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Nuclear Theory·nucl-th

Monday·September 1, 2025

14 papers—8 primary·6 cross-listed

All14Primary8Cross-lists6
  1. 09

    Revisiting extremely high energy QED bremsstrahlung in matter: large modifications to the LPM effect

    Peter Arnold🇺🇸 · Joshua Bautista🇺🇸 · Omar Elgedawy🇨🇳 · Shahin Iqbal🇵🇰

    Very high energy electrons initiate electromagnetic showers in ordinary matter that branch and multiply through bremsstrahlung and pair production. At extremely high energies, the quantum mechanical duration of these processes becomes longer than the mean free time to elastically scatter from the medium, which leads to a very significant suppression of bremsstrahlung (and pair production) known as the Landau-Pomeranchuk-Migdal (LPM) effect. We revisit the LPM effect for bremsstrahlung of energy from an electron of energy . We find that there are very large corrections to the LPM bremsstrahlung rate for certain regions of due to quantum overlap of bremsstrahlung and subsequent pair production. This possibility was first raised in the 1960s, when it was argued qualitatively that pair production would significantly decrease the bremsstrahlung rate in those regions of compared to the already-suppressed LPM bremsstrahlung rate. We find the opposite -- quantum overlap of bremsstrahlung with pair production significantly *increases* the bremsstrahlung rate compared to the LPM calculation -- and we verify our qualitative arguments with an analytic calculation of the effect.

    ↳ hep-phnucl-thJHEP(2026)·3 citations
  2. 10

    Heavy Quarkonia in the Light-Front Quark Model

    Muhammad Ridwan🇮🇩 · Ahmad Jafar Arifi🇯🇵 · Terry Mart🇮🇩

    We present recent progress in constructing heavy quarkonia light-front wave functions from the light-front quark model, a relativistic framework well-suited for describing partonic structure and hadronic form factors. In this proceeding, we discuss the recent application of the model to the radiative transition such as among other transitions. Additionally, we compare our results on the transition form factor with available lattice QCD data. These show our efforts to deepen our understanding of the structure of heavy quarkonia from light-front model perspective.

    ↳ hep-phnucl-thPoS(2026)·0 citations
  3. 11

    Nuclear suppression in diffractive vector meson production within the color glass condensate framework

    Heikki Mäntysaari🇫🇮 · Hendrik Roch🇺🇸 · Farid Salazar🇺🇸 · Björn Schenke🇺🇸 · Chun Shen🇺🇸 · Wenbin Zhao🇺🇸

    We perform a global Bayesian analysis of diffractive production in and collisions within a Color Glass Condensate based framework. Using data from HERA and the LHC, we find that a simultaneous description of and observables is challenging. Introducing a global -factor to account for theoretical uncertainties improves the agreement with data and enhances the framework's predictive power. We present predictions for integrated cross sections at different photon-nucleus energies and study their -dependence relative to a no-saturation baseline, quantifying nuclear suppression and providing insights into the onset of saturation effects.

    ↳ hep-phnucl-thEPJ Web Conf.(2026)·2 citations
  4. 12

    Small behavior in QCD from maximal entanglement and conformal invariance

    Sebastian Grieninger🇺🇸 · Kun Hao🇨🇳 · Dmitri E. Kharzeev🇺🇸 · Vladimir Korepin🇺🇸

    Recent evidence suggests that, at small Bjorken , QCD evolution drives the proton into a state of maximal entanglement. If the evolution kernel is assumed to be conformally invariant -- as is the case for the Balitsky-Fadin-Kuraev-Lipatov (BFKL) equation -- we can describe it by a conformal field theory. Moreover, the central charge of the corresponding conformal field theory emerges as the key parameter governing the -dependence of both the entanglement entropy and the structure function. Here we apply the exact Bethe Ansatz methods to the quantum spin chain dual to Lipatov's high energy effective action to extract the central charge of the theory, and find that . This implies the small behavior for the structure function -- the prediction that can be tested at the forthcoming Electron-Ion Collider.

    ↳ hep-phhep-thnucl-exnucl-th+1PRD(2026)·5 citations
  5. 13

    Removing cutoff artifacts in the NJL model by a Renormalization Group consistent treatment

    Hosein Gholami🇩🇪 · Marco Hofmann🇩🇪 · Michael Buballa🇩🇪

    We summarize how a renormalization-group (RG)-consistent treatment removes well-known artifacts in NJL-model descriptions of color-superconducting quark matter. We introduce two RG-consistent schemes, "minimal" and "massless", and present analytic solutions for the diquark gap at and for the phase boundary in symmetric massless matter, representing the high-density limit of the model. We compare the pairing gaps, phase diagram, and speed of sound with results obtained using conventional regularization.

    ↳ hep-phastro-ph.HEhep-thnucl-thEPJ Web Conf.(2026)·5 citations
  6. 14

    Lattice evidence that scalar glueballs are small

    Ryan Abbott🇺🇸 · Daniel C. Hackett🇺🇸 · Dimitra A. Pefkou🇺🇸 · Fernando Romero-López🇨🇭 · Phiala E. Shanahan🇺🇸

    This work reports the first calculation of the gravitational form factors (GFFs) of the scalar glueball, performed via lattice field theory in Yang-Mills theory at a single lattice spacing. The glueball GFFs are compared with those of other hadrons as determined in previous lattice calculations, providing strong indications that glueballs have a different gluonic structure than typical hadronic states. A mass radius of 0.263(31) fm is predicted, supporting previous suggestions that the scalar glueball is significantly smaller than other hadrons. These results point towards a potential smoking-gun characteristic to target by experimental glueball searches.

    ↳ hep-lathep-phnucl-thPRL(2026)·11 citations

Affiliations

first authorsco-authorsvia INSPIRE