Measurement of elastic omega photoproduction at HERA

Derrick, M.; Krakauer, D.; Magill, S.; Mikunas, D.; Musgrave, B.; Okrasinski, J.R.; Repond, J.; Stanek, R.; Talaga, R.L.; Zhang, H.

doi:10.1007/s002880050297

Measurement of elastic omega photoproduction at HERA

ZEUS

Collaboration

Aug, 1996

25 pages

Published in:

Z.Phys.C 73 (1996) 73-84

e-Print:

hep-ex/9608010 [hep-ex]

DOI:

10.1007/s002880050297

Report number:

DESY-96-159

Experiments:

DESY-HERA-ZEUS

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Abstract:

The reaction

\gamma p \rightarrow \omega p

(\omega \rightarrow \pi~+\pi~-\pi~0

and

\pi~0\rightarrow\gamma\gamma)

has been studied in

ep

interactions using the \mbox{ZEUS} detector at photon-proton centre-of-mass energies between

70

and 90\uni{GeV} and |t| < 0.6\uni{GeV}~2, where

t

is the squared four momentum transferred at the proton vertex. The elastic \ome photoproduction cross section has been measured to be \sigma_{\gamma p\rightarrow \omega p} = 1.21\pm 0.12\pm 0.23 \mu\mbox{b}. The differential cross section

d\sigma_{\gamma p\rightarrow \omega p} /d|t|

has an exponential shape \mbox{e}~{-b |t|} with a slope b = 10.0\pm 1.2\pm 1.3\uni{GeV}~{-2}. The angular distributions of the decay pions are consistent with {\it s}-channel helicity conservation. When compared to low energy data, the features of

\omega

photoproduction as measured at HERA energies are in agreement with those of a soft diffractive process. Previous measurements of the

\rho~0

and

\phi

photoproduction cross sections at HERA show a similar behaviour.

Note:

25 pages including 7 figures Report-no: DESY-96-159

positron p: colliding beams
exchange: one-photon
photon p: exclusive reaction
omega(783): photoproduction
channel cross section
differential cross section: momentum transfer
differential cross section: slope
angular distribution
helicity: conservation law
ZEUS

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Figures(0)

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