Peak locations and relative phase of different decay modes of the $a_1$ axial vector resonance in diffractive production

Jean-Louis Basdevant; Edmond L Berger

doi:10.1103/PhysRevLett.114.192001

paper

Peak locations and relative phase of different decay modes of the $a_{1}$ axial vector resonance in diffractive production

arXiv:1504.05955 · doi:10.1103/PhysRevLett.114.192001

Abstract

We show that a single $I = 1$ spin-parity $J^{P C} = 1^{++}$ $a_{1}$ resonance can manifest itself as two separated mass peaks, one decaying into an S-wave $ρ π$ 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 $π N \to π π π N$ at high energies.

4 pages, 4 figures, to be published in Physical Review Letters. arXiv admin note: substantial text overlap with arXiv:1501.04643

Peak locations and relative phase of different decay modes of the a1​ axial vector resonance in diffractive production

Abstract

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Peak locations and relative phase of different decay modes of the $a_{1}$ axial vector resonance in diffractive production