2008/06/14 by Matthew J. Strassler, Strassler, Matthew J. · 5 citations
Earth and Planetary Sciences · Environmental Science · Physics and Astronomy · #Environmental Changes in China #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th) #Remote Sensing and Land Use #hep-ex #hep-ph #hep-th
paper · pdf · doi:10.48550/arxiv.0806.2385
23 pages, 39 figures
arxiv created 2008/06/14 · openalex publication_date 2008/06/14 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.