Search for b-->u transitions in B--->DK- and D*K- decays
We report results from an updated study of the suppressed decays B--->DK- and B--->D*K- followed by D-->K+pi-, where D(*) indicates a D(*)0 or a D[over-bar] (*)0 meson, and D*-->Dpi0 or D*-->Dgamma. These decays are sensitive to the Cabibbo-Kobayashi-Maskawa unitarity triangle angle g...
| Main Authors: | , , , , |
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| Format: | Article |
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American Physical Society
2011
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| Online Access: | http://hdl.handle.net/1721.1/61346 https://orcid.org/0000-0002-8667-5660 |
| _version_ | 1826200505578160128 |
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| author | Sciolla, Gabriella Zhao, M. Dujmic, Denis Fisher, Peter H Cowan, Ray F |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Sciolla, Gabriella Zhao, M. Dujmic, Denis Fisher, Peter H Cowan, Ray F |
| author_sort | Sciolla, Gabriella |
| collection | MIT |
| description | We report results from an updated study of the suppressed decays B--->DK- and B--->D*K- followed by D-->K+pi-, where D(*) indicates a D(*)0 or a D[over-bar] (*)0 meson, and D*-->Dpi0 or D*-->Dgamma. These decays are sensitive to the Cabibbo-Kobayashi-Maskawa unitarity triangle angle gamma due to interference between the b-->c transition B--->D(*)0K- followed by the doubly Cabibbo-suppressed decay D0-->K+pi-, and the b-->u transition B--->D[over-bar] (*)0K- followed by the Cabibbo-favored decay D[over-bar] 0-->K+pi-. We also report an analysis of the decay B--->D(*)pi- with the D decaying into the doubly Cabibbo-suppressed mode D-->K+pi-. Our results are based on 467× 106 Υ(4S)-->BB[over-bar] decays collected with the BABAR detector at SLAC. We measure the ratios R(*) of the suppressed ([K+pi-]DK-/pi-) to favored ([K-pi+]DK-/pi-) branching fractions as well as the CP asymmetries A(*) of those modes. We see indications of signals for the B--->DK- and B--->DDpi0*K- suppressed modes, with statistical significances of 2.1 and 2.2σ, respectively, and we measure: RDK=(1.1±0.6±0.2)×10-2, ADK=-0.86±0.47-0.16+0.12, R(Dpi0)K*=(1.8±0.9± 0.4)×10-2, A(Dpi0)K*=+0.77±0.35±0.12, R(Dgamma)K*=(1.3±1.4±0.8)×10-2,A(Dgamma)K*=+0.36 ±0.94-0.41+0.25, where the first uncertainty is statistical and the second is systematic. We use a frequentist approach to obtain the magnitude of the ratio rB≡|A(B--->D[over-bar] 0K-)/A(B--->D0K-)|=(9.5-4.1+5.1)%, with rB<16.7% at 90% confidence level. In the case of B--->D*K- we find rB*≡|A(B--->D[over-bar] *0K-)/A(B--->D*0K-)|=(9.6-5.1+3.5)%, with rB*<15.0% at 90% confidence level. |
| first_indexed | 2024-09-23T11:37:31Z |
| format | Article |
| id | mit-1721.1/61346 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T11:37:31Z |
| publishDate | 2011 |
| publisher | American Physical Society |
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| spelling | mit-1721.1/613462023-02-26T08:08:47Z Search for b-->u transitions in B--->DK- and D*K- decays Search for b→u transitions in B-→DK- and D*K- decays Sciolla, Gabriella Zhao, M. Dujmic, Denis Fisher, Peter H Cowan, Ray F Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Fisher, Peter H. Sciolla, Gabriella Fisher, Peter H. Cowan, Ray Franklin Zhao, M. Dujmic, Denis We report results from an updated study of the suppressed decays B--->DK- and B--->D*K- followed by D-->K+pi-, where D(*) indicates a D(*)0 or a D[over-bar] (*)0 meson, and D*-->Dpi0 or D*-->Dgamma. These decays are sensitive to the Cabibbo-Kobayashi-Maskawa unitarity triangle angle gamma due to interference between the b-->c transition B--->D(*)0K- followed by the doubly Cabibbo-suppressed decay D0-->K+pi-, and the b-->u transition B--->D[over-bar] (*)0K- followed by the Cabibbo-favored decay D[over-bar] 0-->K+pi-. We also report an analysis of the decay B--->D(*)pi- with the D decaying into the doubly Cabibbo-suppressed mode D-->K+pi-. Our results are based on 467× 106 Υ(4S)-->BB[over-bar] decays collected with the BABAR detector at SLAC. We measure the ratios R(*) of the suppressed ([K+pi-]DK-/pi-) to favored ([K-pi+]DK-/pi-) branching fractions as well as the CP asymmetries A(*) of those modes. We see indications of signals for the B--->DK- and B--->DDpi0*K- suppressed modes, with statistical significances of 2.1 and 2.2σ, respectively, and we measure: RDK=(1.1±0.6±0.2)×10-2, ADK=-0.86±0.47-0.16+0.12, R(Dpi0)K*=(1.8±0.9± 0.4)×10-2, A(Dpi0)K*=+0.77±0.35±0.12, R(Dgamma)K*=(1.3±1.4±0.8)×10-2,A(Dgamma)K*=+0.36 ±0.94-0.41+0.25, where the first uncertainty is statistical and the second is systematic. We use a frequentist approach to obtain the magnitude of the ratio rB≡|A(B--->D[over-bar] 0K-)/A(B--->D0K-)|=(9.5-4.1+5.1)%, with rB<16.7% at 90% confidence level. In the case of B--->D*K- we find rB*≡|A(B--->D[over-bar] *0K-)/A(B--->D*0K-)|=(9.6-5.1+3.5)%, with rB*<15.0% at 90% confidence level. Alfred P. Sloan Foundation United States-Israel Binational Science Foundation United States. Dept. of Energy National Science Foundation (U.S.) 2011-02-25T20:21:16Z 2011-02-25T20:21:16Z 2010-10 2010-06 Article http://purl.org/eprint/type/JournalArticle 1550-7998 1550-2368 http://hdl.handle.net/1721.1/61346 The BABAR Collaboration et al. “Search for b-->u transitions in B^{-}-->DK^{-} and D^{*}K^{-} decays.” Physical Review D 82.7 (2010): 072006. © 2010 The American Physical Society. https://orcid.org/0000-0002-8667-5660 en_US http://dx.doi.org/10.1103/PhysRevD.82.072006 Physical Review D Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Sciolla, Gabriella Zhao, M. Dujmic, Denis Fisher, Peter H Cowan, Ray F Search for b-->u transitions in B--->DK- and D*K- decays |
| title | Search for b-->u transitions in B--->DK- and D*K- decays |
| title_full | Search for b-->u transitions in B--->DK- and D*K- decays |
| title_fullStr | Search for b-->u transitions in B--->DK- and D*K- decays |
| title_full_unstemmed | Search for b-->u transitions in B--->DK- and D*K- decays |
| title_short | Search for b-->u transitions in B--->DK- and D*K- decays |
| title_sort | search for b u transitions in b dk and d k decays |
| url | http://hdl.handle.net/1721.1/61346 https://orcid.org/0000-0002-8667-5660 |
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