One of the top priorities of the first run of the Large Hadron Collider has been to understand the Higgs mechanism and how it gives mass to particles. The Higgs decay to photons has been crucial for both the discovery of the new boson at 125 GeV and the measurement of its properties. The reconstruction of Higgs events relies on an excellent energy measurement of the two photons and the angle between them, which makes it deceptively simple. However, the messy environment of rapid pp-collisions and effects in the CMS detector invite significant improvements to optimize the Higgs sensitivity. This talk will focus on the key creative ideas that led to improvements in sensitivity like the use of a multivariate energy correction, using a multivariate classifier to remove background, and improved photon reconstruction using the CMS Particle Flow technique.
Friday, January 17, 2014 - 2:30pm
Rishi Patel (Rutgers U.)