Search for lepton flavour universality violation in $B^+ \rightarrow K^+ℓ^+ℓ^ −$ decays at LHCb

Recent measurements of observables involving the flavour changing neutral current transition b→sμ+μ− have shown an interesting pattern of tensions with respect to the predictions of the Standard Model (SM). However, the interpretation of these results is limited by our present understanding of the h...

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Autor principal: Alvarez Cartelle, Paula
Lenguaje:eng
Publicado: 2019
Materias:
Acceso en línea:http://cds.cern.ch/record/2668971
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author Alvarez Cartelle, Paula
author_facet Alvarez Cartelle, Paula
author_sort Alvarez Cartelle, Paula
collection CERN
description Recent measurements of observables involving the flavour changing neutral current transition b→sμ+μ− have shown an interesting pattern of tensions with respect to the predictions of the Standard Model (SM). However, the interpretation of these results is limited by our present understanding of the hadronic uncertainties affecting these predictions. Given the lepton-flavour-universal nature of the SM, observables such as RK=BR(B+→K+μ+μ−)/BR(B+→K+e+e−), so-called Lepton Flavour Universality ratios, profit from large cancellation of the theory uncertainties and provide a very sensitive probe for physics beyond the SM. The previous measurement of the ratio RK performed by the LHCb collaboration, using Run 1 data, found a value compatible with the SM expectation at the 2.6σ level. In this seminar, a new measurement of RK at the LHCb experiment will be presented. The new measurement reanalyses the data recorded by LHCb during Run 1, and adds data collected during 2015 and 2016. The total dataset is double the size of that previously analysed.
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spelling cern-26689712019-09-30T06:29:59Zhttp://cds.cern.ch/record/2668971engAlvarez Cartelle, PaulaSearch for lepton flavour universality violation in $B^+ \rightarrow K^+ℓ^+ℓ^ −$ decays at LHCbLHC SeminarTalkRecent measurements of observables involving the flavour changing neutral current transition b→sμ+μ− have shown an interesting pattern of tensions with respect to the predictions of the Standard Model (SM). However, the interpretation of these results is limited by our present understanding of the hadronic uncertainties affecting these predictions. Given the lepton-flavour-universal nature of the SM, observables such as RK=BR(B+→K+μ+μ−)/BR(B+→K+e+e−), so-called Lepton Flavour Universality ratios, profit from large cancellation of the theory uncertainties and provide a very sensitive probe for physics beyond the SM. The previous measurement of the ratio RK performed by the LHCb collaboration, using Run 1 data, found a value compatible with the SM expectation at the 2.6σ level. In this seminar, a new measurement of RK at the LHCb experiment will be presented. The new measurement reanalyses the data recorded by LHCb during Run 1, and adds data collected during 2015 and 2016. The total dataset is double the size of that previously analysed.LHCb-TALK-2019-064oai:cds.cern.ch:26689712019
spellingShingle Talk
Alvarez Cartelle, Paula
Search for lepton flavour universality violation in $B^+ \rightarrow K^+ℓ^+ℓ^ −$ decays at LHCb
title Search for lepton flavour universality violation in $B^+ \rightarrow K^+ℓ^+ℓ^ −$ decays at LHCb
title_full Search for lepton flavour universality violation in $B^+ \rightarrow K^+ℓ^+ℓ^ −$ decays at LHCb
title_fullStr Search for lepton flavour universality violation in $B^+ \rightarrow K^+ℓ^+ℓ^ −$ decays at LHCb
title_full_unstemmed Search for lepton flavour universality violation in $B^+ \rightarrow K^+ℓ^+ℓ^ −$ decays at LHCb
title_short Search for lepton flavour universality violation in $B^+ \rightarrow K^+ℓ^+ℓ^ −$ decays at LHCb
title_sort search for lepton flavour universality violation in $b^+ \rightarrow k^+ℓ^+ℓ^ −$ decays at lhcb
topic Talk
url http://cds.cern.ch/record/2668971
work_keys_str_mv AT alvarezcartellepaula searchforleptonflavouruniversalityviolationinbrightarrowklldecaysatlhcb
AT alvarezcartellepaula lhcseminar