ar X iv : h ep - p h / 99 09 44 8 v 2 2 7 Se p 19 99 Quasi - Fixed Points and Charge and Colour Breaking in Low Scale Models

ar X iv : h ep - p h / 99 09 44 8 v 1 2 1 Se p 19 99 Quasi - Fixed Points and Charge and Colour Breaking in Low Scale Models

We show that the current LEP2 lower bound upon the MSSM lightest Higgs mass rules out quasi-fixed scenarios for string scales between 10 8 and 10 14 GeV. We consider the implications for charge and colour breaking (CCB) bounds in the MSSM, and demonstrate that CCB bounds from F and D-flat directions are significantly weakened. For scales less than 10 10 GeV these bounds become merely that degen...

ar X iv : h ep - p h / 99 09 44 8 v 3 1 3 O ct 1 99 9 Quasi - Fixed Points and Charge and Colour Breaking in Low Scale Models

We show that the current LEP2 lower bound upon the MSSM lightest Higgs mass rules out quasi-fixed scenarios for string scales between 10 6 and 10 14 GeV for a central top quark mass. We consider the implications of the low string scale for charge and colour breaking (CCB) bounds in the MSSM, and demonstrate that CCB bounds from F and D-flat directions are significantly weakened. For scales less...

ar X iv : h ep - e x / 99 09 03 9 v 1 2 3 Se p 19 99 The Partonic Structure of the Quasi - Real Photon

New measurements of dijet photoproduction at HERA provide information on the gluon density in the photon and on its quark densities at high x γ and high factorisation scales.

ar X iv : h ep - e x / 99 09 03 7 v 1 2 2 Se p 19 99 Hadronic final state interactions at ALEPH and OPAL

The studies of Fermi–Dirac correlations of ΛΛ and ¯ Λ ¯ Λ pairs in hadronic Z decays, Bose–Einstein correlations and colour reconnection in W-pairs decays performed by the ALEPH collaboration in e + e − annihilation at LEP are presented. The OPAL analysis of Bose–Einstein correlations in W-pair decays is also discussed.

ar X iv : h ep - p h / 99 09 31 7 v 1 1 0 Se p 19 99 LAL 99 - 45 July 1999 AFTER SITGES F . RICHARD