Search for odderon induced contributions to exclusive pi0 photoproduction at HERA

Adloff, C.; Andreev, V.; Andrieu, B.; Anthonis, T.; Arkadov, V.; Astvatsatourov, A.; Babaev, A.; Bahr, J.; Baranov, P.; Barrelet, E.

doi:10.1016/S0370-2693(02)02479-6

Search for odderon induced contributions to exclusive pi0 photoproduction at HERA

H1

Collaboration

Jun, 2002

14 pages

Published in:

Phys.Lett.B 544 (2002) 35-43

e-Print:

hep-ex/0206073 [hep-ex]

DOI:

10.1016/S0370-2693(02)02479-6

Report number:

DESY-02-087

Experiments:

DESY-HERA-H1

View in:

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Abstract: (Elsevier)

A search for contributions to the reaction ep→eπ 0 N ∗ from photon–odderon fusion in the photoproduction regime at HERA is reported, at an average photon–proton centre-of-mass energy 〈 W 〉=215 GeV. The measurement proceeds via detection of the π 0 decay photons, a leading neutron from the N ∗ decay, and the scattered electron. No π 0 signal is observed and an upper limit on the cross section for the photon–odderon fusion process of σ(γp→π 0 N ∗ )<49 nb at the 95% confidence level is derived, integrated over the experimentally accessible range of the squared four-momentum transfer at the nucleon vertex 0.02<| t |<0.3 GeV 2 . This excludes a recent prediction from a calculation based on a non-perturbative QCD model of a photon–odderon fusion cross section above 200 nb.

Note:

13 pages, 1 table and 4 figures Report-no: DESY 02-087

positron p: colliding beams
electron p: colliding beams
photon p: exclusive reaction
pi0: photoproduction
pi0: radiative decay
nucleon resonance: photoproduction
nucleon resonance: hadronic decay
final state: (n electron 2photon)
odderon: exchange
channel cross section: upper limit

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