Extracting σ eff from the CDF γ + 3jets measurement

Article

Abstract

In their 1997 paper, CDF measured σ eff , the normalization factor that relates the cross section for double parton scattering to the product of the inclusive cross sections of the two individual scatters, in a model in which they are assumed to be independent. In his 2007 paper, Treleani pointed out that CDF used a non-standard definition, in which the double parton scattering cross section corresponds to exactly two scatters, rather than the more conventional one in which it is the inclusive two-scatter cross section. He also estimated the correction from one definition to the other, to give a corrected value of σ eff . Treleani’s form would be correct under the assumption that CDF were able to uniquely identify and count the number of scatters in an event, which is certainly not the case. In this publication we consider CDF’s event definition in more detail to provide an improved correction.

Keywords

QCD Phenomenology Hadronic Colliders 

References

  1. [1]
    AFS collaboration, T. Akesson et al., Double parton scattering in pp collisions at \( \sqrt{s}=63 \) GeV, Z. Phys. C 34 (1987) 163 [INSPIRE].ADSGoogle Scholar
  2. [2]
    D. Bandurin, G. Golovanov and N. Skachkov, Double parton interactions as a background to associated HW production at the Tevatron, JHEP 04 (2011) 054 [arXiv:1011.2186] [INSPIRE].ADSCrossRefGoogle Scholar
  3. [3]
    M. Hussein, A double parton scattering background to associate WH and ZH production at the LHC, Nucl. Phys. Proc. Suppl. 174 (2007) 55 [hep-ph/0610207] [INSPIRE].ADSCrossRefGoogle Scholar
  4. [4]
    A. Del Fabbro and D. Treleani, Double parton scattering background to Higgs boson production at the CERN LHC, Phys. Rev. D 61 (2000) 077502 [hep-ph/9911358] [INSPIRE].ADSGoogle Scholar
  5. [5]
    E. Maina, Multiple parton interactions in Z+ jets production at the LHC. A comparison of factorized and non-factorized double parton distribution functions, JHEP 01 (2011) 061 [arXiv:1010.5674] [INSPIRE].ADSCrossRefGoogle Scholar
  6. [6]
    E. Maina, Multiple parton interactions in Z + 4j, W ± W ± + 0/2j and W + W + 2j production at the LHC, JHEP 09 (2009) 081 [arXiv:0909.1586] [INSPIRE].ADSCrossRefGoogle Scholar
  7. [7]
    R. Godbole, S. Gupta and J. Lindfors, Double parton scattering contribution to W + jets, Z. Phys. C 47 (1990) 69 [INSPIRE].Google Scholar
  8. [8]
    T. Sjöstrand and M. van Zijl, A multiple interaction model for the event structure in hadron collisions, Phys. Rev. D 36 (1987) 2019 [INSPIRE].ADSGoogle Scholar
  9. [9]
    R. Engel, Photoproduction within the two component dual parton model. 1. Amplitudes and cross-sections, Z. Phys. C 66 (1995) 203.MathSciNetADSGoogle Scholar
  10. [10]
    J. Butterworth, J.R. Forshaw and M. Seymour, Multiparton interactions in photoproduction at HERA, Z. Phys. C 72 (1996) 637 [hep-ph/9601371] [INSPIRE].ADSGoogle Scholar
  11. [11]
    I. Borozan and M. Seymour, An eikonal model for multiparticle production in hadron hadron interactions, JHEP 09 (2002) 015 [hep-ph/0207283] [INSPIRE].ADSCrossRefGoogle Scholar
  12. [12]
    T. Sjöstrand and P.Z. Skands, Multiple interactions and the structure of beam remnants, JHEP 03 (2004) 053 [hep-ph/0402078] [INSPIRE].ADSCrossRefGoogle Scholar
  13. [13]
    T. Sjöstrand and P.Z. Skands, Transverse-momentum-ordered showers and interleaved multiple interactions, Eur. Phys. J. C 39 (2005) 129 [hep-ph/0408302] [INSPIRE].ADSCrossRefGoogle Scholar
  14. [14]
    S. Hoeche, F. Krauss and T. Teubner, Multijet events in the k T -factorisation scheme, Eur. Phys. J. C 58 (2008) 17 [arXiv:0705.4577] [INSPIRE].ADSCrossRefGoogle Scholar
  15. [15]
    M. Bahr, S. Gieseke and M.H. Seymour, Simulation of multiple partonic interactions in HERWIG++, JHEP 07 (2008) 076 [arXiv:0803.3633] [INSPIRE].ADSCrossRefGoogle Scholar
  16. [16]
    S. Gieseke, C. Röhr and A. Siódmok, Colour reconnections in HERWIG++, Eur. Phys. J. C 72 (2012) 2225 [arXiv:1206.0041] [INSPIRE].ADSGoogle Scholar
  17. [17]
    P. Bartalini et al., Multi-parton interactions at the LHC, arXiv:1111.0469 [INSPIRE].
  18. [18]
    S. Baranov, A. Snigirev, N. Zotov, A. Szczurek and W. Schafer, Interparticle correlations in the production of J/ψ pairs in proton-proton collisions, arXiv:1210.1806 [INSPIRE].
  19. [19]
    CDF collaboration, F. Abe et al., Double parton scattering in \( \overline{p}p \) collisions at \( \sqrt{s}=1.8 \) TeV, Phys. Rev. D 56 (1997) 3811 [INSPIRE].ADSGoogle Scholar
  20. [20]
    LHCb collaboration, Observation of double charm production involving open charm in pp collisions at \( \sqrt{s}=7 \) TeV, JHEP 06 (2012) 141 [arXiv:1205.0975] [INSPIRE].Google Scholar
  21. [21]
    LHCb collaboration, Observation of J/ψ pair production in pp collisions at \( \sqrt{s}=7 \) TeV, Phys. Lett. B 707 (2012) 52 [arXiv:1109.0963] [INSPIRE].ADSGoogle Scholar
  22. [22]
    LHCb collaboration, Observation of double J/ψ production in proton-proton collisions at a centre-of-mass energy of \( \sqrt{s}=7 \) TeV, LHCb-ANA-2011-020 (2011).Google Scholar
  23. [23]
    ATLAS collaboration, A measurement of hard double-partonic interactions in Wlν + 2 jet events using the ATLAS detector at the LHC, ATLAS-CONF-2011-160 (2011).
  24. [24]
    D. Treleani, Double parton scattering, diffraction and effective cross section, Phys. Rev. D 76 (2007) 076006 [arXiv:0708.2603] [INSPIRE].ADSGoogle Scholar
  25. [25]
    CDF collaboration, F. Abe et al., The topology of three jet events in \( \overline{p}p \) collisions at \( \sqrt{s}=1.8 \) TeV, Phys. Rev. D 45 (1992) 1448 [INSPIRE].ADSGoogle Scholar
  26. [26]
    S. Gieseke, D. Grellscheid, K. Hamilton, A. Papaefstathiou, S. Platzer, et al., HERWIG++ 2.5 release note, arXiv:1102.1672 [INSPIRE].
  27. [27]
    M. Bahr et al., HERWIG++ physics and manual, Eur. Phys. J. C 58 (2008) 639 [arXiv:0803.0883] [INSPIRE].ADSCrossRefGoogle Scholar
  28. [28]
    G. Corcella et al., HERWIG 6: an event generator for hadron emission reactions with interfering gluons (including supersymmetric processes), JHEP 01 (2001) 010 [hep-ph/0011363] [INSPIRE].ADSCrossRefGoogle Scholar
  29. [29]
    G. Corcella et al., HERWIG 6.5 release note, hep-ph/0210213 [INSPIRE].
  30. [30]
    T. Sjöstrand, S. Mrenna and P.Z. Skands, PYTHIA 6.4 physics and manual, JHEP 05 (2006) 026 [hep-ph/0603175] [INSPIRE].ADSCrossRefGoogle Scholar
  31. [31]
    A. Buckley et al., Rivet user manual, arXiv:1003.0694 [INSPIRE].
  32. [32]
    M. Cacciari, G.P. Salam and G. Soyez, FastJet user manual, Eur. Phys. J. C 72 (2012) 1896 [arXiv:1111.6097] [INSPIRE].ADSCrossRefGoogle Scholar
  33. [33]
    M. Cacciari and G.P. Salam, Dispelling the N 3 myth for the k t jet-finder, Phys. Lett. B 641 (2006) 57 [hep-ph/0512210] [INSPIRE].ADSGoogle Scholar
  34. [34]
    M.H. Seymour and C. Tevlin, A comparison of two different jet algorithms for the top mass reconstruction at the LHC, JHEP 11 (2006) 052 [hep-ph/0609100] [INSPIRE].ADSCrossRefGoogle Scholar
  35. [35]
    M. Cacciari, G.P. Salam and G. Soyez, The anti-k t jet clustering algorithm, JHEP 04 (2008) 063 [arXiv:0802.1189] [INSPIRE].ADSCrossRefGoogle Scholar
  36. [36]
    A.D. Martin, R. Roberts, W.J. Stirling and R. Thorne, Parton distributions: a new global analysis, Eur. Phys. J. C 4 (1998) 463 [hep-ph/9803445] [INSPIRE].ADSCrossRefGoogle Scholar
  37. [37]
    J. Pumplin et al., New generation of parton distributions with uncertainties from global QCD analysis, JHEP 07 (2002) 012 [hep-ph/0201195] [INSPIRE].ADSCrossRefGoogle Scholar
  38. [38]
    A. Sherstnev and R. Thorne, Parton distributions for LO generators, Eur. Phys. J. C 55 (2008) 553 [arXiv:0711.2473] [INSPIRE].ADSCrossRefGoogle Scholar
  39. [39]
    S. Gieseke, C. Röhr and A. Siódmok, Multiple partonic interaction developments in HERWIG++, arXiv:1110.2675 [INSPIRE].
  40. [40]
    M. Strikman, Transverse nucleon structure and multiparton interactions, Acta Phys. Polon. B 42 (2011) 2607 [arXiv:1112.3834] [INSPIRE].CrossRefGoogle Scholar
  41. [41]
    L. Frankfurt, M. Strikman and C. Weiss, Transverse nucleon structure and diagnostics of hard parton-parton processes at LHC, Phys. Rev. D 83 (2011) 054012 [arXiv:1009.2559] [INSPIRE].ADSGoogle Scholar
  42. [42]
    R. Corke and T. Sjöstrand, Multiparton interactions with an x-dependent proton size, JHEP 05 (2011) 009 [arXiv:1101.5953] [INSPIRE].ADSCrossRefGoogle Scholar

Copyright information

© SISSA, Trieste, Italy 2013

Authors and Affiliations

  • M. Bähr
    • 1
  • M. Myska
    • 2
  • M. H. Seymour
    • 3
  • A. Siódmok
    • 3
  1. 1.Blue Yonder GmbH & Co. KGKarlsruheGermany
  2. 2.FNSPE, Czech Technical University in PraguePragueCzech Republic
  3. 3.Consortium for Fundamental Physics, School of Physics and AstronomyThe University of ManchesterManchesterU.K

Personalised recommendations