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

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 $\sqrt{s}=7\mathrm{T}\mathrm{e}\mathrm{V}$ and correspond to an integrated luminosity of $4.6~\rm fb^{-1}$\mathrm{.}Themeasurementisperformedbyreconstructingtheboosted$W$or$Z$bosonsinsinglejets\mathrm{.}Thereconstructedjetmassisusedtoidentifythe$W$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 $p_{\mathrm{T}}>320\mathrm{G}\mathrm{e}\mathrm{V}$ and pseudorapidity $\mathrm{\mid }\eta \mathrm{\mid }<1.9$, 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.