Bounding hadronic uncertainties inc→udecays

Abstract

Time-dependent CP asymmetry measurements in D → h + h − decays, where h = π or ρ can be used to constrain the angle βc of the cu unitarity triangle up to theoretical uncertainties. Here we discuss the theoretical uncertainty from penguin contributions that can be mitigated through the use of isospin analyses. We show that uncertainty from penguin pollution on a measurement of βc (or alternatively the mixing phase) in• (4.6 • ). We also comment on the applicability of this method to D 0 → ρπ decays for which measurements of weak phases with a precision below the one degree level may be possible.

CP Asymmetries in Many-Body Final in Beauty & Charm Transitions

“…Hadronic uncertainties in c =⇒ u decays are discussed in Ref. [53], in particular about D 0 → π + π − , ρ + ρ − , ρπ. I am somewhat disagree with some of their statements or at least their choice of words, namely 'tree' (T ), 'W -exchanges' (E) and three 'penguin' amplitudes (P d,s,b ).…”

“Could charm (& τ) transitions be the ‘poor princess’ providing a deeper understanding of fundamental dynamics ?” or: “Finding novel forces”

“…Hadronic uncertainties in c → u decays have been discussed [97], in particular as regards 20) . I disagree with some of the statements in this paper.…”