IFLP   13074
INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
Measurement of Four-Lepton Production at the Z Resonance in pp Collisions at s√ = 7 and 8 TeV with ATLAS
Autor/es:
ATLAS COLLABORATION, G. AAD, F. MONTICELLI, ET AL
Revista:
PHYSICAL REVIEW LETTERS
Editorial:
AMER PHYSICAL SOC
Referencias:
Lugar: New York; Año: 2014 p. 1 - 23
ISSN:
0031-9007
Resumen:
Measurements of four-lepton (4ℓ, ℓ=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 region mℓ+ℓ−>5 GeV and 80<m4ℓ<100 GeV, 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 non-resonant 4ℓ production contributions and normalizing with Z→μ+μ− events, the branching fraction for the Z boson decay to 4ℓ is determined to be (3.20±0.25 (stat)±0.13 (syst))×10−6, consistent with the Standard Model prediction.