BABAR Collaboration (Including: Harrison, P. F., Ilić, Jelena, Latham, Thomas and Mohanty, G. B.). (2008) Measurement of D-0-(D)over-bar(0) mixing using the ratio of lifetimes for the decays D-0 -> K-pi(+), K-K+, and pi(-)pi(+). Physical Review D (Particles, Fields, Gravitation and Cosmology), Volume 78 (Number 1). Article No. 011105. doi:10.1103/PhysRevD.78.011105

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Abstract

We present a measurement of D-0-(D) over bar (0) mixing parameters using the ratios of lifetimes extracted from a sample of D-0 mesons produced through the process D*+ -> D-0 pi(+), which decay to K-pi(+), K-K+, or pi(-)pi(+). The lifetimes of the CP-even, Cabibbo-suppressed modes K-K+ and pi(-)pi(+) are compared with that of the CP-mixed, Cabibbo-favored mode K-pi(+) to obtain a measurement of y(CP), which in the limit of CP conservation corresponds to the mixing parameter y. The analysis is based on a data sample of 384 fb(-1) collected by the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) collider. We obtain y(CP) = [1.24 +/- 0.39(stat) +/- 0.13(syst)]%, which is evidence for D-0-(D) over bar (0) mixing at the 3 sigma level, and Delta Y = [-0.26 +/- 0.36(stat) +/- 0.08(syst)]%, where Delta Y constrains possible CP violation. Combining this result with a previous BABAR measurement of y(CP) obtained from a separate sample of D-0 -> K-K+ events, we obtain y(CP) = [1.03 +/- 0.33(stat) +/- 0.19(syst)]%.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Radioactive decay, CP violation (Nuclear physics)
Journal or Publication Title:	Physical Review D (Particles, Fields, Gravitation and Cosmology)
Publisher:	American Physical Society
ISSN:	1550-7998
Official Date:	July 2008
Dates:	Date Event July 2008 Published
Volume:	Volume 78
Number:	Number 1
Number of Pages:	9
Page Range:	Article No. 011105
DOI:	10.1103/PhysRevD.78.011105
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	United States. Dept. of Energy, National Science Foundation (U.S.) (NSF), Natural Sciences and Engineering Research Council of Canada (NSERC), Institut national de physique nucléaire et de physique des particules (IN2P3), France. Commissariat à l'énergie atomique (CEA), Germany. Bundesministerium für Bildung und Forschung (BMBF), Deutsche Forschungsgemeinschaft (DFG), Istituto nazionale di fisica nucleare (INFN), Stichting voor Fundamenteel Onderzoek der Materie (FOM) [Foundation for Fundamental Research on Matter], Norges forskningsråd [Norwegian Research Council] , Ministry of Education and Science of the Russian Federation (MESRF), Spain. Ministerio de Educación y Ciencia (MEC), Science and Technology Facilities Council (Great Britain) (STFC), Marie Curie Intra-European Fellowship (IEF), Alfred P. Sloan Foundation

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