Search for the lepton-flavour-violating decays $B^{0}_{s}\to\tau^{\pm}\mu^{\mp}$ and $B^{0}\to\tau^{\pm}\mu^{\mp}$ - INSPIRE

DataBETA

Search for the lepton-flavour-violating decays $B^{0}_{s}\to\tau^{\pm}\mu^{\mp}$ and $B^{0}\to\tau^{\pm}\mu^{\mp}$

LHCb

Collaboration

May 16, 2019

11 pages

Published in:

Phys.Rev.Lett. 123 (2019) 21, 211801

Published: Nov 22, 2019

e-Print:

1905.06614 [hep-ex]

DOI:

10.1103/PhysRevLett.123.211801

PDG:

{{\mathit B}^{0}}

\rightarrow

{{\mathit \mu}^{\pm}}{{\mathit \tau}^{\mp}}

Report number:

CERN-EP-2019-076,
LHCb-PAPER-2019-016

Experiments:

CERN-LHC-LHCb

View in:

reference search111 citations

Citations per year

Abstract: (APS)

Results are reported from a search for the rare decays Bs0→τ±μ∓ and B0→τ±μ∓, where the τ lepton is reconstructed in the channel τ-→π-π+π-ντ. These processes are effectively forbidden in the standard model, but they can potentially occur at detectable rates in models of new physics that can induce lepton-flavor-violating decays. The search is based on a data sample corresponding to 3 fb-1 of proton-proton collisions recorded by the LHCb experiment in 2011 and 2012. The event yields observed in the signal regions for both processes are consistent with the expected standard model backgrounds. Because of the limited mass resolution arising from the undetected τ neutrino, the Bs0 and B0 signal regions are highly overlapping. Assuming no contribution from B0→τ±μ∓, the upper limit B(Bs0→τ±μ∓)<4.2×10-5 is obtained at 95% confidence level. If no contribution from Bs0→τ±μ∓ is assumed, a limit of B(B0→τ±μ∓)<1.4×10-5 is obtained at 95% confidence level. These results represent the first limit on B(Bs0→τ±μ∓) and the most stringent limit on B(B0→τ±μ∓).

Note:

15 pages, 5 figures. All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2019-016.html

Elementary Particles and Fields
p p: scattering
p p: colliding beams
B/s0: rare decay
B0: rare decay
B/s0: leptonic decay
B0: leptonic decay
tau: semileptonic decay
B/s0: branching ratio: upper limit
B0: branching ratio: upper limit

References(37)

Figures(8)

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