Search for a light scalar top squark ine+e−

Measurement of the cross section using a soft-pion analysis in two-photon processes

“…Recently, at search was carried out by the VENUS group [32]. They have shown an mγ upper limit of ∼ 12.7 GeV for the case when mt = 15 GeV.…”

“…From these figures, the experimental excesses are considered to be high-thrust events and high missing-P T events. In order to minimize this discrepancy in the missing P T -distribution, although we must set a larger mass difference (mt − mγ), it may conflict with the recent search fort pair production by the VENUS experiment [32].…”

Gluon radiation off scalar stop particles

“…The mass of the lightest eigenstatet 1 could be so low that the particle may eventually be accessible at the existing pp and even e + e − storage rings. So far the result of search experiments at e + e − colliders [4,5] has been negative and a lower limit of 45.1 GeV has been set at LEP [5] for the L/R mixing angle outside the band of cos 2 θ t between 0.17 and 0.44 and for a mass difference between thet 1 and the lightest neutralinoχ 0 1 of more than 5 GeV. The higher energy at LEP2 and dedicated efforts at the Tevatron will open the mass range beyond the current limits soon.…”