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Search for the rare decay B→Kνv̄

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We present a search for the rare decays B+→K+ν¯ν and B0→K0ν¯ν using 459×106 B¯¯¯B 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 stand...

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Bibliographic Details
Main Authors: Amo Sanchez, Pablo del (Author) , Adametz, Aleksandra (Author) , Marks, Jörg (Author) , Uwer, Ulrich (Author)
Corporate Author: BABAR Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 8 December 2010
In: Physical review. D, Particles, fields, gravitation, and cosmology
Year: 2010, Volume: 82, Issue: 11, Pages: 1-10
ISSN:1550-2368
DOI:10.1103/PhysRevD.82.112002
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevD.82.112002
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.82.112002
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Author Notes:The BABAR Collaboration

MARC

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520 |a We present a search for the rare decays B+→K+ν¯ν and B0→K0ν¯ν using 459×106 B¯¯¯B 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+ν¯ν, and 5.6×10−5 for B0→K0ν¯ν. We additionally report 90% CL upper limits on partial branching fractions in two ranges of dineutrino mass squared for B+→K+ν¯ν. 
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