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Basdevant JL, Berger EL. Peak Locations and Relative Phase of Different Decay Modes of the a_{1} Axial Vector Resonance in Diffractive Production. Phys Rev Lett. 2015;114(19):192001doi: 10.1103/PhysRevLett.114.192001.
Basdevant, J. L., & Berger, E. L. (2015). Peak Locations and Relative Phase of Different Decay Modes of the a_{1} Axial Vector Resonance in Diffractive Production. Physical review letters, 114(19), 192001. https://doi.org/10.1103/PhysRevLett.114.192001
Basdevant, Jean-Louis, and Berger, Edmond L. "Peak Locations and Relative Phase of Different Decay Modes of the a_{1} Axial Vector Resonance in Diffractive Production." Physical review letters vol. 114,19 (2015): 192001. doi: https://doi.org/10.1103/PhysRevLett.114.192001
Basdevant JL, Berger EL. Peak Locations and Relative Phase of Different Decay Modes of the a_{1} Axial Vector Resonance in Diffractive Production. Phys Rev Lett. 2015 May 15;114(19):192001. doi: 10.1103/PhysRevLett.114.192001. Epub 2015 May 12. PMID: 26024163.
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Phys Rev Lett. 2015 May 15;114(19):192001. doi: 10.1103/PhysRevLett.114.192001. Epub 2015 May 12.

Peak Locations and Relative Phase of Different Decay Modes of the a_{1} Axial Vector Resonance in Diffractive Production.

Physical review letters

Jean-Louis Basdevant, Edmond L Berger

Affiliations

  1. Physics Department, Ecole Polytechnique, 91128 Palaiseau, France.
  2. High Energy Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.

PMID: 26024163 DOI: 10.1103/PhysRevLett.114.192001

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 ρπ system and the second decaying into a P-wave f_{0}(980)π 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 πN→πππN at high energies.

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