Nuclear Theory·nucl-th

Friday·February 25, 2022

6 papers—3 primary·3 cross-listed

04
Nuclear medium effects in lepton-nucleus DIS in the region of $x ≳ 1$
M. Sajjad Athar🇮🇳 · S. K. Singh🇮🇳 · F. Zaidi🇮🇳
The nuclear medium effects in the nuclear structure functions and differential cross sections in the deep inelastic scattering (DIS) of charged lepton and neutrino from nuclear targets are studied in the region of large $x$ including $x \geq 1$ . The nuclear medium effects due to the Fermi motion and the binding energy of nucleons and the nucleon correlations are included using nucleon spectral function calculated in a microscopic field theoretical model. The numerical results for the nuclear structure functions and the cross sections are obtained using the nucleon structure function evaluated at the next-to-next-to-leading order (NNLO) with the Martin-Motylinski-Harland Lang-Thorne (MMHT) parameterization of the nucleonic parton distribution functions (PDFs) and are compared with the available experimental data on electron scattering from the Jefferson Lab (JLab) and SLAC Nuclear Physics Facility (NPAS). In the case of neutrino scattering the results are relevant for understanding the DIS contributions to the recent inclusive cross sections measured by the Main Injector Neutrino ExpeRiment to study v-A interactions (MINERvA) as well as theoretical predictions are made for Deep Underground Neutrino Experiment (DUNE). The importance of isoscalarity corrections in heavier nuclear targets as well as the effect of the kinematic cut on the CM energy $W$ in defining the DIS region have also been discussed.
↳ hep-phnucl-thPRD(2022)·5 citations
05
Coherent $J / ψ$ electroproduction on $^{4}$ He and $^{3}$ He at the Electron-Ion Collider: probing nuclear shadowing one nucleon at a time
V. Guzey (St. Petersburg, INP)🇷🇺 · M. Rinaldi (Perugia U. and INFN, Perugia)🇮🇹 · S. Scopetta (Perugia U. and INFN, Perugia)🇮🇹 · M. Strikman (Penn State U.)🇺🇸 · M. Viviani (INFN, Pisa)🇮🇹
While the phenomenon of gluon nuclear shadowing at small $x$ has been getting confirmation in QCD analyses of various LHC measurements involving heavy nuclei, it has not been possible so far to establish experimentally the number of target nucleons responsible for nuclear shadowing in a given process. To address this issue, we study coherent $J / ψ$ electroproduction on $^{4}$ He and $^{3}$ He in the kinematics of a future electron-ion collider and show that this process has the power to disentangle the contributions of the interaction with a specific number of nucleons $k$ , in particular, with two nucleons at the momentum transfer $t \neq = 0$ . We predict a dramatic shift of the $t$ -dependence of the differential cross section toward smaller values of $∣ t ∣$ due to a non-trivial correlation between $x$ and $k$ . This calculation, which makes use for the first time of realistic wave functions, provides a stringent test of models of nuclear shadowing and a novel probe of the 3D imaging of gluons in light nuclei. In addition, thanks to this analysis, unique information on the real part of the corresponding scattering amplitude could be accessed.
↳ hep-phhep-exnucl-thPRL(2022)·5 citations
06
Oscillating magnetised hybrid stars under the magnifying glass of multi-messenger observations
Mauro Mariani🇦🇷 · Lucas Tonetto🇮🇹 · M. Camila Rodríguez🇦🇷 · Marcos O. Celi🇦🇷 · Ignacio F. Ranea-Sandoval🇦🇷 · Milva G. Orsaria🇦🇷 · Aurora Pérez Martínez🇪🇸
We model neutron stars as magnetised hybrid stars with an abrupt hadron-quark phase transition in their cores, taking into account current constraints from nuclear experiments and multi-messenger observations. We include magnetic field effects considering the Landau level quantisation of charged particles and the anomalous magnetic moment of neutral particles. We construct the magnetised hybrid equation of state, and we compute the particle population, the matter magnetisation and the transverse and parallel pressure components. We integrate the stable stellar models, considering the dynamical stability for \emph{rapid} or \emph{slow} hadron-quark phase conversion. Finally, we calculate the frequencies and damping times of the fundamental and $g$ non-radial oscillation modes. The latter, a key mode to learn about phase transitions in compact objects, is only obtained for stars with slow conversions. For low magnetic fields, we find that one of the objects of the GW170817 binary system might be a hybrid star belonging to the slow extended stability branch. For magnetars, we find that a stronger magnetic field always softens the hadronic equation of state. Besides, only for some parameter combinations a stronger magnetic field implies a higher hybrid star maximum mass. Contrary to previous results, the incorporation of anomalous magnetic moment does not affect the studied astrophysical quantities. We discuss possible imprints of the microphysics of the equation of state that could be tested observationally in the future, and that might help infer the nature of dense matter and hybrid stars.
↳ astro-ph.HEnucl-thMNRAS(2022)·22 citations

Affiliations

first authorsco-authorsvia INSPIRE

Nuclear medium effects in lepton-nucleus DIS in the region of x≳1

Coherent J/ψ electroproduction on 4He and 3He at the Electron-Ion Collider: probing nuclear shadowing one nucleon at a time

Oscillating magnetised hybrid stars under the magnifying glass of multi-messenger observations

Affiliations

Nuclear medium effects in lepton-nucleus DIS in the region of $x ≳ 1$

Coherent $J / ψ$ electroproduction on $^{4}$ He and $^{3}$ He at the Electron-Ion Collider: probing nuclear shadowing one nucleon at a time