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Correlating lepton flavor universality violation in B decays with $\mu \to eγ$ using leptoquarks


Crivellin, Andreas; Müller, Dario; Signer, Adrian; Ulrich, Yannick (2018). Correlating lepton flavor universality violation in B decays with $\mu \to eγ$ using leptoquarks. Physical review D, 97:015019.

Abstract

Motivated by the measurements of b→sℓ+ℓ− transitions, including R(K) and R(K∗), we examine lepton flavor (universality) violation in B decays and its connections to μ→eγ in generic leptoquark models. Considering all 10 representations of scalar and vector leptoquarks under the Standard Model gauge group we compute the tree-level matching for semileptonic b-quark operators as well as their loop effects in ℓ→ℓ′γ. In our phenomenological analysis, we correlate R(K), R(K∗) and the other b→sμ+μ− data to μ→eγ and b→sμe transitions for the three leptoquark representations that generate left-handed currents in b→sℓ+ℓ− transitions and, therefore, provide a good fit to data. We find that while new physics contributions to muons are required by the global fit, couplings to electrons can be sizeable without violating the stringent bounds from μ→eγ. In fact, if the effect in electrons in b→sℓ+ℓ− has the opposite sign from the effect in muons, the bound from μ→eγ can always be avoided. However, unavoidable effects in b→sμe transitions (i.e. Bs→μe, B→Kμe, etc.) appear that are within the reach of LHCb and BELLE II.

Abstract

Motivated by the measurements of b→sℓ+ℓ− transitions, including R(K) and R(K∗), we examine lepton flavor (universality) violation in B decays and its connections to μ→eγ in generic leptoquark models. Considering all 10 representations of scalar and vector leptoquarks under the Standard Model gauge group we compute the tree-level matching for semileptonic b-quark operators as well as their loop effects in ℓ→ℓ′γ. In our phenomenological analysis, we correlate R(K), R(K∗) and the other b→sμ+μ− data to μ→eγ and b→sμe transitions for the three leptoquark representations that generate left-handed currents in b→sℓ+ℓ− transitions and, therefore, provide a good fit to data. We find that while new physics contributions to muons are required by the global fit, couplings to electrons can be sizeable without violating the stringent bounds from μ→eγ. In fact, if the effect in electrons in b→sℓ+ℓ− has the opposite sign from the effect in muons, the bound from μ→eγ can always be avoided. However, unavoidable effects in b→sμe transitions (i.e. Bs→μe, B→Kμe, etc.) appear that are within the reach of LHCb and BELLE II.

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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 > Physics and Astronomy (miscellaneous)
Language:English
Date:29 January 2018
Deposited On:18 Jan 2019 14:28
Last Modified:29 Jul 2020 08:54
Publisher:American Physical Society
ISSN:2470-0010
OA Status:Hybrid
Publisher DOI:https://doi.org/10.1103/physrevd.97.015019
Project Information:
  • : FunderSNSF
  • : Grant IDPZ00P2_154834
  • : Project TitleFlavour Physics beyond the Standard Model
  • : FunderSNSF
  • : Grant ID200021_163466
  • : Project TitleMuon Decays

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