Performance of the CMS Level-1 trigger during commissioning with cosmic ray muons and LHC beams

Chatrchyan, S.
Khachatryan, V.
Sirunyan, A. M.
Adam, W.
Arnold, B.
Bergauer, H.
Bergauer, T.
Dragicevic, M.
Eichberger, M.
Eroe, J.
Friedl, M.
Fruehwirth, R.
Ghete, V. M.
Hammer, J.
Haensel, S.
Hoch, M.
Hoermann, N.
Hrubec, J.
Jeitler, M.
Kasieczka, G.
Kastner, K.
Krammer, M.
Liko, D.
de Abril, I. Magrans
Mikulec, I.
Mittermayr, F.
Neuherz, B.
Oberegger, M.
Padrta, M.
Pernicka, M.
Rohringer, H.
Schmid, S.
Schoefbeck, R.
Schreiner, T.
Stark, R.
Steininger, H.
Strauss, J.
Taurok, A.
Teischinger, F.
Themel, T.
Uhl, D.
Wagner, P.
Waltenberger, W.
Walzel, G.
Widl, E.
Wulz, C. -E.
Chekhovsky, V.
Dvornikov, O.
Emeliantchik, I.
Litomin, A.
Makarenko, V.
Marfin, I.
Mossolov, V.
Shumeiko, N.
Solin, A.
Stefanovitch, R.
Gonzalez, J. Suarez
Tikhonov, A.
Fedorov, A.
Karneyeu, A.
Korzhik, M.
Panov, V.
Zuyeuski, R.
Kuchinsky, P.
Beaumont, W.
Benucci, L.
Cardaci, M.
De Wolf, E. A.
Delmeire, E.
Druzhkin, D.
Hashemi, M.
Janssen, X.
Maes, T.
Mucibello, L.
The CMS Level-1 trigger was used to select cosmic ray muons and LHC beam events during data-taking runs in 2008, and to estimate the level of detector noise. This paper describes the trigger components used, the algorithms that were executed, and the trigger synchronisation. Using data from extended cosmic ray runs, the muon, electron/photon, and jet triggers have been validated, and their performance evaluated. Efficiencies were found to be high, resolutions were found to be good, and rates as expected.


Performance of the CMS drift-tube chamber local trigger with cosmic rays
Chatrchyan, S.; et. al. (IOP Publishing, 2010-03-01)
The performance of the Local Trigger based on the drift-tube system of the CMS experiment has been studied using muons from cosmic ray events collected during the commissioning of the detector in 2008. The properties of the system are extensively tested and compared with the simulation. The effect of the random arrival time of the cosmic rays on the trigger performance is reported, and the results are compared with the design expectations for proton-proton collisions and with previous measurements obtained ...
Performance of photon reconstruction and identification with the CMS detector in proton-proton collisions at root s=8TeV
Khachatryan, V.; et. al. (IOP Publishing, 2015-08-01)
A description is provided of the performance of the CMS detector for photon reconstruction and identification in proton-proton collisions at a centre-of-mass energy of 8 TeV at the CERN LHC. Details are given on the reconstruction of photons from energy deposits in the electromagnetic calorimeter (ECAL) and the extraction of photon energy estimates. The reconstruction of electron tracks from photons that convert to electrons in the CMS tracker is also described, as is the optimization of the photon energy r...
Performance of the CMS muon detector and muon reconstruction with proton-proton collisions at root s=13 TeV
Sirunyan, A. M.; et. al. (IOP Publishing, 2018-06-01)
The CMS muon detector system, muon reconstruction software, and high-level trigger underwent significant changes in 2013-2014 in preparation for running at higher LHC collision energy and instantaneous luminosity. The performance of the modified system is studied using proton-proton collision data at center-of-mass energy root s = 13 TeV, collected at the LHC in 2015 and 2016. The measured performance parameters, including spatial resolution, efficiency, and timing, are found to meet all design specificatio...
Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at root s=8 TeV
Khachatryan, V.; et. al. (IOP Publishing, 2015-06-01)
The performance and strategies used in electron reconstruction and selection at CMS are presented based on data corresponding to an integrated luminosity of 19.7 fb(-1), collected in proton-proton collisions at root s = 8TeV at the CERN LHC. The paper focuses on prompt isolated electrons with transverse momenta ranging from about 5 to a few 100 GeV. A detailed description is given of the algorithms used to cluster energy in the electromagnetic calorimeter and to reconstruct electron trajectories in the trac...
Performance of the CMS drift tube chambers with cosmic rays
Chatrchyan, S.; et. al. (IOP Publishing, 2010-03-01)
Studies of the performance of the CMS drift tube barrel muon system are described, with results based on data collected during the CMS Cosmic Run at Four Tesla. For most of these data, the solenoidal magnet was operated with a central field of 3.8 T. The analysis of data from 246 out of a total of 250 chambers indicates a very good muon reconstruction capability, with a coordinate resolution for a single hit of about 260 mu m, and a nearly 100% efficiency for the drift tube cells. The resolution of the trac...
Citation Formats
S. Chatrchyan et al., “Performance of the CMS Level-1 trigger during commissioning with cosmic ray muons and LHC beams,” JOURNAL OF INSTRUMENTATION, pp. 0–0, 2010, Accessed: 00, 2020. [Online]. Available: