Search for single top quark production at D0 in Run II

Schwienhorst, Reinhard ; U., /Michigan State

Fermi National Accelerator Laboratory

关键词: T Quarks Experiment-Hep;    Decay;    Fermilab Tevatron;    T Channel;    S Channel;   

DOI  :  10.2172/907796
RP-ID  :  FERMILAB-FN-0795-E
RP-ID  :  AC02-07CH11359
RP-ID  :  907796

美国|英语

来源: UNT Digital Library

【 摘 要 】

I present a comprehensive search for electroweak production of single top quarks in Run II at the Fermilab Tevatron at {radical}s =1.96TeV. Using 230 pb{sup -1} of data collected with the D0 experiment, searches for s-channel and t-channel single top quark production have been carried out in the electron+jets and muon+jets decay channels using secondary-vertex b-quark tagging to select signal-like events. A binned likelihood has been constructed from the outputs of neural networks in order to maximize the sensitivity to single top quark production. No evidence for a single top quark signal is found. However, the 95% confidence level upper limits on the production cross section of 6.4 pb in the s-channel and 5.0 pb in the t-channel are improvements over previous limits by a factor of two and are approaching the cross section region predicted by the standard model.