Heavy Gauge Boson Measurements in pp Collisions at 7 and 8 TeV Energies with the CMS Experiment

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Venue:AHC3-205, MMC

Abstract:

With the Higgs discovery the LHC experiments at the CERN pp collider started the exploration of the last missing piece of the Standard Model of particle physics. To make this discovery the Higgs "needles" have to be separated from the huge stack of Standard Model backgrounds. In this talk I will concentrate on the production and decays of heavy gauge bosons at center-of-mass energies of 7 and 8 TeV, as measured by the CMS experiment. They enable a large variety of physics studies, in addition to being an integral part of the Higgs search. Measurements of inclusive W, Z and Drell Yan production cross sections with decays to electrons or muons are presented, based on data recorded by the CMS detector between 2010 and 2012. These results constrain the parton densities for valence and sea quarks in the protons, and put stringent limits on many popular extensions of the Standard Model. Precise measurements of di-boson production will be discussed next: WW, WZ and ZZ decaying to leptons, and WW+WZ pairs decaying semi-leptonically. We present first studies of exclusive and quasi-exclusive W+W- production in 7 TeV p-p collisions at the LHC, and studies of triple boson final states involving photons. The results are interpreted in terms of constraints on anomalous triple or quartic gauge boson couplings.

Biography:

Dimitri Bourilkov graduated from Sofia University, Bulgaria, in 1978, and completed his Ph.D. in particle physics in 1986 at the Institute for Nuclear Research in Sofia. During these years he was a member of the BIS2 collaboration at the Serpukhov accelerator in Russia, studying charm and strange hadron production in strong interactions. From 1988-2001 he worked in the Katholieke Universiteit Nijmegen, the Netherlands, and Swiss Federal Institute of Technology, Zurich, teams in the L3 experiment at the e+e- collider at CERN, studying the di-electron and di-muon channels and searching for new physics like contact interactions, large extra dimensions in low scale gravity models, Z' bosons, leptoquarks or supersymmetric neutrinos. In 1994 Dr. Bourilkov joined the CMS experiment, and is working full time on it since 2001 as Scientist at the University of Florida, USA. His current interests include the study of W, Z and Drell-Yan production, parton density functions, searches for contact interactions, extra dimensions and heavy gauge bosons Z', and grid/cloud computing.

The event is free and open to the public. Undergraduates and graduates are encouraged to attend