Measurement of CP asymmetries and branching fractions in charmless two-body B-meson decays to pions and kaons
We present improved measurements of CP-violation parameters in the decays B[superscript 0]-->π+π-, B[superscript 0]-->K+π-, and B[superscript 0]-->π[superscript 0]π[superscript 0], and of the branching fractions for B[superscript 0]-->π[superscript 0]π[superscript 0] and B[superscript 0]...
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2013
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| Online Access: | http://hdl.handle.net/1721.1/82606 |
| _version_ | 1826204660358184960 |
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| author | Dujmic, Denis Sciolla, Gabriella Cowan, Ray F |
| author2 | Massachusetts Institute of Technology. Laboratory for Nuclear Science |
| author_facet | Massachusetts Institute of Technology. Laboratory for Nuclear Science Dujmic, Denis Sciolla, Gabriella Cowan, Ray F |
| author_sort | Dujmic, Denis |
| collection | MIT |
| description | We present improved measurements of CP-violation parameters in the decays B[superscript 0]-->π+π-, B[superscript 0]-->K+π-, and B[superscript 0]-->π[superscript 0]π[superscript 0], and of the branching fractions for B[superscript 0]-->π[superscript 0]π[superscript 0] and B[superscript 0]-->K[superscript 0]π[superscript 0]. The results are obtained with the full data set collected at the Υ(4S) resonance by the BABAR experiment at the PEP-II asymmetric-energy B factory at the SLAC National Accelerator Laboratory, corresponding to (467±5)×10[superscript 6] BB̅ pairs. We find the CP-violation parameter values and branching fractions: Sπ+π-=-0.68±0.10±0.03, Cπ+π-=-0.25±0.08±0.02, AK-π+=-0.107±0.016[subscript -0.004][superscript +0.006], Cπ0π0=-0.43±0.26±0.05, B(B0-->π0π0)=(1.83±0.21±0.13)×10-6, B(B[superscript 0]-->K[superscript 0]π[superscript 0])= (10.1±0.6±0.4)×10-6, where in each case, the first uncertainties are statistical and the second are systematic. We observe CP violation with a significance of 6.7 standard deviations for B[superscript 0]-->π+π- and 6.1 standard deviations for B0-->K+π-, including systematic uncertainties. Constraints on the unitarity triangle angle α are determined from the isospin relations among the B-->ππ rates and asymmetries. Considering only the solution preferred by the Standard Model, we find α to be in the range [71°,109°] at the 68% confidence level. |
| first_indexed | 2024-09-23T12:58:38Z |
| format | Article |
| id | mit-1721.1/82606 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:58:38Z |
| publishDate | 2013 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/826062023-02-26T09:59:31Z Measurement of CP asymmetries and branching fractions in charmless two-body B-meson decays to pions and kaons Dujmic, Denis Sciolla, Gabriella Cowan, Ray F Massachusetts Institute of Technology. Laboratory for Nuclear Science Cowan, Ray Franklin Dujmic, Denis Sciolla, Gabriella We present improved measurements of CP-violation parameters in the decays B[superscript 0]-->π+π-, B[superscript 0]-->K+π-, and B[superscript 0]-->π[superscript 0]π[superscript 0], and of the branching fractions for B[superscript 0]-->π[superscript 0]π[superscript 0] and B[superscript 0]-->K[superscript 0]π[superscript 0]. The results are obtained with the full data set collected at the Υ(4S) resonance by the BABAR experiment at the PEP-II asymmetric-energy B factory at the SLAC National Accelerator Laboratory, corresponding to (467±5)×10[superscript 6] BB̅ pairs. We find the CP-violation parameter values and branching fractions: Sπ+π-=-0.68±0.10±0.03, Cπ+π-=-0.25±0.08±0.02, AK-π+=-0.107±0.016[subscript -0.004][superscript +0.006], Cπ0π0=-0.43±0.26±0.05, B(B0-->π0π0)=(1.83±0.21±0.13)×10-6, B(B[superscript 0]-->K[superscript 0]π[superscript 0])= (10.1±0.6±0.4)×10-6, where in each case, the first uncertainties are statistical and the second are systematic. We observe CP violation with a significance of 6.7 standard deviations for B[superscript 0]-->π+π- and 6.1 standard deviations for B0-->K+π-, including systematic uncertainties. Constraints on the unitarity triangle angle α are determined from the isospin relations among the B-->ππ rates and asymmetries. Considering only the solution preferred by the Standard Model, we find α to be in the range [71°,109°] at the 68% confidence level. National Science Foundation (U.S.) Alfred P. Sloan Foundation United States. Dept. of Energy 2013-11-27T16:24:39Z 2013-11-27T16:24:39Z 2013-03 2012-06 Article http://purl.org/eprint/type/JournalArticle 1550-7998 1550-2368 http://hdl.handle.net/1721.1/82606 Lees, J. P., V. Poireau, V. Tisserand, J. Garra Tico, E. Grauges, A. Palano, G. Eigen, et al. "Measurement of CP Asymmetries and Branching Fractions in Charmless Two-body B-meson Decays to Pions and Kaons." Physical Review D 87, no. 5 (March 2013). © 2013 American Physical Society. en_US http://dx.doi.org/10.1103/PhysRevD.87.052009 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 | Dujmic, Denis Sciolla, Gabriella Cowan, Ray F Measurement of CP asymmetries and branching fractions in charmless two-body B-meson decays to pions and kaons |
| title | Measurement of CP asymmetries and branching fractions in charmless two-body B-meson decays to pions and kaons |
| title_full | Measurement of CP asymmetries and branching fractions in charmless two-body B-meson decays to pions and kaons |
| title_fullStr | Measurement of CP asymmetries and branching fractions in charmless two-body B-meson decays to pions and kaons |
| title_full_unstemmed | Measurement of CP asymmetries and branching fractions in charmless two-body B-meson decays to pions and kaons |
| title_short | Measurement of CP asymmetries and branching fractions in charmless two-body B-meson decays to pions and kaons |
| title_sort | measurement of cp asymmetries and branching fractions in charmless two body b meson decays to pions and kaons |
| url | http://hdl.handle.net/1721.1/82606 |
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