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Nuclear Theory·nucl-th

Thursday·August 15, 2024

11 papers—6 primary·5 cross-listed

All11Primary6Cross-lists5
  1. 07

    Testing for coherence and nonstandard neutrino interactions in COHERENT data

    Jiajun Liao🇨🇳 · Danny Marfatia🇺🇸 · Jiajie Zhang🇨🇳

    We analyze data from the CsI, liquid Ar and Ge detectors of the COHERENT experiment and confirm within that the measured elastic neutrino-nucleus scattering cross section is proportional to the square of the number of neutrons in the nucleus, as expected for coherent scattering in the standard model. We also show how various degeneracies involving nonstandard neutrino interaction parameters are broken in a combined analysis of the three datasets.

    ↳ hep-phhep-exnucl-exnucl-thPRD(2024)·11 citations
  2. 08

    Are in-medium quark-gluon showers strongly coupled? Results in the large- limit

    Peter Arnold🇺🇸 · Omar Elgedawy🇺🇸 · Shahin Iqbal🇵🇰

    Inside a medium, showers originating from a very high energy particle develop via medium-induced splitting processes such as bremsstrahlung and pair production. During shower development, two consecutive splittings sometimes overlap quantum mechanically, so that they cannot be treated independently. Some of these effects can be absorbed into an effective value of a medium parameter known as . Previous calculations (with certain simplifying assumptions) have found that, after adjusting the value of , the leftover effect of overlapping splittings is quite small for purely gluonic large- showers but is very much larger for large- QED showers, at comparable values of . Here, by investigating the same problem for QCD with *quarks* in the large- limit of many quark flavors, we make a first study of whether the small effect in purely gluonic showers (i) was merely an accident or (ii) is more broadly characteristic of such overlap effects in QCD. We also offer a qualitative explanation for the large size of the effect in QED vs. QCD.

    ↳ hep-phnucl-thJHEP(2025)·13 citations
  3. 09

    Search for baryon junctions in e+A collisions at the Electron Ion Collider

    Niseem Magdy🇺🇸 · Abhay Deshpande🇺🇸 · Roy Lacey🇺🇸 · Wenliang Li🇺🇸 · Prithwish Tribedy🇺🇸 · Zhangbu Xu🇺🇸

    Constituent quarks in a nucleon are the essential elements in the standard ``quark model" associated with the electric charge, spin, mass, and baryon number of a nucleon. Quantum Chromodynamics (QCD) describes nucleon as a composite object containing current quarks (valence quarks and sea (anti-)quarks) and gluons. These subatomic elements and their interactions are known to contribute in complex ways to the overall nucleon spin and mass. In the early development of QCD theory in the 1970s, an alternative hypothesis postulated that the baryon number might manifest itself through a non-perturbative configuration of gluon fields forming a Y-shaped topology known as the gluon junction. In this work, we propose to test such hypothesis by measuring (i) the Regge intercept of the net-baryon distributions for +()Au collisions, (ii) baryon and charge transport in the isobaric ratio between +Ru and +Zr collisions, and (iii) target flavor dependence of proton and antiproton yields at large rapidity, transported from the hydrogen and deuterium targets in (d) collisions. Our study indicates that these measurements at the EIC can help determine what carries the baryon number.

    ↳ hep-phhep-exnucl-exnucl-thEPJC(2024)·3 citations
  4. 10

    TMD phenomenology motivated by nonperturbative structures

    Ted Rogers🇺🇸 · Fatma Aslan🇺🇸 · Mariaelena Boglione🇮🇹 · J. Osvaldo Gonzalez-Hernandez🇮🇹 · Tommaso Rainaldi🇺🇸 · Andrea Simonelli🇺🇸

    This talk summarized work done recently to organize the steps for implementing TMD phenomenology in a way optimized for contexts where the extraction and interpretation of hadronic structures and nonperturbative effects is the primary driving motivation.

    ↳ hep-phhep-thnucl-thPoS(2024)·3 citations
  5. 11

    Dihadron azimuthal asymmetry and light-quark dipole moments at the Electron-Ion Collider

    Xin-Kai Wen🇨🇳 · Bin Yan🇨🇳 · Zhite Yu🇺🇸 · C.-P. Yuan🇺🇸

    We propose a novel method to probe light-quark dipole moments by examining the azimuthal asymmetries between a collinear pair of hadrons in semi-inclusive deep inelastic lepton scattering off an unpolarized proton target at the Electron-Ion Collider. These asymmetries provide a means to observe transversely polarized quarks, which arise exclusively from the interference between the dipole and the Standard Model interactions, thereby depending linearly on the dipole couplings. We demonstrate that this novel approach can enhance current constraints on light-quark dipole operators by an order of magnitude, free from contamination of other new physics effects. Furthermore, it allows for a simultaneous determination of both the real and imaginary parts of the dipole couplings, offering a new avenue for investigating potential -violating effects at high energies.

    ↳ hep-phhep-exnucl-exnucl-thSCPMA(2026)·31 citations

Affiliations

first authorsco-authorsvia INSPIRE