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Observation of D+ -> K+eta(()'()) and Search for CP Violation in D+ -> pi(+)eta(()'()) Decays

Olivier Schneider, Yiming Li, Aurelio Bay, Mingkui Wang, Chao Wang, Tagir Aushev, Sun Hee Kim, Jun Yong Kim, Remi Léandre Albert Louvot, Ji Hyun Kim, Jing Li
2011
Journal paper
Abstract

We report the first observation of the doubly Cabibbo-suppressed decays D+ -> K+eta(()'()) 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+ -> pi(+)eta(()'()) decays are B(D+ -> K+eta) / B(D+ -> pi(+)eta) =(3.06 +/- 0.43 +/- 0.14)% and B(D+ -> K+eta')/B(D+->pi(+)eta') = (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, delta(TA), is (72 +/- 9)degrees or (288 +/- 9)degrees. We also report the most precise measurements of CP asymmetries to date: A(CP)(D+->pi+eta) = (+1.74 +/- 1.13 +/- 0.19)% and A(CP)(D+->pi+eta') = (-0.12 +/- 1.12 +/- 0.17)%.

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