2001/12/07 by Jan Olsson, Olsson, J. · 1 citation
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.hep-ex/0112012
openalex publication_date 2001/12/07 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28
Odderon induced contributions to exclusive photoproduction of π∘, f2(1270) and a2(1320) have been searched for at HERA, using the multiphoton decays of these mesons. No indication for such contributions was found, in a kinematic region defined by the average photon-proton centre-of-mass energy = 200 - 215 GeV, photon virtualities Q2 < 0.01 GeV2 and 0.02 GeV2 < |t| < 0.3 GeV2, where t is the squared momentum transfer at the proton vertex. The measured upper limits for the cross sections, σ(γp→^\hspace*-2ex\mathbbOπ∘N∗) < 39 nb, σ(γp→^\hspace*-2ex\mathbbO f2(1270)X) < 16 nb and σ(γp→^\hspace*-2ex\mathbbO a2(1320)X) < 96 nb, all at 95% CL, are lower than the predictions by a theoretical model. Exclusive photoproduction of ω and ωπ∘, in the 3γ and 5γ decay modes, is observed with the expected cross sections.