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Measurement of D^0-D(overbar)^(0) Mixing Parameters Using D^0 → K_(S)^(0)π^(+)π^(-) and D^0 → K_(S)^(0)K^(+)K^(-) Decays

del Amo Sanchez, P. and Cheng, C. H. and Doll, D. A. and Echenard, B. and Hitlin, D. G. and Ongmongkolkul, P. and Porter, F. C. and Rakitin, A. Y. (2010) Measurement of D^0-D(overbar)^(0) Mixing Parameters Using D^0 → K_(S)^(0)π^(+)π^(-) and D^0 → K_(S)^(0)K^(+)K^(-) Decays. Physical Review Letters, 105 (8). 081803. ISSN 0031-9007.

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We report a direct measurement of D^0-D(overbar)^0 mixing parameters through a time-dependent amplitude analysis of the Dalitz plots of D^0 → K_(S)^(0)π^(+)π^(-) and, for the first time, D^0 → K_(S)^(0)K^(+)K^(-) decays. The low-momentum pion π^(+)_s in the decay D^(*+)→D^(0)π^(+)_s identifies the flavor of the neutral D meson at its production. Using 468.5 fb^(-1) of e^(+)e^(-) colliding-beam data recorded near √s=10.6  GeV by the BABAR detector at the PEP-II asymmetric-energy collider at SLAC, we measure the mixing parameters x=[1.6±2.3(stat)±1.2(syst)±0.8(model)]×10^(-3), and y=[5.7±2.0(stat)±1.3(syst)±0.7(model)]×10^(-3). These results provide the best measurement to date of x and y. The knowledge of the value of x, in particular, is crucial for understanding the origin of mixing.

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Additional Information:© 2010 American Physical Society. Received 28 April 2010; published 19 August 2010. We are grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues, and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (U.S.), NSERC (Canada), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MICIIN (Spain), STFC (U.K.). Individuals have received support from the Marie Curie EIF (European Union), the A. P. Sloan Foundation (U.S.) and the Binational Science Foundation (U.S.-Israel).
Funding AgencyGrant Number
Department of EnergyUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
CEA (Commissariat à l'Energie Atomique), FranceUNSPECIFIED
CNRS-IN2P3 (Centre National de la Recherche Scientifique), FranceUNSPECIFIED
BMBF (Bundesministerium für Bildung und Forschung), GermanyUNSPECIFIED
DFG (Deutsche Forschungsgemeinschaft), GermanyUNSPECIFIED
INFN (Istituto Nazionale di Fisica Nucleare), ItalyUNSPECIFIED
FOM (Fundamenteel Onderzoek der Materie), The NetherlandsUNSPECIFIED
NFR (Forskningsrådets), NorwayUNSPECIFIED
MICIIN (Ministerio de Ciencia e Innovación), SpainUNSPECIFIED
STFC (Science and Technology Facilities Council), UKUNSPECIFIED
Marie Curie EIF (European Union)UNSPECIFIED
A. P. Sloan FoundationUNSPECIFIED
Binational Science Foundation (USA-Israel)UNSPECIFIED
Issue or Number:8
Classification Code:PACS: 13.25.Ft, 11.30.Er, 12.15.Ff, 14.40.Lb
Record Number:CaltechAUTHORS:20100914-112940642
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:19948
Deposited By: Jason Perez
Deposited On:17 Sep 2010 01:21
Last Modified:03 Oct 2019 02:03

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