Measurement of diffractive photoproduction of vector mesons at large momentum transfer at HERA - INSPIRE

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Measurement of diffractive photoproduction of vector mesons at large momentum transfer at HERA

ZEUS

Collaboration

Oct, 1999

53 pages

Published in:

Eur.Phys.J.C 14 (2000) 213-238

e-Print:

hep-ex/9910038 [hep-ex]

DOI:

10.1007/s100520000374

Report number:

DESY-99-160,
ANL-HEP-PR-99-119

Experiments:

DESY-HERA-ZEUS

View in:

ADS Abstract Service

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Abstract:

Elastic and proton-dissociative photoproduction of

\rho^0

,

\phi

and

J/\psi

vector mesons (

\gamma p\to Vp

,

\gamma p\to VN

, respectively) have been measured in e^+p interactions at HERA up to -t=3 GeV

^2

, where t is the four-momentum transfer squared at the photon-vector meson vertex. The analysis is based on a data sample in which photoproduction reactions were tagged by detection of the scattered positron in a special-purpose calorimeter. This limits the photon virtuality, Q^2, to values less than 0.01 GeV

^2

, and selects a

\gamma p

average center-of-mass energy of = 94 GeV. Results for the differential cross sections, d

\sigma

/d

t

, for

\rho^0

,

\phi

and

J/\psi

mesons are presented and compared to the results of recent QCD calculations. Results are also presented for the t-dependence of the pion-pair invariant-mass distribution in the

\rho^0

mass region and of the spin-density matrix elements determined from the decay-angle distributions. The Pomeron trajectory has been derived from measurements of the W dependence of the elastic differential cross sections d

\sigma

/d

t

for both

\rho^0

and

\phi

mesons.

Note:

52 pages, including 24 figures and 18 tables Report-no: DESY 99-160

positron p: colliding beams
photon p: exclusive reaction
vector meson: photoproduction
diffraction: dissociation
rho(770)0
Phi(1020)
J/psi(3100)
vector meson: hadronic decay
angular distribution
differential cross section: momentum transfer

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