Singlet charge 2/3 quark hiding the top quark: Fermilab Tevatron and CERN LEP implications

Journal Article · Mon May 01 00:00:00 EDT 1995 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.51.5285· OSTI ID:44790

Hou, W ^[1]; Huang, H ^[1]

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1. Department of Physics, National Taiwan University, Taipei, Taiwan 10764 (Taiwan, Province of China)

If {ital c} and {ital t} quarks are strongly mixed with a weak singlet charge 2/3 quark, {ital B}({ital t}{r_arrow}{ital l}{nu}+{ital X}) could be suppressed via the {ital t}{r_arrow}{ital cH}{sup 0} mode; thereby, the top quark could still hide below {ital M}{sub {ital W}}, whereas the heavy quark signal observed at the Fermilab Tevatron is due to the dominantly singlet quark {ital Q}. This may occur without affecting the small {ital m}{sub {ital c}} value. Demanding {ital m}{sub {ital Q}}{congruent}175 GeV and {ital m}{sub {ital t}}{approx_lt}{ital M}{sub {ital W}}, we find that {ital B}({ital t}{r_arrow}{ital l}{nu}+{ital X}) cannot be too suppressed. The heavy quark {ital Q} decays via {ital W}, {ital H}, and {ital Z} bosons. The latter can lead to {ital b}-tagged {ital Z}+4 jet events, while the strong {ital c}-{ital Q} mixing is reflected in a sizable {ital Q}{r_arrow}{ital sW} fraction. {ital Z}{r_arrow}{ital t{bar c}} decay occurs at the tree level and may be at the 10{sup {minus}3} order, leading to the signature of {ital Z}{r_arrow}{ital l}{nu}{ital b{bar c}}, all isolated and with large {ital p}{sub {ital T}}, at 10{sup {minus}5} order.

• OSTI ID: 44790
• Journal Information: Physical Review, D, Vol. 51, Issue 9; Other Information: PBD: 1 May 1995
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
TOP PARTICLES
SEMILEPTONIC DECAY
BRANCHING RATIO
CHARM PARTICLES
QUARKS
MIXING
FERMILAB TEVATRON