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Quirks at the Tevatron and beyond

2011; American Physical Society; Volume: 84; Issue: 3 Linguagem: Inglês

10.1103/physrevd.84.035029

1550-7998

Roni Harnik, Graham D. Kribs, A. Martin,

High-Energy Particle Collisions Research

We consider the physics and collider phenomenology of quirks that transform nontrivially under QCD color, $SU(2{)}_{W}$ as well as an $SU(N{)}_{ic}$ infracolor group. Our main motivation is to show that the recent $Wjj$ excess observed by CDF naturally arises in quirky models. The basic pattern is that several different quirky states can be produced, some of which $\ensuremath{\beta}$ decay during or after spin-down, leaving the lightest electrically-neutral quirks to hadronize into a meson that subsequently decays into gluon jets. We analyze LEP II, Tevatron, UA2, and electroweak precision constraints, identifying the simplest viable models: scalar quirks (``squirks'') transforming as color triplets, $SU(2{)}_{W}$ triplets and singlets, all with vanishing hypercharge. We calculate production cross sections, weak decay, spin-down, meson decay rates, and estimate efficiencies. The novel features of our quirky model includes: quirkonium decay proceeds into a pair of gluon jets, without a $b$-jet component; there is essentially no associated $Zjj$ or $\ensuremath{\gamma}jj$ signal; and there are potentially new (parameter-dependent) contributions to dijet production, multi-$W$ production plus jets, $W\ensuremath{\gamma}$, $\ensuremath{\gamma}\ensuremath{\gamma}$ resonance signals, and monojet signals. There may be either underlying event from low energy QCD deposition resulting from quirky spin-down and/or qualitatively modified event kinematics from infraglueball emission.