handful of reactions have been shown to impact the model results. Reactions in the NiCu cycles, featuring a competition between ${}^{59}$Cu($p$,$\gamma$)${}^{60}$Zn and ${}^{59}$Cu($p$,$\alpha$)${}^{56}$Ni, have been shown to be among the most important reactions as they are a critical checkpoint in $rp$-process flow and significantly impact the light curves and burst ashes. We report a direct measurement of ${}^{59}$Cu($p$,$\alpha$)${}^{56}$Ni bringing stringent constraints on this reaction rate. New results rule out a strong NiCu cycle in XRBs, with a negligible degree of recycling, $\le$5\% up to 1.5 GK. The new reaction rate, when varied within new uncertainty limits, shows no impact on one-zone XRB model light-curves tailored for clocked-burster $GS1826-24$, hence removing an important nuclear physics uncertainty in the model-observation comparison.

   ↳ astro-ph.HEnucl-exApJ(2026)·2 citations
4. 04*

   Updated Simulation of GRETA Detector Response and Exploration of Temperature Sensitivity

   Arin Manohar🇺🇸 · Mario Cromaz🇺🇸 · Christopher Campbell🇺🇸 · Heather Crawford🇺🇸 · Marco Salathe🇺🇸

   The Gamma-Ray Energy Tracking Array (GRETA) is a next-generation gamma-ray spectrometer designed to push the frontiers of nuclear structure and astrophysics experiment. Its high sensitivity is enabled by high-precision localization of gamma-ray interactions within its active detector volume, and the subsequent tracking of gamma-ray scattering sequences. In order to perform gamma-ray tracking, we need to simulate signal generation in the detectors accurately. This requires both accurate calculations of charge movement in the semiconductor volume, as well as a faithful reproduction of real-world experimental effects such as the electronics response. This work addresses the fidelity of the calculated signals for GRETA in two ways. An updated approach has been applied to find an optimized parameterization of the electronics response, while the impact of the detector temperature was also explored to best reproduce experimental signals and improve the position localization performance for GRETA. The results suggest that the electronics response can be simplified without impacting performance, and that the response correction parameters can effectively compensate for the changes in signal which arise due to the crystal temperature, resulting in minimal sensitivity of the position resolution to the assumed temperature.

   ↳ physics.ins-detnucl-ex0 citations
5. 05*

   Emergence of thermal recoil jets in high-energy heavy-ion collisions

   Peng Jing🇨🇳 · Yichao Dang🇨🇳 · Yang He🇨🇳 · Shanshan Cao🇨🇳 · Li Yi🇨🇳 · Xin-Nian Wang🇨🇳

   In the established paradigm of jet quenching in relativistic heavy-ion collisions, jets from initial hard parton scatterings are suppressed due to their interaction with the quark-gluon plasma (QGP) as they traverse the hot medium, serving as crucial tomographic probes of QGP properties. The QGP is also capable of absorbing and reprocessing energy deposited by the hard jets into emergent jet-like objects, providing a novel production mechanism of thermal recoil jets. These emergent thermal recoil jets exhibit distinct transverse momentum ($p_{\mathrm{T}}$) and jet-size ($R$) dependencies different from the hard jets, and naturally explain the puzzling observation of the enhanced yields of hadron or photon triggered jets at large azimuthal angle and solely at small $p_{\mathrm{T}}$ and large $R$. These thermal recoil jets are predicted to have unique substructures, such as their jet shape that increases with the radius and the thermal-like distribution of their constituents, which can be verified in future experimental analyses.

   ↳ nucl-thhep-phnucl-exPRL(2026)·4 citations
6. 06*

   Single-step Quantum Simulation of Two Nucleons

   Bhoomika Maheshwari🇫🇷 · Paul Stevenson🇬🇧 · P. Van Isacker🇫🇷

   Quantum computing offers a scalable approach to solving the nuclear shell model, a highly complex and exponentially scaled many-body problem. This work presents a numerical simulation of the subspace search variational quantum eigensolver (SSVQE) combined with an adaptive derivative-assembles pseudo-trotter (ADAPT) ansatz to obtain the low-lying states of any nuclear system in a single optimization run. As an example, we apply this method in this work to a trivial identical nucleon system, two nucleons in the $0p_{3/2}$ orbital, mapped to 4 qubits depicting m-scheme single-particle states including a surface delta effective interaction using the Jordan-Wigner transformation. The ADAPT-SSVQE algorithm, by utilizing a symmetry-preserving double-excitation ADAPT operator pool, uniquely optimizes a weighted energy sum, forcing the simultaneous convergence of two lowest states within the total angular momentum $M_J=0$ subspace. We demonstrate the accuracy of the method by benchmarking against the exact diagonalization, confirming its potential for probing nuclear structure and pairing phenomena on current and near-future quantum devices without requiring multi-step procedure for excited states.

   ↳ nucl-thhep-thnucl-exquant-phActa Phys.Polon.Supp.(2026)·2 citations
7. 07*

   Sign Reversal of Boer-Mulders Functions from Semi-inclusive Deep-Inelastic Scattering to the Drell-Yan Process

   Jen-Chieh Peng🇺🇸 · Ming-Xiong Liu🇺🇸 · Guanghua Xu🇺🇸

   A striking prediction of QCD on the properties of the novel Transverse Momentum Dependent (TMD) distribution functions is that the time-reversal odd Sivers and Boer-Mulders functions extracted from semi-inclusive deep-inelastic scattering (SIDIS) will undergo a sign reversal in the Drell-Yan (DY) process. This prediction has been tested by experiments that have focused on the Sivers functions so far. We examine the current status on the theoretical prediction and experimental extraction of the signs of the Boer-Mulders functions from SIDIS and DY. We show that the existing SIDIS and DY data are consistent with the predicted sign reversal of the Boer-Mulders functions for proton's valence quark distribution. Prospects for future experiments at EIC capable of testing the sign reversal of the pion Boer-Mulders functions are also discussed.

   ↳ hep-phnucl-exnucl-thPLB(2026)·2 citations
8. 08*

   Probing the pion gluon distribution at small-$x$ in photon-induced interactions at LHC

   Victor P. Goncalves🇧🇷 · Juciene T. de Souza🇧🇷 · Diego Spiering🇧🇷

   In this paper we propose the analysis of the heavy quark photoproduction associated with a leading neutron in hadronic collisions at the LHC as an alternative to probe the pion gluon distribution in a kinematical range not covered by previous experiments. We perform an exploratory study of the charm and bottom photoproduction associated with a leading neutron in proton-proton ($pp$) and proton-lead ($pPb$) collisions, and present calculations for the rapidity distributions and cross-sections. Our predictions indicate that experimental studies of these processes are feasible, and that a future measurement of this final state will be useful to constrain the pion gluon distribution at small values of the Bjorken $x$ variable and to improve our understanding of the pion structure.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2026)·1 citation
9. 09*

   Shell model study of isobaric analog states for $T_z=\pm 2$ nuclei using isospin non-conserving interactions

   Sakshi Shukla🇮🇳 · Praveen C. Srivastava🇮🇳 · Kazunari Kaneko

   In order to comprehend the process underlying mirror energy differences in mirror pairs, we have performed shell-model calculations for $T_z=\pm 2$ $sd$-shell nuclei in the mass range $A$= 20 to 36 and neutron number varying from $N$= 8 to 20. Isospin-symmetry breaking (ISB) is responsible for the mirror energy difference of excited states. We have investigated the {\color{black}isospin non-conserving} interactions: USDC and USDCm to explore the low-lying energy spectra, mirror energy differences, isoscalar ($M_0$), isovector ($M_1$) matrix elements, \textit{E2} transition probability, magnetic ($\mu$), and quadrupole moments ($Q$) of mirror-pair and compared them with their available experimental data. The impact of single-particle states on weakly bound and unbound nuclear states are investigated, especially those of the $s$-wave. We have also analyzed single proton/neutron separation energies and proton/neutron occupancy for ($T_z$=-2)/($T_z$=+2) $sd$-shell nuclei.

   ↳ nucl-thnucl-exJ.Phys.G(2026)·1 citation

* 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.