DOI 10.1007/s100520000352
Total hadronic cross-section
of
photon-photon interactions at LEP
The OPAL Collaboration
G.Abbiendi
- et al.
Dipartimento di Fisica dell' Università di Bologna and INFN,
40126 Bologna, Italy
Received: 3 June 1999 / Published online: 6 April 2000 - © Springer-Verlag 2000
Abstract
The total hadronic cross-section
for
the interaction of real photons,
,
is measured for
centre-of-mass energies
GeV.
The cross-section is extracted from a measurement of the
process
,
using a luminosity function for the photon flux together with form factors
for extrapolating to real photons (Q2=0 GeV2).
The data were taken with the OPAL detector at LEP at
centre-of-mass energies
and 183 GeV.
The cross-section
is compared
with Regge factorisation and with the energy dependence
observed in
p and pp
interactions.
The data are also compared to models which predict
a faster rise of
compared to
p and pp
interactions due to additional hard
interactions not present in hadronic collisions.
Copyright Società Italiana di Fisica, Springer-Verlag 2000