Measurement of the cross-section for the reaction $\gamma p \to J/\psi p$ with the ZEUS detector at HERA

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

doi:10.1016/0370-2693(95)00403-8

Measurement of the cross-section for the reaction $\gamma p \to J/\psi p$ with the ZEUS detector at HERA

ZEUS

Collaboration

Mar, 1995

16 pages

Published in:

Phys.Lett.B 350 (1995) 120-134

e-Print:

hep-ex/9503015 [hep-ex]

DOI:

10.1016/0370-2693(95)00403-8

Report number:

DESY-95-052,
ANL-HEP-PR-95-52

Experiments:

DESY-HERA-ZEUS

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Abstract:

This paper reports the cross section measurements for the process ep

\rightarrow

e\jpsip for

Q~2 < 4

GeV

~2

at

\sqrt s = 296

GeV, based on an integrated luminosity of about 0.5pb

~{-1}

, using the ZEUS detector. The \jpsiwas detected in its

\rm e~{+}e~{-}

and

\rm \mu~{+}\mu~{-}

decay modes. The photoproduction cross section was measured to be

52~{ \ +7}_{-12}\pm 10

nb at an average

\gamma

p centre of mass energy of 67 GeV and

71~{+13}_{-20}\pm 12

nb at 114 GeV. The significant rise of the cross section compared to lower energy measurements is not in agreement with VDM models, but can be described by QCD inspired models if a rise in the gluon momentum density at low

x

in the proton is assumed.

Note:

21 pages, latex, 4 figures appended as uuencoded file Report-no: DESY 95-052

electron p: colliding beams
colliding beams: electron p
electron p: exclusive reaction
differential cross section: transverse momentum
transverse momentum: differential cross section
channel cross section: energy dependence
gluon: momentum spectrum
ZEUS
experimental results
DESY DESY HERA Stor Stor

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Measurement of the cross-section for the reaction γp→J/ψp\gamma p \to J/\psi pγp→J/ψp with the ZEUS detector at HERA

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Measurement of the cross-section for the reaction $\gamma p \to J/\psi p$ with the ZEUS detector at HERA