HighpTtop quarks at the CERN Large Hadron Collider

2007/07/13 by U. Baur, L. H. Orr · 2 citations
Physics and Astronomy · #Hadron #High-Energy Particle Collisions Research #Invariant mass #Order (exchange) #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quark #hep-ph

paper · pdf · doi:10.1103/physrevd.76.094012

published as Phys.Rev.D76:094012,2007 · revtex 3, 39 pages, 18 figures

arxiv created 2007/07/13 · openalex publication_date 2007/11/09 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

Many new physics models predict resonances with masses in the TeV range which decay into a pair of top quarks. With its large cross section, tt production at the Large Hadron Collider (LHC) offers an excellent opportunity to search for such particles. The identification of very energetic top quarks is crucial in such an analysis. We consider in detail the tt\ensuremath→\ensuremathℓ^\ifmmode±\else\textpm\fi\ensuremathνbbqq^\ensuremath' (\ensuremathℓ=e,\ensuremathμ) final state for high p_T top quarks. In this phase space region, two or more of the final state quarks can merge into a single jet due to the large Lorentz boost of the parent top quark. As a result, a large fraction of tt\ensuremath→\ensuremathℓ^\ifmmode±\else\textpm\fi\ensuremathνbbqq^\ensuremath' events with an invariant mass in the TeV region contains less than four observable jets. Requiring one or two tagged b-quarks, we calculate the W+jets, Wb+jets, Wbb+jets, Wbt, and single top plus jets backgrounds for these final states, and identify cuts which help to suppress them. In particular, we discuss whether a cut on the jet invariant mass may be useful in reducing the background in the \ensuremathℓ\ensuremathν+2 jets channel. We also investigate how next-to-leading-order QCD corrections affect high p_T top quark production at the LHC. We find that the \ensuremathℓ\ensuremathν+2 jets and \ensuremathℓ\ensuremathν+3 jets final states with one or two b-tags will significantly improve the chances for discovering new heavy particles in the tt channel at the LHC.

Citations

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Cited by

• Identification of Extra Neutral Gauge Bosons at the LHC UsingbandtQuarks
• Flavor-violation tests of the warped/composite standard model in the two-site approach