Decoding the B → K ν ν excess at Belle II: Kinematics, operators, and masses

Fridell, Kåre; Ghosh, Mitrajyoti; Okui, Takemichi; Tobioka, Kohsaku

doi:10.1103/PhysRevD.109.115006

Decoding the $B \to K ν ν$ excess at Belle II: Kinematics, operators, and masses

Journal Article · Fri Jun 07 00:00:00 EDT 2024 · Physical Review. D.

DOI:https://doi.org/10.1103/PhysRevD.109.115006· OSTI ID:2474162

Fridell, Kåre; Ghosh, Mitrajyoti; ;

An excess in the branching fraction for $B^{+} \to K^{+} ν ν$ recently measured at Belle II may be a hint of new physics. We perform thorough likelihood analyses for different new physics scenarios such as $B \to K X$ with a new invisible particle $X$ , or $B \to K χ χ$ through a scalar, vector, or tensor current with $χ$ being a new invisible particle or a neutrino. We find that vector-current three-body decay with $m_{X} ≃ 0.6$ GeV—which may be dark matter—is most favored, while two-body decay with $m_{X} ≃ 2 GeV$ is also competitive. The best-fit branching fractions for the scalar and tensor cases are a few times larger than for the two-body and vector cases. Past measurements provide further discrimination, although the best-fit parameters stay similar.

Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0010102

OSTI ID:: 2474162

Alternate ID(s):: OSTI ID: 2426401

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 11 Vol. 109; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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