The first searches for B0→K+π-τ+τ- and Bs0→K+K-τ+τ- decays at the LHCb experiment are conducted with pp collision data corresponding to an integrated luminosity of 5.4 fb-1. The tau leptons are reconstructed using the τ+→μ+ν¯τνμ decay and the results are presented in bins of K+π- or K+K- mass. No signal is observed and upper limits are set on the branching fractions. The searches result in the first upper limits for B0→K+π-τ+τ- decays outside the K∗(892)0 region in K+π- mass and the first limits for Bs0→K+K-τ+τ- decays. The searches are recast into limits on the decays B0→K∗(892)0τ+τ- and Bs0→φ(1020)τ+τ-, yielding 2.8×10-4 (2.5×10-4) and 4.7×10-4 (4.1×10-4) at the 95% (90%) confidence level, respectively. For the decay B0→K∗(892)0τ+τ-, this result improves on the current best upper limit by an order of magnitude.

Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adefisoye, A., et al. (2026). Searches for B0 →k+π-τ+τ- and Bs0 →k+K-τ+τ- Decays. PHYSICAL REVIEW LETTERS, 136(18) [10.1103/y968-44v8].

Searches for B0 →k+π-τ+τ- and Bs0 →k+K-τ+τ- Decays

Anelli A.;Borsato M.;Calvi M.;Capelli S.;Carniti P.;Falcao L. N.;Fazzini D.;Gotti C.;Kirsebom V. S.;Malentacca L.;Martinazzoli L.;Martinelli M.;Minotti A.;Pizzichemi M.;Salomoni M.;
2026

Abstract

The first searches for B0→K+π-τ+τ- and Bs0→K+K-τ+τ- decays at the LHCb experiment are conducted with pp collision data corresponding to an integrated luminosity of 5.4 fb-1. The tau leptons are reconstructed using the τ+→μ+ν¯τνμ decay and the results are presented in bins of K+π- or K+K- mass. No signal is observed and upper limits are set on the branching fractions. The searches result in the first upper limits for B0→K+π-τ+τ- decays outside the K∗(892)0 region in K+π- mass and the first limits for Bs0→K+K-τ+τ- decays. The searches are recast into limits on the decays B0→K∗(892)0τ+τ- and Bs0→φ(1020)τ+τ-, yielding 2.8×10-4 (2.5×10-4) and 4.7×10-4 (4.1×10-4) at the 95% (90%) confidence level, respectively. For the decay B0→K∗(892)0τ+τ-, this result improves on the current best upper limit by an order of magnitude.
Articolo in rivista - Articolo scientifico
'current; Branching fractions; Confidence levels; Integrated luminosity; Orders of magnitude; Upper limits
English
5-mag-2026
2026
136
18
181802
none
Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adefisoye, A., et al. (2026). Searches for B0 →k+π-τ+τ- and Bs0 →k+K-τ+τ- Decays. PHYSICAL REVIEW LETTERS, 136(18) [10.1103/y968-44v8].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/609641
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