Determination of the B̄→D*ℓν̄ decay width and |V cb|
In the standard model, the charged current of the weak interaction is governed by a unitary quark mixing matrix that also leads to CP violation. Measurement of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements is essential to searches for new physics, either through the structure of the CKM matrix...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2003
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| _version_ | 1797058170009419776 |
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| author | Adam, N Alexander, J Bebek, C Berger, B Berkelman, K Blanc, F Boisvert, V Cassel, D Drell, P Duboscq, J Ecklund, K Ehrlich, R Gibbons, L Gittelman, B Gray, S Hartill, D Heltsley, B Hsu, L Jones, C Kandaswamy, J Kreinick, D Magerkurth, A Mahlke-Krüger, H Meyer, T Mistry, N |
| author_facet | Adam, N Alexander, J Bebek, C Berger, B Berkelman, K Blanc, F Boisvert, V Cassel, D Drell, P Duboscq, J Ecklund, K Ehrlich, R Gibbons, L Gittelman, B Gray, S Hartill, D Heltsley, B Hsu, L Jones, C Kandaswamy, J Kreinick, D Magerkurth, A Mahlke-Krüger, H Meyer, T Mistry, N |
| author_sort | Adam, N |
| collection | OXFORD |
| description | In the standard model, the charged current of the weak interaction is governed by a unitary quark mixing matrix that also leads to CP violation. Measurement of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements is essential to searches for new physics, either through the structure of the CKM matrix, or a departure from unitarity. We determine the CKM matrix element |V cb| using a sample of 3×10 6 BB̄ events in the CLEO detector at the Cornell Electron Storage Ring. We determine the yield of reconstructed B̄ 0 →D* + ℓν̄ and B -D* 0ℓν̄ decays as a function of w, the boost of the D* in the B rest frame, and from this we obtain the differential decay rate dΓ/dw. By extrapolating dΓ/dw to w = 1, the kinematic end point at which the D* is at rest relative to the B, we extract the product |V cb|ℱ(1), where ℱ(1) is the form factor at w=1. We find |V cb|ℱ(1) = 0.0431±0.0013(stat) ±0.0018(syst). We combine |V cb|ℱ(1) with theoretical results for ℱ(1) to determine |V cb| = 0.0469±0.0014(stat) ±0.0020(syst)±0.0018(theor). We also integrate the differential decay rate over w to obtain B(B̄ 0→D * +ℓν̄ = (609±0.19±0.40)% and B(B -→D* 0ℓν̄) = (6.50±0. 20±0.43)%. © 2003 The American Physical Society. |
| first_indexed | 2024-03-06T19:46:47Z |
| format | Journal article |
| id | oxford-uuid:2291f217-e022-43f1-8feb-d4da3b0f71c8 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T19:46:47Z |
| publishDate | 2003 |
| record_format | dspace |
| spelling | oxford-uuid:2291f217-e022-43f1-8feb-d4da3b0f71c82022-03-26T11:39:32ZDetermination of the B̄→D*ℓν̄ decay width and |V cb|Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:2291f217-e022-43f1-8feb-d4da3b0f71c8EnglishSymplectic Elements at Oxford2003Adam, NAlexander, JBebek, CBerger, BBerkelman, KBlanc, FBoisvert, VCassel, DDrell, PDuboscq, JEcklund, KEhrlich, RGibbons, LGittelman, BGray, SHartill, DHeltsley, BHsu, LJones, CKandaswamy, JKreinick, DMagerkurth, AMahlke-Krüger, HMeyer, TMistry, NIn the standard model, the charged current of the weak interaction is governed by a unitary quark mixing matrix that also leads to CP violation. Measurement of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements is essential to searches for new physics, either through the structure of the CKM matrix, or a departure from unitarity. We determine the CKM matrix element |V cb| using a sample of 3×10 6 BB̄ events in the CLEO detector at the Cornell Electron Storage Ring. We determine the yield of reconstructed B̄ 0 →D* + ℓν̄ and B -D* 0ℓν̄ decays as a function of w, the boost of the D* in the B rest frame, and from this we obtain the differential decay rate dΓ/dw. By extrapolating dΓ/dw to w = 1, the kinematic end point at which the D* is at rest relative to the B, we extract the product |V cb|ℱ(1), where ℱ(1) is the form factor at w=1. We find |V cb|ℱ(1) = 0.0431±0.0013(stat) ±0.0018(syst). We combine |V cb|ℱ(1) with theoretical results for ℱ(1) to determine |V cb| = 0.0469±0.0014(stat) ±0.0020(syst)±0.0018(theor). We also integrate the differential decay rate over w to obtain B(B̄ 0→D * +ℓν̄ = (609±0.19±0.40)% and B(B -→D* 0ℓν̄) = (6.50±0. 20±0.43)%. © 2003 The American Physical Society. |
| spellingShingle | Adam, N Alexander, J Bebek, C Berger, B Berkelman, K Blanc, F Boisvert, V Cassel, D Drell, P Duboscq, J Ecklund, K Ehrlich, R Gibbons, L Gittelman, B Gray, S Hartill, D Heltsley, B Hsu, L Jones, C Kandaswamy, J Kreinick, D Magerkurth, A Mahlke-Krüger, H Meyer, T Mistry, N Determination of the B̄→D*ℓν̄ decay width and |V cb| |
| title | Determination of the B̄→D*ℓν̄ decay width and |V cb| |
| title_full | Determination of the B̄→D*ℓν̄ decay width and |V cb| |
| title_fullStr | Determination of the B̄→D*ℓν̄ decay width and |V cb| |
| title_full_unstemmed | Determination of the B̄→D*ℓν̄ decay width and |V cb| |
| title_short | Determination of the B̄→D*ℓν̄ decay width and |V cb| |
| title_sort | determination of the b d lν̄ decay width and v cb |
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