Measurement of $\gamma$ in $B^\mp \to D^{(*)} K^\mp$ decays with a Dalitz analysis of $D \to K^0_S \pi^- \pi^+$

We report on a measurement of the Cabibbo-Kobayashi-Maskawa CP-violating phase gamma through a Dalitz analysis of neutral D decays to K0s pi- pi+ in the processes B-+ -> D(*)K-+, D* -> D pi0, D gamma. Using a sample of 227 million BBbar pairs collected by the BaBar detector, we measure the amplitude ratios rB = 0.12+/-0.08+/-0.03+/-0.04 and rB* = 0.17+/-0.10+/-0.03+/-0.03, the relative strong phases deltaB = 104+/-45+17-21+16-24, and deltaB*= -64+/-41+14-12+/-15 between the amplitudes A(B- -> Dbar(*)0 K-) and A(B- -> D(*)0 K-), and gamma = 70+/-31+12-10+14-11. The first error is statistical, the second is the experimental systematic uncertainty and the third reflects the Dalitz model uncertainty. The results for the strong and weak phases have a two-fold ambiguity.

13.25.Ft
11.30.Er
13.25.Hw
12.15.Ff
B mesons
meson hadronic decay
CP invariance
D mesons
electromagnetic decays
electron positron: colliding beams

References(19)

Figures(0)

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