D. M. J. Lovelock

Search for light gluinos

Abstract A study of radiative decays from 400 000 ϒ (9460)s in the partially upgraded CUSB detector is presented. We find evidence against the existence of gluinos of mass 0 6(GeV/ c 2 ) c 2 ) from a search for radiative ϒ (9460) decays into bound states of gluinos.

Study of π+π− transitions from the γ (3S) state

Abstract With the CUSB-II detector at CESR we have studied the processes γ (3S) → γ (1S) π + γ − and γ (3S) → γ (2S) π + π − , where the final state γ (1S or 2S) decays into a pair of leptons. We have found 451 γ (3S) → γ (1S) π + π − events and 138 γ (3S) → γ (2S) π + π − events. The corresponding branching ratios are (4.46 ± 0.34 ± 0.50)% and (4.82 ± 0.65 ± 0.53) % respectively, where the first error is statistical and the second systematic. The properties of the π + π − system have been studied and compared with several models.

CUSB-II: a high precision electromagnetic spectrometer

Abstract The design, construction and performance of a very compact precision electromagnetic spectrometer is described. The CUSB-II detector has been used to study ϒ spectroscopy, search for exotic particles and measure properties of the B and B ∗ mesons at the Cornell Electron Storage Ring.