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

Journal Article · Tue Nov 25 00:00:00 EST 2014 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

DOI:https://doi.org/10.1103/PhysRevD.90.093008· OSTI ID:1304775

Campbell, John M. ^[1]; Ellis, R. Keith ^[1]; Furlan, Elisabetta ^[1]; Rontsch, Raoul ^[1]

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1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Here, 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 gq$$\bar{q}$$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 m_ZZ>2m_Z. In the region m_ZZ > 300 GeV 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.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Grant/Contract Number: AC02-07CH11359
• OSTI ID: 1304775
• Report Number(s): FERMILAB-PUB-14-315-T; arXiv:1409.1897; PRVDAQ; 1315346
• Journal Information: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 90, Issue 9; ISSN 1550-7998
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS