$$\pi ^-p\rightarrow \eta ^{(\prime )}\, \pi ^- p$$ in the double-Regge region: Joint Physics Analysis Center

Bibrzycki, Ł.; Fernández-Ramírez, C.; Mathieu, V.; Mikhasenko, M.; Albaladejo, M.; Hiller Blin, A. N.; Pilloni, A.; Szczepaniak, A. P.

doi:10.1140/epjc/s10052-021-09420-1

$$$$\pi ^-p\rightarrow \eta ^{(\prime )}\, \pi ^- p$$$$ in the double-Regge region: Joint Physics Analysis Center

Journal Article · Fri Jul 23 00:00:00 EDT 2021 · European Physical Journal. C, Particles and Fields

DOI:https://doi.org/10.1140/epjc/s10052-021-09420-1· OSTI ID:1809873

Bibrzycki, Ł.; ; Mathieu, V.; Mikhasenko, M.; Albaladejo, M.; Hiller Blin, A. N.; Pilloni, A.; Szczepaniak, A. P.

Abstract

The production of $$$$\eta ^{(\prime )}\pi $$$$ $η^{(')} π$ pairs constitutes one of the golden channels to search for hybrid exotics, with explicit gluonic degrees of freedom. Understanding the dynamics and backgrounds associated to $$$$\eta ^{(\prime )}\pi $$$$ $η^{(')} π$ production above the resonance region is required to impose additional constraints to the resonance extraction. We consider the reaction $$$$\pi ^-p\rightarrow \eta ^{(\prime )} \pi ^- \,p$$$$ $π^{-} p \to η^{(')} π^{-} p$ measured by COMPASS. We show that the data in $$$$2.4< m_{\eta ^{(\prime )}\pi } < 3.0{\mathrm {\,GeV}} $$$$ $2.4 < m_{η^{(')} π} < 3.0 GeV$ can be described by amplitudes based on double-Regge exchanges. The angular distribution of the meson pairs, in particular in the $$$$\eta ' \pi $$$$ $η^{'} π$ channel, can be attributed to flavor singlet exchanges, suggesting the presence of a large gluon content that couples strongly to the produced mesons.

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

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

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

OSTI ID:: 1809873

Alternate ID(s):: OSTI ID: 1824282
OSTI ID: 23086167

Report Number(s):: DOE/OR--23177-5172; JLAB-THY--21-3354; arXiv:2104.10646; 647; PII: 9420

Journal Information:: European Physical Journal. C, Particles and Fields, Journal Name: European Physical Journal. C, Particles and Fields Journal Issue: 7 Vol. 81; ISSN 1434-6044

Publisher:: Springer Science + Business MediaCopyright Statement

Country of Publication:: Germany

Language:: English

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