Peak Locations and Relative Phase of Different Decay Modes of the a1 Axial Vector Resonance in Diffractive Production

Jean-Louis Basdevant and Edmond L. Berger
Phys. Rev. Lett. 114, 192001 – Published 12 May 2015

Abstract

We show that a single I=1 spin-parity JPC=1++ a1 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 f0(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 a1 resonance raised by the recent high statistics data of the COMPASS Collaboration on a1 production in πNπππN at high energies.

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  • Received 14 February 2015

DOI:https://doi.org/10.1103/PhysRevLett.114.192001

© 2015 American Physical Society

Authors & Affiliations

Jean-Louis Basdevant*

  • Physics Department, Ecole Polytechnique, 91128 Palaiseau, France

Edmond L. Berger

  • High Energy Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA

  • *jean-louis.basdevant@polytechnique.edu
  • berger@anl.gov

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Vol. 114, Iss. 19 — 15 May 2015

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