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4-11 July 2012
Melbourne Convention and Exhibition Centre
Australia/Melbourne timezone
ICHEP2012 - 36th International Conference for High Energy Physics

Measurements of WW and WZ production in W + jets final states in ppbar collisions

6 Jul 2012, 12:15
15m
Plenary 3 (Melbourne Convention and Exhibition Centre)

Plenary 3

Melbourne Convention and Exhibition Centre

Melbourne Australia
Parallel Sessions Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches Plenary3 - The Standard Model -TR1

Speaker

Mr Gregorio Bernardi (LPNHE University of Paris (FR))

Description

We study WW and WZ production with l nu q q (l=e,mu) final states using data collected by the D0 detector at the Fermilab Tevatron Collider corresponding to 4.3 fb-1 of integrated luminosity from ppbar collisions at sqrt(s)=1.96 TeV. Assuming the ratio between the production cross sections sigma(WW) and sigma(WZ) as predicted by the standard model, we measure the total WV (V=W,Z) cross section to be sigma(WV)= 19.6^{+3.2}_{-3.0} pb, and reject the background-only hypothesis at a level of 7.9 standard deviations. We also use b-jet discrimination to separate the WZ component from the dominant WW component. Simultaneously fitting WW and WZ contributions, we measure sigma(WW) = 15.9^{+3.7}_{-3.2} pb and sigma(WZ) = 3.3^{+4.1}_{-3.3} pb, which is consistent with the standard model predictions.

Primary author

Mr Gregorio Bernardi (LPNHE University of Paris (FR))

Presentation materials