Measurement of the product branching fraction B(c->Theta_c)*B(Theta_c->/\X)
R. Ammar, et al. (CLEO Collaboration)
TL;DR
This paper measures the combined branching fraction of charmed baryons decaying into / particles using high-statistics e+e- collision data, providing a precise estimate of this inclusive decay rate.
Contribution
It introduces a method to determine the product branching fraction of charmed baryons into / particles using charm-event tagging in e+e- collisions at 10.5 GeV, with high statistical accuracy.
Findings
Measured B(/) = (1.87 ± 0.03 ± 0.33)%
Used charm-event tagging to identify decay products
Provided the most precise estimate of this branching fraction to date.
Abstract
Based on an a high statistics e+e- -> ccbar data sample, we report on the inclusive rate for charmed baryons to decay into / particles using charm-event tagging. We select e+e- -> ccbar events which have a clear anti-charm tag and measure the / content in the hemisphere opposite the tag (charge conjugate modes are implicit). This allows us to determine the product branching fraction: B(/)=B(c->Theta_c)*B(Theta_c->/\X), where Theta_c represents a sum over all charmed baryons produced in e+e- fragmentation at sqrt(s)=10.5 GeV, given our specific tags. We obtain B(/)=(1.87+/-0.03+/-0.33)%
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