Eur. Phys. J. A (2008) 38: 155-158
https://doi.org/10.1140/epja/i2008-10620-8

Regular Article - Experimental Physics

Exclusive ωπ⁰ production with muons^⋆

Universität München, D-85748, Garching, Germany

^* e-mail: Massimo.Bettinelli@physik.uni-muenchen.de

Received: 7 April 2008
Revised: 19 June 2008
Published online: 18 July 2008

Abstract

Using 160GeV muon scattering data collected with the COMPASS experiment at CERN, the exclusive production of ωπ⁰ via virtual photons was studied. Selective population of a peak around 1250MeV is observed. Possible contributions from spin-parity 1^- are searched for, inspecting decay angular correlations. In particular, the orientation of the ω decay plane may allow a distinction from the 1⁺ b ₁(1235) state. Our observation is compared with indications of a (1250) in annihilation and in γp .