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Understanding the first measurement of B(B→Kνν¯)


Allwicher, Lukas; Bečirević, Damir; Piazza, Gregory; Rosauro-Alcaraz, S; Sumensari, Olcyr (2024). Understanding the first measurement of B(B→Kνν¯). Physics Letters B, 848:138411.

Abstract

Recently, Belle II reported on the first measurement of B(B±→K±νν¯) which appears to be almost 3σ larger than predicted in the Standard Model. We point out the important correlation with B(B→K∗νν¯) so that the measurement of that decay mode could help restraining the possible options for building the model of New Physics. We then try to interpret this new experimental result in terms of physics beyond the Standard Model by using SMEFT and find that a scenario with coupling only to τ can accommodate the current experimental constraints but fails in getting a desired RexpD(∗)/RSMD(∗), unless one turns the other SMEFT operators that are not related to b→sℓℓ or/and b→sνν.

Abstract

Recently, Belle II reported on the first measurement of B(B±→K±νν¯) which appears to be almost 3σ larger than predicted in the Standard Model. We point out the important correlation with B(B→K∗νν¯) so that the measurement of that decay mode could help restraining the possible options for building the model of New Physics. We then try to interpret this new experimental result in terms of physics beyond the Standard Model by using SMEFT and find that a scenario with coupling only to τ can accommodate the current experimental constraints but fails in getting a desired RexpD(∗)/RSMD(∗), unless one turns the other SMEFT operators that are not related to b→sℓℓ or/and b→sνν.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Uncontrolled Keywords:Nuclear and High Energy Physics
Language:English
Date:1 January 2024
Deposited On:11 Jan 2024 10:46
Last Modified:28 Jun 2024 03:37
Publisher:Elsevier
ISSN:0370-2693
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1016/j.physletb.2023.138411
Project Information:
  • : FunderHorizon 2020
  • : Grant ID
  • : Project Title
  • Content: Published Version
  • Language: English
  • Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)