A new algorithm for identifying the flavour of B 0 s mesons at LHCb
Name
Aaij_2016_J._Inst._11_P05010.pdf
Description
Published version
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1010.07 KB
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Unknown
Checksum (MD5)
9e6d70cb70c82fd257c422acafe74051
Author(s)
The LHCb Collaboration
Ilten, Philip J
Williams, Michael
Date Issued
2016
Journal
Journal of Instrumentation
Publisher
IOP Publishing
Version
Final published version
Abstract
© CERN 2016 for the benefit of the LHCb collaboration. A new algorithm for the determination of the initial flavour of B0s mesons is presented. The algorithm is based on two neural networks and exploits the b hadron production mechanism at a hadron collider. The first network is trained to select charged kaons produced in association with the B0 s meson. The second network combines the kaon charges to assign the B0 s flavour and estimates the probability of a wrong assignment. The algorithm is calibrated using data corresponding to an integrated luminosity of 3 fb-1 collected by the LHCb experiment in protonproton collisions at 7 and 8 TeV centre-of-mass energies. The calibration is performed in two ways: by resolving the B0sB0s flavour oscillations in B0s →D-s φ+ decays, and by analysing flavour-specific B∗ s2 (5840)0→ B+K- decays. The tagging power measured in B0s → D-s φ+ decays is found to be (1:80 ± 0:19 (stat) ± 0:18 (syst))%, which is an improvement of about 50% compared to a similar algorithm previously used in the LHCb experiment.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Creative Commons Attribution 3.0 unported license
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DOI of Published Version
https://doi.org/10.1088/1748-0221/11/05/P05010
