LEP EW WG Plots for the Summer 2004 Conferences
Latest corrections and/or modifications 09-Aug-2004.
You can find here the plots that have been produced for the Summer
2004 conferences. Many results and plots are still based on
preliminary results. Note that essentially the full set of
plots will be made available, including those that have data that
hasn't changed, so that "one-stop shopping" can be done.
Changes:
Compared to summer 2003, an important change is given by the latest
Tevatron Run-I combination in M_top, yielding M_top = 178.0+-4.3
GeV. Compared to winter 2004, ZFITTER 6.36 is replaced by ZFITTER
6.40 for the calculation of SM predictions (now including complete
two-loop calculations for MW and fermionic two-loop calculations for
sin2teff). Also, the Z-pole heavy flavour combination is updated.
Attention:
Since winter 2004, the global SM fits now use only
high-Q2 results from LEP, SLC and the Tevatron (together with the
hadronic vacuum polarisation). This disentangles the numerical
Higgs-mass constraints and limit from the issue of the high chi2
caused by the low-Q2 NuTeV measurement which, however, has only a
small influence on the fitted Higgs mass. Based on these analyses,
predictions for low-Q2 measurements such as atomic parity violation in
cesium (APV), parity violation in Moller scattering (e-e-), and
neutrino-nucleon scattering (NuTeV) are derived.
Answers to FAQs on plots presented below:
- For plots showing generic SM predictions in form of arrows or areas,
the following parametric variations are used:
dal5had = 0.02761(36),
alpha_s = 0.118(2),
MZ = 91187.5(2.1) MeV,
M_top = 178.0(4.3) GeV,
M_Higgs = 300+700-186 GeV (lower limit of 114 GeV as given by the
direct search). The arrows are pointing in the
direction of increasing parameter values!
- Afb_q and R_q[=GZ_q/GZ_had] bar-chart plots for heavy quark flavours
comparing ADLOS results:
- In contrast to previous versions of these plots for older
conferences, all numerical values as well as all dots with
error bars are so-called pole quantities, eg, Afb0q, and in
particular corrected to exactly the same set of values for
other parameters. When applicable, the measurements at the
off-peak energy are transported to the peak and included
in the results.
- Thus the results shown are directly comparable, among
themselves as well as with the average, but do not
neccessarily correspond digit-by-digit to the numerical
values found in the individual experimental publications.
- Light-quark effective couplings plot:
- In this analysis, the hadronic Z-decay partial width is no
longer an independent parameter but is calculated as:
GZ_had = GZ_dd+GZ_uu+GZ_ss+GZ_cc+GZ_bb.
- Since there are not sufficiently many different light-quark
flavour pseudo-observables measured to disentangle u, d and s
quarks completely, an assumption is made in the extraction of
pseudo-observables, such as partial widths or effective coupling
constants, for light quarks: quark universality is imposed for
the two down-type light-quark flavours, so that s=d for all
pseudo-observables relating to s and d quarks.
- For the light-quark contours (u and d=s), a second solution
exists, mirroring the contour curves at the origin,
(gvq,gaq) <->(-gvq,-gaq). The light-quark measurements are
also invariant under the exchange gvq<->gaq, leading to
contours symmetric with respect to the diagonal (gvq=gaq).
To resolve these ambiguity, one needs to measure the CM energy
dependence of the asymmetry
(which is done only for the heavy quarks b and c).
- The allowed area for neutrinos, assuming three generations
of neutrinos with identical vector couplings and identical
axial-vector couplings, is bounded by circles centred at the
origin since the invisible partial width constrains the sum
of the squares of the effective couplings only. The ring is
so thin that it appears as a single line in the plot.
- Epsilon-parameter contour
- Based on a fit varying alpha(dal5had), alpha_s, MZ, and the
four epsilon_123b parameters
- Data set consists of all measurements except Gamma_W, M_top
and sin2theta from NUTEV due to its explicit M_top/M_Higgs
dependence (M_top/M_Higgs cannot be expressed in terms of the
four epsilon parameters). APV is also not included, as
additional model assumptions are needed to express APV in
terms of the epsilon parameters.
- STU-parameter contour
- Based on a fit varying alpha(dal5had), alpha_s, MZ, and the
three STgamma_b parameters
- U=0 fixed throughout
- Data set consists of all measurements except Gamma_W, M_top
and sin2theta from NUTEV due to its explicit M_top/M_Higgs
dependence (M_top/M_Higgs cannot be expressed in terms of the
four STUgamma_b parameters). APV is also not included, as
additional model assumptions are needed to express APV in
terms of the STUgamma_b parameters.
- The additional bands correspond to +-1sigma bands for the
alpha_s independent quantities
GZ_lepton, MW and sin2teff (in order of increasing
slope dT/dS). GZ_lepton instead of GZ_tot is chosen because
the latter depends in addition on alpha_s and the former
exhibits a more extreme (ie, flatter) slope.
All other fit parameters are fixed.
- The MSM reference values (STUgamma_b=0) are dal5had=0.02761,
alpha_s=0.118, MZ=91.1875 GeV, M_top=175 GeV, M_Higgs=150 GeV
- Higgs constraint from each measurement:
- For each observable, the corresponding constraint on the
Higgs mass is determined in a full MSM fit to the measurement
result of this observable, constraining
dal5had=0.02761+-0.00036, alpha_s=0.118+-0.002, MZ =
91.1875+-0.0021 GeV and M_top=178.0+-4.3 GeV.
- For Higgs masses larger than about 1 TeV, the MSM and its
formulae used do not make too much sense, so that part of
the Higgs mass regime is cut of as it should not be taken
quantitatively.
- The vertical green band denotes the overall constraint on the
Higgs mass derived from the fit to all data.
- The vertical black line denotes the limit on the Higgs mass
obtained from the direct search at LEP-2.
- The effects of real Higgs-strahlung, Z*+H, is not taken into
account, neither in the experimental analyses (such as
Higgs-mass dependent efficiencies for various Z*H decay
channels) nor in the calculation of MSM predictions (increased
Z decay widths). Thus quantitative conclusions from individual
observables are uncertain in the low Higgs-mass regime.
Enjoy!
Final LEP-1 Z lineshape and leptonic forward-backward asymmetries:
lep1_mz.eps.gz
lep1_gz.eps.gz
lep1_sh.eps.gz
lep1_rl.eps.gz
lep1_al.eps.gz
s04_rl_afbl_contours.eps.gz
Final LEP-1 tau polarisation:
lep1_pt.eps.gz
lep1_pe.eps.gz
Final SLD + LEP-1 derived leptonic couplings:
s04_gal_gvl_contours.eps.gz
Preliminary SLD + LEP-1 heavy quark flavours:
afbene_b.eps.gz
afbene_c.eps.gz
afbene_bc.eps.gz
afb_all_bb0_nsm_summer04.eps.gz
afb_all_cc0_nsm_summer04.eps.gz
afb_all_bb0_summer04.eps.gz
afb_all_cc0_summer04.eps.gz
rb_bar.eps.gz
rc_bar.eps.gz
s04_rb_rc_contours.eps.gz
s04_afbb_afbc_contours.eps.gz
s04_ab_ac_contours.eps.gz
Preliminary SLD + LEP-1 derived couplings:
s04_al_ab_bands.eps.gz
s04_al_ac_bands.eps.gz
s04_gaf_gvf_contours.eps.gz
s04_gab_gvb_contours.eps.gz
s04_glb_grb_contours.eps.gz
s04_gac_gvc_contours.eps.gz
s04_glc_grc_contours.eps.gz
s04_rho_sef_contours.eps.gz
s04_sef2_theta.eps.gz
mw_qqln.eps.gz
mw_qqqq.eps.gz
mw_lep.eps.gz
lep2_s04_mw.eps.gz
gw_lep.eps.gz
lep2_s04_gw.eps.gz
Preliminary constraints on the Standard Model:
Results from other experiments are also included!
s04_gl_s2_contours.eps.gz
s04_ro_s2_contours.eps.gz
s04_mw_s2_contours.eps.gz
s04_mw_gl_contours.eps.gz
s04_ro_mw_contours.eps.gz
s04_eps_contours.eps.gz
s04_stu_contours.eps.gz
s04_mt_mw_contours.eps.gz
s04_plot_mt.eps.gz
s04_plot_mw.eps.gz
s04_plot_gw.eps.gz
s04_mw_gw_contours.eps.gz
s04_mh_mt_contours.eps.gz
s04_mh_mw_contours.eps.gz
s04_mh_ah_contours.eps.gz
s04_mh_mt_bands.eps.gz
s04_top_sensitivity_1.eps.gz
s04_higgs_sensitivity_1.eps.gz
s04_higgs_sensitivity_2.eps.gz
s04_higgs_sensitivity_3.eps.gz
s04_higgs_sensitivity_4.eps.gz
s04_show_sens.eps.gz
s04_show_higgs.eps.gz
s04_show_pull_18.eps.gz
s04_blueband.eps.gz
Modified: Fri Jul 11 08:14:05 METDST 2003 by Martin Grünewald