August 28, 2016 to September 4, 2016
Europe/Athens timezone

CANCELLED Unitary coupled channel approach to diffractive scattering and its application to axial vector states

Aug 29, 2016, 6:00 PM
Amfitrion II (Makedonia Palace)

Amfitrion II

Makedonia Palace

Section B: Light Quarks Section B


Ed Berger (Argonne National Laboratory (US))


Bernhard Ketzer []


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
$\pi N \rightarrow \pi \pi \pi N$ at high energies. This presentation will be based on Phys Rev Letters 114, 192001 (2015) with Jean-Louis Basdevant and more recent research.

Primary author

Ed Berger (Argonne National Laboratory (US))

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