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Report number arXiv:1506.08614 ; CERN-PH-EP-2015-150 ; LHCB-PAPER-2015-025 ; CERN-PH-EP-2015-150 ; LHCb-PAPER-2015-025 ; LHCB-PAPER-2015-025 ; CERN-PH-EP-2015-150
Title Measurement of the ratio of branching fractions B(B¯0D+τν¯τ)/B(B¯0D+μν¯μ)
Author(s) LHCb Collaboration  Show all 726 authors
Publication 2015-09-09
Imprint 29 Jun 2015
Number of pages 10
Note 17 pages, 1 figure. v2 after referees' comments
In: Phys. Rev. Lett. 115 (2015) pp.111803
Phys. Rev. Lett. 115 (2015) pp.159901
DOI 10.1103/PhysRevLett.115.111803
10.1103/PhysRevLett.115.159901 (Publisher’s Note)
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; LHCb
Free keywords flavor physics ; B physics ; experimental results
Abstract The branching fraction ratio R(D)B(B¯0D+τν¯τ)/B(B¯0D+μν¯μ) is measured using a sample of proton-proton collision data corresponding to 3.0 fb1 of integrated luminosity recorded by the LHCb experiment during 2011 and 2012. The tau lepton is identified in the decay mode τμν¯μντ. The semitauonic decay is sensitive to contributions from non-Standard-Model particles that preferentially couple to the third generation of fermions, in particular Higgs-like charged scalars. A multidimensional fit to kinematic distributions of the candidate B¯0 decays gives R(D)=0.336±0.027(stat)±0.030(syst). This result, which is the first measurement of this quantity at a hadron collider, is 2.1 standard deviations larger than the value expected from lepton universality in the Standard Model.
Copyright/License publication: © 2015-2025 CERN (License: CC-BY-4.0)
preprint: © 2015-2025 CERN (License: CC-BY-4.0)



Corresponding record in: Inspire
Email contact: carnita.hervet@cern.ch


 Record created 2015-06-29, last modified 2024-08-17


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