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Diquark explanation of b→sℓ+ℓ-


Crivellin, Andreas; Kirk, Matthew (2023). Diquark explanation of b→sℓ+ℓ-. Physical review D, 108(11):L111701.

Abstract

The discrepancies between b→sℓ+ℓ− data and the corresponding Standard Model predictions point to the existence of new physics with a significance at the 5σ level. While previously a lepton flavor universality violating effect was preferred, the new R(K(*)) and Bs→μ+μ− measurements are now compatible with the Standard Model, favoring a lepton flavor universal beyond the Standard Model contribution to C9. Since heavy new physics is generally chiral, and because of the stringent constraints from charged lepton flavor violation, this poses a challenge for model building. In this article, we point out a novel possibility: a diquark, i.e., a colored scalar, induces the Wilson coefficient of the (¯sγμPLb)(¯cγμPLc) operator at tree-level, which then mixes into O9 via an off-shell photon penguin. This setup allows for a lepton flavor universal effect of C9≈−0.5, without violating bounds from ΔMs, ΔΓ, B→Xsγ and D0−¯D0 mixing. This scenario predicts a small and negative C′9 and a light diquark, preferably with a mass around 500 GeV, as compatible with the CMS di-dijet analysis, and a deficit in the inclusive b→c¯cs rate.

Abstract

The discrepancies between b→sℓ+ℓ− data and the corresponding Standard Model predictions point to the existence of new physics with a significance at the 5σ level. While previously a lepton flavor universality violating effect was preferred, the new R(K(*)) and Bs→μ+μ− measurements are now compatible with the Standard Model, favoring a lepton flavor universal beyond the Standard Model contribution to C9. Since heavy new physics is generally chiral, and because of the stringent constraints from charged lepton flavor violation, this poses a challenge for model building. In this article, we point out a novel possibility: a diquark, i.e., a colored scalar, induces the Wilson coefficient of the (¯sγμPLb)(¯cγμPLc) operator at tree-level, which then mixes into O9 via an off-shell photon penguin. This setup allows for a lepton flavor universal effect of C9≈−0.5, without violating bounds from ΔMs, ΔΓ, B→Xsγ and D0−¯D0 mixing. This scenario predicts a small and negative C′9 and a light diquark, preferably with a mass around 500 GeV, as compatible with the CMS di-dijet analysis, and a deficit in the inclusive b→c¯cs rate.

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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
Scopus Subject Areas:Physical Sciences > Nuclear and High Energy Physics
Language:English
Date:1 December 2023
Deposited On:29 Dec 2023 09:34
Last Modified:28 Jun 2024 03:31
Publisher:American Physical Society
ISSN:2470-0010
OA Status:Hybrid
Publisher DOI:https://doi.org/10.1103/physrevd.108.l111701
Project Information:
  • : FunderMinisterio de Ciencia e Innovación
  • : Grant ID
  • : Project Title
  • Content: Published Version
  • Language: English
  • Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)