Standard Model III: Higgs and QCD Rogrio Rosenfeld Instituto de Fsica Terica UNESP Physics Beyond SM 06/12/2006 UFRJ Standard model (SU(3) c xSU(2) L xU(1) Y ) passed all experimental tests! It is based on three main principles: 1. Quantum field theory (renormalizability) 2. Gauge symmetry (fundamental interactions) 3. Spontaneous symmetry breaking (mass generation) Precision measurements at the 0.1% level allowed to test the model at the quantum level (radiative corrections). Top quark mass was predicted before its actual detection! However, symmetry breaking mechanism has not yet been directly tested. direct 95% CL - indirect searches [Robert Clare 2003] [LEPEWWG Summer 2006] : Summer 2006 ======================= Contact: Summer 2006: Changes in experimental inputs w.r.t. winter 2006 * New Tevatron Mtop * New LEP-2 MW and GW combination (ADLO final, but combination preliminary) Hence new world averages for MW and GW Blue-band studies: ================== For ZFITTER 6.41 and later (currently 6.42), and flag AMT4=6 fixed, two flags govern the theory uncertainties in the complete two-loop calculations of MW (DMWW=+-1: +-4 MeV) and fermionic two-loop calculations of sin2teff (DSWW=+-1: +-4.9D-5). The theory uncertainty for the Higgs-mass prediction is dominated by DSWW. The blue band will be the area enclosed by the two ZFITTER DSWW=+-1 \Delta\chi^2 curves. The one-sided 95%CL (90% two-sided) upper limit on MH is given by ZFITTER's DSWW=-1 curve: MH