20,359 research outputs found

    Fermionic decays of scalar leptoquarks and scalar gluons in the minimal four color symmetry model

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    Fermionic decays of the scalar leptoquarks S=S1(+),S1(),Sm S=S_1^{(+)}, S_1^{(-)}, S_m and of the scalar gluons F=F1,F2F=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 S1(+)tlj+,S1()νib~,Smtν~j,F1tb~,F2tt~ S_1^{(+)}\to tl^+_j, S_1^{(-)}\to \nu_i\tilde b, S_m\to t\tilde \nu_j, F_1\to t\tilde b, F_2\to t\tilde t are dominant with the widths of order of a few GeV for mS,mF<1m_S, m_F<1 TeV and with the total branching ratios close to 1. In the case of mS<mtm_S < m_t the dominant scalar leptoquark decays are S_1^{(+)}\to cl_j^+, S_1^{(-)}\to \nu_i\tilde b, S_m\to b\l_j^+, S_m\to c\tilde \nu_j with the total branching ratios Br(S1(+)cl+)Br(S_1^{(+)}\to cl^+) \approx Br(S1()νb~)1Br(S_1^{(-)}\to \nu\tilde b) \approx 1, Br(Smbl+)0.9Br(S_m\to bl^+) \approx 0.9 and Br(Smcν~)0.1.Br(S_m\to c\tilde \nu) \approx 0.1. A search for such decays at the LHC and Tevatron may be of interest.Comment: 11 pages, 1 figure, 1 table, to be published in Modern Physics Letters

    On a possible manifestation of the four color symmetry ZZ' boson in μ+μ\mu^+\mu^- events at the LHC

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    The cross section of the μ+μ\mu^+\mu^- pair production in pppp-collisions at the LHC is calculated with acount of the ZZ' boson induced by the minimal four color quark-lepton symmetry(MQLSMQLS). The μ+μ\mu^+\mu^- invariant mass spectrum with account of the MQLSMQLS ZZ' boson is analysed in dependence on the ZZ' mass. The mass region for the MQLSMQLS ZZ' boson observable at the LHC is found in dependence on the significance and on the integrated luminosity.Comment: 11 pages, 2 figures, accepted for publication in Modern Physics Letters
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