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B^\pm -> D K^\pm with direct CP violation in charm · Around

2012

B^\pm -> D K^\pm with direct CP violation in charm

Martone, Mario, Zupan, Jure

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We investigate the implications of direct CP violation (CPV) on the determination of the unitarity triangle angle \gamma\ from B -> DK decays.

We show that \gamma\ can still be extracted even with the inclusion of direct CPV in charm if (i) at least one of the D decays has negligible CP violation; and (ii) data from charm factory at threshold are used.
If approximate expressions without including direct CP violation in charm are used, this can result in a shift in \gamma\ that is O(r_D/r_B).
It is modest for B -> DK but can be O(1) for B -> D\pi.

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