Determination of the D{sup 0}{yields}K{sup -}{pi}{sup +}{pi}{sup 0} and D{sup 0}{yields}K{sup -}{pi}{sup +}{pi}{sup +}{pi}{sup -} coherence factors and average strong-phase differences using quantum-correlated measurements

Journal Article · Sat Aug 01 00:00:00 EDT 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.80.031105· OSTI ID:21322312

Lowrey, N; Mehrabyan, S; Selen, M; Wiss, J ^[1]; Mitchell, R E; Shepherd, M R ^[2]; Besson, D ^[3]; Pedlar, T K ^[4]; Cronin-Hennessy, D; Gao, K Y; Hietala, J; Kubota, Y; Klein, T; Poling, R; Scott, A W; Zweber, P ^[5]; Dobbs, S; Metreveli, Z; Seth, K K; Tan, B J. Y. ^[6]

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1. University of Illinois, Urbana-Champaign, Illinois 61801 (United States)
2. Indiana University, Bloomington, Indiana 47405 (United States)
3. University of Kansas, Lawrence, Kansas 66045 (United States)
4. Luther College, Decorah, Iowa 52101 (United States)
5. University of Minnesota, Minneapolis, Minnesota 55455 (United States)
6. Northwestern University, Evanston, Illinois 60208 (United States)

The first measurements of the coherence factors (R{sub K{pi}}{sub {pi}{sup 0}} and R{sub K3{pi}}) and the average strong-phase differences ({delta}{sub D}{sup K{pi}}{sup {pi}{sup 0}} and {delta}{sub D}{sup K3{pi}}) for D{sup 0}{yields}K{sup -}{pi}{sup +}{pi}{sup 0} and D{sup 0}{yields}K{sup -}{pi}{sup +}{pi}{sup +}{pi}{sup -} are presented. These parameters can be used to improve the determination of the unitarity triangle angle {gamma} in B{sup -}{yields}DK{sup -} decays, where D is a D{sup 0} or D{sup 0} meson decaying to the same final state. The measurements are made using quantum-correlated, fully reconstructed D{sup 0}D{sup 0} pairs produced in e{sup +}e{sup -} collisions at the {psi}(3770) resonance. The measured values are: R{sub K{pi}}{sub {pi}{sup 0}}=0.84{+-}0.07, {delta}{sub D}{sup K{pi}}{sup {pi}{sup 0}}=(227{sub -17}{sup +14}) deg., R{sub K3{pi}}=0.33{sub -0.23}{sup +0.20}, and {delta}{sub D}{sup K3{pi}}=(114{sub -23}{sup +26}) deg. These results indicate significant coherence in the decay D{sup 0}{yields}K{sup -}{pi}{sup +}{pi}{sup 0}, whereas lower coherence is observed in the decay D{sup 0}{yields}K{sup -}{pi}{sup +}{pi}{sup +}{pi}{sup -}. The analysis also results in a small improvement in the knowledge of other D-meson parameters, in particular, the strong-phase difference for D{sup 0}{yields}K{sup -}{pi}{sup +}, {delta}{sub D}{sup K{pi}}, and the mixing parameter y.

• OSTI ID: 21322312
• Journal Information: Physical Review. D, Particles Fields, Vol. 80, Issue 3; Other Information: DOI: 10.1103/PhysRevD.80.031105; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B MINUS MESONS
D MESONS
D NEUTRAL MESONS
ELECTRON-POSITRON COLLISIONS
KAONS MINUS
MIXING
PAIR PRODUCTION
PARTICLE DECAY
PIONS MINUS
PIONS NEUTRAL
PIONS PLUS
PSI-3770 MESONS
RESONANCE
UNITARITY