Orateur
Alberto Orso Maria Iorio
(stituto Nazionale di Fisica Nucleare (INFN))
Description
We present a measurement of the inclusive single top production cross
section in proton-proton collisions at the LHC at a centre-of-mass
energy of 7 TeV, using data collected with the CMS experiment during
the year 2011. The analysis considers decay channels where the W from
the top decays into electron-neutrino or muon-neutrino, and makes
use of kinematic characteristics of electroweak single top production
for the separation of signal from backgrounds using multivariate
methods. The result, which supersedes an earlier measurement based
on 2010 data, is compared with the most precise standard model
theory predictions. We also present measurements of various
differential single top quark production cross sections.
In addition, we present the first measurement of single top quark
production in the tW-channel in pp collisions, in which a top quark
is produced in association with a W boson. The experimental signature
is similar to top pair production, and there is interference at higher
orders between the two processes. The measurement is performed using
final states in which the associated W boson as well as the one
originating from the top quark decay leptonically. Multivariate
methods are used to extract the cross section. The result is compared
with current standard model theory predictions.
Auteurs principaux
Alberto Orso Maria Iorio
(stituto Nazionale di Fisica Nucleare (INFN))
Dr
Manfred KRAMMER
(HEPHY)
