LHCb: Flavour tagging, including calibration and control

Speaker: Hugo Ruiz (Universitat de Barcelona)

 

Abstract:

In the first part of the presentation, the different tagging algorithms that have been 
designed for the LHCb experiment will be described, as well as the procedure for the 
combination of several tags present in a single event. The expected performance from the 
algorithms based on MC studies will then be shown.

The second part of the presentation will describe the calibration of the tagging procedure:
 it will be demonstrated that MC simulation is not capable of providing the precision 
needed on the mistag probability for the precise measurements expected in LHCb. It will 
then be explained how LHCb plans to obtain the calibration from data, by the use of control 
channels. It will be shown how to overcome the sizeable differences on mistag probability 
between control and signal channels, caused by different offline and trigger selections, 
which presents the main difficulty to the method.