High Energy Physics Seminar

Speaker: Pier Paolo Giardino, Brookhaven National Laboratory

Title: In Search of the Higgs trilinear coupling: double and single Higgs processes

Refreshments available at 1:30 pm.

Date: Tue, 11 Sep 2018, 1:45 pm – 2:45 pm
Type: Seminar
Location: 1400 BPS Bldg.

One of the fundamental goals of the LHC is the study of the Higgs properties. While the couplings between the Higgs and other SM particles are known with ever-increasing precisions, the Higgs self-couplings have not been directly measured. In this talk I will explore two approaches to the measurement of the Higgs trilinear self-coupling. The first half of the talk will be dedicated to the standard method based on the production of a pair of Higgs bosons. In particular I will focus on a new technique that allows the analytical calculation of the NLO corrections to the gg to HH process. In the second half, instead, I will describe a different approach based on the measurement of single Higgs processes. The method relies on the effects that electroweak loops featuring an anomalous trilinear coupling would imprint on single Higgs production at the LHC. We find that the bounds on the self coupling are already competitive with those from Higgs pair production and will be further improved in the current and next LHC runs.