•Want to precisely connect
•What we can measure, e.g., E(y,f) in the
detector
•To
•What we can calculate,
e.g., arising from small numbers of partons as functions of E, y,f
•Issues: Uncertainties in pdf’s
• Higher orders in perturbation theory
• Non-perturbative hadronization (&
showering)
• Details (especially differences between
groups) of algorithms
& kinematics
•