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Toward excluding a light Z′ explanation of b→sℓ+ℓ−


Crivellin, Andreas; Manzari, Claudio Andrea; Altmannshofer, Wolfgang; Inguglia, Gianluca; Feichtinger, Paul; Camalich, Jorge Martin (2022). Toward excluding a light Z′ explanation of b→sℓ+ℓ−. Physical review D, 106(3):L031703.

Abstract

The discrepancies between b→sℓ+ℓ− data and the corresponding Standard Model predictions constitute one of the most significant hints for new physics currently available. In fact, many scenarios that can account for these anomalies have been proposed in the literature. However, only a single light new physics explanation, i.e., with a mass below the B meson scale, is possible: a light Z′ boson. In this article, we aim at excluding any light Z′ model as a solution to b→sℓ+ℓ− data, using a minimal and conservative setup. Considering the improved limits on B→K(*)νν, including the experimental sensitivities required for a proper treatment of the necessarily sizable Z′ width, together with the forthcoming Belle II analyses of e+e−→μ+μ−+invisible, can rule out a Z′ explanation of b→sℓ+ℓ− data with a mass below ≈4  GeV. Importantly, such a light Z′ is the only viable single particle solution to the b→sℓ+ℓ− anomalies predicting R(K(*))>0 in high q2 bins, therefore providing an essential consistency test of data.

Abstract

The discrepancies between b→sℓ+ℓ− data and the corresponding Standard Model predictions constitute one of the most significant hints for new physics currently available. In fact, many scenarios that can account for these anomalies have been proposed in the literature. However, only a single light new physics explanation, i.e., with a mass below the B meson scale, is possible: a light Z′ boson. In this article, we aim at excluding any light Z′ model as a solution to b→sℓ+ℓ− data, using a minimal and conservative setup. Considering the improved limits on B→K(*)νν, including the experimental sensitivities required for a proper treatment of the necessarily sizable Z′ width, together with the forthcoming Belle II analyses of e+e−→μ+μ−+invisible, can rule out a Z′ explanation of b→sℓ+ℓ− data with a mass below ≈4  GeV. Importantly, such a light Z′ is the only viable single particle solution to the b→sℓ+ℓ− anomalies predicting R(K(*))>0 in high q2 bins, therefore providing an essential consistency test of data.

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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
Language:English
Date:15 August 2022
Deposited On:08 Sep 2022 15:10
Last Modified:27 Jun 2024 01:39
Publisher:American Physical Society
ISSN:2470-0010
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1103/physrevd.106.l031703
Project Information:
  • : FunderH2020
  • : Grant ID947006
  • : Project TitleInterLeptons - A search for new interactions at Belle II using leptons
  • Content: Published Version
  • Language: English
  • Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)