Constraint on CKM angle {phi}2 from B decays

Journal Article · Tue Jul 11 04:00:00 EDT 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2220372· OSTI ID:20875816

Kusaka, A ^[1]

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1. Department of Physics, University of Tokyo, 7-3-1, Hongou, Bunkyou-ku, Tokyo (Japan)

We report a measurement of CKM angle {phi}2 with the decay modes B0 {yields} {pi}+{pi}- and B0 {yields} {rho}+{rho}-. The results are obtained from a 253fb-1 data sample containing 275 million BB(bar sign) pairs collected by the Belle detector at KEKB asymmetric energy e+e- collider operating at the {upsilon}(4S) resonance. We measure the CP-violating parameters: A{pi}{pi} +0.56 0.12(stat.) 0.06(syst.) and S{pi}{pi} = -0.67 0.16(stat.) 0.06(syst.) for B0 {yields} {pi}+{pi}-, and A{sub {rho}}{sub {rho}}{sup L} =0.00 0.30(stat.) 0.08(syst.) and S{sub {rho}}{sub {rho}}{sup L} = +0.08 0.41 (stat.) 0.08(syst.) for B0 {yields} {rho}+{rho}-. Using an isospin analysis, we obtain the model independent constraint on CKM angle {phi}2 from the CP asymmetry measurements. Combining the constraints from the two decay modes, we obtain {phi}{sub 2} = 93{sub -11}{sup +12deg.} as a central value and 1{sigma} error, and 76 deg. < {phi}2 < 113 deg. as a 90% confidence interval.

• OSTI ID: 20875816
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 842; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
B NEUTRAL MESONS
CP INVARIANCE
ELECTRON-POSITRON INTERACTIONS
ERRORS
HADRONIC PARTICLE DECAY
ISOSPIN
KOBAYASHI-MASKAWA MATRIX
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PARTICLE PRODUCTION
PIONS MINUS
PIONS PLUS
RESONANCE PARTICLES
RHO-770 MESONS
UPSILON-10580 MESONS
WEINBERG ANGLE