We report on an improved measurement of the Cabibbo-Kobayashi-Maskawa CP-violating phase γ through a Dalitz plot analysis of neutral D meson decays to KS0π+π- and KS0K+K- produced in the processes B →DK, B →D*K with D*→Dπ0, Dγ, and B →DK* with K* →KS0π. Using a sample of 383×106 BB̄ pairs collected by the BABAR detector, we measure γ=(76±22±5±5)° (mod 180°), where the first error is statistical, the second is the experimental systematic uncertainty, and the third reflects the uncertainty on the description of the Dalitz plot distributions. The corresponding 2-standard-deviation region is 29°<122°. This result has a significance of direct CP violation (γ ≠0) of 3.0 standard deviations.

Aubert, B., Bona, M., Karyotakis, Y., Lees, J., Poireau, V., Prencipe, E., et al. (2008). Improved measurement of the CKM angle γ in B →d(*) K(*) decays with a Dalitz plot analysis of D decays to KS0π+π- and KS0K+K-. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 78(3) [10.1103/PhysRevD.78.034023].

Improved measurement of the CKM angle γ in B →d(*) K(*) decays with a Dalitz plot analysis of D decays to KS0π+π- and KS0K+K-

CARPINELLI, Massimo;
2008

Abstract

We report on an improved measurement of the Cabibbo-Kobayashi-Maskawa CP-violating phase γ through a Dalitz plot analysis of neutral D meson decays to KS0π+π- and KS0K+K- produced in the processes B →DK, B →D*K with D*→Dπ0, Dγ, and B →DK* with K* →KS0π. Using a sample of 383×106 BB̄ pairs collected by the BABAR detector, we measure γ=(76±22±5±5)° (mod 180°), where the first error is statistical, the second is the experimental systematic uncertainty, and the third reflects the uncertainty on the description of the Dalitz plot distributions. The corresponding 2-standard-deviation region is 29°<122°. This result has a significance of direct CP violation (γ ≠0) of 3.0 standard deviations.
Articolo in rivista - Articolo scientifico
BABAR detector
English
B. Aubert et al. (BABAR Collaboration)
Aubert, B., Bona, M., Karyotakis, Y., Lees, J., Poireau, V., Prencipe, E., et al. (2008). Improved measurement of the CKM angle γ in B →d(*) K(*) decays with a Dalitz plot analysis of D decays to KS0π+π- and KS0K+K-. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 78(3) [10.1103/PhysRevD.78.034023].
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