The discovery of the fourth family at the LHC: what if?

Details The discovery of the fourth family at the LHC: what if? The discovery of the fourth family at the LHC: what if?

2006-06-13

arxiv.org/abs/hep-ph/0606146v2

JHEP 0608 (2006) 076

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 1 figure, now matches published version

Scientific paper

10.1088/1126-6708/2006/08/076

The first evidence of new strong interactions may be a sufficiently massive fourth family observed at the LHC. The fourth family masses, of the leptons in particular, are constrained by the electroweak precision data, and this leads to signatures at the LHC that may imply early discovery. We study the implications of this discovery from a bottom-up perspective, where effective 4-fermion operators model the dominant effects of the new dynamics. We identify simple approximate symmetries of these operators that may be required for realistic masses of the third and fourth families. The large top mass for instance is related to the structure of these operators.

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