Evidence for CP violation in B0 ---> D+D- decays - INSPIRE

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Evidence for CP violation in B0 ---> D+D- decays

Belle

Collaboration

•

S. Fratina

Feb, 2007

12 pages

Published in:

Phys.Rev.Lett. 98 (2007) 221802

e-Print:

hep-ex/0702031 [hep-ex]

DOI:

10.1103/PhysRevLett.98.221802

PDG:

{{\mathit B}^{0}}

\rightarrow

{{\mathit D}^{-}}{{\mathit D}^{+}}

Report number:

BELLE-PREPRINT-2007-11,
KEK-PREPRINT-2006-75

Experiments:

KEK-BF-BELLE

View in:

ADS Abstract Service

reference search59 citations

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Abstract:

We report measurements of the branching fraction and CP violation parameters in B0 -> D+D- decays. The results are based on a data sample that contains 535 x 10^6 BBbar pairs collected at the Upsilon(4S) resonance, with the Belle detector at the KEKB asymmetric-energy e+e- collider. We obtain [1.97 +- 0.20 (stat) +- 0.20 (syst)] x 10^(-4) for the branching fraction of B0 -> D+D-. The measured values of the CP violation parameters are: S = -1.13 +- 0.37 +- 0.09, A = 0.91 +- 0.23 +- 0.06, where the first error is statistical and the second is systematic. We find evidence of CP violation in B0 -> D+D- at the 4.1 sigma confidence level. While the value of S is consistent with expectations from other measurements, the value of the parameter A favors large direct CP violation at the 3.2 sigma confidence level, in contradiction to Standard Model expectations.

11.30.Er
13.25.Hw
electron positron: colliding beams
electron positron: annihilation
Upsilon(10570): electroproduction
B: pair production
B0: hadronic decay
D: pair production
D: hadronic decay
B0: branching ratio

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Figures(0)

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