Study of the doubly and singly Cabibbo suppressed decays D+ → K+π+π− and D+s→K+π+π−

Cabibbo-allowed and Doubly Cabibbo Suppressed D → Kπ Decays

For over two decades, the D → Kπ has served as a workhorse in charm and beauty physics. However, there is general interest in measuring all the D → Kπ branching fractions. In particular, while it is often assumed that B(D → K Sπ) = B(D → K Lπ), interference between D → Kπ and D → K0π can break this equality. Although this asymmetry is expected, measuring it has alluded experiments because of th...

Study of the doubly and singly Cabibbo suppressed decays D + → K + π + π − and D + s → K + π + π −

Using data collected by the high energy photoproduction experiment FOCUS at Fermilab we study the doubly and singly Cabibbo suppressed decays D and D s → K ππ. Our measurements of Γ(D → Kππ)/Γ(D → Kππ) = 0.0065 ± 0.0008 ± 0.0004 and Γ(D s → K ππ)/ Γ(D s → K Kπ) = 0.127 ± 0.007± 0.014 are based on samples of 189± 24 D and 567± 31 D s reconstructed events, respectively. We also present Dalitz plo...

New Physics Effects in Doubly Cabibbo Suppressed D Decays

The most sensitive experimental searches for D0–D̄0 mixing use D0 → K+π− decays. It is often assumed that effects of New Physics and, in particular, CP violation, can appear through the mixing, while the c → dus̄ decay amplitude cannot have significant contributions from New Physics and is, therefore, CP conserving to a good approximation. We examine this assumption in two ways. First, we calcula...

Singly Cabibbo Suppressed Charm Decays : CP Violation and Amplitude Analysis

D Mixing and Cabibbo Suppressed Decays

The CLEO collaboration reported observation of the ‘wrong sign’ decay D → Kπ in 1993. Upgrades have been made to the CLEO detector , including installation of a silicon vertex detector, which provide substantial improvements in sensitivity to D→Kπ. The vertex detector enables the reconstruction of the proper lifetime of the D, and so provides sensitivity to D−D mixing. We will give preliminary ...