Opposite-side flavour tagging of B mesons at the LHCb experiment
LHCb Collaboration: R. Aaij, C. Abellan Beteta, B. Adeva, M. Adinolfi,, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander,, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves Jr, S. Amato, Y. Amhis, J., Anderson, R. B. Appleby, O. Aquines Gutierrez
TL;DR
This paper details the calibration and performance evaluation of opposite-side flavour tagging algorithms at LHCb, crucial for measuring time-dependent asymmetries in B meson decays, using simulated and real collision data.
Contribution
It introduces optimized flavour tagging algorithms calibrated with specific B decay modes using LHCb data from 2011, enhancing measurement precision.
Findings
Tagging power in B+ -> J/psi K+ channel is 2.10%
Algorithms developed with simulated events and calibrated with real data
Performance characterized with statistical and systematic uncertainties
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/psi K+, B0 -> J/psi K*0 and B0 -> D*- mu+ nu_mu decay modes with 0.37 fb^-1 of data collected in pp collisions at sqrt(s) = 7 TeV during the 2011 physics run. The opposite-side tagging power is determined in the B+ -> J/psi K+ channel to be (2.10 +- 0.08 +- 0.24) %, where the first uncertainty is statistical and the second is systematic.
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