Light colored scalars from grand unification and the forward-backward asymmetry in tt production

Journal Article · Mon Mar 01 00:00:00 EST 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.055009· OSTI ID:21409886

Dorsner, Ilja ^[1]; Fajfer, Svjetlana ^[2]; Kamenik, Jernej F; Kosnik, Nejc ^[3]

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1. Department of Physics, University of Sarajevo, Zmaja do Bosne 33-35, 71000 Sarajevo (Bosnia and Herzegowina)
2. Department of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana (Slovenia)
3. Jozef Stefan Institute, Jamova 39, P. O. Box 3000, 1001 Ljubljana (Slovenia)

The experimental results on the tt production cross section at the Tevatron are well described by the QCD contributions within the standard model, while the recently measured forward-backward asymmetry is larger than predicted within this framework. We consider light colored scalars appearing in a particular SU(5) grand unified theory model within the 45-dimensional Higgs representation. A virtue of the model is that it connects the presence of a light colored SU(2) singlet ({Delta}{sub 6}) and a color octet weak doublet ({Delta}{sub 1}) with bounds on the proton lifetime, which constrain the parameter space of both scalars. We find that both the total tt production cross section and the forward-backward asymmetry can be accommodated simultaneously within this model. The experimental results prefer a region for the mass of {Delta}{sub 6} around 400 GeV, while {Delta}{sub 1} is then constrained to have a mass around the TeV scale as well. We analyze possible experimental signatures and find that {Delta}{sub 6} associated top production could be probed in the tt+jets final states at Tevatron and the LHC.

• OSTI ID: 21409886
• Journal Information: Physical Review. D, Particles Fields, Vol. 81, Issue 5; Other Information: DOI: 10.1103/PhysRevD.81.055009; (c) 2010 The American Physical Society; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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