Preprint/Internal Report

PUBDB-2015-03547

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Measurements of four-lepton production in pp collisions at $\sqrt{s}= 8$ TeV with the ATLAS detector

ATLAS Collaboration (Collaboration author)DESY*

2015

Report No.: ATLAS-CONF-2015-031

Abstract: The four-lepton (4ℓ, ℓ=e,μ) production is measured in a mass range from 80 to 1000 GeV using 20.3 fb−1 of data in pp collisions at s√=8 TeV at the LHC with the ATLAS detector. The 4ℓ signal events come from the decays of resonant Z and Higgs bosons and the non-resonant ZZ continuum produced from qq¯, gg, and qg initial states. A total of 476 signal candidate events is observed with a background expectation of 26.2±3.6 events, enabling the measurement of the integrated cross section and the differential cross section as a function of the invariant mass and transverse momentum of the four-lepton system. In the mass range above 180 GeV, assuming the theoretical constraint on the qq¯ production cross section calculated with perturbative next-to-next-to leading order (NNLO) QCD and next-to-leading order (NLO) Electroweak corrections, the signal strength of the gluon-fusion component with respect to the leading order (LO) prediction is determined to be μgg=2.4±1.0(stat.)±0.5(syst.)±0.8(theory)

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Contributing Institute(s):

1. LHC/ATLAS Experiment (ATLAS)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF3-611) (POF3-611)

Experiment(s):

1. LHC: ATLAS

Appears in the scientific report 2015

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Database coverage:

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