A measurement of lifetime differences in the neutral D-meson system
The FOCUS Collaboration
TL;DR
This paper measures the lifetime differences in neutral D mesons to explore D0-D0bar mixing, using high-statistics photoproduction data from the FOCUS experiment at Fermilab.
Contribution
It provides the first measurement of the parameter yCP in the D0 system using photoproduction data, contributing to understanding charm meson mixing phenomena.
Findings
Measured yCP = 0.0342 ± 0.0139 ± 0.0074
Supports the presence of lifetime differences in D0 decays
Provides data relevant for charm mixing phenomenology
Abstract
Using a high statistics sample of photoproduced charm particles from the FOCUS experiment at Fermilab, we compare the lifetimes of neutral D mesons decaying via D0 to K- pi+ and K- K+ to measure the lifetime differences between CP even and CP odd final states. These measurements bear on the phenomenology of D0 - D0bar mixing. If the D0 to K-pi+ is an equal mixture of CP even and CP odd eigenstates, we measure yCP = 0.0342 \pm 0.0139 \pm 0.0074.
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