Measurement of the lifetime of the B[superscript +][subscript c] meson using the B[superscript +][subscript c] → [J over ψπ[superscript +]] decay mode
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Collaboration-2015-Measurement of the l.pdf
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Author(s)
Counts, Ian Thomas Hunt
Ilten, Philip J
Williams, Michael
Date Issued
January 2015
Journal
Physics Letters B
Publisher
Elsevier
Citation
“Measurement of the Lifetime of the B[superscript +][subscript c] meson using the B[superscript +][subscript c] → [J over ψπ[superscript +]] Decay Mode.” Physics Letters B 742 (March 2015): 29–37.
Version
Final published version
Abstract
The difference in total widths between the B[superscript +][subscript c] and B[superscript +] mesons is measured using a data sample corresponding to an integrated luminosity of 3.0 fb[superscript −1] collected by the LHCb experiment in 7 and 8 TeV centre-of-mass energy proton–proton collisions at the LHC. Through the study of the time evolution of B[superscript +][subscript c] → [J over ψπ[superscript +]] and B[superscript +] → [J over ψK[superscript +]] decays, the width difference is measured to be
ΔΓ ≡ Γ[subscript B[superscript +][subscript c]] - Γ[subscript B[superscript +]] = 4.46 ± 0.14 ± 0.07 mm[superscript −1] c,
where the first uncertainty is statistical and the second systematic. The known lifetime of the B[superscript +] meson is used to convert this to a precise measurement of the B[superscript +][subscript c] lifetime,
τ[subscript B[superscript +][subscript c]] = 513.4 ± 11.0 ± 5.7 fs,
where the first uncertainty is statistical and the second is systematic.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.1016/j.physletb.2015.01.010
