Global fits to b -> s ll data and signs for lepton non-universality

There are some slight tensions with the SM predictions within the latest LHCb measurements. Besides the known anomaly in one angular observable of the rare decay B -> K* mu+ mu-, another small discrepancy recently occurred. The ratio R_K = BR(B+ -> K+ mu+ mu-) / BR(B+ -> K+ e+ e-) in the lo...

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Detalles Bibliográficos
Autores principales: Hurth, T., Mahmoudi, F., Neshatpour, S.
Lenguaje:eng
Publicado: 2014
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1007/JHEP12(2014)053
http://cds.cern.ch/record/1955758
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author Hurth, T.
Mahmoudi, F.
Neshatpour, S.
author_facet Hurth, T.
Mahmoudi, F.
Neshatpour, S.
author_sort Hurth, T.
collection CERN
description There are some slight tensions with the SM predictions within the latest LHCb measurements. Besides the known anomaly in one angular observable of the rare decay B -> K* mu+ mu-, another small discrepancy recently occurred. The ratio R_K = BR(B+ -> K+ mu+ mu-) / BR(B+ -> K+ e+ e-) in the low-q^2 region has been measured by LHCb showing a 2.6 sigma deviation from the SM prediction. In contrast to the anomaly in the rare decay B -> K* mu+ mu- which is affected by power corrections, the ratio R_K is theoretically rather clean. We analyse all the b -> s ll data with global fits and in particular explore the possibility of breaking of lepton universality. Possible cross-checks with an analysis of the inclusive B -> X_s l+ l- decay are also explored.
id cern-1955758
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2014
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spelling cern-19557582023-03-12T04:18:00Zdoi:10.1007/JHEP12(2014)053http://cds.cern.ch/record/1955758engHurth, T.Mahmoudi, F.Neshatpour, S.Global fits to b -> s ll data and signs for lepton non-universalityParticle Physics - PhenomenologyThere are some slight tensions with the SM predictions within the latest LHCb measurements. Besides the known anomaly in one angular observable of the rare decay B -> K* mu+ mu-, another small discrepancy recently occurred. The ratio R_K = BR(B+ -> K+ mu+ mu-) / BR(B+ -> K+ e+ e-) in the low-q^2 region has been measured by LHCb showing a 2.6 sigma deviation from the SM prediction. In contrast to the anomaly in the rare decay B -> K* mu+ mu- which is affected by power corrections, the ratio R_K is theoretically rather clean. We analyse all the b -> s ll data with global fits and in particular explore the possibility of breaking of lepton universality. Possible cross-checks with an analysis of the inclusive B -> X_s l+ l- decay are also explored.There are some slight tensions with the SM predictions within the latest LHCb measurements. Besides the known anomaly in one angular observable of the rare decay B → K$^{*}$ μ$^{+}$ μ$^{−}$, another small discrepancy recently occurred. The ratio R$_{K}$ = BR(B$^{+}$ → K$^{+}$ μ$^{+}$ μ$^{−}$)/BR(B$^{+}$ → K$^{+}$ e$^{+}$ e$^{−}$) in the low-q$^{2}$ region has been measured by LHCb showing a 2.6σ deviation from the SM prediction. In contrast to the anomaly in the rare decay B → K$^{*}$ μ$^{+}$ μ$^{−}$ which is affected by power corrections, the ratio R$_{K}$ is theoretically rather clean. We analyse all the b → sℓℓ data with global fits and in particular explore the possibility of breaking of lepton universality. Possible cross-checks with an analysis of the inclusive B → X$_{s}$ ℓ$^{+}$ ℓ$^{−}$ decay are also explored.There are some slight tensions with the SM predictions within the latest LHCb measurements. Besides the known anomaly in one angular observable of the rare decay B -> K* mu+ mu-, another small discrepancy recently occurred. The ratio R_K = BR(B+ -> K+ mu+ mu-) / BR(B+ -> K+ e+ e-) in the low-q^2 region has been measured by LHCb showing a 2.6 sigma deviation from the SM prediction. In contrast to the anomaly in the rare decay B -> K* mu+ mu- which is affected by power corrections, the ratio R_K is theoretically rather clean. We analyse all the b -> s ll data with global fits and in particular explore the possibility of breaking of lepton universality. Possible cross-checks with an analysis of the inclusive B -> X_s l+ l- decay are also explored.arXiv:1410.4545CERN-PH-TH-2014-198MITP-14-078CERN-PH-TH-2014-198MITP-14-078oai:cds.cern.ch:19557582014-10-16
spellingShingle Particle Physics - Phenomenology
Hurth, T.
Mahmoudi, F.
Neshatpour, S.
Global fits to b -> s ll data and signs for lepton non-universality
title Global fits to b -> s ll data and signs for lepton non-universality
title_full Global fits to b -> s ll data and signs for lepton non-universality
title_fullStr Global fits to b -> s ll data and signs for lepton non-universality
title_full_unstemmed Global fits to b -> s ll data and signs for lepton non-universality
title_short Global fits to b -> s ll data and signs for lepton non-universality
title_sort global fits to b -> s ll data and signs for lepton non-universality
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1007/JHEP12(2014)053
http://cds.cern.ch/record/1955758
work_keys_str_mv AT hurtht globalfitstobslldataandsignsforleptonnonuniversality
AT mahmoudif globalfitstobslldataandsignsforleptonnonuniversality
AT neshatpours globalfitstobslldataandsignsforleptonnonuniversality

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