C. Bebek

The CLEO detector

Abstract The construction and performance of a large aperture magnetic detector designed for use at the Cornell Electon Storage Ring is descr bed.

Ruling out exotic models of b quark decay

Abstract We consider three broad classes of nonstandard models for b quark decay: (1) b → llq with charged or neutral leptons of arbitrary flavor; (2) b → l q q ; and (3) b → qa − where a − is a Higgs boson or hyperpion. For these classes of models we have calculated the charged energy fraction and the inclusive yields of electrons, muons, protons, and lambdas. We demonstrate that these model predictions are inconsistent with CLEO measurements at the γ (4S).

Hadronic Final States in Electroproduction

We present data on electroproduction off protons in which a hadron moving in approximately the same direction as the virtual photon is detected. Measurements were made at data points with nominal (Q2,W) values of (0.6,2.68), (1.2,2.68), (2.0,2.68) and (1.2,2.15) in (GeV2,GeV). The virtual photoproduction cross sections for (π±, K+, p) + Missing Mass are studied as a function of missing mass, Feynman scaling variables, Q2 and W. The results suggest a simple scaling behavior for pions. The data for the channel π+ n are used to determine values for the pion form factor. Protons show a simple behavior as a function of Q2 but not W. The K+ data show that the K+Σo cross section falls more rapidly than the K+Λ cross section as Q2 increases. There is evidence for hyperon resonance production in the missing mass distributions.