Hadron collider triggers with high-quality tracking at very high event rates

• Published in: IEEE transactions on nuclear science Vol. 51; no. 3; pp. 391 - 400
• Main Authors: Annovi, A., Bardi, A., Campanelli, M., Carosi, R., Catastini, P., Cavasinni, V., Cerri, A., Clark, A., Dell'Orso, M., Del Prete, T., Dotti, A., Ferri, G., Giagu, S., Giannetti, P., Iannaccone, G., La Malfa, M., Morsani, F., Punzi, G., Rescigno, M., Roda, C., Shochet, M., Spinella, F., Torre, S., Usai, G., Vacavant, L., Vivarelli, I., Xin Wu, Zanello, L.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.06.2004; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Buffer storage; Calibration; Collaboration; Data acquisition; Detectors; Large Hadron Collider; Logic; Particle tracking; Pattern matching; Very large scale integration
• ISSN: 0018-9499; 1558-1578
• DOI: 10.1109/TNS.2004.828639

We propose precise and fast-track reconstruction at hadron collider experiments, for use in online trigger decisions. We describe the features of fast-track (FTK), a highly parallel processor dedicated to the efficient execution of a fast-tracking algorithm. The hardware-dedicated structure optimizes speed and size; these parameters are evaluated for the ATLAS experiment. We discuss some applications of high-quality tracks available to the trigger logic at an early stage, by using the LHC environment as a benchmark. The most interesting application is online selection of b-quarks down to very low transverse momentum, providing interesting hadronic samples: examples are Z/sup 0/spl rarr//bb~, potentially useful for jet calibration, and multi-b final states for supersymmetric Higgs searches. The paper is generated from outside the ATLAS experiment and has not been discussed by the ATLAS collaboration.