Measurement of the Ratio of Branching Fractions B (B[subscript c][superscript +] → J/ψτ[superscript +]ν[superscript τ]) / B (B[subscript c][superscript +] → J/ψμ[superscript +]ν[subscript μ]
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PhysRevLett.120.121801.pdf
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Author(s)
Boettcher, Thomas Julian
Craik, Daniel C
Ilten, Philip J
Weisser, Constantin
Williams, Michael
Date Issued
March 2018
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R., et al. “Measurement of the Ratio of Branching Fractions B (B[subscript c][superscript +] → J/ψτ[superscript +]ν[superscript τ]) / B (B[subscript c][superscript +] → J/ψμ[superscript +]ν[subscript μ].” Physical Review Letters, vol. 120, no. 12, Mar. 2018. © 2018 CERN. for the LHCb
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Final published version
Abstract
A measurement is reported of the ratio of branching fractions R(J/ψ)=B(B[subscript c][superscript +]→J/ψτ[superscript +]ν[subscript τ])/B(B[subscript c][superscript +]→J/ψμ[superscript +]ν[subscript μ]), where the τ[superscript +] lepton is identified in the decay mode τ[superscript +]→μ[superscript +]ν[subscript μ]ν[superscript τ]. This analysis uses a sample of proton-proton collision data corresponding to 3.0 fb[superscript -1] of integrated luminosity recorded with the LHCb experiment at center-of-mass energies of 7 and 8 TeV. A signal is found for the decay B[subscript c][superscript +]→J/ψτ[superscript +]ν[subscript τ] at a significance of 3 standard deviations corrected for systematic uncertainty, and the ratio of the branching fractions is measured to be R(J/ψ)=0.71±0.17(stat)±0.18(syst). This result lies within 2 standard deviations above the range of central values currently predicted by the standard model.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.120.121801
