Studying 𝜋+⁢𝜋− photoproduction beyond Pomeron exchange

Bibrzycki, Łukasz; Hammoud, Nadine; Mathieu, Vincent; Perry, Robert J.; Akridge, Alex; Fernández-Ramírez, César; Montaña, Gloria; Pilloni, Alessandro; Rodas, Arkaitz; Shastry, Vanamali; Smith, Wyatt A.; Winney, Daniel; Szczepaniak, Adam P.

doi:10.1103/PhysRevD.111.014002

Title: Studying 𝜋⁺⁢𝜋⁻ photoproduction beyond Pomeron exchange

Journal Article · 07 January 2025 · Physical Review D

DOI: https://doi.org/10.1103/PhysRevD.111.014002 · OSTI ID:2497365

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AGH University of Krakow (Poland)
Polish Academy of Sciences, Krakow (Poland); Universitat de Barcelona (Spain)
Universitat de Barcelona (Spain)
Indiana University, Bloomington, IN (United States)
Universidad Nacional de Educación a Distancia (UNED), Madrid (Spain)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Università degli Studi di Messina (Italy); INFN Sezione di Catania (Italy)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Old Dominion University, Norfolk, VA (United States)
The George Washington University, Washington, DC (United States); University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Universität Bonn (Germany)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Indiana University, Bloomington, IN (United States)

Forward photoproduction of 𝜋⁺⁢𝜋⁻ pairs with invariant mass of the order of 𝑚_𝜌 ∼770 MeV is traditionally attributed to Pomeron exchange. Based on a detailed analysis of the CEBAF Large Acceptance Spectrometer photoproduction data collected at photon energies below 4 GeV, it is shown from a study of the angular moments that the dynamics of two-pion photoproduction for |𝑡| ≳ 0.5 GeV² cannot be explained by Pomeron exchange alone. This motivates the development of a new theoretical model of two-pion photoproduction which incorporates both two-pion and pion-nucleon resonant contributions. After fitting free parameters, the model provides an excellent description of the low moments of the angular distribution measured at CLAS and enables an assessment of the relative contributions of particular production mechanisms and an interpretation of the various features of the data in terms of these mechanisms.

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Research Organization:: Indiana University, Bloomington, IN (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: NSFC; National Natural Science Foundation of China (NSFC); National Science Foundation (NSF); National Spain Agency, AEI; Polish high-performance computing infrastructure PLGrid; Polish research; Spanish Ministerio de Ciencia, Innovación y Universidades (MICIU); U.S. National Science Foundation (NSF); USDOE

Contributing Organization:: Joint Physics Analysis Center

Grant/Contract Number:: AC05-06OR23177; FG02-87ER40365; SC0023598

OSTI ID:: 2497365

Report Number(s):: DOE/OR/23177-7516; JLAB-THY--24-4078

Journal Information:: Physical Review D, Journal Name: Physical Review D Journal Issue: 1 Vol. 111; ISSN 2470-0010; ISSN 2470-0029

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Studying 𝜋⁺⁢𝜋⁻ photoproduction beyond Pomeron exchange