Measurements of branching fractions, rate asymmetries, and angular distributions in the rare decays B -> Kl(+)l(-) and B -> K(*)l(+)l(-)
We present measurements of the flavor-changing neutral current decays B→K + - and B→K* + -, where + - is either an e+e- or μ+μ- pair. The data sample comprises 229×106Υ(4S)→BB̄ decays collected with the BABAR detector at the PEP-II e+e- storage ring. Flavor-changing neutral current decays are highly...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2006
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| _version_ | 1797051354942799872 |
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| author | Aubert, B Barate, R Bona, M Boutigny, D Couderc, F Karyotakis, Y Lees, J Poireau, V Tisserand, V Zghiche, A Grauges, E Palano, A Pappagallo, M Chen, J Qi, N Rong, G Wang, P Zhu, Y Eigen, G Ofte, I Stugu, B Abrams, G Battaglia, M Brown, D Button-Shafer, J |
| author_facet | Aubert, B Barate, R Bona, M Boutigny, D Couderc, F Karyotakis, Y Lees, J Poireau, V Tisserand, V Zghiche, A Grauges, E Palano, A Pappagallo, M Chen, J Qi, N Rong, G Wang, P Zhu, Y Eigen, G Ofte, I Stugu, B Abrams, G Battaglia, M Brown, D Button-Shafer, J |
| author_sort | Aubert, B |
| collection | OXFORD |
| description | We present measurements of the flavor-changing neutral current decays B→K + - and B→K* + -, where + - is either an e+e- or μ+μ- pair. The data sample comprises 229×106Υ(4S)→BB̄ decays collected with the BABAR detector at the PEP-II e+e- storage ring. Flavor-changing neutral current decays are highly suppressed in the standard model and their predicted properties could be significantly modified by new physics at the electroweak scale. We measure the branching fractions B(B→K + -)=(0.34±0.07±0.02)×10-6, B(B→K* + -)=(0.78-0.17+0.19±0.11)×10-6, the direct CP asymmetries of these decays, and the relative abundances of decays to electrons and muons. For two regions in + - mass, above and below mJ/ψ, we measure partial branching fractions and the forward-backward angular asymmetry of the lepton pair. In these same regions we also measure the K* longitudinal polarization in B→K* + - decays. Upper limits are obtained for the lepton-flavor-violating decays B→Keμ and B→K*eμ. All measurements are consistent with standard model expectations. © 2006 The American Physical Society. |
| first_indexed | 2024-03-06T18:18:20Z |
| format | Journal article |
| id | oxford-uuid:05696cb4-6e80-4ad8-8c51-aa01f872ef97 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T18:18:20Z |
| publishDate | 2006 |
| record_format | dspace |
| spelling | oxford-uuid:05696cb4-6e80-4ad8-8c51-aa01f872ef972022-03-26T08:57:05ZMeasurements of branching fractions, rate asymmetries, and angular distributions in the rare decays B -> Kl(+)l(-) and B -> K(*)l(+)l(-)Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:05696cb4-6e80-4ad8-8c51-aa01f872ef97EnglishSymplectic Elements at Oxford2006Aubert, BBarate, RBona, MBoutigny, DCouderc, FKaryotakis, YLees, JPoireau, VTisserand, VZghiche, AGrauges, EPalano, APappagallo, MChen, JQi, NRong, GWang, PZhu, YEigen, GOfte, IStugu, BAbrams, GBattaglia, MBrown, DButton-Shafer, JWe present measurements of the flavor-changing neutral current decays B→K + - and B→K* + -, where + - is either an e+e- or μ+μ- pair. The data sample comprises 229×106Υ(4S)→BB̄ decays collected with the BABAR detector at the PEP-II e+e- storage ring. Flavor-changing neutral current decays are highly suppressed in the standard model and their predicted properties could be significantly modified by new physics at the electroweak scale. We measure the branching fractions B(B→K + -)=(0.34±0.07±0.02)×10-6, B(B→K* + -)=(0.78-0.17+0.19±0.11)×10-6, the direct CP asymmetries of these decays, and the relative abundances of decays to electrons and muons. For two regions in + - mass, above and below mJ/ψ, we measure partial branching fractions and the forward-backward angular asymmetry of the lepton pair. In these same regions we also measure the K* longitudinal polarization in B→K* + - decays. Upper limits are obtained for the lepton-flavor-violating decays B→Keμ and B→K*eμ. All measurements are consistent with standard model expectations. © 2006 The American Physical Society. |
| spellingShingle | Aubert, B Barate, R Bona, M Boutigny, D Couderc, F Karyotakis, Y Lees, J Poireau, V Tisserand, V Zghiche, A Grauges, E Palano, A Pappagallo, M Chen, J Qi, N Rong, G Wang, P Zhu, Y Eigen, G Ofte, I Stugu, B Abrams, G Battaglia, M Brown, D Button-Shafer, J Measurements of branching fractions, rate asymmetries, and angular distributions in the rare decays B -> Kl(+)l(-) and B -> K(*)l(+)l(-) |
| title | Measurements of branching fractions, rate asymmetries, and angular distributions in the rare decays B -> Kl(+)l(-) and B -> K(*)l(+)l(-) |
| title_full | Measurements of branching fractions, rate asymmetries, and angular distributions in the rare decays B -> Kl(+)l(-) and B -> K(*)l(+)l(-) |
| title_fullStr | Measurements of branching fractions, rate asymmetries, and angular distributions in the rare decays B -> Kl(+)l(-) and B -> K(*)l(+)l(-) |
| title_full_unstemmed | Measurements of branching fractions, rate asymmetries, and angular distributions in the rare decays B -> Kl(+)l(-) and B -> K(*)l(+)l(-) |
| title_short | Measurements of branching fractions, rate asymmetries, and angular distributions in the rare decays B -> Kl(+)l(-) and B -> K(*)l(+)l(-) |
| title_sort | measurements of branching fractions rate asymmetries and angular distributions in the rare decays b gt kl l and b gt k l l |
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