Abstract
Measurements of fiducial and differential cross sections of Higgs boson production in the H→ZZ⁎→4ℓ decay channel are presented. The cross sections are determined within a fiducial phase space and corrected for detection efficiency and resolution effects. They are based on 20.3 fb−1 of pp collision data, produced at s=8 TeV centre-of-mass energy at the LHC and recorded by the ATLAS detector. The differential measurements are performed in bins of transverse momentum and rapidity of the four-lepton system, the invariant mass of the subleading lepton pair and the decay angle of the leading lepton pair with respect to the beam line in the four-lepton rest frame, as well as the number of jets and the transverse momentum of the leading jet. The measured cross sections are compared to selected theoretical calculations of the Standard Model expectations. No significant deviation from any of the tested predictions is found.
Highlights
In 2012 the ATLAS and CMS Collaborations announced the discovery of a new particle [1,2] in the search for the Standard Model (SM) Higgs boson [3,4,5,6,7,8] at the CERN Large Hadron Collider (LHC) [9]
The events are divided into bins of the variables of interest, which are computed with the reconstructed four-momenta of the selected lepton quadruplets or from the reconstructed jets: the transverse momentum prTe,cHo and the rapidity | yrHeco| of the fourlepton system, the invariant mass of the subleading lepton pair
For all variables and bins the total uncertainties on the cross-section measurements are dominated by statistical uncertainties
Summary
In 2012 the ATLAS and CMS Collaborations announced the discovery of a new particle [1,2] in the search for the Standard Model (SM) Higgs boson [3,4,5,6,7,8] at the CERN Large Hadron Collider (LHC) [9]. The differential measurements are performed in several observables related to the Higgs boson production and decay These include the transverse momentum pT,H and rapidity | yH | of the Higgs boson, the invariant mass of the subleading lepton pair m34 (the leading and subleading lepton pairs are defined in Section 3) and the magnitude of the cosine of the decay angle of the leading lepton pair in the four-lepton rest frame with respect to the beam axis | cos θ ∗|. The distribution of the pT,H observable is sensitive to the Higgs boson production mechanisms as well as spin/CP quantum numbers, and can be used to test perturbative QCD predictions. The distribution of the transverse momentum of the leading jet probes quark and gluon radiation
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