A new CMS Tracker is under development for operation at the High Luminosity LHC from 2026 onwards. It includes an outer tracker based on dedicated modules that will reconstruct shorttracksegments, calledstubs, usingspatiallycoincidentclustersintwocloselyspacedsilicon sensorlayers. Thesemodulesallowtherejectionoflowtransversemomentumtrackhitsandreduce thedatavolumebeforetransmissiontothefirstleveltrigger. Theinclusionoftrackinginformation in the trigger decision is essential to limit the first level trigger accept rate. A customized frontend readout chip, the CMS Binary Chip (CBC), containing stub finding logic has been designed for this purpose. A prototype module, equipped with the CBC chip, has been constructed and operated for the first time in a 4GeV/c positron beam at DESY. The behaviour of the stub finding was studied for different angles of beam incidence on a module, which allows an estimate of the sensitivitytotransversemomentumwithinthefutureCMSdetector. Asharptransversemomentum thresholdaround2GeV/c wasdemonstrated,whichmeetstherequirementtorejectalargefraction of low momentum tracks present in the LHC environment on-detector. This is the first realistic demonstration of a silicon tracking module that is able to select data, based on the particle’s transverse momentum, for use in a first level trigger at the LHC. The results from this test are describedhere.
Test beam demonstration of silicon microstrip modules with transverse momentum discrimination for the future CMS tracking detector
ALUNNI SOLESTIZI, LUISA;Biasini, M.;Cecchi, C.;CIANGOTTINI, DIEGO;Fanò, L.;Ionica, M.;LEONARDI, ROBERTO;Manoni, E.;Mantovani, G.;Marconi, S.;MARIANI, VALENTINA;MODAK, ATANU;Morozzi, A.;Passeri, D.;Placidi, P.;Rossi, A.;Santocchia, A.;
2018
Abstract
A new CMS Tracker is under development for operation at the High Luminosity LHC from 2026 onwards. It includes an outer tracker based on dedicated modules that will reconstruct shorttracksegments, calledstubs, usingspatiallycoincidentclustersintwocloselyspacedsilicon sensorlayers. Thesemodulesallowtherejectionoflowtransversemomentumtrackhitsandreduce thedatavolumebeforetransmissiontothefirstleveltrigger. Theinclusionoftrackinginformation in the trigger decision is essential to limit the first level trigger accept rate. A customized frontend readout chip, the CMS Binary Chip (CBC), containing stub finding logic has been designed for this purpose. A prototype module, equipped with the CBC chip, has been constructed and operated for the first time in a 4GeV/c positron beam at DESY. The behaviour of the stub finding was studied for different angles of beam incidence on a module, which allows an estimate of the sensitivitytotransversemomentumwithinthefutureCMSdetector. Asharptransversemomentum thresholdaround2GeV/c wasdemonstrated,whichmeetstherequirementtorejectalargefraction of low momentum tracks present in the LHC environment on-detector. This is the first realistic demonstration of a silicon tracking module that is able to select data, based on the particle’s transverse momentum, for use in a first level trigger at the LHC. The results from this test are describedhere.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.