Measurement of the Time-Dependent CP Asymmetry of Partially Reconstructed B0->D*+D*- 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
- Function : Author
- PersonId : 16841
- IdHAL : nicolas-arnaud
- ORCID : 0000-0001-6589-8673
M. Bomben
- Function : Author
- PersonId : 1380362
- ORCID : 0000-0002-9807-861X
- IdRef : 242005462
G. Calderini
- Function : Author
- PersonId : 10608
- IdHAL : giovanni-calderini
- ORCID : 0000-0002-9495-9145
- IdRef : 172243211
G. Marchiori
- Function : Author
- PersonId : 741274
- IdHAL : giovanni-marchiori
- ORCID : 0000-0003-2655-7643
- IdRef : 180997203
Abstract
We present a new measurement of the time-dependent CP asymmetry of B0->D*+D*- decays using (471+-5) million BBbar pairs collected with the BaBar detector at the PEP-II B Factory at the SLAC National Accelerator Laboratory. Using the technique of partial reconstruction, we measure the time-dependent CP asymmetry parameters S=-0.34+-0.12+-0.05$ and C=+0.15+-0.09+-0.04. Using the value for the CP-odd fraction R_perp=0.158+-0.028+-0.006, previously measured by BaBar with fully reconstructed B0->D*+D*- events, we extract the CP-even components S+=-0.49+-0.18+-0.07+-0.04 and C+=+0.15+-0.09+-0.04. In each case, the first uncertainty is statistical and the second is systematic; the third uncertainty on S+ is the contribution from the uncertainty on R_perp. The measured value of the CP-even component S+ is consistent with the value of sin(2Beta) measured in b->(ccbar)s transitions, and with the Standard Model expectation of small penguin contributions.