VERY HIGH Q(2) PHYSICS AT HERA

Authors
Citation
F. Zetsche, VERY HIGH Q(2) PHYSICS AT HERA, Nuclear physics. B, Proceedings supplement, 71, 1999, pp. 21-30
Citations number
20
Categorie Soggetti
Physics, Particles & Fields
ISSN journal
09205632
Volume
71
Year of publication
1999
Pages
21 - 30
Database
ISI
SICI code
0920-5632(1999)71:<21:VHQPAH>2.0.ZU;2-Z
Abstract
Recent measurements from the H1 and ZEUS experiments at HERA in deep-i nelastic ep scattering at very high values of the squared 4-momentum t ransfer Q(2) are discussed and compared to predictions of the Standard Model. Both experiments observe a large excess of events in neutral c urrent (NC) scattering, ep --> eX, at values of Q(2) > 15000 GeV2 and a small excess of events in charged current (CC) scattering, ep --> nu X. The probability that the observed event rates correspond to a stat istical fluctuation compatible with the Standard Model cross sections is about 1% for NC reactions. This observation has driven speculations about possible physics beyond the Standard Model.