Diquark resonance and single top production at the Large Hadron Collider
arXiv:1201.2917 · doi:10.1103/PhysRevD.85.075011
Abstract
New physics at the TeV scale is highly anticipated at the LHC. New particles with color, if within the LHC energy reach, will be copiously produced. One such particle is a diquark, having the quantum numbers of two quarks, and can be a scalar or a vector. It will decay to two light quarks, or two top quarks, or a top and a light quark, (up or down type depending on the quantum number of the produced diquark). If singly produced, it can be looked for as a dijet resonance, or as giving extra contribution to the single top production or tt production. In this work, we consider a color sextet vector diquark having the quantum number of (ud) type, its resonance production, and the subsequent decay to tb, giving rise to excess contribution to the single top production. Even though the diquark mass is large, its strong resonance production dominate the weak production of tb for a wide range of the diquark mass. Also its subsequent decay to tb produce a very hard b-jet compared to the usual electroweak production. In addition, the missing energy in the final state event is much larger from the massive diquark decays. Thus, with suitable cuts, the final state with b, bar{b} and a charged lepton together with large missing energy stands out compared to the Standard Model background. We make a detailed study of both the signal and the background. We find that such a diquark is accessible at the 7 TeV LHC upto a mass of about 3.3 TeV with the luminosity 1 fb^{-1}, while the reach goes up to about 4.3 TeV with a luminosity of 10 fb^{-1}.
19 pages, 16 eps figures
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Cited by in corpus (8)
- Baryon Number and Lepton Universality Violation in Leptoquark and Diquark Models
- LHC Constraints on Scalar Diquarks
- Single Top Production as a Probe of Heavy Resonances
- Threshold resummation for the production of a color sextet (antitriplet) scalar at the LHC
- Light axigluon and single top production at the LHC
- NLO QCD corrections to the resonant Vector Diquark production at the LHC
- Improving Heavy Dijet Resonance Searches Using Jet Substructure at the LHC
- Transverse momentum resummation for color sextet and antitriplet scalar production at the LHC