Measurement of the pp̄→WZ+X cross section at s=1.96TeV and limits on WWZ trilinear gauge couplings

Measurement of the pp̄→WZ+X cross section at s=1.96TeV and limits on WWZ trilinear gauge couplings

We present measurements of the process pp̄→WZ+X→ℓ′ νℓ′ℓ̄ at s=1.96TeV, where ℓ and ℓ′ are electrons or muons. Using 1fb-1 of data from the D0 experiment, we observe 13 candidates with an expected background of 4.5±0.6 events and measure a cross section σ(WZ)=2.7-1.3+1.7pb. From the number of observe...

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Bibliographic Details
Main Authors: Abazov, V, Abbott, B, Abolins, M, Acharya, B, Adams, M, Adams, T, Aguilo, E, Ahn, S, Ahsan, M, Alexeev, G, Alkhazov, G, Alton, A, Alverson, G, Alves, G, Anastasoaie, M, Ancu, L, Andeen, T, Anderson, S, Andrieu, B, Anzelc, MS, Arnoud, Y, Arov, M, Arthaud, M, Askew, A, Åsman, B
Format: Journal article
Language:English
Published: 2007
Description
Summary:We present measurements of the process pp̄→WZ+X→ℓ′ νℓ′ℓ̄ at s=1.96TeV, where ℓ and ℓ′ are electrons or muons. Using 1fb-1 of data from the D0 experiment, we observe 13 candidates with an expected background of 4.5±0.6 events and measure a cross section σ(WZ)=2.7-1.3+1.7pb. From the number of observed events and the Z boson transverse momentum distribution, we limit the trilinear WWZ gauge couplings to -0.17≤λZ≤0.21(ΔκZ=0) at the 95% C.L. for a form factor scale Λ=2TeV. Further, assuming that Δg1Z= ΔκZ, we find -0.12≤ΔκZ≤0.29(λZ=0) at the 95% C.L. These are the most restrictive limits on the WWZ couplings available to date. © 2007 The American Physical Society.

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