25-30 September 2011
Sant Feliu de Guixols, Spain
Europe/Madrid timezone

Measurement of the single top quark cross section in 0.70/fb of pp Collisions with the ATLAS detector

Not scheduled
Sant Feliu de Guixols, Spain

Sant Feliu de Guixols, Spain

Speaker

Barbara Alvarez (Michigan State University)

Description

We present studies on the three single top production modes (s, t, Wt channels) carried out with 0.70/fb of integrated luminosity collected by the ATLAS detector during the 2011 LHC run. The t-channel production cross section is measured by two different techniques, a cut-based approach and a multivariate discriminant constructed with a neural network. The cut-based analysis combines 2- and 3-jet events and measures sigma_t = 90 +32 -22 pb. The search for Wt events in the dilepton channel results in a 95% CL upper limit on Wt-channel single top-quark production of sigma < 39 pb. Finally, for the single top channel with the lowest expected production cross section, the s-channel, an upper limit at 95% CL of sigma_s< 26.5 pb is obtained using a cut-based approach.

Primary author

Barbara Alvarez (Michigan State University)

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