On the Phenomenology of Hidden Valleys with Heavy Flavor
Jun, 2008Citations per year
Abstract: (arXiv)
A preliminary investigation of a large class of Hidden Valley models is presented. These models are more challenging than those considered in arXiv:0712.2041 [hep-ph]/ although they produce a new light resonance which decays to heavy standard model fermions, they exhibit no light dilepton resonance. A heavy decaying to v-hadrons, which in turn decay mainly to bottom quarks and tau leptons, is considered/ six case studies are investigated, using a new Monte Carlo simulation package. It is found that the one-to-one correspondence of jets and partons is badly broken, and the high-multiplicity heavy-flavor signal probably cannot be isolated by counting jets, with or without heavy-flavor tags. Instead, other measures, such as counting and correlating vertices or displaced tracks, and possibly counting of (non-isolated) muons and use of event-shape variables, should be combined with scalar transverse energy and/or missing transverse energy to reduce backgrounds. Within the resulting sample, searches for the v-pion mass resonance in both di-jet and single-jet invariant mass can help confirm a signal. The best observable in a perfect calorimeter seems to be single-jet invariant mass for jets of larger radius (=0.7), although this needs further study in a realistic setting. A more detailed signal-to-background study is needed as a next step, but will face the difficulty of estimating the various high-multiplicity backgrounds.- p p: interaction
- new particle: hadroproduction
- new particle: decay
- Z'
- bottom
- multiplicity: high
- gauge field theory: SU(3) x SU(2) x U(1) x U(1) x SU(3)
- jet: multiplicity
- event shape analysis
- transverse energy: missing-energy
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