Time Dependent CP Violation in B0→ π+π- Decays

Details Time Dependent CP Violation in B0→ π+π- Decays Time Dependent CP Violation in B0→ π+π- Decays

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006fuin.conf..159h&link_type=abstract

FUNDAMENTAL INTERACTIONS. Proceedings of the 20th Lake Louise Winter Institute. Held 20-26 February 2005 in Lake Louise, Alberta

Physics

Scientific paper

We present a new measurement of the time-dependent CP-violating parameters in B0→ π+π- decays with 275 × 106 B /line{B} pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. We find 666±43 B0 → π+π- events and obtain the CP-violating parameters {S}π π = -0.67 ± 0.16(stat) ± 0.06(syst) and {A}π π = +0.56 ± 0.12(stat) ± 0.06(syst). Large direct CP-violation is observed with a significance greater than 4 standard deviations for any {S}π π value. Using isospin relations, we obtain 95.4% confidence intervals for the CKM angle ϕ2 of 0° < ϕ2 < 19° and 71° < ϕ2 < 180°.

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