Development of a Level 1 Track Trigger for the CMS experiment at the high-luminosity LHC

Over the next decade, several upgrades in the LHC and its injector chain will eventually increase the luminosity by up to a factor of 10 compared to the original design figure of 10(34) cm(-2) s(-1). In order to cope with the large number of interactions per bunch crossing, a novel tracking system for the CMS experiment will be designed and built. The new tracker will also provide information to the Level 1 trigger decision, in order to improve the ability of selecting interesting physics channels in a higher density environment. The CMS collaboration is developing a novel module concept ("p(T)-module"), where signals from two closely spaced sensors are Correlated in the front-end electronics, to select pairs of hits compatible with particle PT above a certain threshold. Selected pairs of hits, called "track stubs", represent between 5% and 10% of the overall data rate: such a reduction factor enables the data processing at Level 1. Two main types of p(T)-modules are being developed, one based on strip sensors, and the other coupling a strip sensor with a pixelated sensor, which provides also precise information in the z coordinate. The main features of the p(T)-module options under development are reviewed, as well as the benchmark results from simulation studies. (C) 2013 CERN. Published by Elsevier B.V. All rights reserved.