The minimal quark-lepton symmetry model and the limit on Z′-mass

Smirnov, A. D.

doi:10.1016/0370-2693(95)00015-d

Cited by 47 publications

(26 citation statements)

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“…They couple to lepton-quark pairs and appear in many extensions of the Standart Model (SM) which unify lepton and quark in one multiplet in the framework Grand United Theory (GUT) on grounds that S U(5) [2] and S U(4) [1], superstring-inspired E6 model and other models. We study leptoquarks in the minimal extension SM with four color symmetry, that is Minimal Quark-Lepton Symmetry model (MQLS model) [3,4]. The MQLS model predicted the existence of the vector leptoquarks with masses on the order of the mass scale, which S U c (4) symmetry is broken.…”

Section: Introductionmentioning

confidence: 99%

The parameters of the fermion-mixing and search restriction on a mass leptoquark.

Povarov

2017

EPJ Web Conf.

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Section: Introductionmentioning

confidence: 99%

The parameters of the fermion-mixing and search restriction on a mass leptoquark.

Povarov

2017

EPJ Web Conf.

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“…where the first factor is the vector-like group of the four color quark-lepton symmetry the second one is the usual SM electroweak symmetry group for the left-handed fermions and the third one is the corresponding hypercharge factor for the right-handed fermions (the minimal quark-lepton symmetry model -MQLS-model [2,3]). As a remarkable consequence the four color quark-lepton symmetry predicts for the electric charges of quarks and leptons the simple expression…”

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Resonance contribution of scalar color octet to tt̄ production at the LHC in the minimal four-color quark–lepton symmetry model

2016

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The scalar color octet contribution to the resonance tt-pair production at the LHC is calculated and analysed with account of the one loop effective two gluon vertex. It is shown that this contribution from the scalar color octet F 2 predicted by the minimal model with the four color quark-lepton symmetry is for √ s = 13 TeV of about a few percents for 750 < m F 2 < 1800 GeV and can exceed 10% for 400 < m F 2 < 750 GeV. It is also pointed out that the search for the scalar octet F 2 as the resonance in the dijet mass spectra seems to be difficult because of the smallness of its one loop effective two gluon interaction.Keywords: Beyond the SM; four color symmetry; scalar octet; scalar gluon; top quark physics. PACS number: 12.60.-iThe search for new physics effects beyond the Standard Model (SM) is now one of the goals of the experiments at the LHC. There are many models predicting new physics effects. The most interesting of them look the models predicting new effects due to enlarging the symmetry of the SM because the search for such effects could help us to find the next symmetry in yet unknown hierarchy of the symmetries which possibly unify the known in the SM electroweak and strong interactions of quarks and leptons.One of such variant of new physics beyond the SM can be induced by the possible four color symmetry between quarks and leptons of Pati-Salam type [1]. The four color quark-lepton symmetry can be unified with the electroweak SU L (2)×U(1) symmetry of the SM in the minimal way by the groupwhere the first factor is the vector-like group of the four color quark-lepton symmetry the second one is the usual SM electroweak symmetry group for the left-handed fermions *

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“…* E-mail: popov p@univ.uniyar.ac.ru † E-mail: povarov@univ.uniyar.ac.ru ‡ E-mail: asmirnov@univ.uniyar.ac.ru 1 It should be noted however that in addition to the gauge leptoquarks the four color symmetry can predict also the new scalar particles. Thus, in the case of the Higgs mechanism of splitting the masses of quarks and leptons the four color symmetry in its minimal realization on the gauge group(MQLS-model [2,3]) needs the existence of the scalar particles belonging to the (15,2,1) -multiplet of the group G. This multiplet contains fifteen scalar SU L (2)-doublets: two scalar leptoquark doublets S (±) , scalar gluon doublet F and a SU c (3)-colorless scalar doublet which in admixture with the (1, 2, 1) -doublet forms the SM Higgs doublet Φ (SM ) and an additional colorless scalar doublet Φ ′ . All these scalar doublets are necessary [4] for splitting the the masses of quarks from those of leptons by the Higgs mechanism and for generating the quark -lepton mass splittings including the so large mass splittings as the b − τ and t − ν τ ones.…”

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“…The Higgs mechanism of the quark-lepton mass splitting needs, in general, two scalar multiplets Φ (2) …”

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Fermionic Decays of Scalar Leptoquarks and Scalar Gluons in the Minimal Four-Color Symmetry Model

2005

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Fermionic decays of the scalar leptoquarks S = S (+) 1 , S (−) 1 , S m and of the scalar gluons F = F 1 , F 2 predicted by the four color symmetry model with the Higgs mechanism of the quark-lepton mass splitting are investigated. Widths and branching ratios of these decays are calculated and analysed in dependence on coupling constants and on masses of the decaying particles. It is shown that the decays S One of the goals of the forthcoming experiments at LHC (in addition to the search for the Higgs boson and to the further studies of the Standard Model (SM)) will be the search for the possible effects of the new physics beyond the SM. There is a lot of the variants of new physics beyond the SM predicting new effects at energies of LHC (supersymmetry, left -right symmetry, two Higgs model, etc.).One of such variants can be the variant induced by the possible four color symmetry between quarks and leptons of Pati-Salam type [1]. The immediate consequence of this symmetry is the prediction of the gauge leptoquarks which, however, occur to be relatively heavy (for example, the resulted from the unobservation of the K 0 L → µ ± e ∓ decays the most stringent lower mass limit for the vector leptoquarks is of order of 10 3 TeV). By this reason it is usually thought that the effects of the four color symmetry at the colliders energies are too small to be directly detectable in the collider experiments of the near future. * E-mail: popov p@univ.uniyar.ac.ru † E-mail: povarov@univ.uniyar.ac.ru ‡ E-mail: asmirnov@univ.uniyar.ac.ru 1 It should be noted however that in addition to the gauge leptoquarks the four color symmetry can predict also the new scalar particles. Thus, in the case of the Higgs mechanism of splitting the masses of quarks and leptons the four color symmetry in its minimal realization on the gauge group(MQLS-model [2,3]) needs the existence of the scalar particles belonging to the (15,2,1) -multiplet of the group G. This multiplet contains fifteen scalar SU L (2)-doublets: two scalar leptoquark doublets S (±) , scalar gluon doublet F and a SU c (3)-colorless scalar doublet which in admixture with the (1, 2, 1) -doublet forms the SM Higgs doublet Φ (SM ) and an additional colorless scalar doublet Φ ′ . All these scalar doublets are necessary [4] for splitting the the masses of quarks from those of leptons by the Higgs mechanism and for generating the quark -lepton mass splittings including the so large mass splittings as the b − τ and t − ν τ ones.Because of their Higgs origin the coupling constants of these scalar doublets with the fermions are proportional to the ratios m f /η of the fermion masses m f to the SM VEV η. The effects of these scalar leptoquarks in the processes with the ordinary u-, d-, s-quarks are small because of the smallness of the corresponding coupling constants(but these effects can be significant in c-, b-and, especially, in top-physics m c /η ∼ m b /η ∼ 10 −2 , m t /η ∼ 0.7). As a result the scalar leptoquark doublets S (±) and the scalar gluon doublet F can be relative...

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The minimal quark-lepton symmetry model and the limit on Z′-mass

Cited by 47 publications

References 9 publications

The parameters of the fermion-mixing and search restriction on a mass leptoquark.

The parameters of the fermion-mixing and search restriction on a mass leptoquark.

Resonance contribution of scalar color octet to tt̄ production at the LHC in the minimal four-color quark–lepton symmetry model

Fermionic Decays of Scalar Leptoquarks and Scalar Gluons in the Minimal Four-Color Symmetry Model

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