Search for the Lepton-Flavor-Violating Decays Bs0 →τ±μâ" and B0 →τ±μâ"

LHCb Collaboration

Research output: Contribution to journalArticle

Abstract

Results are reported from a search for the rare decays Bs0→τ±μâ" and B0→τ±μâ", 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±μâ", the upper limit B(Bs0→τ±μâ")<4.2×10-5 is obtained at 95% confidence level. If no contribution from Bs0→τ±μâ" is assumed, a limit of B(B0→τ±μâ")<1.4×10-5 is obtained at 95% confidence level. These results represent the first limit on B(Bs0→τ±μâ") and the most stringent limit on B(B0→τ±μâ").

Original languageEnglish
Article number211801
JournalPhysical Review Letters
Volume123
Issue number21
DOIs
Publication statusPublished - 22 Nov 2019

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leptons
decay
confidence
protons
neutrinos
physics
collisions

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  • Physics and Astronomy(all)

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Search for the Lepton-Flavor-Violating Decays Bs0 →τ±μâ" and B0 →τ±μâ". / LHCb Collaboration.

In: Physical Review Letters, Vol. 123, No. 21, 211801, 22.11.2019.

Research output: Contribution to journalArticle

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abstract = "Results are reported from a search for the rare decays Bs0→τ±μ{\^a}{"} and B0→τ±μ{\^a}{"}, 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{\^a}{"}, the upper limit B(Bs0→τ±μ{\^a}{"})<4.2×10-5 is obtained at 95{\%} confidence level. If no contribution from Bs0→τ±μ{\^a}{"} is assumed, a limit of B(B0→τ±μ{\^a}{"})<1.4×10-5 is obtained at 95{\%} confidence level. These results represent the first limit on B(Bs0→τ±μ{\^a}{"}) and the most stringent limit on B(B0→τ±μ{\^a}{"}).",
author = "{LHCb Collaboration} and R. Aaij and {Abell{\'a}n Beteta}, C. and B. Adeva and M. Adinolfi and Aidala, {C. A.} and Z. Ajaltouni and S. Akar and P. Albicocco and J. Albrecht and F. Alessio and M. Alexander and {Alfonso Albero}, A. and G. Alkhazov and {Alvarez Cartelle}, P. and Alves, {A. A.} and S. Amato and Y. Amhis and L. An and L. Anderlini and G. Andreassi and M. Andreotti and Andrews, {J. E.} and F. Archilli and {Arnau Romeu}, J. and A. Artamonov and M. Artuso and K. Arzymatov and E. Aslanides and M. Atzeni and B. Audurier and S. Bachmann and Back, {J. J.} and S. Baker and V. Balagura and W. Baldini and A. Baranov and Barlow, {R. J.} and S. Barsuk and W. Barter and M. Bartolini and F. Baryshnikov and V. Batozskaya and B. Batsukh and A. Battig and V. Battista and A. Bay and F. Bedeschi and A. Petrov and S. Strokov and A. Vagner",
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