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Evidence for direct CP violation in the measurement of the Cabbibo-Kobayashi-Maskawa angle gamma with B--/+ -> D-(*K-)(()*()-/+) decays

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Collaboration, B (Including:

Sanchez, P. del Amo, Lees, J. P., Poireau, V., Prencipe, E., Tisserand, V., Tico, J. Garra, Grauges, E., Martinelli, M., Palano, A., Pappagallo, M. et al.
). (2010) Evidence for direct CP violation in the measurement of the Cabbibo-Kobayashi-Maskawa angle gamma with B--/+ -> D-(*K-)(()*()-/+) decays. Physical Review Letters, Vol.105 (No.12). article no. 121801 . ISSN 0031-9007

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Abstract

We report the measurement of the Cabibbo-Kobayashi-Maskawa CP-violating angle gamma through a Dalitz plot analysis of neutral D-meson decays to K-S(0)pi(+) pi(-) and K-S(0) K+ K- produced in the processes B--/+ -> DK -/+, B--/+ -> D* K--/+ with D* -> D pi(0), D gamma and B -/+ DK*-/+ with K*(-/+) -> K-S(0)pi(-/+), using 468 million B (B) over bar pairs collected by the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) collider at SLAC. We measure gamma = (68 +/- 14 +/- 4 +/- 3)degrees (modulo 180 degrees), where the first error is statistical, the second is the experimental systematic uncertainty, and the third reflects the uncertainty in the description of the neutral D decay amplitudes. This result is inconsistent with gamma = 0 ( no direct CP violation) with a significance of 3.5 standard deviations.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Journal or Publication Title: Physical Review Letters
Publisher: American Physical Society
ISSN: 0031-9007
Date: 16 September 2010
Volume: Vol.105
Number: No.12
Number of Pages: 7
Page Range: article no. 121801
Identification Number: 10.1103/PhysRevLett.105.121801
Status: Peer Reviewed
Publication Status: Published
URI: http://wrap.warwick.ac.uk/id/eprint/5127

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