Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-01-14
Phys.Rev.D84:011505,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, 2 figures and 2 tables. v2: Added a Monte Carlo estimation of the QCD background and some other minor correction. v3:
Scientific paper
10.1103/PhysRevD.84.011505
The CDF collaboration recently reported an upper limit on boosted top pair production and noted a significant excess above the estimated background of events with two ultra-massive boosted jets. We discuss the interpretation of the measurement and its fundamental implications. In case new physics is involved, the most naive contribution is from a new particle produced with a cross section that is a few times higher than that of the top quark and a sizable hadronic branching ratio. We quantify the resulting tension of a possible larger top pair cross section with the absence of excess found in events with one massive boosted jet and missing energy. The measured planar flow distribution shows deviation from CDF's Pythia QCD prediction at high planarity, while we find a somewhat smaller deviation when comparing with other Monte Carlo tools. As a simple toy model, we analyze the case of a light gluino with R-parity violation and show that it can be made consistent with the data.
Eshel Yochay
Gedalia Oram
Perez Gilad
Soreq Yotam
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