Measurement of time-dependent CP asymmetries in B0 → D(*)±π± decays and constraints on sin(2β + γ)

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doi:10.1103/PhysRevLett.92.251801

The CP-violating asymmetries in fully reconstructed B0 → D(*)∓π∓ decays and constraints on sin(2β + γ) were investigated. The time evolution of decays was sensitive to γ because of interference between the Cabibbo-Kobayashi-Maskawa (CKM) favored decay and doubly CKM-suppressed decay. The consistency of data was computed with given value of sin(2β + γ) by counting fraction of simulated experiments for which χ 2(sin(2β + γ))-χmin2 was smaller. The lower limit on |sin(2β + γ)| was observed at 68% confidence level which drops from 0.69 to 0.60.

Aubert, B., Barate, R., Boutigny, D., Gaillard, J., Hicheur, A., Karyotakis, Y., et al. (2004). Measurement of time-dependent CP asymmetries in B0 → D(*)±π± decays and constraints on sin(2β + γ). PHYSICAL REVIEW LETTERS, 92(25), 1-7 [10.1103/PhysRevLett.92.251801].