Measurement of k T splitting scales in W→ℓν events at s√=7 TeV with the ATLAS detector

Abstract

A measurement of splitting scales, as defined by the k T clustering algorithm, is presented for final states containing a W boson produced in proton–proton collisions at a centre-of-mass energy of 7 TeV. The measurement is based on the full 2010 data sample corresponding to an integrated luminosity of 36 pb−1 which was collected using the ATLAS detector at the CERN Large Hadron Collider. Cluster splitting scales are measured in events containing W bosons decaying to electrons or muons. The measurement comprises the four hardest splitting scales in a k T cluster sequence of the hadronic activity accompanying the W boson, and ratios of these splitting scales. Backgrounds such as multi-jet and top-quark-pair production are subtracted and the results are corrected for detector effects. Predictions from various Monte Carlo event generators at particle level are compared to the data. Overall, reasonable agreement is found with all generators, but larger deviations between the predictions and the data are evident in the soft regions of the splitting scales. The European Physical Journal C The European Physical Journal C Look Inside EPJC is an open-access journal funded by SCOAP3 and licensed under CC BY 4.0 EPJC is an open-access journal funded by SCOAP3 and licensed under CC BY 4.0 Within this Article Introduction Data analysis Monte Carlo simulations Detector-level comparisons of Monte Carlo to data Particle-level extraction Systematic uncertainties Results Conclusions References References Other actions Export citation Register for Journal Updates About This Journal Reprints and Permissions Add to Papers Share Share this content on Facebook Share this content on Twitter Share this content on LinkedIn