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Level 2 The Level 2 trigger uses custom hardware to do a limited event reconstruction which can be processed in programmable processors. The Level 2 trigger consists of several asynchronous subsystems which provide input data to programmable Level 2 Processors in the Global Level2 crate. The r ✬➈✉ information from the silicon detector are used at this level. Level 3 The Level 3 trigger is a farm of about 200 Linux PCs. There complete events are built and more sophisticated algorithms classify events.

2➇ Min. 0 GeV Multiple scattering res. 2: Design parameters of the CDF II Muon Detectors. Pion interaction lengths and multiple scattering are computed at a reference angle of ✮①✆ 90✰ in CMU and CMP✞ CSP, at an angle of ✮✯✆ 55✰ in CMX✞ CSX, and show the range of values for the IMU. 28 The hardware consists of three parallel synchronous processing streams which feed inputs of the single Global Level-1 decision unit. One stream finds calorimeter based objects, another finds muons while the third finds tracks in the COT.

The data sample triggered without the opening angle requirement is used to the measurement of the cross section for the J➱✄✃ s which have transverse momentum range of 0 - 2 GeVÒ c, because of the masses of J➱✢✃ and muon, m JØÚÙÜÛ 3 Ñ 097 GeVÒ c2 and mÝ Û 0 Ñ 106 GeVÒ c2 and the trigger requirement of pT Þ 1 Ñ 5 by the XFT. 2 Good run selection To make the measurement robust, only “good runs” which are considered good enough for the measurement, are analyzed. To be a good run, the run must be tagged by online shift operators and oà ine production operators.