Topic of the Week

Alexander Paramonov

Dec 4th

Day Speaker Topic Where
Dec 4th at 3pm Alexander Paramonov (Argonne) Study of jets produced in association with a vector boson WH11 NE (Sunrise)

Descriptions / About the scientists

Guest: Alexander Paramonov
Date: Dec 4th
Time: 3pm
Topic: Where: WH11 NE (Sunrise)


The production of jets in association with a vector boson is of great interest since these processes are irreducible backgrounds to signal events from new physics as well as a benchmark for development of modern theoretical predictions. Events containing a vector boson and hadronic jets were observed in proton-proton collisions at a center-of-mass energy of 7 TeV. The data were collected with the ATLAS detector at the CERN LHC and comprise the full 2010 data sample. Cross sections are determined using both the electron and muon decay modes of the W and Z bosons. The results, corrected for all detector effects and for all backgrounds such as diboson and top quark pair production, are compared with particle-level predictions from perturbative QCD. Leading-order multiparton event generators, normalized to the next-to-next-to-leading-order total cross section for inclusive V-boson production, describe the data reasonably well for all measured inclusive jet multiplicities. Next-to-leading-order calculations from BlackHat-Sherpa, studied here for N_jet >= 4, are found to be mostly in good agreement with the data.

About the Scientist

Alexander received his BS in physics and applied math with honors in 2003 at the Moscow Instituted of physics and technology. He continued there to obtain his MS in 2005. He then entered the doctoral program at the University of Chicago and while there joined the CDF collaboration, where he completed his thesis on "Search for Flavor Changing Neutral Currents in Top Decays at CDF". He joined Argonne National Lab in June of 2009 to work with ATLAS collaboration, and in August of 2012 accepted an assistant physicist position.