Observation of direct CP violation in the measurement of the Cabibbo-Kobayashi-Maskawa angle gamma with B+- --> D(*)K(*)+- decays
J. -P. Lees
(1)
,
V. Poireau
(1)
,
V. Tisserand
(1)
,
D. Bernard
(2)
,
M. Verderi
(2)
,
N. Arnaud
(3)
,
M. Davier
(3)
,
D. Derkach
(3)
,
G. Grosdidier
(3)
,
F. Le Diberder
(3)
,
A.M. Lutz
(3)
,
B. Malaescu
(3)
,
P. Roudeau
(3)
,
M.H. Schune
(3)
,
A. Stocchi
(3)
,
G. Wormser
(3)
,
S. Akar
(4)
,
E. Ben-Haim
(4)
,
M. Bomben
(4)
,
G.R. Bonneaud
(4)
,
H. Briand
(4)
,
G. Calderini
(4)
,
J. Chauveau
(4)
,
O. Hamon
(4)
,
Ph. Leruste
(4)
,
G. Marchiori
(4)
,
J. Ocariz
(4)
,
S. Sitt
(4)
N. Arnaud
- Fonction : Auteur
- PersonId : 16841
- IdHAL : nicolas-arnaud
- ORCID : 0000-0001-6589-8673
G. Calderini
- Fonction : Auteur
- PersonId : 10608
- IdHAL : giovanni-calderini
- ORCID : 0000-0002-9495-9145
- IdRef : 172243211
G. Marchiori
- Fonction : Auteur
- PersonId : 741274
- IdHAL : giovanni-marchiori
- ORCID : 0000-0003-2655-7643
- IdRef : 180997203
Résumé
We report the determination of the Cabibbo-Kobayashi-Maskawa CP-violating angle gamma through the combination of various measurements involving B^{+-} --> D K^{+-}, B^{+-} --> D^{*} K^{+-}, and B^{+-} --> D K^{*+-} decays performed by the BaBar experiment at the PEP-II e^{+}e^{-} collider at SLAC National Accelerator Laboratory. Using up to 474 million B\bar{B} pairs, we obtain gamma = (69 ^{+17}_{-16})^\circ (modulo 180^\circ). The total uncertainty is dominated by the statistical component, with the experimental and amplitude-model systematic uncertainties amounting to +-4^\circ. The corresponding two-standard-deviation region is 41^\circ < gamma < 102^\circ. This result is inconsistent with gamma = 0 with a significance of 5.9 standard deviations.