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Towards establishing lepton flavor universality violation in $\overline{B}\to\overline{K}^*\ell^+\ell^-$ decays


Mauri, Andrea; Serra, Nicola; Silva Coutinho, Rafael (2019). Towards establishing lepton flavor universality violation in $\overline{B}\to\overline{K}^*\ell^+\ell^-$ decays. Physical review D, 99(1):013007.

Abstract

Rare semileptonic $b\to s\ell^+\ell^-$ transitions provide some of the most promising frameworks to search for new physics effects. Recent analyses of these decays have indicated an anomalous behavior in measurements of angular distributions of the decay $B^0\to\ K^*\mu^+\mu^-$ and lepton-flavor-universality observables. Unambiguously establishing if these deviations have a common nature is of paramount importance in order to understand the observed pattern. We propose a novel approach to independently and complementary probe this hypothesis by performing a simultaneous amplitude analysis of $\overline{B}^0\to\overline{K}^{*0}\mu^+\mu^-$ and $\overline{B}^0\to\overline{K}^{*0}e^+e^-$ decays. This method enables the direct determination of observables that encode potential non-equal couplings of muons and electrons, and are found to be insensitive to nonperturbative QCD effects. If current hints of new physics are confirmed, our approach could allow an early discovery of physics beyond the standard model with LHCb run II data sets.

Abstract

Rare semileptonic $b\to s\ell^+\ell^-$ transitions provide some of the most promising frameworks to search for new physics effects. Recent analyses of these decays have indicated an anomalous behavior in measurements of angular distributions of the decay $B^0\to\ K^*\mu^+\mu^-$ and lepton-flavor-universality observables. Unambiguously establishing if these deviations have a common nature is of paramount importance in order to understand the observed pattern. We propose a novel approach to independently and complementary probe this hypothesis by performing a simultaneous amplitude analysis of $\overline{B}^0\to\overline{K}^{*0}\mu^+\mu^-$ and $\overline{B}^0\to\overline{K}^{*0}e^+e^-$ decays. This method enables the direct determination of observables that encode potential non-equal couplings of muons and electrons, and are found to be insensitive to nonperturbative QCD effects. If current hints of new physics are confirmed, our approach could allow an early discovery of physics beyond the standard model with LHCb run II data sets.

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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:29 January 2019
Deposited On:20 Aug 2019 11:38
Last Modified:28 Feb 2020 08:04
Publisher:American Physical Society
ISSN:2470-0010
OA Status:Green
Publisher DOI:https://doi.org/10.1103/physrevd.99.013007
Project Information:
  • : FunderSNSF
  • : Grant IDPP00P2_173104
  • : Project TitleWhat's behind Flavour Anomalies?
  • : FunderSNSF
  • : Grant IDPZ00P2_174182
  • : Project TitleFlavour anomalies and matter-antimatter asymmetry in b-baryon decays

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