Z0 Z0 cross section measurement in llνν decay channel at CDF Public Page

Authors: Matteo Bauce, Donatella Lucchesi, Simone Pagan Griso, Maria d'Errico, Doug Benjamin, Mark Kruse, Seog Oh, Geum Bong Yu, Massimo Casarsa, Eric James, Sergo Jindariani, Tom Junk, Britney Rutherford, Roman Lysak, Anadi Canepa, Dean Andrew Hidas, Aidan Robson, Rick St. Denis, Peter Bussey,Matthew Herndon, Jason Nett, Jennifer Pursley Contacts: Matteo Bauce and Donatella Lucchesi

The Z⁰Z⁰ cross section measurement is important to test Standard Model predictions of Electro-Weak couplings. Deviations from the expected value can be due to new physics that can contribute through the anomalous trilinear gauge couplings and large extra-dimensions. In addition to that the Z⁰Z⁰ reconstruction is important to set the scale for the H→ZZ search. We aim at the determination of Z⁰Z⁰ production cross section and at the reconstruction of a sizeable diboson sample through the llνν decay channel. The analysis that uses 5.9 fb^-1 of data, starts from dilepton events selection. A Neuro Bayes Neural Network technique is used to discriminate signal from background, after the removal of the Drell Yan events background with a cut on the minimum missing energy. The measured Z⁰Z⁰ cross section is 1.45^+0.60_-0.51 pb, in agreement with the Standard Model prediction 1.21^0.06_-0.05 pb at Next to Leading Order. This measurement improves the previous CDF combined Z⁰Z⁰ production cross section measurement.

Supporting Documents

Public note

Plots and tables for presentations and analysis description

Link to the previous Z⁰ Z⁰ →lll'l' analysis

The results should be considered preliminary until published in a refereed journal. They can be used in conference presentations with proper reference to the CDF Collaboration.