Mixing in the D⁰ system at BaBar

by Dr. Monika Grothe (CERN)

Wednesday 5 Jun 2002, 17:00 → 18:00 Europe/Zurich

UNIVERSITE DE GENEVE Stückelberg Auditorium

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 difference in mass (x = DeltaMass/gamma) and lifetime (y = DeltaGamma/2Gamma) 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^—pi⁺ and K^—K⁺, pi^—pi⁺, and the extraction of y, x² and the wrong-sign (D⁰ -> K⁺pi^—) 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): E. Cortina-Gil

Note: UNIVERSITE DE GENEVE Ecole de physique Département de physique nucléaire et corspusculaire 24, Quai Ernest-Ansermet 1211 GENEVE 4 TéL: (022) 702 62 73 Fax: (022) 781 21 92

more information more information