S. Chekanov et al., Study of the effective transverse momentum of partons in the proton using prompt photons in photoproduction at HERA, PHYS LETT B, 511(1), 2001, pp. 19-32
The photoproduction of prompt photons, together with an accompanying jet, h
as been measured with the ZEUS detector at HERA using an integrated luminos
ity of 38.6 pb(-1). A study of the effective transverse momentum. (k(T)), o
f partons in the proton, as modelled within the framework of the PYTHIA Mon
te Carlo. gives a value of (k(T)) = 1.69 +/- 0.18(-0.20)(+0.18) GeV for the
gammap centre-of-mass energy range 134 < W < 251 GeV. This result is in ag
reement with the previously observed trend in hadron-hadron scattering for
(k(T)) to rise with interaction energy. (C) 2001 Elsevier Science B.V. All
rights reserved.