OBSERVATION OF THE BEAM-SIZE EFFECT AT HERA

Authors
PIOTRZKOWSKI K
Citation
K. Piotrzkowski, OBSERVATION OF THE BEAM-SIZE EFFECT AT HERA, Zeitschrift fur Physik. C, Particles and fields, 67(4), 1995, pp. 577-583
Citations number
19
Categorie Soggetti
Physics, Particles & Fields
Journal title
Zeitschrift fur Physik. C, Particles and fields → ACNP
ISSN journal
01709739
Volume
67
Issue
4
Year of publication
1995
Pages
577 - 583
Database
ISI
SICI code
0170-9739(1995)67:4<577:OOTBEA>2.0.ZU;2-K
Abstract
A precise measurement of the spectrum of the photons from ep bremsstra hlung with the ZEUS luminosity monitor at HERA is reported. The measur ement shows a reduced rate compared to the Bethe-Heitler spectrum for photon energies below 5 GeV. This suppression, called the beam-size ef fect, is explained by the finite transverse size of the beam overlap r elative to the typical impact parameter in the process of ep bremsstra hlung at HERA energies.