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Measurement of the mass and lifetime of the Ωb- baryon

MPS-Authors
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Aquines Gutierrez,  O.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Blouw,  Johan
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Britsch,  Markward
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Fontana,  Marianna
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Popov,  Dmitry
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Schmelling,  Michael
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Zavertyaev,  Mikhail
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Citation

LHCb Collaboration, Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Affolder, A., et al. (2016). Measurement of the mass and lifetime of the Ωb- baryon. Physical Review D, 93(09): 092007. doi:10.1103/PhysRevD.93.092007.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002B-27CA-E
Abstract
A new algorithm for the determination of the initial flavour of $B_s^0$
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 $B_s^0$ meson.
The second network combines the kaon charges to assign the $B_s^0$ 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 proton-proton collisions at 7 and 8 TeV
centre-of-mass energies. The calibration is performed in two ways: by resolving
the $B_s^0$-$\bar{B}_s^0$ flavour oscillations in $B_s^0 \to D_s^- \pi^+$
decays, and by analysing flavour-specific $B_{s 2}^{*}(5840)^0 \to B^+ K^-$
decays. The tagging power measured in $B_s^0 \to D_s^- \pi^+$ decays is found
to be $(1.80 \pm 0.19({\rm stat}) \pm 0.18({\rm syst}))$\%, which is an
improvement of about 50\% compared to a similar algorithm previously used in
the LHCb experiment.