Extra quark-lepton generations and precision measurements

M.Maltoni - Universita di Ferrara, Italy

V.Novikov, L.Okun - ITEP, Moscow

M.Vysotsky - INFN, Sezione di Ferrara, Italy and ITEP

A.Rozanov - ITEP and CPPM, IN2P3-CNRS, Univ. Mediterranee, Marseille

Figures for four generations paper:
  • Contributions of a fourth generation of fermions to delta4 V_R as a function of u ~ (m_u/m_Z)^2. We assumed m_nu = m_u and m_e = m_d = m_Z.
  • Contributions of a fourth generation of fermions to delta4 V_A as a function of u ~ (m_u/m_Z)^2. We assumed m_nu = m_u and m_e = m_d = m_Z.
  • Contributions of a fourth generation of fermions to delta4 V_M as a function of u ~ (m_u/m_Z)^2. We assumed m_nu = m_u and m_e = m_d = m_Z.
  • Ngenerations-deltam exclusion plot (35 standard dev.) assuming m_e=m_d=130 GeV and m_n=m_u in all extra generations. EWWG-99 data and constraint mH > 90 GeV at 95 % C.L. from LEP-2.
  • Ngenerations-deltam exclusion plot (35 standard dev.) assuming m_n=m_d=130 GeV and m_e=m_u in all extra generations. EWWG-99 data and constraint mH > 90 GeV at 95 % C.L. from LEP-2.
  • Ngenerations-deltam exclusion plot (35 standard dev.) assuming m_e=m_u=130 GeV and m_n=m_d in all extra generations. EWWG-99 data and constraint mH > 90 GeV at 95 % C.L. from LEP-2.
  • Fourth generation exclusion plot from LEPTOP fit to electroweak precision data. The parameters are the the mass of sbottom quark m_sb and the number of new generations, treated as a continuous parameter. It was assumed that the fourth generation is degenerate m_d4=m_u4=130 GeV, m_h=120 GeV, m_gluino = 200 GeV, no tL-tT mixing ThetaLR=0, m_st2=m_sb. Color plot in EPS format.
  • Fourth generation exclusion plot from LEPTOP fit to electroweak precision data. The parameters are the the mass of fourth generation neutrino and the number of new generations, treated as a continuous parameter. It was assumed that the fourth generation is non-degenerate and has m_e4= 100 GeV, m_d4= 200 Gev, m_u4=220 GeV, m_h - fitted as free parameter above LEP-2 limit. Color plot in EPS format, up to 5 extra generations, mN4 in the range 0.5MZ-1.0MZ.
  • Higgsino dominated quasi degenerate chargino and neutralino Ngenerations-deltam exclusion plot (35 standard dev.) assuming m_e=m_d=130 GeV and m_n=m_u in all extra generations and m(chargino/neutralino)=57 GeV. EWWG-99 data and constraint mH > 90 GeV at 95 % C.L. from LEP-2.
  • Gaugino dominated quasi degenerate chargino and neutralino Ngenerations-deltam exclusion plot (35 standard dev.) assuming m_e=m_d=130 GeV and m_n=m_u in all extra generations and m(chargino/neutralino)=57 GeV. EWWG-99 data and constraint mH > 90 GeV at 95 % C.L. from LEP-2.
  • Higgsino dominated quasi degenerate chargino and neutralino Ngenerations-m(chargino) exclusion plot (35 standard dev.) assuming me=md=130 GeV and mn=mu=sqrt(md**2+125**2) in all extra generations. EWWG-99 data and constraint mH > 90 GeV at 95 % C.L. from LEP-2.
  • Gaugino dominated quasi degenerate chargino and neutralino Ngenerations-m(chargino) exclusion plot (35 standard dev.) assuming me=md=130 GeV and mn=mu=sqrt(md**2+125**2) in all extra generations. EWWG-99 data and constraint mH > 90 GeV at 95 % C.L. from LEP-2.

    • Version 5.3 (1 Febrary 2000) of the four generations paper in LaTEX format with figures.

    Version 5.3 (1 Febrary 2000) of the four generations paper in PS format with figures.

    Version 5.3 (1 Febrary 2000) of the four generations paper in gzipped PS format with figures.

    AR