Speaker
Olga Bessidskaia Bylund
(Stockholm University (SE))
Description
The large integrated luminosity provided by the LHC enables the production significant
numbers of top quark
pairs in association with addition jets or additional gauge bosons.
The production crosssection
of topquark
pairs in association with jets originating from
additional bquarks
is presented. This process is an important background to searches for
new physics and is compared to the available theoretical calculations. In addition, the
production of top quark
pairs in association with W and Z bosons is presented. The
measurement uses events with multiple leptons and in particular probes the coupling
between the top quark and the Z boson. Finally, the crosssection
measurement of
photons produced in association with top quark
pairs is presented. The measurement uses
a data driven technique to extract the signal from the background and achieves a
significance of greater than 5 standard deviations.
Author
Judith Katzy
(DESY, HAMBURG)
