Search for New Heavy Particles Decaying to Z0 Z0 to Llll, Lljj in P Pbar Collisions at Sqrt(s)
Author | : |
Publisher | : |
Total Pages | : |
Release | : 2011 |
ISBN-10 | : OCLC:727185808 |
ISBN-13 | : |
Rating | : 4/5 (08 Downloads) |
Book excerpt: We report on a search for anomalous production of Z pairs through a massive resonance decay in data corresponding to 2.5-2.9 fb−1 of integrated luminosity in p{bar p} collisions at √s = 1.96 TeV using the CDF II detector at the Fermilab Tevatron. This analysis, with more data and channels where the Z bosons decay to muons or jets, supersedes the 1.1 fb−1 four-electron channel result previously published by CDF. In order to maintain high efficiency for muons, we use a new forward tracking algorithm and muon identification requirements optimized for these high signal-to-background channels. Predicting the dominant backgrounds in each channel entirely from sideband data samples, we observe four-body invariant mass spectra above 300 GeV/c2 that are consistent with background. We set limits using the acceptance for a massive graviton resonance that are 7-20 times stronger than the previously published direct limits on resonant ZZ production.