Measurement of CP Asymmetry in a Time-Dependent Dalitz Analysis of B^0 \to (\rho \pi)^0 and a Constraint on the Quark Mixing Matrix Angle \phi_2

C. C. Wang; et al; H. Ishino; The Belle Collaboration: A. Kusaka

arxiv: hep-ex/0701015 · v2 · submitted 2007-01-10 · ✦ hep-ex

Measurement of CP Asymmetry in a Time-Dependent Dalitz Analysis of B⁰ to (rho π)⁰ and a Constraint on the Quark Mixing Matrix Angle φ₂

The Belle Collaboration: A. Kusaka , C. C. Wang , H. Ishino , et al This is my paper

classification ✦ hep-ex

keywords analysisdalitzangleasymmetryconstraintdatameasurementtime-dependent

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We present a measurement of CP asymmetry using a time-dependent Dalitz plot analysis of B0 --> pi+pi-pi0 decays based on a 414/fb data sample containing 449M BB pairs. The data was collected on the $\Upsilon$(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. Combining our analysis with information on charged B decay modes, we perform a full Dalitz and isospin analysis and obtain a constraint on the CKM angle $\phi_2$, 68 deg. < $\phi_2$ < 95 deg. as the 68.3% confidence interval for the $\phi_2$ solution consistent with the standard model (SM). A large SM-disfavored region also remains.

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Method to study $CP$ violation in $B_s^0\to K_S K^\pm \pi^\mp$ decays
hep-ph 2026-06 unverdicted novelty 7.0

A method is developed to relate amplitudes for B_s^0 → K_S K* resonances in the two final states, enabling the first tagged decay-time-dependent Dalitz analysis to measure the effective weak phase φ_s^eff.