Design and performance of the LHCb trigger and full real-time reconstruction in Run 2 of the LHC

Aaij, R.; Akar, S.; Albrecht, J.; Alexander, M.; Albero, A. Alfonso; Amerio, S.; Anderlini, L.; D'Argent, P.; Baranov, A.; Barter, W.; Benson, S.; Bobulska, D.; Boettcher, T.; Borghi, S.; Bowen, E. E.; Brarda, L.; Burr, C.; Cachemiche, J-P; Calvo Gomez, M.; Cattaneo, M.; Chanal, H.; Chapman, M.; Chebbi, M.; Chefdeville, M.; Ciambrone, P.; Cogan, J.; Chitic, S-G; Clemencic, M.; Closier, J.; Couturier, B.; Daoudi, M.; De Bruyn, K.; De Cian, M.; Deschamps, O.; Dettori, F.; Dordei, F.; Douglas, L.; Dreimanis, K.; Dufour, L.; Dujany, G.; Durante, P.; Duval, P-Y; Dziurda, A.; Esen, S.; Fitzpatrick, C.; Fontanna, M.; Frank, M.; Van Veghel, M.; Gaspar, C.; Gerstel, D.; Ghez, Ph; Gizdov, K.; Gligorov, Vv; Govorkova, E.; Granado Cardoso, L. A.; Grillo, L.; Guz, I; Hachon, F.; He, J.; Hill, D.; Hu, W.; Hulsbergen, W.; Ilten, P.; Li, Y.; Linn, C. P.; Lupton, O.; Johnson, D.; Jones, C. R.; Jost, B.; Kenzie, M.; Kopecna, R.; Koppenburg, P.; Kreps, M.; Le Gac, R.; Lefevre, R.; Leroy, O.; Machefert, F.; Mancinelli, G.; Maddrell-Mander, S.; Marchand, J. F.; Marconi, U.; Benito, C. Marin; Martinelli, M.; Martinez Santos, D.; Matev, R.; Michielin, E.; Monteil, S.; Morris, A.; Minard, M-N; Mohamed, H.; Morello, M. J.; Naik, P.; Neubert, S.; Neufeld, N.; Niel, E.; Pearce, A.; Perret, P.; Polci, F.; Prisciandaro, J.; Prouve, C.; Navarro, A. Puig; Ramos Pernas, M.; Raven, G.; Rethore, F.; Rives Molina, V; Robbe, P.; Sarpis, G.; Sborzacchi, F.; Schiller, M.; Schwemmer, R.; Sciascia, B.; Serrano, J.; Seyfert, P.; Schune, M-H; Smith, M.; Solomin, A.; Sokoloff, M.; Spradlin, P.; Stahl, M.; Stahl, S.; Storaci, B.; Stracka, S.; Szymanski, M.; Traill, M.; Usachov, A.; Valat, S.; Vazquez Gomez, R.; Vesterinen, M.; Voneki, B.; Wang, M.; Weisser, C.; Whitehead, M.; Williams, M.; Winn, M.; Witek, M.; Xiang, Z.; Xu, A.; Xu, Z.; Yin, H.; Zhang, Y.; Zhou, Y.

doi:10.1088/1748-0221/14/04/P04013

The LHCb collaboration has redesigned its trigger to enable the full offline detector reconstruction to be performed in real time. Together with the real-time alignment and calibration of the detector, and a software infrastructure to make persistent the high-level physics objects produced during real-time processing, this redesign enabled the widespread deployment of real-time analysis during Run 2. We describe the design of the Run 2 trigger and real-time reconstruction, and present data-driven performance measurements for a representative sample of LHCb's physics programme.