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T: Teilchenphysik

T 506: Ph
änomenologie I

T 506.6: Vortrag

Donnerstag, 30. März 2006, 18:00–18:20, HG2-HS6

Gluon-induced $WW$ background to Higgs boson searches at the LHC — •Nikolas Kauer¹, Thomas Binoth², Mariano Ciccolini³, and Michael Krämer⁴ — ¹Institut für Theoretische Physik, Universität Würzburg, D-97074 Würzburg, Germany — ²School of Physics, University of Edinburgh, EH9 3JZ Edinburgh, Scotland UK — ³Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland — ⁴Institut für Theoretische Physik E, RWTH Aachen, D-52056

Vector-boson pair production is an important background for Higgs boson and new physics searches at the Large Hadron Collider LHC. We present the loop-induced gluon-fusion process $gg ∖to WW ∖to {∖rm leptons}$, allowing for arbitrary invariant masses of the intermediate $W$ bosons. This process contributes at ${∖cal O}(∖alpha_{∖rm s}^2)$ relative to quark-antiquark annihilation, but its importance is enhanced by the large gluon flux at the LHC and by experimental cuts employed in Higgs boson searches. We find that $gg ∖to WW$ provides only a moderate correction (ca.∖ 5∖%) to the inclusive $W$-pair production cross section at the LHC. However, after taking into account realistic experimental cuts, the gluon-fusion process becomes significant and increases the theoretical $WW$ background estimate for Higgs searches in the $pp ∖to H ∖to WW ∖to {∖rm leptons}$ channel by approximately 30∖%.