Progress and opportunities in backward angle (u-channel) physics

Gayoso, C. Ayerbe; Bibrzycki, Ł.; Diehl, S.; Heppelmann, S.; Higinbotham, D. W.; Huber, G. M.; Kay, S. D.; Klein, S. R.; Laget, J. M.; Li, W. B.; Mathieu, V.; Park, K.; Perry, R. J.; Pire, B.; Semenov-Tian-Shansky, K.; Stanek, A.; Stevens, J. R.; Szymanowski, L.; Weiss, C.; Yu, B. -G.

doi:10.1140/epja/s10050-021-00625-2

Title: Progress and opportunities in backward angle (u-channel) physics

Journal Article · 31 December 2021 · European Physical Journal. A

DOI: https://doi.org/10.1140/epja/s10050-021-00625-2 · OSTI ID:1843181

Gayoso, C. Ayerbe ^[1]; Bibrzycki, Ł. ^[2]; Diehl, S. ^[3]; Heppelmann, S. ^[4]; Higinbotham, D. W. ^[5]; Huber, G. M. ^[6]; Kay, S. D. ^[6]; Klein, S. R. ^[7]; Laget, J. M. ^[5]; Li, W. B. ^[8]; Mathieu, V. ^[9]; Park, K. ^[10]; Perry, R. J. ^[11]; Pire, B. ^[12]; Semenov-Tian-Shansky, K. ^[13]; Stanek, A. ^[7]; Stevens, J. R. ^[14]; Szymanowski, L. ^[15]; Weiss, C. ^[5]; Yu, B. -G. ^[16]

Mississippi State Univ., Starkville, MS (United States)
Pedagogical Univ. of Krakow (Poland)
Justus-Liebig Univ., Giessen (Germany); Univ. of Connecticut, Storrs, CT (United States)
Univ. of California, Davis, CA (United States)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Univ. of Regina, SK (Canada)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
College of William and Mary, Williamsburg, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Univ. Complutense Madrid (Spain); Univ. Autonoma de Barcelona (Spain)
Hampton Univ. Proton Therapy Institute, Hampton, VA (United States)
National Yang Ming Chiao Tung Univ., Hsinchu (Taiwan)
CPHT, CNRS, Ecole polytechnique, Paris (France)
Petersburg Nuclear Physics Institute, Gatchina (Russian Federation); National Research Univ., St. Petersburg (Russian Federation)
College of William and Mary, Williamsburg, VA (United States)
National Centre for Nuclear Research, Warsaw (Poland)
Korean Aerospace Univ., Goyang (Korea, Republic of)

Backward angle (u-channel) scattering provides complementary information for studies of hadron spectroscopy and structure, but has been less comprehensively studied than the corresponding forward angle case. As a result, the physics of u-channel scattering poses a range of new experimental and theoretical opportunities and questions. We summarize recent progress in measuring and understanding high energy reactions with baryon charge exchange in the u-channel, as discussed in the first Backward angle (u-channel) Physics Workshop. In particular, we discuss backward angle measurements and their theoretical description via both hadronic models and the collinear factorization approach, and discuss planned future measurements of u-channel physics. Finally, we propose outstanding questions and challenges for u-channel physics.

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

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

OSTI ID:: 1843181

Report Number(s):: JLAB-PHY--21-3471; DOE/OR/23177-5283; arXiv:2107.06748; 2018/29/B/ST2/02576,2019/33/B/ST2/025881; 824093; NRF-2017R1A2B4010117; SAPIN-2021-00026; 109-2112-M-009-006-MY3,109-2811-M-009-516; PID2019–106080GB-c21,PID2020-118758GB-I00

Journal Information:: European Physical Journal. A, Journal Name: European Physical Journal. A Journal Issue: 12 Vol. 57; ISSN 1434-6001

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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