DOI 10.1007/s100520000442
Angular pattern of minijet transverse energy flow
in hadron and nuclear collisions
A.V. Leonidov1,2 - D.M. Ostrovsky1
1 P.N. Lebedev Physics Institute, 117924 Leninsky pr. 53, Moscow, Russia
2 Service de Physique Theorique, C.E. Saclay, 91191 Gif-sur-Yvette, France
Received: 19 January 1999 / Revised version: 18 February 2000 /
Published online: 26 July 2000 - © Springer-Verlag
2000
Abstract
The azimuthal asymmetry of a minijet system produced at the early
stage of
nucleon-nucleon and nuclear collisions in a central rapidity
window
is studied. We show that in pp collisions the minijet transverse
energy
production in a central rapidity window is essentially unbalanced
in the azimuth
due to asymmetric contributions in which only one minijet hits
the
acceptance window. We further study the angular pattern of the
transverse energy
flow generated by the semihard degrees of freedom at the early stage
of high energy
nuclear collisions and its dependence on the number of semihard
collisions in
the models both including and neglecting soft contributions to
the inelastic
cross section at RHIC and LHC energies as well as on the choice
of the infrared
cutoff.
Copyright Società Italiana di Fisica, Springer-Verlag 2000
