Results on mixing in the D0 System from BaBar

by Monika Grothe (CERN-EP)

Monday 14 Jan 2002, 16:30 → 17:30 Europe/Zurich

500/1-001 - Main Auditorium (CERN)

Mixing in the D⁰ system may provide a sensitive probe for new physics beyond the Standard Model (SM). The SM predictions are small (<10^-3) for the mixing parameters x, y which, in the absence of CP-violation, measure the mass (x = DM/G) and lifetime (y = DG/2G) difference of the CP-eigenstates in the D⁰ system. New physics may significantly enhance x while y is expected to be dominated by SM processes. The BaBar detector at the e⁺e^- storage ring PEP-II provides the opportunity of studying charm decays with unprecedented statistics and purities. Two experimental methods will be described in detail: The determination of y from the D⁰ lifetime difference in the decays K^-p⁺ and K^-K⁺ , and the extraction of y, x² and the wrong-sign (D⁰ -> K⁺p^-) decay rate from the time evolution of the D⁰ decay rate. Preliminary BaBar results for y and the wrong-sign decay rate will be presented.

Organiser(s): Ariane Frey / EP Division

Note: Tea & coffee will be served at 16.00 hrs.