We present a search for the rare decays B⊃+→K⊃+νν̄ and B0→K0νν̄ using 459×106 BB̄ pairs collected with the BABAR detector at the SLAC National Accelerator Laboratory. Flavor-changing neutral-current decays such as these are forbidden at tree level but can occur through one-loop diagrams in the standard model (SM), with possible contributions from new physics at the same order. The presence of two neutrinos in the final state makes identification of signal events challenging, so reconstruction in the semileptonic decay channels B→D(⊃*)lν of the B meson recoiling from the signal B is used to suppress backgrounds. We set an upper limit at the 90% confidence level (CL) of 1.3×10⊃-5 on the total branching fraction for B⊃+→K⊃+νν̄, and 5.6×10⊃-5 for B0→K0νν̄. We additionally report 90% CL upper limits on partial branching fractions in two ranges of dineutrino mass squared for B⊃+→K⊃+νν̄.

Sanchez, P., Lees, J., Poireau, V., Prencipe, E., Tisserand, V., Tico, J., et al. (2010). Search for the rare decay B→Kνν̄. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 82(11) [10.1103/PhysRevD.82.112002].

Search for the rare decay B→Kνν̄

Martinelli M;CARPINELLI, Massimo
Membro del Collaboration Group
;
2010

Abstract

We present a search for the rare decays B⊃+→K⊃+νν̄ and B0→K0νν̄ using 459×106 BB̄ pairs collected with the BABAR detector at the SLAC National Accelerator Laboratory. Flavor-changing neutral-current decays such as these are forbidden at tree level but can occur through one-loop diagrams in the standard model (SM), with possible contributions from new physics at the same order. The presence of two neutrinos in the final state makes identification of signal events challenging, so reconstruction in the semileptonic decay channels B→D(⊃*)lν of the B meson recoiling from the signal B is used to suppress backgrounds. We set an upper limit at the 90% confidence level (CL) of 1.3×10⊃-5 on the total branching fraction for B⊃+→K⊃+νν̄, and 5.6×10⊃-5 for B0→K0νν̄. We additionally report 90% CL upper limits on partial branching fractions in two ranges of dineutrino mass squared for B⊃+→K⊃+νν̄.
Articolo in rivista - Articolo scientifico
BABAR detector
English
Carpinelli Massimo (The BABAR Collaboration)
Sanchez, P., Lees, J., Poireau, V., Prencipe, E., Tisserand, V., Tico, J., et al. (2010). Search for the rare decay B→Kνν̄. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 82(11) [10.1103/PhysRevD.82.112002].
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Gershon, T; Harrison, P; Latham, T; Puccio, E; Band, H; Dasu, S; Flood, K; Pan, Y; Prepost, R; Vuosalo, C; Wu, S
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/389306
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