THE CHIRAL COLOR SYMMETRY OF QUARKS AND G′-BOSON CONTRIBUTIONS TO CHARGE ASYMMETRY IN $t \bar t$-PRODUCTION AT THE LHC AND TEVATRON

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

doi:10.1142/s0217732313500351

Cited by 2 publications

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“…A t F B has been measured at LHC [32] and even though the presently available data have rather large errors, one still notices deviations between the central values of the measured asymmetry and the SM prediction. Many authors proposed various models BSM [33][34][35] to re-predict the asymmetry, more precise measurements are badly needed. In fact at the hadron colliders the signals might be contaminated by the rather messy background, so that it is hard to draw a definite conclusion about contributions of new physics.…”

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confidence: 99%

Constraining parameter space of the little Higgs model using data from tera-Z factory and ILC

et al. 2015

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The Standard Model prediction on the forward-backward asymmetry for bb production (A b F B ) is well consistent with the data of LEP I at the Z-pole, but deviates from the data at √ s = 89 93GeV which are slightly away from the pole. This deviation implies that there still is room for new physics. We calculate the A b F B at vicinity of Z-pole in the Little Higgs Model as well as other measurable parameters such as R b and R c , by which we may constrain the parameter space of the Little Higgs Model. This can be tested in the newly proposed tera-Z factory. With the fitted parameters we further make predictions on A b F B and A t F B for tt production at the ILC energy.

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Section: Fig2 Andmentioning

confidence: 99%

Constraining parameter space of the little Higgs model using data from tera-Z factory and ILC

et al. 2015

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“…In particular G ′ -boson could give rise at the LHC to the charge asymmetry of t t production as well as to the appearance of a resonant peak in the invariant mass spectrum of dijet events. The possible effect of G ′ -boson on the charge asymmetry of t t production at the LHC (and at the Tevatron) and the corresponding G ′ -boson mass limits have been discussed in [6][7][8][9].…”

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Mass limits for the chiral color symmetry G′-boson from LHC dijet data

Frolov

Smirnov

2016

Mod. Phys. Lett. A

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The contributions of G ′ -boson predicted by the chiral color symmetry of quarks to the differential dijet cross-sections in pp-collisions at the LHC are calculated and analysed in dependence on two free parameters of the model, the G ′ mass m G ′ and mixing angle θ G . The exclusion and consistency m G ′ − θ G regions imposed by the ATLAS and CMS data on dijet cross-sections are found. Using the CT10 (MSTW 2008) PDF set we show that the G ′ -boson for θ G = 45 • , i.e. the axigluon, with the masses m G ′ < 2.3 (2.6) TeV and m G ′ < 3. 35 (3.25) TeV is excluded at the probability level of 95% by the ATLAS and CMS dijet data respectively. For the other values of θ G the exclusion limits are more stringent. The m G ′ − θ G regions consistent with these data at CL = 68% and CL = 90% are also found.Keywords: New physics; chiral color symmetry; axigluon; massive color octet; G ′ -boson; dijet cross section.The search for the possible effects of new physics beyond the Standard Model (SM) is now one of the main goals of the experiments at the LHC. By now there are many models predicting new particles which can manifest themselves at the LHC energy through the possible new physics effects. Among such particles there are new quarks and leptons of the fourth generation of fermions, supersymmetric particles of the supersymmetry models, new scalar particles of two Higgs models, new gauge bosons of the weak left-right symmetry model, gauge and scalar leptoquarks of the four color quark-lepton symmetry models, etc. The unobservation of the new physics effects induced by these particles at the LHC will set new limits on the parameter of corresponding models.One of such models which also predict new particles and can induce the new physics effects at the LHC energy is based on the gauge group of the chiral color symmetry of quarkswhich is assumed to be valid at high energies and is spontaneously broken to usual QCD SU c (3) at some low energy scale M chc . The idea of the originally chiral character of SU

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THE CHIRAL COLOR SYMMETRY OF QUARKS AND G′-BOSON CONTRIBUTIONS TO CHARGE ASYMMETRY IN $t \bar t$-PRODUCTION AT THE LHC AND TEVATRON

Cited by 2 publications

References 25 publications

Constraining parameter space of the little Higgs model using data from tera-Z factory and ILC

Constraining parameter space of the little Higgs model using data from tera-Z factory and ILC

Mass limits for the chiral color symmetry G′-boson from LHC dijet data

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