Soft rescattering in the timelike proton form factor within a spacetime scheme

Andrea Bianconi and Egle Tomasi-Gustafsson
Phys. Rev. C 98, 055204 – Published 28 November 2018

Abstract

The annihilation of a lepton pair into a proton-antiproton pair, and the time-reverse process allow for a measurement of the timelike proton form factors (FFs). This work aims at studying the corrections due to direct soft interactions between the proton and the antiproton before their annihilation or after their creation. The analysis is carried out in the spacetime formalism used by us in a series of recent works on timelike FFs. In particular the effect of p¯p annihilation into many-meson states is considered. We expect it to determine similar real and imaginary parts for the form factor near the p¯p channel threshold. We also discuss the possibility that the timelike FFs differ by a phase in the hadron pair production and annihilation.

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  • Received 15 September 2018

DOI:https://doi.org/10.1103/PhysRevC.98.055204

©2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear PhysicsParticles & Fields

Authors & Affiliations

Andrea Bianconi

  • Dipartimento di Ingegneria dell'Informazione, Università degli Studi di Brescia and Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Brescia, I-25133 Brescia, Italy

Egle Tomasi-Gustafsson

  • IRFU, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette Cedex, France

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Issue

Vol. 98, Iss. 5 — November 2018

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