Photoproduction of pion pairs at high energy and small angles

Gevorkyan, S.; Larin, I.; Miskimen, R.; Smith, E.

doi:10.1103/physrevc.105.065202

Photoproduction of pion pairs at high energy and small angles

Journal Article · Mon Jun 06 00:00:00 EDT 2022 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.105.065202· OSTI ID:1871955

^[1]; ^[2]; Miskimen, R. ^[3]; ^[4]

Joint Institute for Nuclear Research, Dubna (Russia)
Univ. of Massachusetts, Amherst, MA (United States); Alikhanov Institute for Theoretical and Experimental Physics NRC Kurchatov Institute, Moscow (Russia)
Univ. of Massachusetts, Amherst, MA (United States)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Here, we explore the photoproduction mechanisms for charged and neutral pion pairs off a heavy nucleus at threshold. We calculate the production of charged pairs in the Coulomb field of the nucleus in the Born approximation using explicit expressions for the differential cross sections and their connection with the total cross section σ(γγ→π⁺π^-). The production of σ mesons at threshold and their subsequent decay into pions is an important mechanism and is investigated quantitatively in a framework that can be used for both charged and neutral pions. σ mesons can be produced via electromagnetic (photon exchange) or strong (ω exchange) interactions. For neutral pions, another production mechanism consists of the two-step process where charged pions are produced first and then charge exchange into two neutral pions. Differential and total cross sections are computed for each production mechanism.

View Accepted Manuscript (DOE)

Research Organization:: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC05-06OR23177; FG02-88ER40415

OSTI ID:: 1871955

Report Number(s):: DOE/OR/23177-5510; JLAB-PHY-22-3549; arXiv:2201.09923; DE-FG02-88ER40415

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 6 Vol. 105; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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