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Search for b-->u transitions in B- --> DK- and B- --> D*K- Decays · Around

2010

Search for b-->u transitions in B- --> DK- and B- --> D*K- Decays

The BABAR Collaboration, al., P. del Amo Sanchez et

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We report results from an updated study of the suppressed decays B- to D K- and B- to D* K- followed by D to K+pi-, where D(*) indicates a D(*)0 or an anti-D(*)0 meson, and D* decays to D pi0 or D gamma.

These decays are sensitive to the CKM unitarity triangle angle gamma, due to interference between the b to c transition B- to D(*)0K- followed by the doubly Cabibbo-suppressed decay D0 to K+pi-, and the b to u transition B- to anti-D(*)0K- followed by the Cabibbo-favored decay anti-D0 to K+pi-.
We also report an analysis of the decay B- to D(*)pi- with the D decaying into the doubly Cabibbo-suppressed mode D to K+pi-.
Our results are based on 467 million Upsilon (4S) to B anti-B decays collected with the BaBar detector at SLAC.

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The function is 𝒜 ⁡ ( m E S ) ∝ m E S 1 − x 2 exp ⁡ [ − ζ ⁡ ( 1 − x 2 ) ] {\cal A}(m_{ES})\propto m_{ES}\sqrt{1-x^{2}}\exp[-\zeta(1-x^{2})] , where x = 2 m E S / m 0 x=2m_{ES}/m_{0} ; H. Albrecht et al
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