This thesis is dedicated to the study of radiative decays of B mesons at LHCb.
At quark level, such decays are a b-sy
transition and take place via a penguin loop
and are sensitive to virtual contribution of New Physics, which can be indicated by
an increase in the decay rates. These decays also offer the possibility to test the V-A
structure of the Standard Model coupling in the processes mediated by loop penguin
diagrams.
In the decay Bs-ǿy, New Physics contribution can be probed by measuring
the polarization of the photon in this decay. Systematic effects in the proper time
reconstruction of the Bs in Bs-ǿy can bias the photon polarization measurement
in this decay, which will reduce the sensitivity on the relevant New Physics parameter.
The author studied those effects and developed ideas to calibrate them using
Bd-K *y and Bs-J/ψǿ decays as control channels. These studies are mostly
Monte Carlo based, due to a relatively small data set from the 2010 running. However,
some studies and cross checks have indeed been performed with data.
The author developed the trigger and stripping (another level of skimming the
data, after the trigger) selections for Bs-ǿy and Bd-K*y
decays, and made a
major contribution to the selection of the first significant sample of Bd-K *y from
the 2010 data set of LHCb.