The CMS high level trigger

  • The CMS Collaboration
Experimental Physics

Abstract

At the Large Hadron Collider at CERN the proton bunches cross at a rate of 40 MHz. At the Compact Muon Solenoid experiment the original collision rate is reduced by a factor of \(\mathcal{O}\) (1000) using a Level-1 hardware trigger. A subsequent factor of \(\mathcal{O}\) (1000) data reduction is obtained by a software-implemented high level trigger (HLT) selection that is executed on a multi-processor farm. In this review we present in detail prototype CMS HLT physics selection algorithms, expected trigger rates and trigger performance in terms of both physics efficiency and timing.

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References

  1. 1.
    The LHC Study Group, The Large Hadron Collider Conceptual Design, CERN-AC-95-05 (1995)Google Scholar
  2. 2.
    See e.g. B. Heinemann, Int. J. Mod. Phys. A 20, 5164–5173 (2005)CrossRefADSGoogle Scholar
  3. 3.
    J.G. Branson et al., Eur. Phys. J. Direct C4, N1 (2002), [hep-ph/0110021]Google Scholar
  4. 4.
    F. Gianotti, M. Pepe-Altarelli, Nucl. Phys. Proc. Suppl. 89, 177 (2000), [hep-ex/0006016]CrossRefADSGoogle Scholar
  5. 5.
    T. Sjöstrand, L. Lonnblad and S Mrenna, PYTHIA6.2: Physics and Manual, [hep-ph/0108264]; T. Sjöstrand, P. Edén, C. Friberg, L. Lönnblad, G. Miu, S. Mrenna, E. Norrbin, Computer Phys. Commun. 135, 238 (2001)MATHCrossRefADSGoogle Scholar
  6. 6.
    G.A. Schuler, T. Sjöstrand, Phys. Rev. D 49, 2257 (1994)CrossRefADSGoogle Scholar
  7. 7.
    CMS Coll., The Trigger and Data Acquisition project, Volume I, The Level-1 Trigger, Technical Design Report, CERN/LHCC 2000-038, CMS TDR 6.1, 15 December 2000Google Scholar
  8. 8.
    H. Baer et al., ISAJET, a Monte Carlo for pp p̄p and e+e- reactions, [hep-ph/0001086]Google Scholar
  9. 9.
    N. Amapane et al., Monte Carlo Simulation of Inclusive Single-Muon and Di-Muon Samples, CMS Note [2002/041]Google Scholar
  10. 10.
    H. Sakulin, J. Phys. G 30, N45 (2004)Google Scholar
  11. 11.
    CMS Simulation Package CMSIM, The Users Guide and Reference Manual, http://cmsdoc.cern.ch/cmsim/cmsim.htmlGoogle Scholar
  12. 12.
    GEANT3, version 3.21/13: Detector Description and Simulation Tool, CERN program library long writeup W5013Google Scholar
  13. 13.
    E. Meschi et al., Electron Reconstruction in the CMS Electromagnetic Calorimeter, CMS Note 2001/034Google Scholar
  14. 14.
    P. Aspell et al., Results from the 1999 Beam Test of a Preshower Prototype, CMS Note 2001/001Google Scholar
  15. 15.
    I. Puljak, These de Doctorat de l’Universite Paris VI, 21 Sept 2000Google Scholar
  16. 16.
    CMS Coll., The Electromagnetic Calorimeter Project, Technical Design Report, CERN/LHCC 97-33, CMS TDR 4, 15 December 1997Google Scholar
  17. 17.
    G. Daskalakis, K. Lassila-Perini, Jet rejection using the pixel matching for the low and the high luminosity, CMS Note 2002/039Google Scholar
  18. 18.
    P. Billoir, R. Früwirth, M. Regler, Nucl. Instrum. Methods A 241, 115 (1985)CrossRefADSGoogle Scholar
  19. 19.
    V. Innocente, M. Maire, E. Nagy, GEANE, CERN program library long writeup W5013-EGoogle Scholar
  20. 20.
    G. Bruno et al., Local reconstruction in the muon detectors, CMS Note 2002/043Google Scholar
  21. 21.
    N. Amapane, M. Fierro, M. Konecki, High-Level Trigger Algorithms for Muon Isolation, CMS Note 2002/040Google Scholar
  22. 22.
    D. Green et al., Energy Flow Objects and Usage of Tracks for Energy Measurement in CMS, CMS Note 2002/036Google Scholar
  23. 23.
    R. Kinnunen, A. Nikitenko, Study of H(SUSY) →ττ→l+τJet+≠ET in CMS, CMS Note 1997/106Google Scholar
  24. 24.
    D. Denegri, R. Kinnunen, Study of H(SUSY) →ττ→h++h-+X in CMS, CMS Note 1999/037Google Scholar
  25. 25.
    R. Kinnunen, Study for Heavy Charged Higgs in pp→tH+ with H+τ+ν in CMS, CMS Note 2000/045Google Scholar
  26. 26.
    J.E. Huth et al., Proc. Res. Directions for the decade, Snowmass 1990Google Scholar
  27. 27.
    S. Eno et al., A Study of a First and Second Level Tau Trigger, CMS Note 2000/055Google Scholar
  28. 28.
    D. Kotlinski, A. Nikitenko, R. Kinnunen, Study of a Level-3 Tau Trigger with the Pixel Detector, CMS Note 2001/017Google Scholar
  29. 29.
    G. Bagliesi, S. Gennai, G. Sguazzoni, A L2 Trigger for Tau Hadronic Decays with Tracker Isolation in the Low Luminosity Scenario, CMS Note 2002/018Google Scholar
  30. 30.
    G. Segneri, F. Palla, Lifetime-based b-tagging with CMS, CMS Note 2002/046Google Scholar
  31. 31.
    The LEP Heavy Flavour Group, “Input Parameters for the LEP/SLD Heavy Flavour Analyses”, LEPHF/2001-01, http://www.cern.ch/LEPEWWG/heavy/lephf0101.ps.gzGoogle Scholar
  32. 32.
    D. Kotlinski, A. Starodumov, High Level Tracker Triggers for CMS, Presented at: Vertex 2001, Brunnen Switzerland, September 2000, CMS Conference Report 2002/003Google Scholar
  33. 33.
    D. Kotlinski, Nucl. Phys. Proc. Suppl. 120, 249 (2003)CrossRefADSGoogle Scholar
  34. 34.
    M. Winkler et al., Estimation of Alignment Parameters, Using the Kalman Filter with Annealing, CMS Note 2002/008Google Scholar
  35. 35.
    A. Ostaptchouk et al., The Alignment System of the CMS Tracker, CMS Note 2001/053Google Scholar
  36. 36.
    D. Futyan, C. Seez, Intercalibration of ECAL Crystals in Phi Using Symmetry of Energy Deposition, CMS Note 2002/031Google Scholar
  37. 37.
    CMS Coll., The Hadronic Calorimeter Project, Technical Design Report, CERN/LHCC 97–31, CMS TDR 2, 20 June 1997Google Scholar
  38. 38.
    CMS Coll., The Muon Project, Technical Design Report, CERN/LHCC 97–32, CMS TDR 3, 15 December 1997Google Scholar
  39. 39.
    O.J.P. Eboli, D. Zeppenfeld, Phys. Lett. B 495, 147 (2000)CrossRefADSGoogle Scholar
  40. 40.
    B. Di Girolamo et al., Experimental Observation of an Invisible Higgs Boson at the LHC, Workshop on Physics at TeV Colliders, Les Houches, 2001, the Higgs Working Group: summary report, [hep-ph/0203056]Google Scholar
  41. 41.
    H. Baer et al., Phys. Rev. D 58, 075008 (1998)CrossRefGoogle Scholar
  42. 42.
    H. Baer, F.E. Paige, S.D. Protopopescu, X. Tata, [hep-ph/0001086]Google Scholar
  43. 43.
    G. Corcella, I.G. Knowles, G. Marchesini, S. Moretti, K. Odagiri, P. Richardson, M.H. Seymour, B.R. Webber, JHEP 01, 010 (2001)CrossRefADSGoogle Scholar
  44. 44.
    N. Arkani-Hamed, A.G. Cohen, T. Gregoire, E. Katz, A.E. Nelson, J.G. Wacker, HEP 0208, 021 (2002); M. Schmaltz, Introducing the Little Higgs, [hep-ph/0210415]MathSciNetADSGoogle Scholar
  45. 45.
    D. Amidei, R. Brock, Future Electroweak Physics at the Fermilab Tevatron: Report of the TeV 2000 Study Group, FERMILAB-PUB-96/08Google Scholar
  46. 46.
    CDF coll., F. Abe et al., Phys. Rev. Lett. 74, 3538 (1995)CrossRefGoogle Scholar
  47. 47.
    L. Vacavant, I Hinchliffe, J. Phys. 27, 1839 (2001)Google Scholar
  48. 48.
    H. Cheng, K. Matchev, M. Schmalz, Phys. Rev. D 66, 056006 (2002) , [hep-ph/0205314]CrossRefADSGoogle Scholar
  49. 49.
    C. Macesanu, C.D. McMullen, S. Nandi, Phys. Lett. B 546, 253 (2002)CrossRefADSGoogle Scholar
  50. 50.
    G. Azuelos et al., Exploring Little Higgs models with ATLAS at the LHC, [hep-ph/0402037]Google Scholar

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© Springer-Verlag 2006

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  • The CMS Collaboration

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