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  • Open Access

Impact of new invisible particles on B→K(*)Emiss observables

Patrick D. Bolton*

Svjetlana Fajfer† and Jernej F. Kamenik1,‡

Martín Novoa-Brunet§

  • *Contact author: patrick.bolton@ijs.si
  • †Contact author: svjetlana.fajfer@ijs.si
  • ‡Contact author: jernej.kamenik@cern.ch
  • §Contact author: martin.novoa@ific.uv.es
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Phys. Rev. D 112, 035010 – Published 8 August, 2025

DOI: https://doi.org/10.1103/9rrv-ft75

Abstract

Motivated by a recent Belle II measurement that suggests an excess in the rare decay B→KEmiss, and building upon our recent differential decay rate likelihood analysis of the existing experimental information, we investigate possible new physics (NP) scenarios in which light invisible states participate in flavor-changing b→s transitions. In particular, we consider the total and differential B→K*Emiss decay rates and K* polarization effects in each NP scenario preferred by the B→KEmiss measurement. We show that future measurements of these B→K*Emiss observables will offer decisive discrimination among the different NP explanations. Our results highlight the strong complementarity of the rare semi-invisible b-hadron decay observables, and underline the importance of analysing their momentum transfer spectra when probing extensions of the Standard Model that feature new light degrees of freedom.

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Phys. Rev. D 112, 035010– Published 8 August, 2025
  • Received 1 April 2025
  • Accepted 16 July 2025
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