Studies of the decays D0→KS0K<sup>-</sup>π<sup>+</sup> and D0→KS0K<sup>+</sup>π<sup>-</sup>

Date Issued
29-05-2012
Author(s)
Insler, J.
Muramatsu, H.
Park, C. S.
Pearson, L. J.
Thorndike, E. H.
Ricciardi, S.
Thomas, C.
Artuso, M.
Blusk, S.
Mountain, R.
Skwarnicki, T.
Stone, S.
Wang, J. C.
Zhang, L. M.
Bonvicini, G.
Cinabro, D.
Smith, M. J.
Zhou, P.
Gershon, T.
Naik, P.
Rademacker, J.
Edwards, K. W.
Randrianarivony, K.
Briere, R. A.
Vogel, H.
Onyisi, P. U.E.
Rosner, J. L.
Alexander, J. P.
Cassel, D. G.
Das, S.
Ehrlich, R.
Gibbons, L.
Gray, S. W.
Hartill, D. L.
Kreinick, D. L.
Kuznetsov, V. E.
Patterson, J. R.
Peterson, D.
Riley, D.
Ryd, A.
Sadoff, A. J.
Shi, X.
Sun, W. M.
Yelton, J.
Rubin, P.
Lowrey, N.
Mehrabyan, S.
Selen, M.
Wiss, J.
Indian Institute of Technology, Madras
Kornicer, M.
Mitchell, R. E.
Besson, D.
Pedlar, T. K.
Cronin-Hennessy, D.
Hietala, J.
Dobbs, S.
Metreveli, Z.
Seth, K. K.
Tomaradze, A.
Xiao, T.
Johnson, D.
Malde, S.
Martin, L.
Powell, A.
Wilkinson, G.
Asner, D. M.
Tatishvili, G.
Ge, J. Y.
Miller, D. H.
Shipsey, I. P.J.
Xin, B.
Adams, G. S.
Napolitano, J.
Ecklund, K. M.
DOI
Abstract
The first measurements of the coherence factor RKS0Kπ and the average strong-phase difference δDKS0Kπ in D0→KS0K ∓π± decays are reported. These parameters can be used to improve the determination of the unitary triangle angle γ in B-→D∼K- decays, where D∼ is either a D0 or a D̄0 meson decaying to the same final state, and also in studies of charm mixing. The measurements of the coherence factor and strong-phase difference are made using quantum-correlated, fully reconstructed D0D̄0 pairs produced in e+e- collisions at the ψ(3770) resonance. The measured values are RKS0Kπ=0. 73±0.08 and δDKS0Kπ=(8.3±15.2)° for an unrestricted kinematic region and RK*K=1.00±0.16 and δDK *K=(26.5±15.8)° for a region where the combined KS0π± invariant mass is within 100MeV/c2 of the K *(892)± mass. These results indicate a significant level of coherence in the decay. In addition, isobar models are presented for the two decays, which show the dominance of the K *(892)± resonance. The branching ratio B(D0→KS0K+π-)/B(D0→KS0K -π+) is determined to be 0.592±0.044(stat) ±0.018(syst), which is more precise than previous measurements. © 2012 American Physical Society.
Volume
85