Measurement of branching fractions and search for CP violation in D0 → π+π−η, D0 → K+K−η, and D0 → ϕη at Belle
branching fraction
e+-e− Experiments
BELLE
Branching fraction; Charm physics; CP violation; e; +; -e; −; Experiments
QC770-798
electron positron: annihilation
+
D0: hadronic decay
eta
pi+
530
01 natural sciences
pi-
High Energy Physics - Experiment
D0 --> pi+ pi- eta
KEK-B
e+-e��� Experiments
D0 --> K+ K- eta
Nuclear and particle physics. Atomic energy. Radioactivity
D0 --> Phi(1020) eta
0103 physical sciences
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
CP: violation
D0 --> pi+ pi- eta
info:eu-repo/classification/ddc/530
charm physics
Charm physics
-e
Physics
Phi(1020)
ddc:530
−
500
e +-e − Experiments
electron positron: colliding beams
e(+)-e(-) experiments
D0 --> Phi(1020) eta
asymmetry: CP
e
D0: branching ratio: measured
CP violation
identification
D0 --> K+ K- eta
Branching fraction
Experiments
experimental results
DOI:
10.1007/jhep09(2021)075
Publication Date:
2021-09-20T10:14:59Z
AUTHORS (190)
ABSTRACT
Abstract
We measure the branching fractions and CP asymmetries for the singly Cabibbo-suppressed decays D0 → π+π−η, D0 → K+K−η, and D0 → ϕη, using 980 fb−1 of data from the Belle experiment at the KEKB e+e− collider. We obtain$$ {\displaystyle \begin{array}{c}\mathcal{B}\left({D}^0\to {\pi}^{+}{\pi}^{-}\eta \right)=\left[1.22\pm 0.02\left(\mathrm{stat}\right)\pm 0.02\left(\mathrm{syst}\right)\pm 0.03\left({\mathcal{B}}_{\mathrm{ref}}\right)\right]\times {10}^{-3},\\ {}\mathcal{B}\left({D}^0\to {K}^{+}{K}^{-}\eta \right)=\left[{1.80}_{-0.06}^{+0.07}\left(\mathrm{stat}\right)\pm 0.04\left(\mathrm{syst}\right)\pm 0.05\left({\mathcal{B}}_{\mathrm{ref}}\right)\right]\times {10}^{-4},\\ {}\mathcal{B}\left({D}^0\to \phi \eta \right)=\left[1.84\pm 0.09\left(\mathrm{stat}\right)\pm 0.06\left(\mathrm{syst}\right)\pm 0.05\left({\mathcal{B}}_{\mathrm{ref}}\right)\right]\times {10}^{-4},\end{array}} $$
B
D
0
→
π
+
π
−
η
=
1.22
±
0.02
stat
±
0.02
syst
±
0.03
B
ref
×
10
−
3
,
B
D
0
→
K
+
K
−
η
=
1.80
−
0.06
+
0.07
stat
±
0.04
syst
±
0.05
B
ref
×
10
−
4
,
B
D
0
→
ϕη
=
1.84
±
0.09
stat
±
0.06
syst
±
0.05
B
ref
×
10
−
4
,
where the third uncertainty ($$ \mathcal{B} $$
B
ref) is from the uncertainty in the branching fraction of the reference mode D0 → K−π+η. The color-suppressed decay D0 → ϕη is observed for the first time, with very high significance. The results for the CP asymmetries are$$ {\displaystyle \begin{array}{c}{A}_{CP}\left({D}^0\ {\pi}^{+}{\pi}^{-}\eta \right)=\left[0.9\pm 1.2\left(\mathrm{stat}\right)\pm 0.5\left(\mathrm{syst}\right)\right]\%,\\ {}{A}_{CP}\left({D}^0\to {K}^{+}{K}^{-}\eta \right)=\left[-1.4\pm 3.3\left(\mathrm{stat}\right)\pm 1.1\left(\mathrm{syst}\right)\right]\%,\\ {} ACP\ \left({D}^0\to \phi \eta \right)=\left[-1.9\pm 4.4\left(\mathrm{stat}\right)\pm 0.6\left(\mathrm{syst}\right)\right]\%.\end{array}} $$
A
CP
D
0
π
+
π
−
η
=
0.9
±
1.2
stat
±
0.5
syst
%
,
A
CP
D
0
→
K
+
K
−
η
=
−
1.4
±
3.3
stat
±
1.1
syst
%
,
ACP
D
0
→
ϕη
=
−
1.9
±
4.4
stat
±
0.6
syst
%
.
The results for D0 → π+π−η are a significant improvement over previous results. The branching fraction and ACP results for D0 → K+K−η, and the ACP result for D0 → ϕη, are the first such measurements. No evidence for CP violation is found in any of these decays.
SUPPLEMENTAL MATERIAL
Coming soon ....
REFERENCES (26)
CITATIONS (2)
EXTERNAL LINKS
PlumX Metrics
RECOMMENDATIONS
FAIR ASSESSMENT
Coming soon ....
JUPYTER LAB
Coming soon ....