Particle Physics Seminar

12:30 pm MCP 215

ATLAS ttH Measurements in the H(diphoton) Channel
Jennet Dickinson, LBL

In Run 2 of the Large Hadron Collider (LHC), the ATLAS experiment hascollected a set of proton-proton collision data of unprecedented size and at highercenter-of-mass energy than any previous collider experiment. This dataset pro-vides an opportunity for high-precision studies of the Higgs boson, includingmeasurements of Higgs couplings to fermions and bosons. The coupling betweenthe Higgs and top quark can be directly probed by measuring Higgs produc-tion in association with a top-antitop pair (ttH), which the Standard Modelpredicts at a rate of about 1% of the total Higgs cross section in LHC Run 2.Measurement of ttH in conjunction with the Higgs to diphoton decay channeltakes advantage of the high photon detection efficiency and energy resolutionof the ATLAS electromagnetic calorimeter, as well as the relatively low rate ofdiphoton background processes. The multivariate techniques used to identifyttH(diphoton) events in the full Run 2 ATLAS dataset will be presented, andthe impact of models of new physics on the ttH process will be discussed.

Event Type

Seminars

Dec 16