Measurement of the reaction gamma* p --> phi p in deep inelastic e+ p scattering 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:10.1016/0370-2693(96)00603-X

Measurement of the reaction gamma* p --> phi p in deep inelastic e+ p scattering at HERA

ZEUS

Collaboration

Apr, 1996

22 pages

Published in:

Phys.Lett.B 380 (1996) 220-234

e-Print:

hep-ex/9604008 [hep-ex]

DOI:

10.1016/0370-2693(96)00603-X

Report number:

DESY-96-067,
ANL-HEP-PR-96-87

Experiments:

DESY-HERA-ZEUS

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Abstract:

The production of

\phi

mesons in the reaction

e~{+}p \rightarrow e~{+} \phi p

(

\phi \rightarrow K~{+}K~{-}

), for

7 < Q~2 < 25

GeV

~2

and for virtual photon-proton centre of mass energies (

W

) in the range 42-134 GeV, has been studied with the ZEUS detector at HERA. When compared to lower energy data at similar

Q~2

, the results show that the \gamma~*p \rightarrow \phid p cross section rises strongly with

W

. This behaviour is similar to that previously found for the

\gamma~*p \rightarrow \rho~0 p

cross section. This strong dependence cannot be explained by production through soft pomeron exchange. It is, however, consistent with perturbative QCD expectations, where it reflects the rise of the gluon momentum density in the proton at small

x

. The ratio of

\sigma (\phi) / \sigma (\rho~0)

, which has previously been determined by ZEUS to be 0.065

\pm

0.013 (stat.) in photoproduction at a mean

W

of 70 GeV, is measured to be 0.18

\pm

0.05 (stat.)

\pm

0.03 (syst.) at a mean

Q~2

of 12.3 GeV

~2

and mean

W

of

\approx

100 GeV and is thus approaching at large

Q~2

the value of 2/9 predicted from the quark charges of the vector mesons and a flavour independent production mechanism.

Note:

22 pages, including 4 figures Report-no: DESY 96-067

positron p: colliding beams
colliding beams: positron p
positron p: deep inelastic scattering
deep inelastic scattering: positron p
Phi(1020): electroproduction
electroproduction: Phi(1020)
Phi(1020): photoproduction
photoproduction: Phi(1020)
rho(770): photoproduction
photoproduction: rho(770)

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