Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-06-14
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, 39 figures
Scientific paper
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 $Z'$ 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 ($R$=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.
No associations
LandOfFree
On the Phenomenology of Hidden Valleys with Heavy Flavor does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On the Phenomenology of Hidden Valleys with Heavy Flavor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the Phenomenology of Hidden Valleys with Heavy Flavor will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-258037