Family structure with composite quarks and leptons

Bars, Itzhak

doi:10.1016/0370-2693(81)91090-x

Cited by 31 publications

(2 citation statements)

References 8 publications

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“…It contains two kinds of massless fermion preons: the weak preon V and the family preon P. They belong to SU H (4) representations Q and D and have the hyperflavor numbers 12 and 6 respectively. The representations of V and P preons under the group SU ff (4)xG HF are listed in Table 1, where the hyperflavor group 2 Table 1 The preons' representations in a three-fermion model SU ff (4)…”

Section: Modelmentioning

confidence: 99%

Composite Quark Mass Hierarchy and FCNC Suppression

Zhou

Chang

1988

Commun. Theor. Phys.

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The observed quark mass hierarchy and the realistic mixing matrix of quark charged currents may be explained in a framework of a three-fermion composite model, if the quark masses are generated by the condensates of exotic colored fermions and in the dynamical mechanism, we incorporate the following conjecture that the four-preon hypercolor condensates, which are used to realize the spontaneous breaking of the family gauge group in the model, may correspond to two different mass scales. We also show that all the FCNC including the effective coupling in the model can be suppressed down to below the experimental limit.

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Section: Modelmentioning

confidence: 99%

Composite Quark Mass Hierarchy and FCNC Suppression

Zhou

Chang

1988

Commun. Theor. Phys.

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“…Another reason for the limited progress in studying quark and lepton compositeness is that it has been difficult even to imagine [4][5][6] how the observed patterns of SM fermion masses could arise from a strongly-coupled chiral gauge interaction acting on some elementary fermions, historically called preons. The chiral nature of the theory implies that the preons are massless, and there is no obvious source for the mass splittings between the light composite fermions, which are referred to as prebaryons and need to be identified as the quarks and leptons.…”

Section: Introductionmentioning

confidence: 99%

Proton decay from quark and lepton compositeness

Assi

Dobrescu

2022

J. High Energ. Phys.

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Within a chiral SU(15) gauge theory in which the Standard Model fermions are bound states of massless preons, we show that proton-decay operators are likely induced at the compositeness scale, Λpre. Our estimate of the limit imposed by searches for proton decays is Λpre> 104 TeV1/2$$ {C}_8^{1/4}\ {m}_{\mathcal{Q}}^{1/2} $$ C 8 1 / 4 m Q 1 / 2 , where C8 is a rescaled coefficient of an 8-prebaryon operator induced by SU(15) dynamics, and $$ {m}_{\mathcal{Q}} $$ m Q is the mass of a composite vectorlike quark. The latter has a lower limit related to the mass of a composite vectorlike lepton, which in turn is required by LHC searches to be above 1 TeV. For C8 in the 10−5 – 1 range, the lower limit on Λpre varies between 3 × 103 TeV and 5 × 104 TeV. We point out that exotic proton decay modes, into a π+ and a heavy right-handed neutrino, could be observed using the Super-Kamiokande or DUNE detectors.

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Composite models of quarks and leptons

Peccei

1983

Gauge Theories of the Eighties

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Family structure with composite quarks and leptons

Cited by 31 publications

References 8 publications

Composite Quark Mass Hierarchy and FCNC Suppression

Composite Quark Mass Hierarchy and FCNC Suppression

Proton decay from quark and lepton compositeness

Composite models of quarks and leptons

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