One of them is that it takes interferences between different processes into account. A new generator,called the bb4l model, is able to simulate collisions happening in LHC with new interesting features regarding process creating two W bosons and two b quarks. To understand the underlying physics behind these events, the real data must be compared to simulated events. Proton-proton collisions happening in LHC create lots of data. Supported by the US Department of Energy, contract DE-AC02-76ER00881.īb4l event generator, interferences and off-shell effects From a sample of 440 000 hadronic Z decays collected with the ALEPH detector at LEP, the ration Γ bb/Γhad = 0.228+/-0.005(stat.)+/-0.005(syst.) is measured. The method chosen applies a combination of shape discriminators and the selection of high transverse momentum leptons to event hemispheres. The branching fraction of Z -> bb relative to all hadronic decays of the Z has been measured using event shape variables to preferentially select Z -> bb events.
Measurement of the ratio Γ bb/Γhad using event shape variablesīuskulic, D.
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