We search for the flavor-changing neutral-current decays B→K(*)νν¯, and the invisible decays J/ψ→νν¯ and ψ(2S)→νν¯ via B→K(*)J/ψ and B→K(*)ψ(2S), respectively, using a data sample of 471×106 BB¯ pairs collected by the BABAR experiment. We fully reconstruct the hadronic decay of one of the B mesons in the Υ(4S)→BB¯ decay, and search for the B→K(*)νν¯ decay in the rest of the event. We observe no significant excess of signal decays over background and report branching fraction upper limits of B(B+→K+νν¯)<3.7×10-5, B(B0→K0νν¯)<8.1×10-5, B(B+→K*+νν¯)<11.6×10-5, B(B0→K*0νν¯)<9.3×10-5, and combined upper limits of B(B→Kνν¯)<3.2×10-5 and B(B→K*νν¯)<7.9×10-5, all at the 90% confidence level. For the invisible quarkonium decays, we report branching fraction upper limits of B(J/ψ→νν¯)<3.9×10-3 and B(ψ(2S)→νν¯)<15.5×10-3 at the 90% confidence level. Using the improved kinematic resolution achieved from hadronic reconstruction, we also provide partial branching fraction limits for the B→K(*)νν¯ decays over the full kinematic spectrum.

Search for B→K^{(*)}νν[over ¯] and invisible quarkonium decays

LANCERI, LIVIO;VITALE, LORENZO;
2013

Abstract

We search for the flavor-changing neutral-current decays B→K(*)νν¯, and the invisible decays J/ψ→νν¯ and ψ(2S)→νν¯ via B→K(*)J/ψ and B→K(*)ψ(2S), respectively, using a data sample of 471×106 BB¯ pairs collected by the BABAR experiment. We fully reconstruct the hadronic decay of one of the B mesons in the Υ(4S)→BB¯ decay, and search for the B→K(*)νν¯ decay in the rest of the event. We observe no significant excess of signal decays over background and report branching fraction upper limits of B(B+→K+νν¯)<3.7×10-5, B(B0→K0νν¯)<8.1×10-5, B(B+→K*+νν¯)<11.6×10-5, B(B0→K*0νν¯)<9.3×10-5, and combined upper limits of B(B→Kνν¯)<3.2×10-5 and B(B→K*νν¯)<7.9×10-5, all at the 90% confidence level. For the invisible quarkonium decays, we report branching fraction upper limits of B(J/ψ→νν¯)<3.9×10-3 and B(ψ(2S)→νν¯)<15.5×10-3 at the 90% confidence level. Using the improved kinematic resolution achieved from hadronic reconstruction, we also provide partial branching fraction limits for the B→K(*)νν¯ decays over the full kinematic spectrum.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11368/2768944
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