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T: Fachverband Teilchenphysik
T 13: QCD (Theorie) 3 / Elektroschwache Physik (Theorie)
T 13.7: Vortrag
Mittwoch, 11. März 2009, 18:15–18:30, M109
Higgs Pair Production at the LHC — •Marina Billoni1, Stefan Dittmaier1, and Alexander Mück2 — 1Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), München — 2Paul Scherrer Institut, Würenlingen und Villigen
Higgs pair production provides important information about the specific shape of the Higgs potential, in particular about the triple-Higgs coupling. After the discovery of a massive neutral spin-0 particle at the LHC, the next crucial test of the Standard Model (SM) consists in the experimental reconstruction of this potential. Therefore precise theoretical predictions for the different production rates of Higgs pairs are mandatory.
We focus on Higgs pair production in association with an additional vector boson at the LHC within the SM and the Minimal Supersymmetric Standard Model (MSSM). A calculation of the next-to-leading-order QCD corrections is performed in both cases reducing the scale dependences to a few percent. Within the SM, the total cross sections are less than 1 fb but show a high sensitivity to the triple-Higgs coupling. In the MSSM, we consider neutral Higgs pairs and processes involving triple-Higgs couplings. In order to account for the largest contributions of electroweak corrections, we use the loop-improved Higgs masses and couplings provided by the program FeynHiggs. The benchmark point SPS1a is chosen in the first instance, however different points in the MA−tanβ plane are investigated. In some parameter regions, the cross section can be enhanced by resonances (H→h h, H±→h W±, A→h Z) to the 10 fb level.