Disentangling left and right-handed neutrino effects in

S. Rosauro-Alcaraz; L. P. S. Leal

doi:10.1140/epjc/s10052-024-13104-x

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2024 Impact factor 4.8

Particles and Fields

Open Access

Eur. Phys. J. C (2024) 84: 795
https://doi.org/10.1140/epjc/s10052-024-13104-x

Regular Article - Theoretical Physics

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

S. Rosauro-Alcaraz¹^a and L. P. S. Leal¹^,2

¹ IJCLab, Pôle Théorie (Bat. 210), CNRS/IN2P3, 91405, Orsay, France
² Instituto de Física, Universidade de São Paulo, C.P. 66.318, 05315-970, São Paulo, Brazil

^a salvador.rosauro@ijclab.in2p3.fr

Received: 17 May 2024
Accepted: 6 July 2024
Published online: 10 August 2024

Abstract

The first observation of $B (B^{+} \to K^{+} ν ν)$ $\mathcal {B}\left( B^+\rightarrow K^+\nu \nu \right)$ by the Belle II experiment lies almost $3 σ$ $3\sigma$ 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 $B (B \to K^{*} ν ν)$ $\mathcal {B}\left( B\rightarrow K^*\nu \nu \right)$ and $F_{L} (B \to K^{*} ν ν)$ $F_L\left( B\rightarrow K^*\nu \nu \right)$ , 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.

© The Author(s) 2024

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