Hunting for CDF Multi-Muon Ghost Events at Collider and Fixed-Target Experiments - High Energy Physics - PhenomenologyReport as inadecuate




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Abstract: In 2008 the CDF collaboration discovered a large excess of events containingtwo or more muons, at least one of which seemed to have been produced outsidethe beam pipe. We investigate whether similar -ghost- events could and shouldhave been seen in already completed experiments. The CDF di-muon data can bereproduced by a simple model where a relatively light X particle undergoesfour-body decay. This model predicts a large number of ghost events in Fermilabfixed-target experiments E772, E789 and E866, applying the cuts optimized foranalyses of Drell-Yan events. A correct description of events with more thantwo muons requires a more complicated model, where two X particles are producedfrom a very broad resonance Y. This model can be tested in fixed-targetexperiments only if the cut on the angles, or rapidities, of the muons can berelaxed. Either way, the UA1 experiment at the CERN ppbar collider should haveobserved O100 ghost events.



Author: Nicki Bornhauser, Manuel Drees

Source: https://arxiv.org/







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