Chiral Color Symmetry and Possible G′-Boson Effects at the Tevatron and LHC

Martynov, M. V.; Smirnov, A. D.

doi:10.1142/s0217732309031296

Cited by 34 publications

(51 citation statements)

References 48 publications

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“…4 Given the TeV lower bounds on the coloron mass [20][21][22][23][24][25], we have neglected a potential decay of the s boson into a pair of colorons in (16). Furthermore, we focus our attention on the case where the spectator fermions are heavy, with M Q in the TeV range [32][33][34], such that the s decay into a pair of spectator fermions is also kinematically prohibited.…”

Section: The Heavy S Scalarmentioning

confidence: 99%

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LHC constraints on a Higgs boson partner from an extended color sector

et al. 2014

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We discuss the properties and LHC phenomenology of a potentially discoverable heavy scalar boson (s) that arises in the context of the renormalizable coloron model; the model also contains a light scalar, h, identifiable with the 125 GeV state discovered by the LHC. These two scalar mass eigenstates are admixtures of a weak doublet gauge eigenstate and a weak singlet gauge eigenstate. A previous study set exclusion limits on the heavy s scalar, using the stability of the scalar potential, unitarity, electroweak precision tests, LHC searches for the 125 GeV Higgs; it also briefly discussed the √ s = 7, 8 TeV LHC searches for a heavy Higgs. In this work, we show how the projected LHC sensitivity at √ s = 14 TeV to the presence of a heavy Higgs and to the detailed properties of the 125 GeV Higgs will further constrain the properties of the new heavy s scalar.Since the renormalizable coloron model may contain spectator fermions to remove anomalies, we examine several representative scenarios with different numbers of spectator fermions. Our results are summarized in plots that overlay the current exclusion limits on the s boson with the projected sensitivity of the √ s = 14 TeV LHC to the new state. We find that the upcoming LHC searches should be sensitive to an s scalar of mass less than 1 TeV for essentially all of the model parameter space in which the h state differs from the Higgs boson of the SM. More precisely, unless the mixing between the weak doublet and weak singlet gauge-eigenstate scalars is zero, the 14 TeV LHC will be sensitive to the presence of the non-standard heavy s state that is characteristic of the renormalizable coloron model.

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Section: The Heavy S Scalarmentioning

confidence: 99%

“…Models including topcolor [1], the flavor-universal coloron [2], chiral color [3], chiral color with unequal gauge couplings [4] and flavor non-universal chiral color [5] belong to this class of theories beyond the SM.…”

Section: Introductionmentioning

confidence: 99%

LHC constraints on a Higgs boson partner from an extended color sector

et al. 2014

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“…Massive color-octet vector bosons are predicted in a variety of models, including axigluon models [1,2], topcolor models [3][4][5][6], technicolor models with colored technifermions [7], flavor-universal [8,9] and chiral [10] coloron models, and extra-dimensional models with KK gluons [11,12]. These states have also recently been considered as a potential source [13,14] of the top-quark forward-backward asymmetry observed by the CDF collaboration [15,16].…”

Section: Introductionmentioning

confidence: 99%

Production of massive color-octet vector bosons at next-to-leading order

et al. 2012

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We report the first complete calculation of QCD corrections to the production of a massive coloroctet vector boson. Our next-to-leading-order (NLO) calculation includes both virtual corrections as well as corrections arising from the emission of gluons and light quarks, and we demonstrate the reduction in factorization-scale dependence relative to the leading-order approximation used in previous hadron collider studies. We show that the QCD NLO corrections to coloron production are as large as 30%, and that the residual factorization scale-dependence is reduced to of order 2%. We also calculate the K-factor and the pT spectrum for coloron production, since these are valuable for comparison with experiment. Our results apply directly to the production of the massive color-octet vector bosons in axigluon, topcolor, and coloron models, and approximately to the production of KK gluons in extra-dimensional models or color-octet technivector mesons in technicolor models.

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“…This rise in the asymmetry at high energy could be interpreted as further evidence of a new physics signal characterized by energies at or above the weak scale. In this work we will investigate explanations of the asymmetry based on new physics [4][5][6][7][8][9][11][12][13][14][15], examine what can be done next at the Tevatron and the LHC to either rule out or confirm as well as characterize models that explain the anomaly. An important first question is whether we should consider models that are wholly responsible for the asymmetry, or models where interference between new physics and QCD generates the asymmetry.…”

Section: Introductionmentioning

confidence: 99%

LHC predictions from a tevatron anomaly in the top quark forward-backward asymmetry

Bai

Hewett

Kaplan

et al. 2011

J. High Energ. Phys.

112

111

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Abstract:We examine the implications of the recent CDF measurement of the top-quark forward-backward asymmetry, focusing on a scenario with a new color octet vector boson at 1-3 TeV. We study several models, as well as a general effective field theory, and determine the parameter space which provides the best simultaneous fit to the CDF asymmetry, the Tevatron top pair production cross section, and the exclusion regions from LHC dijet resonance and contact interaction searches. Flavor constraints on these models are more subtle and less severe than the literature indicates. We find a large region of allowed parameter space at high axigluon mass and a smaller region at low mass; we match the latter to an SU(3) 1 × SU(3) 2 /SU(3) c coset model with a heavy vector-like fermion. Our scenario produces discoverable effects at the LHC with only 1 − 2 fb −1 of luminosity at √ s = 7 − 8 TeV. Lastly, we point out that a Tevatron measurement of the b-quark forwardbackward asymmetry would be very helpful in characterizing the physics underlying the top-quark asymmetry.

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Chiral Color Symmetry and Possible G′-Boson Effects at the Tevatron and LHC

Cited by 34 publications

References 48 publications

LHC constraints on a Higgs boson partner from an extended color sector

LHC constraints on a Higgs boson partner from an extended color sector

Production of massive color-octet vector bosons at next-to-leading order

LHC predictions from a tevatron anomaly in the top quark forward-backward asymmetry

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