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 RID A-8798-2012 RID C-5223-2009 RID C-5719-2008 RID D-1055-2009 RID A-2675-2009
LUSIANI, Alberto;
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.).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
