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Study Tour Africa-Brazil on Social - Promotion and Protection
Study Tour, Africa-Brazil, Social, Promotion and Protection
New H1 results on isolated leptons and missing pt at HERA
The search for events containing isolated leptons (electrons or muons) and
missing transverse momentum produced in collisions is performed with
the H1 detector at HERA in the period 1994--2005. The analysed data sample
corresponds to an integrated luminosity of 279 pb, which includes 53
pb of data and 107 pb of data from the new
HERA~II phase. A total of 40 events are observed in the data, compared to a
Standard Model (SM) prediction of 34.3 4.8. At large hadronic transverse
momentum 25 GeV, a total of 17 events are observed compared to
9.0 1.5 predicted by the SM. In this region, 15 events are observed in
the data compared to a SM prediction of 4.6 0.8, whereas in the
data 2 events are observed compared to a SM prediction of 4.4
0.7.Comment: 4 pages, 4 figure; To appear in the proceedings of 14th International
Workshop on Deep Inelastic Scattering (DIS 2006), Tsukuba, Japan, 20-24 Apr
200
Review of \u3cem\u3eGalileo and the Church: Political Inquisition or Critical Dialogue?\u3c/em\u3e by Rivka Feldhay
Multi-Lepton and Isolated Lepton Events at HERA
Measurements of the production of events containing isolated high energy
leptons (electrons and muons) produced in ep collisions have been performed
with the H1 and ZEUS detectors at HERA, using data collected in the period
1994-2007. Topologies with more than one charged lepton or with a charged
lepton in coincidence with missing transverse momentum are analysed. The H1 and
ZEUS data, corresponding to an integrated luminosity of about 0.5 fb^-1 per
experiment, are combined in a common phase space. The observed event yields are
compared to the predictions from the Standard Model. In general a good
agreement is found, where the expectation is dominated by photon-photon
collisions for the multi-lepton topologies and by single W production in the
case of events with an isolated electron or muon and missing transverse
momentum. Events with large transverse momentum are observed. Total and
differential cross sections of these processes are measured.Comment: Proceedings of the talk given at The 2009 Europhysics Conference on
High Energy Physics (EPS-HEP 2009), 16-22 July 2009, Krakow, Poland. 4 pages,
3 figures; one style file, one log
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