We study interference effects in the production channel ZZ+jet, in particular focusing on the role of the Higgs boson. This production channel receives contributions both from Higgs boson mediated diagrams via the decay H→ZZ (signal diagrams), as well as from diagrams where the Z bosons couple directly to a quark loop (background diagrams). We consider the partonic processes gggZZ and gqq¯ZZ in which interference between signal and background diagrams first occurs. Since interference is primarily an off-resonant effect for the Higgs boson, we treat the Z bosons as on shell. Thus our analysis is limited to the region above threshold, where the invariant mass of the Z-pair mZZ satisfies the condition mZZ>2mZ. In the region mZZ>300GeV we find that the interference in the ZZ+jet channel is qualitatively similar to interference in the inclusive ZZ channel. Moreover, the rates are sufficient to study these effects at the LHC once jet-binned data become available.

Interference effects for Higgs boson mediated Z -pair plus jet production / J.M. Campbell, R. Keith Ellis, E. Furlan, R. Röntsch. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 90:9(2014 Nov 25), pp. 093008.093008-1-093008.093008-12. [10.1103/PhysRevD.90.093008]

Interference effects for Higgs boson mediated Z -pair plus jet production

R. Röntsch
Ultimo
2014

Abstract

We study interference effects in the production channel ZZ+jet, in particular focusing on the role of the Higgs boson. This production channel receives contributions both from Higgs boson mediated diagrams via the decay H→ZZ (signal diagrams), as well as from diagrams where the Z bosons couple directly to a quark loop (background diagrams). We consider the partonic processes gggZZ and gqq¯ZZ in which interference between signal and background diagrams first occurs. Since interference is primarily an off-resonant effect for the Higgs boson, we treat the Z bosons as on shell. Thus our analysis is limited to the region above threshold, where the invariant mass of the Z-pair mZZ satisfies the condition mZZ>2mZ. In the region mZZ>300GeV we find that the interference in the ZZ+jet channel is qualitatively similar to interference in the inclusive ZZ channel. Moreover, the rates are sufficient to study these effects at the LHC once jet-binned data become available.
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
25-nov-2014
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/904199
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