Improved Measurement of B[superscript +]-->rho[superscript +]rho[superscript 0] and Determination of the Quark-Mixing Phase Angle alpha
We present improved measurements of the branching fraction B, the longitudinal polarization fraction fL, and the direct CP asymmetry ACP in the B meson decay channel B+-->ρ+ρ0. The data sample was collected with the BABAR detector at SLAC. The results are B(B+-->ρ+ρ0)=(23.7±1.4±1.4)×10-6, fL=...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2010
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| Online Access: | http://hdl.handle.net/1721.1/54806 https://orcid.org/0000-0002-8667-5660 |
| _version_ | 1826211646978129920 |
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| author | Cowan, Ray Franklin Dujmic, Denis Henderson, Shawn Wesley Sciolla, Gabriella Spitznagel, M. Yamamoto, R. K. Zhao, M. Fisher, Peter H. |
| author2 | Massachusetts Institute of Technology. Laboratory for Nuclear Science |
| author_facet | Massachusetts Institute of Technology. Laboratory for Nuclear Science Cowan, Ray Franklin Dujmic, Denis Henderson, Shawn Wesley Sciolla, Gabriella Spitznagel, M. Yamamoto, R. K. Zhao, M. Fisher, Peter H. |
| author_sort | Cowan, Ray Franklin |
| collection | MIT |
| description | We present improved measurements of the branching fraction B, the longitudinal polarization fraction fL, and the direct CP asymmetry ACP in the B meson decay channel B+-->ρ+ρ0. The data sample was collected with the BABAR detector at SLAC. The results are B(B+-->ρ+ρ0)=(23.7±1.4±1.4)×10-6, fL=0.950±0.015±0.006, and ACP=-0.054±0.055±0.010, where the uncertainties are statistical and systematic, respectively. Based on these results, we perform an isospin analysis and determine the Cabibbo-Kobayashi-Maskawa phase angle α=arg(-VtdVtb*/VudVub*) to be (92.4-6.5+6.0)°. |
| first_indexed | 2024-09-23T15:09:18Z |
| format | Article |
| id | mit-1721.1/54806 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:09:18Z |
| publishDate | 2010 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/548062024-06-26T20:53:31Z Improved Measurement of B[superscript +]-->rho[superscript +]rho[superscript 0] and Determination of the Quark-Mixing Phase Angle alpha Improved Measurement of B+→ρ+ρ0 and Determination of the Quark-Mixing Phase Angle α Cowan, Ray Franklin Dujmic, Denis Henderson, Shawn Wesley Sciolla, Gabriella Spitznagel, M. Yamamoto, R. K. Zhao, M. Fisher, Peter H. Massachusetts Institute of Technology. Laboratory for Nuclear Science Fisher, Peter H. Cowan, Ray Franklin Dujmic, Denis Henderson, Shawn Wesley Sciolla, Gabriella Spitznagel, M. Yamamoto, R. K. Zhao, M. Fisher, Peter H. We present improved measurements of the branching fraction B, the longitudinal polarization fraction fL, and the direct CP asymmetry ACP in the B meson decay channel B+-->ρ+ρ0. The data sample was collected with the BABAR detector at SLAC. The results are B(B+-->ρ+ρ0)=(23.7±1.4±1.4)×10-6, fL=0.950±0.015±0.006, and ACP=-0.054±0.055±0.010, where the uncertainties are statistical and systematic, respectively. Based on these results, we perform an isospin analysis and determine the Cabibbo-Kobayashi-Maskawa phase angle α=arg(-VtdVtb*/VudVub*) to be (92.4-6.5+6.0)°. Science and Technology Facilities Council, United Kingdom MEC (Spain) Ministry of Education and Science of the Russian Federation Norges forskningsråd FOM of the Netherlands Deutsche Forschungsgemeinschaft Bundesministerium für Bildung und Forschung, Germany Institut National de Physique Nucleaire et Physique des Particules/CNRS Istituto Nazionale di Fisica Nucleare of Italy Commissariat à l'Energie Atomique (France) Natural Sciences and Engineering Research Council of Canada National Science Foundation United States Department of Energy 2010-05-18T21:17:23Z 2010-05-18T21:17:23Z 2009-04 2009-01 Article http://purl.org/eprint/type/JournalArticle 0031-9007 http://hdl.handle.net/1721.1/54806 BABAR Collaboration et al. “Improved Measurement of B+--> rho[superscript +]rho[superscript 0] and Determination of the Quark-Mixing Phase Angle alpha.” Physical Review Letters 102.14 (2009): 141802. © 2009 American Physical Society. https://orcid.org/0000-0002-8667-5660 en_US http://dx.doi.org/10.1103/PhysRevLett.102.141802 Physical Review Letters 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 | Cowan, Ray Franklin Dujmic, Denis Henderson, Shawn Wesley Sciolla, Gabriella Spitznagel, M. Yamamoto, R. K. Zhao, M. Fisher, Peter H. Improved Measurement of B[superscript +]-->rho[superscript +]rho[superscript 0] and Determination of the Quark-Mixing Phase Angle alpha |
| title | Improved Measurement of B[superscript +]-->rho[superscript +]rho[superscript 0] and Determination of the Quark-Mixing Phase Angle alpha |
| title_full | Improved Measurement of B[superscript +]-->rho[superscript +]rho[superscript 0] and Determination of the Quark-Mixing Phase Angle alpha |
| title_fullStr | Improved Measurement of B[superscript +]-->rho[superscript +]rho[superscript 0] and Determination of the Quark-Mixing Phase Angle alpha |
| title_full_unstemmed | Improved Measurement of B[superscript +]-->rho[superscript +]rho[superscript 0] and Determination of the Quark-Mixing Phase Angle alpha |
| title_short | Improved Measurement of B[superscript +]-->rho[superscript +]rho[superscript 0] and Determination of the Quark-Mixing Phase Angle alpha |
| title_sort | improved measurement of b superscript rho superscript rho superscript 0 and determination of the quark mixing phase angle alpha |
| url | http://hdl.handle.net/1721.1/54806 https://orcid.org/0000-0002-8667-5660 |
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