Revisiting models that enhance 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mi>K</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mi>ν</mml:mi><mml:mover accent="true"><mml:mi>ν</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover></mml:math>
 in light of the new Belle II measurement

He, Xiao-Gang; Ma, Xiao-Dong; Valencia, German

doi:10.1103/physrevd.109.075019

Phys. Rev. D

2024

DOI: 10.1103/physrevd.109.075019

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Revisiting models that enhance B+→K+νν¯ in light of the new Belle II measurement

Xiao-Gang He,

Xiao-Dong Ma,

German Valencia

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

Fridell,

Ghosh,

Okui

et al. 2024

Phys. Rev. D

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An excess in the branching fraction for B+→K+νν 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→KX with a new invisible particle X, or B→Kχχ 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 mX≃0.6 GeV—which may be dark matter—is most favored, while two-body decay with mX≃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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Decoding the B→Kνν excess at Belle II: Kinematics, operators, and masses

Fridell,

Ghosh,

Okui

et al. 2024

Phys. Rev. D

View full text Add to dashboard Cite

show abstract

Disentangling left and right-handed neutrino effects in $$B\rightarrow K^{(*)}\nu \nu $$

Rosauro-Alcaraz,

Leal

2024

Eur. Phys. J. C

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The first observation of $$\mathcal {B}\left( B^+\rightarrow K^+\nu \nu \right) $$ B B + → K + ν ν by the Belle II experiment lies almost $$3\sigma $$ 3 σ away from the Standard Model expectation. In this letter we study this result in the SMEFT, extended by a light right-handed neutrino. We explore the correlations between the measured decay rate and other observables, such as $$\mathcal {B}\left( B\rightarrow K^*\nu \nu \right) $$ B B → K ∗ ν ν and $$F_L\left( B\rightarrow K^*\nu \nu \right) $$ F L B → K ∗ ν ν , showing that they could disentangle among scenarios involving left-handed neutrinos and those with the right-handed ones. Furthermore, we find that the high-$$p_T$$ p T tails of Drell–Yan processes studied at LHC provide important constraints that help us exclude some of the scenarios consistent with the Belle II result.

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Revisiting models that enhance B+→K+νν¯ in light of the new Belle II measurement

Cited by 2 publications

References 46 publications

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

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

Disentangling left and right-handed neutrino effects in $$B\rightarrow K^{(*)}\nu \nu $$

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