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Title: Moments of angular distribution and beam asymmetries in ηπ 0 photoproduction at GlueX

Abstract

In the search for exotic mesons, the GlueX collaboration will soon extract moments of the ηπ0 angular distribution. In the perspective of these results, we generalize the formalism of moment extraction to the case in which the two mesons are produced with a linearly polarized beam, and build a model for the reaction ~$$ \overrightarrow{γ} $$ p → ηπ 0 p. The model includes resonant S-, P-, D-waves in ηπ 0, produced by natural exchanges. Moments of the ηπ 0 angular distribution are computed with and without the P-wave, to illustrate the sensitivity to exotic resonances. Although little sensitivity to the P-wave is found in moments of even angular momentum, moments of odd angular momentum are proportional to the interference between the P-wave and the dominant S- and D-waves. We also generalize the definition of the beam asymmetry for two mesons photoproduction and show that, when the meson momenta are perpendicular to the reaction plane, the beam asymmetry enhances the sensitivity to the exotic P-wave.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Complutense Univ. of Madrid, Madrid (Spain); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Org.:
Joint Physics Analysis Center Collaboration
OSTI Identifier:
1562325
Alternate Identifier(s):
OSTI ID: 1562271; OSTI ID: 1567048
Report Number(s):
JLAB-THY-19-2958; DOE/OR/23177-4700; arXiv:1906.04841
Journal ID: ISSN 2470-0010; PRVDAQ; PHY-1415459; FPA2016- 77313-P; FPA2016-75654-C2-2-P;
Grant/Contract Number:  
AC05-06OR23177; FG02-87ER40365; PHY-1415459; IA101819; 251817; A1-S-21389; FPA2016-77313-P; FPA2016-75654-C2-2-P
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 100; Journal Issue: 054017; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Mathieu, Vincent, Albaladejo, Miguel, Fernández-Ramírez, César, Jackura, Andrew, Mikhasenko, Mikhail, Pilloni, Alessandro, and Szczepaniak, Adam. Moments of angular distribution and beam asymmetries in ηπ0 photoproduction at GlueX. United States: N. p., 2019. Web. doi:10.1103/PhysRevD.100.054017.
Mathieu, Vincent, Albaladejo, Miguel, Fernández-Ramírez, César, Jackura, Andrew, Mikhasenko, Mikhail, Pilloni, Alessandro, & Szczepaniak, Adam. Moments of angular distribution and beam asymmetries in ηπ0 photoproduction at GlueX. United States. doi:10.1103/PhysRevD.100.054017.
Mathieu, Vincent, Albaladejo, Miguel, Fernández-Ramírez, César, Jackura, Andrew, Mikhasenko, Mikhail, Pilloni, Alessandro, and Szczepaniak, Adam. Tue . "Moments of angular distribution and beam asymmetries in ηπ0 photoproduction at GlueX". United States. doi:10.1103/PhysRevD.100.054017.
@article{osti_1562325,
title = {Moments of angular distribution and beam asymmetries in ηπ0 photoproduction at GlueX},
author = {Mathieu, Vincent and Albaladejo, Miguel and Fernández-Ramírez, César and Jackura, Andrew and Mikhasenko, Mikhail and Pilloni, Alessandro and Szczepaniak, Adam},
abstractNote = {In the search for exotic mesons, the GlueX collaboration will soon extract moments of the ηπ0 angular distribution. In the perspective of these results, we generalize the formalism of moment extraction to the case in which the two mesons are produced with a linearly polarized beam, and build a model for the reaction ~$ \overrightarrow{γ} $p → ηπ0p. The model includes resonant S-, P-, D-waves in ηπ0, produced by natural exchanges. Moments of the ηπ0 angular distribution are computed with and without the P-wave, to illustrate the sensitivity to exotic resonances. Although little sensitivity to the P-wave is found in moments of even angular momentum, moments of odd angular momentum are proportional to the interference between the P-wave and the dominant S- and D-waves. We also generalize the definition of the beam asymmetry for two mesons photoproduction and show that, when the meson momenta are perpendicular to the reaction plane, the beam asymmetry enhances the sensitivity to the exotic P-wave.},
doi = {10.1103/PhysRevD.100.054017},
journal = {Physical Review D},
number = 054017,
volume = 100,
place = {United States},
year = {2019},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevD.100.054017

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