This is not the latest version of this item. The latest version can be found here.
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
Size
1010.07 KB
Format
Adobe PDF
Checksum (MD5)
9e6d70cb70c82fd257c422acafe74051
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.
Terms of Use
Creative Commons Attribution 3.0 unported license
Persistent DSpace Link
DOI of Published Version
10.1088/1748-0221/11/05/P05010
