| | Abstract: Jets originating from bottom (b) quarks, play
an important role in the study of Standard Model processes
together with the search for new physics. In the CMS experiment
a considerable effort is dedicated to the development and the
performance study of so-called b-tagging algorithms. On the
other hand, the top quark which is produced in pair with a high
rate at the LHC, decays near 99% of the time to a b-quark. Hence
it provides a rich source of b-quark jets, suitable for b-jet
identification studies. In this thesis, a fully data-driven
method to measure the b-tagging efficiency, using top quark
events in its semi-electron final state, is developed. The
result of the application of the method on the first LHC
collisions in 2010 is reported. The method can be extended to a
simultaneous top quark cross section and b-tagging efficiency
measurement, therefore resulting in smaller uncertainties.
Time:Wednesday, November 2, 2011, 14:00 | |
