Measurement of the cross-section of high transverse momentum vector bosons reconstructed as single jets and studies of jet substructure in $pp$ collisions at $\sqrt{s}$ = 7 TeV with the ATLAS detector

Abstract

This paper presents a measurement of the cross-section for high transverse momentum $W$ and $Z$ bosons produced in $pp$ collisions and decaying to all-hadronic final states. The data used in the analysis were recorded by the ATLAS detector at the CERN Large Hadron Collider at a centre-of-mass energy of $\sqrt{s}=7\mathrm{TeV}$ and correspond to an integrated luminosity of $4.6\mathrm{f}{\mathrm{b}}^{-1}$. The measurement is performed by reconstructing the boosted $W$ or $Z$ bosons in single jets. The reconstructed jet mass is used to identify the $W$ and $Z$ bosons, and a jet substructure method based on energy cluster information in the jet centre-of-mass frame is used to suppress the large multi-jet background. The cross-section for events with a hadronically decaying $W$ or $Z$ boson, with transverse momentum $p_{\mathrm{T}}>320\mathrm{GeV}$ and pseudorapidity $|\eta |<1.9$, is measured to be ${\sigma }_{W+Z}=8.5\pm 1.7$ pb and is compared to the next-to-leading-order calculations. The selected events are further used to study jet grooming techniques.

arXiv comment21 pages plus author list + cover pages (44 pages total), 5 figures, 1 tables, submitted to New J. Phys.. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2012-21/

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