Improved measurement of ttZ couplings at the LHC

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We consider QCD t{bar t}Z production at the LHC with Z {yields} {bar {nu}}{nu} and all-hadronic t{bar t} decays, i.e. pp {yields} p{sub T}b{bar b}+4 jets, as a tool to measure ttZ couplings. This channel has a significantly larger cross section than those where the Z boson decays leptonically. However, t{bar t}, b{bar b} + 4 jet, t{bar t}j and t{bar t}jj production give rise to potentially large backgrounds. We show that these processes can be suppressed to an acceptable level with suitable cuts, and find that adding the p{sub T} b{bar b} + 4 jet channel to the final ... continued below

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16 pages

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Baur, U.; /SUNY, Buffalo; Juste, A.; /Fermilab; Rainwater, D.; Orr, L.H. et al. December 1, 2005.

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Description

We consider QCD t{bar t}Z production at the LHC with Z {yields} {bar {nu}}{nu} and all-hadronic t{bar t} decays, i.e. pp {yields} p{sub T}b{bar b}+4 jets, as a tool to measure ttZ couplings. This channel has a significantly larger cross section than those where the Z boson decays leptonically. However, t{bar t}, b{bar b} + 4 jet, t{bar t}j and t{bar t}jj production give rise to potentially large backgrounds. We show that these processes can be suppressed to an acceptable level with suitable cuts, and find that adding the p{sub T} b{bar b} + 4 jet channel to the final states used in previous ttZ couplings analyses will improve the sensitivity by 10-60%. We also discuss how the measurement of the ttZ couplings may constrain Little Higgs models.

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16 pages

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  • Journal Name: Phys.Rev.D73:034016,2006

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  • Report No.: FERMILAB-PUB-05-542-T
  • Grant Number: AC02-76CH03000
  • Office of Scientific & Technical Information Report Number: 879120
  • Archival Resource Key: ark:/67531/metadc880479

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Office of Scientific & Technical Information Technical Reports

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  • December 1, 2005

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 29, 2016, 2:26 p.m.

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Baur, U.; /SUNY, Buffalo; Juste, A.; /Fermilab; Rainwater, D.; Orr, L.H. et al. Improved measurement of ttZ couplings at the LHC, article, December 1, 2005; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc880479/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.