Search for B+→μ+νμ and B+→μ+N with inclusive tagging

Prim, M T and Bernlochner, F U and Giri, Anjan Kumar and et al, . (2019) Search for B+→μ+νμ and B+→μ+N with inclusive tagging.

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We report the result for a search for the leptonic decay of B+→μ+νμ using the full Belle data set of 711 fb−1 of integrated luminosity at the Υ(4S) resonance. In the Standard Model leptonic B-meson decays are helicity and CKM suppressed. To maximize sensitivity an inclusive tagging approach is used to reconstruct the second B meson produced in the collision. The directional information from this second B meson is used to boost the observed μ into the signal B meson rest-frame, in which the μ has a monochromatic momentum spectrum. Though its momentum is smeared by the experimental resolution, this technique improves the analysis sensitivity considerably. Analyzing the μ momentum spectrum in this frame we find B(B+→μ+νμ)=(5.3±2.0±0.9)×10−7 with a one-sided significance of 2.8 standard deviations over the background-only hypothesis. This translates to a frequentist upper limit of B(B+→μ+νμ)<8.6×10−7 at 90% CL. The experimental spectrum is then used to search for a massive sterile neutrino, B+→μ+N, but no evidence is observed for a sterile neutrino with a mass in a range of 0 - 1.5 GeV. The determined B+→μ+νμ branching fraction limit is further used to constrain the mass and coupling space of the type II and type III two-Higgs-doublet models.

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IITH Creators:
IITH CreatorsORCiD
Giri, Anjan KumarUNSPECIFIED
Item Type: Article
Subjects: Physics
Divisions: Department of Physics
Depositing User: Team Library
Date Deposited: 18 Nov 2019 04:34
Last Modified: 18 Nov 2019 05:34
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