Search for Odderon induced contributions to exclusive Meson Photoproduction at HERA

Details Search for Odderon induced contributions to exclusive Meson Photoproduction at HERA Search for Odderon induced contributions to exclusive Meson Photoproduction at HERA

2001-12-07

arxiv.org/abs/hep-ex/0112012v1

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages, 7 figures (requires amssymb and epsfig); Talk presented in the Intern. Conference on New Trends in High Energy Physic

Scientific paper

Odderon induced contributions to exclusive photoproduction of $\pi^{\circ}$, $f_2(1270)$ and $a_2(1320)$ 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 $Q^2 < 0.01 $GeV$^2$ and $0.02 $GeV$^2 < |t| < 0.3 $GeV$^2$, where t is the squared momentum transfer at the proton vertex. The measured upper limits for the cross sections, $\sigma(\gamma p\to^{\hspace*{-2ex}\mathbb{O}}\pi^{\circ}N^{\ast}) < 39$ nb, $\sigma(\gamma p\to^{\hspace*{-2ex}\mathbb{O}} f_2(1270)X) < 16$ nb and $\sigma(\gamma p\to^{\hspace*{-2ex}\mathbb{O}} a_2(1320)X) < 96$ nb, all at 95% CL, are lower than the predictions by a theoretical model. Exclusive photoproduction of $\omega$ and $\omega\pi^{\circ}$, in the $3\gamma$ and $5\gamma$ decay modes, is observed with the expected cross sections.

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