SU(3) breaking effects in charmed meson decays

Abstract

The decay rates of D + → π + π 0 and D 0 → K + π − recently measured by CLEO give the ratios R 1 = 2|V cs /V cd | 2 Γ(D + → π + π 0 )/Γ(D + →K 0 π + ) = 3.29 ± 1.16 and R 2 =2.92 ± 1.34 . Both are about three times of those expected from SU(3) symmetry. We show that, in the large-N c factorization approach, such large SU(3) violations can be accounted for by the accumulations of several small SU(3)-breaking effects. An important requirement is the relative magnitude of the form factors, f Dπ + (0) > f DK + (0).

Extraction ofa1anda2fromB→ψK(Cheng1, Tseng2 1995Phys. Rev. DSelf Cite351350View full textAdd to dashboardCite

“…Recall that a global fit of the BSWII model to the data yields a 2 /a 1 = 0.23 ± 0.11 [1]. Our result (27) thus improves the previous error analysis by a factor of two. We also remark that the fraction of longitudinal polarization inB 0 → D * + ρ − is measured to be 0.93 ± 0.05 ± 0.05 [1].…”

SU(3)F breaking through final state interactions and CP asymmetries in <

“…which is compatible with the measured value. Various other estimates of δ Kπ can be found in [79,[123][124][125][126].…”

D0 → K±π∓ and CP violation at a τ-charm factory

“…To t the CLEO II result for D 0 ! K 6 7 , which gives j K j 2 = (0:77 6 0:25 6 0:25)% [15], one nds K 5 0 0 13 0 from a few phenomenological models [16]. For illustration, we show the time dependence of +0 C (T ) in Fig.…”