Measurement of D{sup 0}-D{sup 0} mixing using the ratio of lifetimes for the decays D{sup 0}{yields}K{sup -}{pi}{sup +}, K{sup -}K{sup +}, and {pi}{sup -}{pi}{sup +}
- Laboratoire de Physique des Particules, IN2P3/CNRS et Universite de Savoie, F-74941 Annecy-Le-Vieux (France)
- Universitat de Barcelona, Facultat de Fisica, Departament ECM, E-08028 Barcelona (Spain)
- Universita di Bari, Dipartimento di Fisica and INFN, I-70126 Bari (Italy)
- University of Bergen, Institute of Physics, N-5007 Bergen (Norway)
- Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720 (United States)
We present a measurement of D{sup 0}-D{sup 0} mixing parameters using the ratios of lifetimes extracted from a sample of D{sup 0} mesons produced through the process D*{sup +}{yields}D{sup 0}{pi}{sup +}, which decay to K{sup -}{pi}{sup +}, K{sup -}K{sup +}, or {pi}{sup -}{pi}{sup +}. The lifetimes of the CP-even, Cabibbo-suppressed modes K{sup -}K{sup +} and {pi}{sup -}{pi}{sup +} are compared with that of the CP-mixed, Cabibbo-favored mode K{sup -}{pi}{sup +} to obtain a measurement of y{sub 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{sup -1} collected by the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider. We obtain y{sub CP}=[1.24{+-}0.39(stat){+-}0.13(syst)]%, which is evidence for D{sup 0}-D{sup 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{sub CP} obtained from a separate sample of D{sup 0}{yields}K{sup -}K{sup +} events, we obtain y{sub CP}=[1.03{+-}0.33(stat){+-}0.19(syst)]%.
- OSTI ID:
- 21250180
- Journal Information:
- Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 1 Vol. 78; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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