Measurements of four-lepton production at the Z resonance in pp collisions at s =7 and 8 TeV with ATLAS

Measurements of four-lepton (4, =e,μ) production cross sections at the Z resonance in pp collisions at the LHC with the ATLAS detector are presented. For dilepton and four-lepton invariant mass regions m+->5GeV and 80<m4<100GeV, the measured cross sections are 76±18(stat) ±4(syst)±1.4(lumi)...

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Guardado en:
Detalles Bibliográficos
Autor principal: Aad, G.
Formato: JOUR
Materias:
Bosons
Tellurium compounds
ATLAS detectors
Branching fractions
Invariant mass
Lepton productions
Measurements of
Nonresonant
Production cross section
The standard model
Elementary particles
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00319007_v112_n23_p_Aad
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:Measurements of four-lepton (4, =e,μ) production cross sections at the Z resonance in pp collisions at the LHC with the ATLAS detector are presented. For dilepton and four-lepton invariant mass regions m+->5GeV and 80<m4<100GeV, the measured cross sections are 76±18(stat) ±4(syst)±1.4(lumi)fb and 107±9(stat)±4(syst) ±3.0(lumi)fb at s=7 and 8 TeV, respectively. By subtracting the nonresonant 4 production contributions and normalizing with Z→μ+μ- events, the branching fraction for the Z boson decay to 4 is determined to be (3.20±0.25(stat)±0.13(syst))×10-6, consistent with the standard model prediction. © 2014 CERN, for the ATLAS Collaboration.

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