Based on an 87-fb(-1) data set collected by the BABAR detector at the PEP-II asymmetric-energy B Factory, a search for D-0-(D) over bar (0) mixing has been made using the semileptonic decay modes D*+-->pi(+)D(0), D-0-->K((*))enu (+c.c.). The use of these modes allows unambiguous flavor tagging and a combined fit of the D-0 decay time and D*+-D-0 mass difference (DeltaM) distributions. The high-statistics sample of unmixed semileptonic D-0 decays is used to model the DeltaM distribution and time dependence of mixed events directly from the data. Neural networks are used to select events and reconstruct the D-0. A result consistent with no charm mixing has been obtained, R-mix=0.0023+/-0.0012+/-0.0004. This corresponds to an upper limit of R-mix<0.0042 (90% C.L.).

Search for D-0-(D)over-bar(0) mixing using semileptonic decay modes

FERRONI, Fernando
2004

Abstract

Based on an 87-fb(-1) data set collected by the BABAR detector at the PEP-II asymmetric-energy B Factory, a search for D-0-(D) over bar (0) mixing has been made using the semileptonic decay modes D*+-->pi(+)D(0), D-0-->K((*))enu (+c.c.). The use of these modes allows unambiguous flavor tagging and a combined fit of the D-0 decay time and D*+-D-0 mass difference (DeltaM) distributions. The high-statistics sample of unmixed semileptonic D-0 decays is used to model the DeltaM distribution and time dependence of mixed events directly from the data. Neural networks are used to select events and reconstruct the D-0. A result consistent with no charm mixing has been obtained, R-mix=0.0023+/-0.0012+/-0.0004. This corresponds to an upper limit of R-mix<0.0042 (90% C.L.).
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12571/1922
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