Moments of angular distribution and beam asymmetries in 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 → 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.
- 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)
- 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; 054017
- 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 Name: Physical Review D Journal Volume: 100 Journal Issue: 5; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS
Citation Formats
Mathieu, V., Albaladejo, M., Fernández-Ramírez, C., Jackura, A. W., Mikhasenko, M., Pilloni, A., Szczepaniak, A. P., and Joint Physics Analysis Center Collaboration. Moments of angular distribution and beam asymmetries in η π 0 photoproduction at GlueX. United States: N. p., 2019.
Web. doi:10.1103/PhysRevD.100.054017.
Mathieu, V., Albaladejo, M., Fernández-Ramírez, C., Jackura, A. W., Mikhasenko, M., Pilloni, A., Szczepaniak, A. P., & Joint Physics Analysis Center Collaboration. Moments of angular distribution and beam asymmetries in η π 0 photoproduction at GlueX. United States. https://doi.org/10.1103/PhysRevD.100.054017
Mathieu, V., Albaladejo, M., Fernández-Ramírez, C., Jackura, A. W., Mikhasenko, M., Pilloni, A., Szczepaniak, A. P., and Joint Physics Analysis Center Collaboration. Tue .
"Moments of angular distribution and beam asymmetries in η π 0 photoproduction at GlueX". United States. https://doi.org/10.1103/PhysRevD.100.054017.
@article{osti_1562325,
title = {Moments of angular distribution and beam asymmetries in η π 0 photoproduction at GlueX},
author = {Mathieu, V. and Albaladejo, M. and Fernández-Ramírez, C. and Jackura, A. W. and Mikhasenko, M. and Pilloni, A. and Szczepaniak, A. P. and Joint Physics Analysis Center Collaboration},
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 = 5,
volume = 100,
place = {United States},
year = {Tue Sep 17 00:00:00 EDT 2019},
month = {Tue Sep 17 00:00:00 EDT 2019}
}
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https://doi.org/10.1103/PhysRevD.100.054017
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