Opposite-side flavour tagging of B mesons at the LHCb experiment

Eur Phys J C Part Fields. 2012;72(6):2022. doi: 10.1140/epjc/s10052-012-2022-1. Epub 2012 Jun 7.

Abstract

The calibration and performance of the opposite-side flavour tagging algorithms used for the measurements of time-dependent asymmetries at the LHCb experiment are described. The algorithms have been developed using simulated events and optimized and calibrated with B+J/ψK+, B0J/ψK∗0 and B0D∗-μ+νμ decay modes with 0.37 fb-1 of data collected in pp collisions at [Formula: see text] during the 2011 physics run. The opposite-side tagging power is determined in the B+J/ψK+ channel to be (2.10±0.08±0.24) %, where the first uncertainty is statistical and the second is systematic.