Observation of D+ â K(+)η(') and search for CP violation in D+ â π(+)η(') decays.
Phys Rev Lett
; 107(22): 221801, 2011 Nov 25.
Article
em En
| MEDLINE
| ID: mdl-22182020
ABSTRACT
We report the first observation of the doubly Cabibbo-suppressed decays D(+)âK(+)η((')) 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(+)âπ(+)η((')) decays are B(D(+)âK(+)η)/B(D(+)âπ(+)η)=(3.06±0.43±0.14)% and B(D(+)âK(+)η')/B(D(+)âπ(+)η')=(3.77±0.39±0.10)%. From these, we find that the relative final-state phase difference between the tree and annihilation amplitudes in D(+) decays, δ(TA), is (72±9)° or (288±9)°. We also report the most precise measurements of CP asymmetries to date A(CP)(D(+)âπ(+)η)=(+1.74±1.13±0.19)% and A(CP)(D(+)âπ(+)η')=(-0.12±1.12±0.17)%.
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Phys Rev Lett
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2011
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