Singlet Charge $2/3$ Quark hiding the Top: Tevatron and LEP Implications

Details Singlet Charge $2/3$ Quark hiding the Top: Tevatron and LEP Implications Singlet Charge $2/3$ Quark hiding the Top: Tevatron and LEP Implications

1994-09-05

arxiv.org/abs/hep-ph/9409227v1

Phys.Rev. D51 (1995) 5285-5288

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages + 3 Figures (not included), ReVTeX, NTUTH-94-18

Scientific paper

10.1103/PhysRevD.51.5285

If $c$ and $t$ quarks are strongly mixed with a weak singlet charge $2/3$ quark, $BR(t\to \ell\nu + X)$ could be suppressed via the $t\to cH^0$ mode, thereby the top quark could still hide below $M_W$, whereas the heavy quark signal observed at the Tevatron is due to the dominantly singlet quark $Q$. This may occur without affecting the small $m_c$ value. Demanding $m_Q \simeq 175$ GeV and $m_t \ltap M_W$, we find that $BR(t\to \ell\nu + X)$ cannot be too suppressed. The heavy quark $Q$ decays via $W,\ H$, and $Z$ bosons. The latter can lead to $b$-tagged $Z + 4$ jet events, while the strong $c$--$Q$ mixing is reflected in sizable $Q\to sW$ fraction. $Z\to t\bar c$ decay occurs at tree level and may be at the $10^{-3}$ order, leading to the signature of $Z\to \ell\nu b\bar c$, all isolated and with large $p_T$, at $10^{-5}$ order.

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