Limits on the production of the Standard Model Higgs Boson in pp collisions at sqrt(s) =7 TeV with the ATLAS detector.

G. OTERO Y GARZON, R. PIEGAIA, ET. AL., THE ATLAS COLLABORATION

EUROPEAN PHYSICAL JOURNAL C - PARTICLES AND FIELDS

SPRINGER

Año: 2011 vol. 71 p. 1 - 30

1434-6044

A search for the Standard Model Higgs boson at the Large Hadron Collider (LHC) running at a centre-of-mass energy of 7 TeV is reported, based on a total integrated luminosity of up to 40 pb-1 collected by the ATLAS detector in 2010. Several Higgs boson decay channels: H ightarrow {gamma}{gamma}, H ightarrow ZZ (*) ightarrow llll, H ightarrow ZZ ightarrow ll{ u}{ u}, H ightarrow ZZ ightarrow llqq, H ightarrow W W (*) ightarrow l{ u}l{ u} and H ightarrow W W ightarrow l{ u}qq (l is e, {mu}) are combined in a mass range from 110 GeV to 600 GeV. The highest sensitivity is achieved in the mass range between 160 GeV and 170 GeV, where the expected 95% CL exclusion sensitivity is at Higgs boson production cross sections 2.3 times the Standard Model prediction. Upper limits on the cross section for its production are determined. Models with a fourth generation of heavy leptons and quarks with Standard Model-like couplings to the Higgs boson are also investigated and are excluded for a Higgs boson mass in the range from 140 GeV to 185 GeV.