천병구
2018-02-14T04:19:26Z
2018-02-14T04:19:26Z
2011-11
Physical Review Letters, NOV 21 2011, 107 22
0031-9007
http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.107.221801
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)%.
We thank the KEKB group for excellent operation of the accelerator, the KEK cryogenics group for efficient solenoid operations, and the KEK computer group and the NII for valuable computing and SINET4 network support. We acknowledge support from MEXT, JSPS and Nagoya's TLPRC (Japan); ARC and DIISR (Australia); NSFC (China); MSMT (Czechia); DST (India); MEST, NRF, NSDC of KISTI, and WCU (Korea); MNiSW (Poland); MES and RFAAE (Russia); ARRS (Slovenia); SNSF (Switzerland); NSC and MOE (Taiwan); and DOE (USA). E. Won acknowledges support by NRF Grant No. 2011-0027652 and B. R. Ko acknowledges support by NRF Grant No. 2011-0025750.
en
AMER Physical SOC
BELLE
Observation of D+ -˃ K+eta(()'()) and Search for CP Violation in D+ -˃ pi(+)eta(()'()) Decays
Article
22
107
1-6
PHYSICAL REVIEW LETTERS
Won, Eunil
Aihara, Hiroaki
Nitoh, Osamu
Kim, Sun Kee
Pakhlov, Pavel
Uglov, Timofey
Danilov, Mikhail
Mizuk, Roman
Chilikin, Kirill
Cheon, B. G.
2011207605
S
COLLEGE OF NATURAL SCIENCES[S]
DEPARTMENT OF PHYSICS
bgcheon