Author:
Adolph Nico,Brod Joachim,Hiller Gudrun
Abstract
AbstractWe study radiative charm decays $$D \rightarrow P_1 P_2 \gamma $$
D
→
P
1
P
2
γ
, $$P_{1,2}=\pi ,K$$
P
1
,
2
=
π
,
K
in QCD factorization at leading order and within heavy hadron chiral perturbation theory. Branching ratios including resonance contributions are around $$\sim 10^{-3}$$
∼
10
-
3
for the Cabibbo-favored modes into $$K \pi \gamma $$
K
π
γ
and $$\sim 10^{-5}$$
∼
10
-
5
for the singly Cabibbo-suppressed modes into $$\pi ^+ \pi ^- \gamma , K^+ K^- \gamma $$
π
+
π
-
γ
,
K
+
K
-
γ
, and thus in reach of the flavor factories BES III and Belle II. Dalitz plots and forward–backward asymmetries reveal significant differences between the two QCD frameworks; such observables are therefore ideally suited for a data-driven identification of relevant decay mechanisms in the standard-model dominated $$D \rightarrow K \pi \gamma $$
D
→
K
π
γ
decays. This increases the potential to probe new physics with the $$D \rightarrow \pi ^+ \pi ^- \gamma $$
D
→
π
+
π
-
γ
and $$D \rightarrow K^+ K^- \gamma $$
D
→
K
+
K
-
γ
decays, which are sensitive to enhanced dipole operators. CP asymmetries are useful to test the SM and look for new physics in neutral $$|\Delta C|=1$$
|
Δ
C
|
=
1
transitions. Cuts in the Dalitz plot enhance the sensitivity to new physics due to the presence of both s- and t, u-channel intermediate resonances.
Funder
Deutscher Akademischer Austauschdienst
Publisher
Springer Science and Business Media LLC
Subject
Physics and Astronomy (miscellaneous),Engineering (miscellaneous)
Cited by
4 articles.
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