• Open Access

Two-photon-exchange effect in epenπ+ at small t with the hadronic model and dispersion relation approach

Qian-Qian Guo and Hai-Qing Zhou
Phys. Rev. C 106, 015203 – Published 15 July 2022

Abstract

In this paper, the two-photon-exchange (TPE) effect in epenπ+ at small t is discussed. In the previous work, the TPE contribution with one π intermediate state is estimated numerically within a hadronic model under the pion-dominance approximation. Here we extend the discussion to include one ρ intermediate state. The TPE contribution can be described by one scalar function in the limit me0, the dispersion relation (DR) satisfied by this scalar function is analyzed. The analytic expressions for the imaginary parts of the TPE contributions from one π or one ρ intermediate state are given within the hadronic model. Combining these analytic expressions and the DR, the corresponding real parts of the TPE contributions can be estimated easily at any available region. This can help the further experimental analysis to include the TPE contributions in a convenient way. The numeric results show that the TPE correction with one ρ intermediate state is much smaller than that with one π intermediate state in the current energy region. These results suggest that the TPE contribution with an elastic state is the main TPE contribution in epenπ+ at small t.

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  • Received 30 March 2022
  • Revised 30 May 2022
  • Accepted 6 July 2022

DOI:https://doi.org/10.1103/PhysRevC.106.015203

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Nuclear PhysicsParticles & Fields

Authors & Affiliations

Qian-Qian Guo and Hai-Qing Zhou*

  • School of Physics, Southeast University, NanJing 211189, China

  • *zhouhq@seu.edu.cn

Article Text

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Issue

Vol. 106, Iss. 1 — July 2022

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