Journal article
Measurements of direct CP asymmetries in B →xsγ decays using sum of exclusive decays
Physical review. D, Particles, fields, gravitation, and cosmology, Vol.90(9), 092001
11/05/2014
DOI: 10.1103/PhysRevD.90.092001
Abstract
We measure the direct C P violation asymmetry, A C P , in B → X s γ and the isospin difference of the asymmetry, Δ A C P , using 429 fb − 1 of data collected at Υ ( 4 S ) resonance with the BABAR detector at the PEP-II asymmetric-energy e + e − storage rings operating at the SLAC National Accelerator Laboratory. B mesons are reconstructed from ten charged B final states and six neutral B final states. We find A C P = + ( 1.7 ± 1.9 ± 1.0 ) % , which is in agreement with the Standard Model prediction and provides an improvement on the world average. Moreover, we report the first measurement of the difference between A C P for charged and neutral decay modes, Δ A C P = + ( 5.0 ± 3.9 ± 1.5 ) % . Using the value of Δ A C P , we also provide 68% and 90% confidence intervals on the imaginary part of the ratio of the Wilson coefficients corresponding to the chromomagnetic dipole and the electromagnetic dipole transitions.
Details
- Title: Subtitle
- Measurements of direct CP asymmetries in B →xsγ decays using sum of exclusive decays
- Creators
- Eugeni Graugés PousBaBar Collaboration
- Contributors
- U Mallik (Contributor) - University of Iowa, Physics and Astronomy
- Resource Type
- Journal article
- Publication Details
- Physical review. D, Particles, fields, gravitation, and cosmology, Vol.90(9), 092001
- DOI
- 10.1103/PhysRevD.90.092001
- ISSN
- 1550-7998
- eISSN
- 1550-2368
- Publisher
- American Physical Society
- Grant note
- DOI: 10.13039/100000015, name: U.S. Department of Energy; DOI: 10.13039/100000001, name: National Science Foundation
- Language
- English
- Date published
- 11/05/2014
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199735202771
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