First observation of the Charmless Decay B to K pi0pi0 and Study of its Dalitz Plot Structure Page: 67 of 201
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2.8. Trigger and data acquisition
2.8 Trigger and data acquisition
The basic requirement of the trigger system is the selection of events of interest
with high, stable and well-understood efficiency while rejecting beam-induced back-
grounds. The total trigger efficiency is required to be greater than 99% for all BB
events and at least 95% for continuum events. Less stringent requirements apply to
other event types, such as +T events, which only need between 90 -95% efficiency
depending on specific channels.1 hilj 134 rn .
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HIFigure 2.13: Simplified L1 trigger schematic. Indicated in the figure are the
number of components and the transmission rates between them in terms of
signal bits. /481
The trigger system is implemented in two stages: the Level 1 (Li) trigger in hardware
followed by the Level 3 (L3) in software. The Li trigger data is processed by three
different hardware structures: the DCH trigger (DCT), the EMC trigger (EMT) and
the IFR trigger (IFT). Each Li trigger receives information indicating the presence38
38
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Puccio, Eugenia Maria Teresa Irene & /SLAC, /Warwick U. First observation of the Charmless Decay B to K pi0pi0 and Study of its Dalitz Plot Structure, thesis or dissertation, March 21, 2012; United States. (https://digital.library.unt.edu/ark:/67531/metadc830373/m1/67/?q=%22Irene%22: accessed June 8, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.