Jet Physics and Measurement of D*+ Meson Production in Jets at ATLAS

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Date/Time:Wednesday, 22 Aug 2012 from 4:10 pm to 5:10 pm
Location:A401, Zaffarano Hall
Contact:CHunhui Chen
Channel:High Energy Physics
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Dr. Arantxa Ruiz Martinez, Iowa State University

Jet production is the dominant high-pT process in the proton-proton collisions at the CERN Large Hadron Collider. Jet measurements at ATLAS provide the opportunity to test the QCD predictions in an unprecedented energy regime and are a key element to understand the backgrounds to New Physics searches. The measurement of jets originating from heavy flavor quarks is an important part of the ATLAS jet physics program. The D*+ meson production in jets has been measured with 0.30 pb-1 of ATLAS data collected between April and July 2010 at a center-of-mass energy of 7 TeV. D*+ mesons found in jets have been reconstructed using tracking information in the decay chain: D*+ -> D0pi+, D0 -> K-pi+, and its charge conjugate. The production rate of D*+ mesons in jets with pT between 25 and 70 GeV in the pseudorapidity range |eta| < 2.5 has been measured as a function of the fraction z of the jet momentum carried by the D*+;. Monte Carlo predictions from the available generators failed to describe the data at small values of the jet pT and z.