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Title: Peak Locations and Relative Phase of Different Decay Modes of the a 1 Axial Vector Resonance in Diffractive Production

Abstract

We show that a single I = 1 spin-parity J(PC) = 1(++) a(1) resonance can manifest itself as two separated mass peaks, one decaying into an S-wave rho pi system and the second decaying into a P-wave f(0)(980)pi system, with a rapid increase of the phase difference between their amplitudes arising mainly from the structure of the diffractive production process. This study clarifies questions related to the mass, width, and decay rates of the a(1) resonance raised by the recent high statistics data of the COMPASS Collaboration on a 1 production in pi N -> pi pi pi N at high energies.

Authors:
;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of High Energy Physics
OSTI Identifier:
1391734
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 114; Journal Issue: 19; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Basdevant, Jean-Louis, and Berger, Edmond L. Peak Locations and Relative Phase of Different Decay Modes of the a1 Axial Vector Resonance in Diffractive Production. United States: N. p., 2015. Web. doi:10.1103/PhysRevLett.114.192001.
Basdevant, Jean-Louis, & Berger, Edmond L. Peak Locations and Relative Phase of Different Decay Modes of the a1 Axial Vector Resonance in Diffractive Production. United States. doi:10.1103/PhysRevLett.114.192001.
Basdevant, Jean-Louis, and Berger, Edmond L. Fri . "Peak Locations and Relative Phase of Different Decay Modes of the a1 Axial Vector Resonance in Diffractive Production". United States. doi:10.1103/PhysRevLett.114.192001.
@article{osti_1391734,
title = {Peak Locations and Relative Phase of Different Decay Modes of the a1 Axial Vector Resonance in Diffractive Production},
author = {Basdevant, Jean-Louis and Berger, Edmond L.},
abstractNote = {We show that a single I = 1 spin-parity J(PC) = 1(++) a(1) resonance can manifest itself as two separated mass peaks, one decaying into an S-wave rho pi system and the second decaying into a P-wave f(0)(980)pi system, with a rapid increase of the phase difference between their amplitudes arising mainly from the structure of the diffractive production process. This study clarifies questions related to the mass, width, and decay rates of the a(1) resonance raised by the recent high statistics data of the COMPASS Collaboration on a 1 production in pi N -> pi pi pi N at high energies.},
doi = {10.1103/PhysRevLett.114.192001},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 19,
volume = 114,
place = {United States},
year = {2015},
month = {5}
}

Works referenced in this record:

Review of Particle Physics
journal, August 2014


Unitary coupled-channel analysis of diffractive production of the A 1 resonance
journal, August 1977


Kinematical Interpretation of the First π p Resonance
journal, August 1964


Theory of the Low-Energy Pion-Pion Interaction
journal, July 1960


On the apparent shift of the rho meson mass in photoproduction
journal, January 1966


Unstable-particle scattering and an analytic quasi-unitary isobar model
journal, January 1979