Observation of $D^+ \rightarrow K^{+} \eta^{(\prime)}$ and Search for CP Violation in $D^+ \rightarrow \pi^+ \eta^{(\prime)}$ Decays

Won, E.; Ko, B.R.; Adachi, I.; Aihara, H.; Arinstein, K.; Asner, D.M.; Aushev, T.; Bakich, A.M.; Barberio, E.; Bay, A.

doi:10.1103/PhysRevLett.107.221801

Observation of $D^+ \rightarrow K^{+} \eta^{(\prime)}$ and Search for CP Violation in $D^+ \rightarrow \pi^+ \eta^{(\prime)}$ Decays

Belle

Collaboration

Jul, 2011

6 pages

Published in:

Phys.Rev.Lett. 107 (2011) 221801

e-Print:

1107.0553 [hep-ex]

DOI:

10.1103/PhysRevLett.107.221801

PDG:

{{\mathit D}^{+}}

\rightarrow

{{\mathit K}^{+}}{{\mathit \eta}}

Experiments:

KEK-BF-BELLE

View in:

pdf

reference search30 citations

Citations per year

Abstract: (arXiv)

We report the first observation of the doubly Cabibbo-suppressed decays

D^+ \rightarrow K^+ \eta^{(\prime)}

using a 791 fb

^{-1}

data sample collected with the Belle detector at the KEKB asymmetric-energy

e^+e^-

collider. The ratio of the branching fractions of doubly Cabibbo-suppressed relative to singly Cabibbo-suppressed

D^+ \rightarrow \pi^+ \eta^{(\prime)}

decays are

\mathcal{B}(D^+ \rightarrow K^+ \eta)/\mathcal{B}(D^+ \rightarrow \pi^+ \eta)

= (3.06

\pm

0.43

\pm

0.14)% and

\mathcal{B}(D^+ \rightarrow K^+ \eta')/\mathcal{B}(D^+ \rightarrow \pi^+ \eta')

= (3.77

\pm

0.39

\pm

0.10)%. From these, we find that the relative final-state phase difference between the tree and annihilation amplitudes in

D^+

decays,

\delta_{TA}

, is (72

\pm

9)

^\circ

or (288

\pm

9)

^\circ

. We also report the most precise measurements of CP asymmetries to date:

A_{CP}^{D^+ \rightarrow \pi^+ \eta}

= (+1.74

\pm

1.13

\pm

0.19)% and

A_{CP}^{D^+ \rightarrow \pi^+ \eta'}

= (

-

0.12

\pm

1.12

\pm

0.17)%.

Note:

6 pages, 2 figures, 3 tables. Published in PRL

11.30.Hv
11.30.Er
13.25.Ft
14.40.Lb
CP: violation
CP: asymmetry: measured
D+: branching ratio: ratio
eta(958)
BELLE
KEK-B

References(15)

Figures(8)

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Observation of D+→K+η(′)D^+ \rightarrow K^{+} \eta^{(\prime)}D+→K+η(′) and Search for CP Violation in D+→π+η(′)D^+ \rightarrow \pi^+ \eta^{(\prime)}D+→π+η(′) Decays

Citations per year

Observation of $D^+ \rightarrow K^{+} \eta^{(\prime)}$ and Search for CP Violation in $D^+ \rightarrow \pi^+ \eta^{(\prime)}$ Decays