The four LEP collaborations, ALEPH, DELPHI, L3 and OPAL, have searched for the neutral Higgs bosons which are predicted by the Minimal Supersymmetric Standard Model (MSSM). The data of the four collaborations are statistically combined and examined for their consistency with the background hypothesis and with a possible Higgs boson signal. The combined LEP data show no significant excess of events which would indicate the production of Higgs bosons. The search results are used to set upper bounds on the cross-sections of various Higgs-like event topologies. The results are interpreted within the MSSM in a number of "benchmark" models, including CP-conserving and CP-violating scenarios. These interpretations lead in all cases to large exclusions in the MSSM parameter space. Absolute limits are set on the parameter tan β and, in some scenarios, on the masses of neutral Higgs bosons.

This Letter describes the search for a new heavy charged gauge boson W ′ decaying into an electron and a neutrino. The data were collected with the D0 detector at the Fermilab Tevatron pp Collider at √ s = 1.96 TeV, and correspond to an integrated luminosity of about 1 fb −1 . Lacking any significant excess in the data in comparison with known processes, an upper limit is set on σ W ′ × B(W ′ → eν),

No abstract

No abstract

We report on several methodologically different NNLO determinations of the strong coupling constant from event shapes and related observables in e+e-annihilation. The event shape distributions are analyzed within a combined framework of NNLO and NNLA resummation. We also investigate the role of hadronisation corrections, using both Monte Carlo generator predictions and analytic models to parametrise non-perturbative power corrections.