P. Surko

Drift Chamber System for a High Rate Experiment

A system of 19 large drift chambers has been built and used in an experiment in the FNAL muon beam. The design of the chambers and electronics enabled the system to perform with incident particle rates of up to 107 per second.

Open and hidden charm muoproduction

New results are presented on open and hidden charm and bottom production by 209‐GeV muons interacting in a magnetized steel calorimeter. The upper limit on the production of T states by muons is σ(μN→TX)B(T→μμ)<22×10−39 cm2 (90% confidence level). The distributions of elastically produced ψ’s are consistent with s‐channel helicity conservation (SCHC) and disagree with ψ dominance. From analysis of dimuon final states the cross section for diffractive charm muoproduction is 6.9+1.9−1.4 nb. The structure function F2(cc) for diffractive charmed‐quark pair production is presented.

Limit on UPSILON muoproduction at 209 GeV

We present the dimuon mass spectrum from 102 678 three-muon final states produced by muon interactions within a magnetized steel calorimeter. The data place a 90%-confidence limit on the production of {Upsilon} states by muons: {sigma}({mu}N{yields}{mu}{Upsilon}X)B({Upsilon}{yields}{mu}{sup +}{mu}{sup -})<22x10{sup -39} cm{sup 2}, consistent with a photon-gluon-fusion model calculation.