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

Abstract

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 $S_1^{(+)}\to t{l}_j^{+},S_1^{(-)}\to {\nu }_i\tilde{b},S_m\to t{\tilde{\nu }}_j,F_1\to t\tilde{b},F_2\to t\tilde{t}$ are dominant with the widths of order of a few GeV for $m_S,m_F<1$ TeV and with the total branching ratios close to 1. In the case of $m_S<m_t$ the dominant scalar leptoquark decays are $S_1^{(+)}\to c{l}_j^{+},S_1^{(-)}\to {\nu }_i\tilde{b},S_m\to b{\text{l}}_j^{+},S_m\to c{\tilde{\nu }}_j$ with the total branching ratios $Br(S_1^{(+)}\to c{l}^{+})\approx$ $Br(S_1^{(-)}\to \nu \tilde{b})\approx 1$, $Br(S_m\to b{l}^{+})\approx 0.9$ and $Br(S_m\to c\tilde{\nu })\approx \mathrm{0.1.}$ A search for such decays at the LHC and Tevatron may be of interest.

Comments: 11 pages, 1 figure, 1 table, to be published in Modern Physics Letters A