Oxford LHCb and CLEO-c

Denys Wilkinson Building Keble Road Oxford OX1 3RH

Calibration of RICH System and Particle Identification

Oxford physicists are responsible for providing the tools to be allow the RICH system and hadron identification performance to be calibrated directly from the data.

The calibration relies on the events accumulated by the D* trigger stream. This selects the decay chain:

using vertex and invariant mass information alone, and hence a sample of kaons and pions which is unbiased by the RICH and so suitable for calibration studies. Offline the selection cuts are tightened to achieve a purity in the region of 95%. About 10⁷ such events are expected per 2 fb^-1.

Below is shown the kaon identification efficiency from the RICH as a function of momentum for tracks selected in this manner, compared with tracks flagged as kaons through their Monte Carlo truth information. The good agreement between the two curves shows the reliability of the method.

 

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