Upcoming Events

Evidence for a New, Higgs-like Boson Decaying to Two W Bosons Using the ATLAS Detector

August 9, 2012 12:00PM to 1:00PM
Presenter 
Eric Feng (HEP)
Location 
Building 362, Room F108
Type 
Seminar
Series 
Abstract:
The long-sought Higgs boson has been postulated to be the source of electroweak symmetry-breaking that gives rise to the masses of fundamental particles in the Standard Model. The ATLAS experiment at the Large Hadron Collider has searched for the Higgs boson using approximately 11 inverse femtobarns of proton-proton collision data taken during 2011 and 2012. I will describe the observation in the data of a neutral, Higgs-like boson with a mass of approximately 126 GeV. I will focus on its decay to a pair of W bosons, where an excess over the expected background has been observed that corresponds to a local significance of approximately 2.8 standard deviations. The total significance including other decay channels, such as pairs of Z bosons and photons, is 5.9 standard deviations. I will also discuss future measurements underway to determine the new particle's spin, parity, and couplings, which will tell us whether it is the Standard Model Higgs boson or an exotic imposter.