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Event Samples and Preselection

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Book cover Search for Flavor-Changing Neutral Current Top Quark Decays t → Hq, with H → bb̅ , in pp Collisions at √s = 8 TeV with the ATLAS Detector

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Abstract

This chapter describes the event selection criteria, the data samples and the modeling of the signal and background samples used in the analysis.

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Notes

  1. 1.

    \(\mathop m\nolimits _\mathrm{{T}}^\mathrm{{W}}= \sqrt{2 p^\ell _{\mathrm T} E_{\mathrm {T}}^{\mathrm {miss}}(1-\cos \Delta \phi )}\), where \(p^\ell _{\mathrm T}\) is the transverse momentum (energy) of the muon (electron) and \(\Delta \phi \) is the azimuthal angle separation between the lepton and the direction of the missing transverse momentum.

  2. 2.

    The flavor of the jet is defined by looking at partons with \(p_\mathrm{{T}}> 5GeV\) within \(\Delta R < 0.3\) around the jet direction. If a b-quark is found, the jet is labeled as “b”. If no b-quarks are found, c-quarks are considered and if found, the jet is labeled as “c”. The remaining jets are labeled as “light”.

References

  1. ATLAS Collaboration, Measurement of the top quark-pair production cross section with ATLAS in pp collisions at \(\sqrt{s}=7\) TeV. Eur. Phys. J. C 71, 1577 (2011). arXiv:1012.1792 [hep-ex]

  2. P. Golonka, Z. Was, PHOTOS Monte Carlo: A Precision tool for QED corrections in \(Z\) and \(W\) decays. Eur. Phys. J. C 45, 97 (2006). arXiv:hep-ph/0506026

    Article  ADS  Google Scholar 

  3. S. Jadach, J. H. Kühn, Z. Waa̧s, TAUOLA - a library of Monte Carlo programs to simulate decays of polarized \(\tau \) leptons. Comput. Phys. Commun. 64, 275 (1991)

    Google Scholar 

  4. ATLAS Collaboration, The ATLAS simulation infrastructure. Eur. Phys. J. C 70, 823 (2010). arXiv:1005.4568 [physics.ins-det]

  5. S. Agostinelli et al., Geant4: a simulation toolkit. Nucl. Instrum. Method A 506, 250 (2003)

    Article  ADS  Google Scholar 

  6. ATLAS Collaboration, Summary of ATLAS Pythia 8 tunes, ATL-PHYS-PUB-2012-003 (2012), http://cds.cern.ch/record/1474107

  7. S. Frixione, P. Nason, G. Ridolfi, A positive-weight next-to-leading-order Monte Carlo for heavy flavour hadroproduction. JHEP 0709, 126 (2007). arXiv:0707.3088

    Article  ADS  Google Scholar 

  8. P. Nason, A new method for combining NLO QCD with shower Monte Carlo algorithms. JHEP 0411, 040 (2004). arXiv:hep-ph/0409146

    Article  ADS  Google Scholar 

  9. S. Frixione, P. Nason, C. Oleari, Matching NLO QCD computations with Parton shower simulations: the POWHEG method. JHEP 0711, 070 (2007). arXiv:0709.2092 [hep-ph]

    Article  ADS  Google Scholar 

  10. S. Alioli, P. Nason, C. Oleari, E. Re, A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX. JHEP 1006, 043 (2010). arXiv:1002.2581 [hep-ph]

    Article  ADS  MATH  Google Scholar 

  11. H.-L. Lai, M. Guzzi, J. Huston, Z. Li, P.M. Nadolsky et al., New parton distributions for collider physics. Phys. Rev. D 82, 074024 (2010). arXiv:1007.2241 [hep-ph]

    Article  ADS  Google Scholar 

  12. T. Sjöstrand, S. Mrenna, P.Z. Skands, PYTHIA 6.4 Physics and manual. JHEP 0605, 026 (2006). arXiv:hep-ph/0603175 [hep-ph]

  13. P.Z. Skands, Tuning Monte Carlo generators: The Perugia tunes. Phys. Rev. D 82, 074018 (2010). arXiv:1005.3457 [hep-ph]

    Article  ADS  Google Scholar 

  14. G. Corcella, I. Knowles, G. Marchesini, S. Moretti, K. Odagiri et al., HERWIG 6: An event generator for hadron emission reactions with interfering gluons (including supersymmetric processes). JHEP 0101, 010 (2001). arXiv:hep-ph/0011363 [hep-ph]

    Article  ADS  Google Scholar 

  15. J. Butterworth, J.R. Forshaw, M. Seymour, Multiparton interactions in photoproduction at HERA. Z. Phys. C 72, 637 (1996). arXiv:hep-ph/9601371 [hep-ph]

    ADS  Google Scholar 

  16. M. Czakon, A. Mitov, Top++: a program for the calculation of the top-pair cross-section at Hadron colliders. Comput. Phys. Commun. 185, 2930 (2014). arXiv:1112.5675 [hep-ph]

    Article  ADS  Google Scholar 

  17. M. Cacciari, M. Czakon, M. Mangano, A. Mitov, P. Nason, Top-pair production at hadron colliders with next-to-next-to-leading logarithmic soft-gluon resummation. Phys. Lett. B 710, 612 (2012). arXiv:1111.5869 [hep-ph]

    Article  ADS  Google Scholar 

  18. P. Bärnreuther, M. Czakon, A. Mitov, Percent level precision physics at the tevatron: first genuine NNLO QCD corrections to \(q \bar{q} \rightarrow t \bar{t} + X\). Phys. Rev. Lett. 109, 132001 (2012). arXiv:1204.5201 [hep-ph]

    Article  ADS  Google Scholar 

  19. M. Czakon, A. Mitov, NNLO corrections to top-pair production at hadron colliders: the all-fermionic scattering channels. JHEP 1212, 054 (2012). arXiv:1207.0236 [hep-ph]

    Article  ADS  Google Scholar 

  20. M. Czakon, A. Mitov, NNLO corrections to top pair production at hadron colliders: the quark-gluon reaction. JHEP 1301, 080 (2013). arXiv:1210.6832 [hep-ph]

    Article  ADS  Google Scholar 

  21. M. Czakon, P. Fiedler, A. Mitov, Total top-quark pair-production cross section at Hadron colliders through \(O(\alpha ^4_S)\). Phys. Rev. Lett. 110, 252004 (2013). arXiv:1303.6254 [hep-ph]

    Article  ADS  Google Scholar 

  22. A. Martin, W. Stirling, R. Thorne, G. Watt, Parton distributions for the LHC. Eur. Phys. J. C 63, 189 (2009). arXiv:0901.0002 [hep-ph]

    Article  ADS  Google Scholar 

  23. A. Martin, W. Stirling, R. Thorne, G. Watt, Uncertainties on alpha(S) in global PDF analyses and implications for predicted hadronic cross sections. Eur. Phys. J. C 64, 653 (2009). arXiv:0905.3531 [hep-ph]

    Article  ADS  Google Scholar 

  24. M. Botje, J. Butterworth, A. Cooper-Sarkar, A. de Roeck, J. Feltesse et al., The PDF4LHC Working Group Interim Recommendations. arXiv:1101.0538 [hep-ph]

  25. J. Gao, M. Guzzi, J. Huston, H.-L. Lai, Z. Li et al., CT10 next-to-next-to-leading order global analysis of QCD. Phys. Rev. D 89, 033009 (2014). arXiv:1302.6246 [hep-ph]

    Article  ADS  Google Scholar 

  26. R.D. Ball, V. Bertone, S. Carrazza, C.S. Deans, L. Del Debbio et al., Parton distributions with LHC data. Nucl. Phys. B 867, 244 (2013). arXiv:1207.1303 [hep-ph]

    Article  ADS  Google Scholar 

  27. ATLAS Collaboration, Measurements of normalized differential cross-sections for ttbar production in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector. Phys. Rev. D 90, 072004 (2014). arXiv:1407.0371 [hep-ex]

  28. ATLAS Collaboration, Search for the standard Model Higgs boson produced in association with top quarks and decaying into \(b\bar{b}\) in pp collisions at \(\sqrt{s}\) = 8 TeV with the ATLAS detector. Eur. Phys. J. C 75, 349 (2015). arXiv:1503.05066 [hep-ex]

  29. A. Bredenstein, A. Denner, S. Dittmaier, S. Pozzorini, NLO QCD corrections to pp \(\rightarrow \) t anti-t b anti-b + X at the LHC. Phys. Rev. Lett. 103, 012002 (2009). arXiv:0905.0110 [hep-ph]

    Article  ADS  Google Scholar 

  30. A. Bredenstein, A. Denner, S. Dittmaier, S. Pozzorini, NLO QCD corrections to top anti-top bottom anti-bottom production at the LHC: 2. full hadronic results. JHEP 1003, 021 (2010). arXiv:1001.4006 [hep-ph]

  31. G. Bevilacqua, M. Czakon, C. Papadopoulos, R. Pittau, M. Worek, Assault on the NLO wishlist: pp t anti-t b anti-b. JHEP 0909, 109 (2009). arXiv:0907.4723 [hep-ph]

    Article  ADS  Google Scholar 

  32. J. Alwall, M. Herquet, F. Maltoni, O. Mattelaer, T. Stelzer, MadGraph 5: going beyond. JHEP 1106, 128 (2011). arXiv:1106.0522 [hep-ph]

    Article  ADS  MATH  Google Scholar 

  33. T. Gleisberg, S. Hoeche, F. Krauss, M. Schonherr, S. Schumann et al., Event generation with SHERPA 1.1. JHEP 0902, 007 (2009). arXiv:0811.4622 [hep-ph]

  34. F. Cascioli, P. Maierhofer, S. Pozzorini, Scattering amplitudes with open loops. Phys. Rev. Lett. 108, 111601 (2012). arXiv:1111.5206 [hep-ph]

    Article  ADS  Google Scholar 

  35. J.M. Berlingen, A.J. Rozas, Search for new physics in \(t\bar{t}\) final states with additional heavy-flavor jets with the ATLAS detector. Autonoma U., Barcelona, 2015, https://cds.cern.ch/record/2053769/

  36. M. Mangano, M. Moretti, F. Piccinini, R. Pittau, A. Polosa, ALPGEN, a generator for hard multiparton processes in hadronic collisions. JHEP 0307, 001 (2003). arXiv:hep-ph/0206293 [hep-ph]

    Article  ADS  Google Scholar 

  37. M.L. Mangano, M. Moretti, R. Pittau, Multijet matrix elements and shower evolution in hadronic collisions: \(W b \bar{b}\) + \(n\) jets as a case study. Nucl. Phys. B 632, 343 (2002). arXiv:hep-ph/0108069

    Article  ADS  Google Scholar 

  38. K. Melnikov, F. Petriello, Electroweak gauge boson production at hadron colliders through O(alpha(s)**2). Phys. Rev. D 74, 114017 (2006). arXiv:hep-ph/0609070

    Article  ADS  Google Scholar 

  39. ATLAS Collaboration, Measurement of the charge asymmetry in top-quark pair production in the lepton-plus-jets final state in \(pp\) collision data at \(\sqrt{s}=8\) TeV with the ATLAS detector. Eur. Phys. J. C 76, 87 (2015). arXiv:1509.02358

  40. S. Alioli, P. Nason, C. Oleari, E. Re, NLO single-top production matched with shower in POWHEG: s- and t-channel contributions. JHEP 0909, 111 (2009). arXiv:0907.4076 [hep-ph]

    Article  ADS  Google Scholar 

  41. E. Re, Single-top Wt-channel production matched with parton showers using the POWHEG method. Eur. Phys. J. C 71, 1547 (2011). arXiv:1009.2450 [hep-ph]

    Article  ADS  Google Scholar 

  42. S. Frixione, E. Laenen, P. Motylinski, B.R. Webber, Single-top production in MC@NLO. JHEP 0603, 092 (2006). arXiv:hep-ph/0512250

    Article  ADS  Google Scholar 

  43. N. Kidonakis, Next-to-next-to-leading-order collinear and soft gluon corrections for t-channel single top quark production. Phys. Rev. D 83, 091503 (2011). arXiv:1103.2792 [hep-ph]

    Article  ADS  Google Scholar 

  44. N. Kidonakis, Two-loop soft anomalous dimensions for single top quark associated production with a W- or H-. Phys. Rev. D 82, 054018 (2010). arXiv:1005.4451 [hep-ph]

    Article  ADS  Google Scholar 

  45. N. Kidonakis, NNLL resummation for s-channel single top quark production. Phys. Rev. D 81, 054028 (2010). arXiv:1001.5034 [hep-ph]

    Article  ADS  Google Scholar 

  46. J.M. Campbell, R.K. Ellis, An update on vector boson pair production at Hadron colliders. Phys. Rev. D 60, 113006 (1999). arXiv:hep-ph/9905386

    Article  ADS  Google Scholar 

  47. ATLAS Collaboration, ATLAS tunes of PYTHIA6 and PYTHIA8 for MC11, ATL-PHYS-PUB-2011-008 (2011), https://cds.cern.ch/record/1363300

  48. M. Garzelli, A. Kardos, C. Papadopoulos, Z. Trocsanyi, t \(\bar{t}\) \(W^{+-}\) and t \(\bar{t}\) Z hadroproduction at NLO accuracy in QCD with Parton shower and hadronization effects. JHEP 1211, 056 (2012). arXiv:1208.2665 [hep-ph]

    Article  ADS  Google Scholar 

  49. M.V. Garzelli, A. Kardos, C. Papadopoulos, Z. Trocsanyi, Standard model Higgs boson production in association with a top anti-top pair at NLO with parton showering. Europhys. Lett. 96, 11001 (2011). arXiv:1108.0387 [hep-ph]

    Article  ADS  Google Scholar 

  50. G. Bevilacqua, M. Czakon, M. Garzelli, A. van Hameren, A. Kardos et al., HELAC-NLO. Comput. Phys. Commun. 184, 986 (2013). arXiv:1110.1499 [hep-ph]

    Article  ADS  Google Scholar 

  51. T. Sjostrand, S. Mrenna, P.Z. Skands, A. Brief, Introduction to PYTHIA 8.1. Comput. Phys. Commun. 178, 852 (2008). arXiv:0710.3820 [hep-ph]

    Article  ADS  MATH  Google Scholar 

  52. ATLAS Collaboration, New ATLAS event generator tunes to 2010 data, ATL-PHYS-PUB-2011-009 (2011), https://cds.cern.ch/record/1345343

  53. S. Dawson, C. Jackson, L. Orr, L. Reina, D. Wackeroth, Associated Higgs production with top quarks at the large Hadron collider: NLO QCD corrections. Phys. Rev. D 68, 034022 (2003). arXiv:hep-ph/0305087 [hep-ph]

    Article  ADS  Google Scholar 

  54. W. Beenakker et al., NLO QCD corrections to \(t\bar{t} H\) production in Hadron collisions. Nucl. Phys. B 653, 151 (2003). arXiv:hep-ph/0211352 [hep-ph]

    Article  ADS  Google Scholar 

  55. W. Beenakker et al., Higgs radiation off top quarks at the Tevatron and the LHC. Phys. Rev. Lett. 87, 201805 (2001). arXiv:hep-ph/0107081 [hep-ph]

    Article  ADS  Google Scholar 

  56. A. Djouadi, J. Kalinowski, M. Spira, HDECAY: a program for Higgs boson decays in the standard model and its supersymmetric extension. Comput. Phys. Commun. 108, 56 (1998). arXiv:hep-ph/9704448 [hep-ph]

    Article  ADS  MATH  Google Scholar 

  57. A. Bredenstein, A. Denner, S. Dittmaier, M. Weber, Precise predictions for the Higgs-boson decay \(H \rightarrow WW/ZZ \rightarrow 4\) leptons. Phys. Rev. D 74, 013004 (2006). arXiv:hep-ph/0604011 [hep-ph]

    Article  ADS  Google Scholar 

  58. S. Actis, G. Passarino, C. Sturm, S. Uccirati, NNLO computational techniques: the cases \(H \rightarrow \gamma \gamma \) and \(H \rightarrow g g\). Nucl. Phys. B 811, 182 (2009). arXiv:0809.3667 [hep-ph]

    Article  ADS  MATH  Google Scholar 

  59. A. Denner, S. Heinemeyer, I. Puljak, D. Rebuzzi, M. Spira, Standard model Higgs-Boson branching ratios with uncertainties. Eur. Phys. J. C 71, 1753 (2011). arXiv:1107.5909 [hep-ph]

    Article  ADS  Google Scholar 

  60. LHC Higgs Cross Section Working Group, Handbook of LHC Higgs Cross Sections: 1. Inclusive Observables. arXiv:1101.0593 [hep-ph]

  61. J.A. Aguilar-Saavedra, PROTOS, a Program for Top Simulations, http://jaguilar.web.cern.ch/jaguilar/protos/

  62. J.A. Aguilar-Saavedra, A minimal set of top-Higgs anomalous couplings. Nucl. Phys. B 821, 215 (2009). arXiv:0904.2387 [hep-ph]

    Article  ADS  MATH  Google Scholar 

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  1. Facultad de Ciencias, Departament de Física, Instituto de Física de Altas Energias, Universidad Autónoma de Barcelona, Bellaterra (Barcelona), Spain

    Shota Tsiskaridze

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Correspondence to Shota Tsiskaridze .

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Tsiskaridze, S. (2017). Event Samples and Preselection. In: Search for Flavor-Changing Neutral Current Top Quark Decays t → Hq, with H → bb̅ , in pp Collisions at √s = 8 TeV with the ATLAS Detector. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-63414-2_5

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