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Enhanced effects on extracting γfrom untagged B^0 and B_s decays

Michael Gronau·Yuval Grossman·Ze'ev Surujon·Jure Zupan
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Abstract

The weak phase γcan be determined using untagged B^0\to DK_S or B_s\to Dϕ, Dη^{(')} decays. In the past, the small lifetime difference y\equiv ΔΓ/(2Γ) has been neglected in B^0, while the CP violating parameter ε\equiv 1-|q/p|^2 has been neglected in both B^0-\bar B^0 and B_s-\bar B_s mixing. We estimate the effect of neglecting y and ε. We find that in D decays to flavor states this introduces a systematic error, which is enhanced by a large ratio of Cabibbo-allowed to doubly Cabibbo-suppressed D decay amplitudes.

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Michael Gronau, Yuval Grossman, Ze'ev Surujon, Jure Zupan. 2007-02-11. Enhanced effects on extracting γfrom untagged B^0 and B_s decays. https://doi.org/10.1016/j.physletb.2007.03.057

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