Search for scalar top and scalar bottom quarks at √s = 170-172 GeV in e e- collisions

K Ackerstaff; G Alexander; J Allison; N Altekamp; KJ Anderson; S Anderson; S Arcelli; S Asai; D Axen; G Azuelos; AH Ball; E Barberio; RJ Barlow; R Bartoldus; JR Batley; S Baumann; J Bechtluft; C Beeston; T Behnke; AN Bell; KW Bell; G Bella; S Bentvelsen; P Berlich; S Bethke; O Biebel; A Biguzzi; SD Bird; V Blobel; IJ Bloodworth; JE Bloomer; M Bobinski; P Bock; D Bonacorsi; M Boutemeur; BT Bouwens; S Braibant; L Brigliadori; RM Brown; HJ Burckhart; C Burgard; R Bürgin; P Capiluppi; RK Carnegie; AA Carter; JR Carter; CY Chang; DG Charlton; D Chrisman; PEL Clarke; I Cohen; JE Conboy; OC Cooke; M Cuffiani; S Dado; C Dallapiccola; GM Dallavalle; S De Jong; LA Del Pozo; K Desch; MS Dixit; E Do Couto E Silva; M Doucet; E Duchovni; G Duckeck; IP Duerdoth; D Eatough; JEG Edwards; PG Estabrooks; HG Evans; M Evans; F Fabbri; M Fanti; AA Faust; F Fiedler; M Fierro; HM Fischer; I Fleck; R Folman; DG Fong; M Foucher; A Fürtjes; DI Futyan; P Gagnon; JW Gary; J Gascon; SM Gascon-Shotkin; NI Geddes; C Geich-Gimbel; T Geralis; G Giacomelli; P Giacomelli; R Giacomelli; V Gibson; WR Gibson; DM Gingrich; D Glenzinski; J Goldberg; MJ Goodrick; W Gorn

Journal article

Search for scalar top and scalar bottom quarks at √s = 170-172 GeV in e e- collisions

K Ackerstaff, G Alexander, J Allison, N Altekamp, KJ Anderson, S Anderson, S Arcelli, S Asai, D Axen, G Azuelos, AH Ball, E Barberio, RJ Barlow, R Bartoldus, JR Batley, S Baumann, J Bechtluft, C Beeston, T Behnke, AN Bell Show all

Zeitschrift Fur Physik C Particles and Fields | SPRINGER | Published : 1997

DOI: 10.1007/s002880050484

Abstract

A search for a scalar top quark has been performed using a total data sample of 10.4 pb-1 at centre-of-mass energies of √s = 170 and 172 GeV collected with the OPAL detector at LEP. No candidate events were observed. Combining this result with those obtained at √s = 130, 136 and 161 GeV, the 95% C.L. lower limit on the scalar top quark mass is 66.8 GeV, if the mixing angle between the supersymmetric partners of the left- and right-handed states of the top quark is smaller than π/4. If the mixing angle is zero, the limit is 73.3 GeV. These limits were obtained assuming that the scalar top quark decays into a charm quark and the lightest neutralino, and that the mass difference between the sca..

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