July 31, 2017 to August 4, 2017
Fermi National Accelerator Laboratory
US/Central timezone

Measuring the $t\bar{t}$ Forward-Backward Asymmetry using semi-leptonic final states at 8 TeV with the CMS detector

Jul 31, 2017, 6:32 PM
Reception Area (Fermi National Accelerator Laboratory)

Reception Area

Fermi National Accelerator Laboratory

Poster Top Quark Physics Poster Session and Reception


lei feng (Johns Hopkins University)


We presents a measurement of Forward-Backward Asymmetry($\displaystyle{A_{FB}}$) in $t\bar{t}$ production. The data sample corresponds to $19.7\,\textrm{fb}^{-1}$ of integrated luminosity in proton-proton collisions at $\sqrt{s} = 8\,\textrm{TeV}$ collected by the CMS experiment at the LHC. Events selected contain a single isolated muon or electron, with four or five jets of which two are b-tagged. A template technique is used to extract the asymmetry from the top quark kinematic distributions. This technique is based upon an extension of the tree-level cross section for $q\bar{q}$ initial states that sensitively isolates $q\bar{q}$ from $gg/qg$ initial states. The measured $A_{FB}$ and relative aboundance of $q\bar{q}$ initiated $t\bar{t}$ will be reported and compared to both theoretical calculation and results from D0 and CDF experiments of Tevatron.

Primary author

lei feng (Johns Hopkins University)


Morris Swartz (Johns Hopkins University) Nick Eminizer (Johns Hopkins University)

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