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Title: Measurements of direct CP asymmetries in B → Xsγ decays using sum of exclusive decays
Author: Graugés Pous, Eugeni
BABAR Collaboration
Keywords: Física de partícules
Particle physics
Issue Date: 5-Nov-2014
Publisher: American Physical Society
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.
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It is part of: Physical Review D, 2014, vol. 90, num. 9, p. 092001
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ISSN: 1550-7998
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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