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Nuclear Theory·nucl-th

Monday·May 16, 2022

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 04

    ACHILLES: A novel event generator for electron- and neutrino-nucleus scattering

    Joshua Isaacson🇺🇸 · William I. Jay🇺🇸 · Alessandro Lovato🇺🇸 · Pedro A. N. Machado🇺🇸 · Noemi Rocco🇺🇸

    We present a novel lepton-nucleus event generator: ACHILLES, A CHIcagoLand Lepton Event Simulator. The generator factorizes the primary interaction from the propagation of hadrons in the nucleus, which allows for a great deal of modularity, facilitating further improvements and interfaces with existing codes. We validate our generator against high quality electron-carbon scattering data in the quasielastic regime, including the recent CLAS/e4v reanalysis of existing data. We find good agreement in both inclusive and exclusive distributions. By varying the assumptions on the propagation of knocked out nucleons throughout the nucleus, we estimate a component of theoretical uncertainties. We also propose novel observables that will allow for further testing of lepton-nucleus scattering models. ACHILLES is readily extendable to generate neutrino-nucleus scattering events.

    ↳ hep-phhep-exnucl-thPRD(2023)·64 citations
  2. 05

    In-medium polarization tensor in strong magnetic fields (II): Axial Ward identity at finite temperature and density

    Koichi Hattori🇨🇳 · Kazunori Itakura🇯🇵

    We investigate the axial Ward identity (AWI) for massive fermions in strong magnetic fields. The divergence of the axial-vector current is computed at finite temperature and/or density with the help of a relation between the polarization and anomaly diagrams in the effective (1+1) dimensions realized in the lowest Landau level (LLL). We discuss delicate interplay between the vacuum and medium contributions that determines patterns of the spectral flow in the adiabatic limit and, more generally, the diabatic chirality production rate. We also establish an explicit relation between the AWIs from the LLL approximation and from the familiar triangle diagrams in the naive perturbative series with respect to the coupling constant.

    ↳ hep-phastro-ph.HEnucl-thAnnals Phys.(2022)·7 citations
  3. 06

    Coherent pion production in neutrino (anti-neutrino)-nucleus interaction

    Hariom Sogarwal🇮🇳 · Prashant Shukla🇮🇳

    We present a study of coherent pion production in neutrino-nucleus interactions using the formalism based on partially conserved axial current theorem which connects the neutrino-nucleus cross section to the pion-nucleus elastic scattering cross section. Pion-nucleus elastic scattering cross section is calculated using Glauber model which takes three inputs, nuclear densities, pion-nucleon cross section and which is the ratio of real to imaginary part of forward scattering amplitude, for which the parametrizations are obtained from measured data. We calculate the differential and integrated cross sections for charge and neutral current coherent pion production in neutrino (anti-neutrino)-nucleus scattering for a range of nuclear targets from light to heavy materials such as lithium, carbon, hydrocarbon, oxygen, silicon, argon, iron and lead. The results of these cross section calculations are compared with the measured data and with the calculations from the Berger-Sehgal model and GENIE package. There is an excellent agreement between the calculated and measured cross sections with Glauber model. While GENIE and Berger-Sehgal model give a good description of the data in the lower energy range the present calculations describe the data in all energy ranges. Predictions are also made for upcoming experiments like INO and DUNE in the coherent region of neutrino cross section.

    ↳ hep-phnucl-thNPA(2022)·4 citations
  4. 07

    Spatial entanglement in two dimensional QCD: Renyi and Ryu-Takayanagi entropies

    Yizhuang Liu🇵🇱 · Maciej A. Nowak🇵🇱 · Ismail Zahed🇺🇸

    We derive a general formula for the replica partition function in the vacuum state, for a large class of interacting theories with fermions, with or without gauge fields, using the equal-time formulation on the light front. The result is used to analyze the spatial entanglement of interacting Dirac fermions in two-dimensional QCD. A particular attention is paid to the issues of infrared cut-off dependence and gauge invariance. The Renyi entropy for a single interval, is given by the rainbow dressed quark propagator to order . The contributions to order , are shown to follow from the off-diagonal and off mass-shell mesonic T-matrix, with no contribution to the central charge. The construction is then extended to mesonic states on the light front, and shown to probe the moments of the partonic PDFs for large light-front separations. In the vacuum and for small and large intervals, the spatial entanglement entropy following from the Renyi entropy, is shown to be in agreement with the Ryu-Takayanagi geometrical entropy, using a soft-wall AdS model of two-dimensional QCD.

    ↳ hep-phhep-thnucl-thquant-phPRD(2023)·19 citations

Affiliations

first authorsco-authorsvia INSPIRE