Updated Measurement of the Strong Phase in D0 --> K+pi- Decay Using Quantum Correlations in e+e- --> D0 D0bar at CLEO
Abstract
We analyze a sample of 3 million quantum-correlated D0 D0bar pairs from 818 pb^-1 of e+e- collision data collected with the CLEO-c detector at E_cm = 3.77 GeV, to give an updated measurement of \cos\delta and a first determination of \sin\delta, where \delta is the relative strong phase between doubly Cabibbo-suppressed D0 --> K+pi- and Cabibbo-favored D0bar --> K+pi- decay amplitudes. With no inputs from other experiments, we find \cos\delta = 0.81 +0.22+0.07 -0.18-0.05, \sin\delta = -0.01 +- 0.41 +- 0.04, and |\delta| = 10 +28+13 -53-0 degrees. By including external measurements of mixing parameters, we find alternative values of \cos\delta = 1.15 +0.19+0.00 -0.17-0.08, \sin\delta = 0.56 +0.32+0.21 -0.31-0.20, and \delta = (18 +11-17) degrees. Our results can be used to improve the world average uncertainty on the mixing parameter y by approximately 10%.
Cite
@article{arxiv.1210.0939,
title = {Updated Measurement of the Strong Phase in D0 --> K+pi- Decay Using Quantum Correlations in e+e- --> D0 D0bar at CLEO},
author = {CLEO Collaboration and D. M. Asner and G. Tatishvili and J. Y. Ge and D. H. Miller and I. P. J. Shipsey and B. Xin and G. S. Adams and J. Napolitano and K. M. Ecklund and Q. He and J. Insler and H. Muramatsu and L. J. Pearson and E. H. Thorndike and M. Artuso and S. Blusk and N. Horwitz and R. Mountain and T. Skwarnicki and S. Stone and J. C. Wang and L. M. Zhang and P. U. E. Onyisi and G. Bonvicini and D. Cinabro and A. Lincoln and M. J. Smith and P. Zhou and P. Naik and J. Rademacker and K. W. Edwards and E. J. White and R. A. Briere and H. Vogel and P. U. E. Onyisi and J. L. Rosner and J. P. Alexander and D. G. Cassel and S. Das and R. Ehrlich and L. Gibbons and S. W. Gray and D. L. Hartill and D. L. Kreinick and V. E. Kuznetsov and J. R. Patterson and D. Peterson and D. Riley and A. Ryd and A. J. Sadoff and X. Shi and S. Stroiney and W. M. Sun and J. Yelton and P. Rubin and N. Lowrey and S. Mehrabyan and M. Selen and J. Wiss and J. Libby and M. Kornicer and R. E. Mitchell and D. Besson and T. K. Pedlar and D. Cronin-Hennessy and J. Hietala and S. Dobbs and Z. Metreveli and K. K. Seth and A. Tomaradze and T. Xiao and A. Powell and C. Thomas and G. Wilkinson},
journal= {arXiv preprint arXiv:1210.0939},
year = {2015}
}
Comments
Minor revisions, version accepted by PRD