Distorted spin-dependent spectral function of an A=3 nucleus and semi-inclusive deep-inelastic scattering processes

L. P. Kaptari, A. Del Dotto, E. Pace, G. Salmè, and S. Scopetta
Phys. Rev. C 89, 035206 – Published 27 March 2014

Abstract

The distorted spin-dependent spectral function of a nucleon inside an A=3 nucleus is introduced as a novel tool for investigating the polarized electron scattering off polarized He3 in the semi-inclusive DIS regime (SiDIS), going beyond the standard plane-wave impulse approximation. This distribution function is applied to the study of the spectator SiDIS, He3(e,eH2)X, to properly take into account the final-state interaction between the hadronizing quark and the detected deuteron, with the final goal of a more reliable extraction of the polarized parton distribution g1(x) inside a bound proton. Our analysis allows one to single out two well-defined kinematical regions where the experimental asymmetries could yield very interesting information: the region where the final-state effects can be minimized, and therefore the direct access to the parton distributions in the proton is feasible, and the one where the final-state interaction dominates, and the spectator SiDIS reactions can elucidate the mechanism of the quark hadronization itself. The perspectives of extending our approach (i) to the mirror nucleus, H3, for achieving a less model-dependent flavor decomposition and (ii) to the asymmetries measured in the standard SiDIS reactions, e+He3e+h+X, with h a detected fast hadron, with the aim of extracting the neutron transversity, are discussed.

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  • Received 11 July 2013
  • Revised 8 November 2013

DOI:https://doi.org/10.1103/PhysRevC.89.035206

©2014 American Physical Society

Authors & Affiliations

L. P. Kaptari1,2,3, A. Del Dotto4, E. Pace5, G. Salmè6, and S. Scopetta1

  • 1Department of Physics and Geology, University of Perugia, and Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, Via Alessandro Pascoli, Perugia I-06123, Italy
  • 2Thomas Jefferson National Accelerator Facility Newport News, Virginia 23606, USA
  • 3Bogoliubov Laboratory of Theoretical Physics, JINR, 141980 Dubna, Russia
  • 4Department of Physics and Mathematics, University of Rome “Roma Tre” and Istituto Nazionale di Fisica Nucleare, Sezione di “Roma Tre,” Via della Vasca Navale 84, 00146 Rome, Italy
  • 5Physics Department, University of Rome “Tor Vergata” and Istituto Nazionale di Fisica Nucleare, Sezione di Tor Vergata, Via della Ricerca Scientifica 1, I-00133 Rome, Italy
  • 6Istituto Nazionale di Fisica Nucleare, Sezione di Roma, Piazzale Aldo Moro 2, I-00185 Rome, Italy

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Issue

Vol. 89, Iss. 3 — March 2014

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