Navegar

Colección

Datos Estadísticas

Artículo

Estamos trabajando para incorporar este artículo al repositorio
Consulte el artículo en la página del editor
Consulte la política de Acceso Abierto del editor

Abstract:

A search for the associated production of the Higgs boson with a top quark pair (ttH) is reported. The search is performed in multilepton final states using a data set corresponding to an integrated luminosity of 36.1 fb-1 of proton-proton collision data recorded by the ATLAS experiment at a center-of-mass energy s=13 TeV at the Large Hadron Collider. Higgs boson decays to WW∗, ττ, and ZZ∗ are targeted. Seven final states, categorized by the number and flavor of charged-lepton candidates, are examined for the presence of the Standard Model Higgs boson with a mass of 125 GeV and a pair of top quarks. An excess of events over the expected background from Standard Model processes is found with an observed significance of 4.1 standard deviations, compared to an expectation of 2.8 standard deviations. The best fit for the ttH production cross section is σ(ttH)=790-210+230 fb, in agreement with the Standard Model prediction of 507-50+35 fb. The combination of this result with other ttH searches from the ATLAS experiment using the Higgs boson decay modes to bb, γγ and ZZ∗→4, has an observed significance of 4.2 standard deviations, compared to an expectation of 3.8 standard deviations. This provides evidence for the ttH production mode. © 2018 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the »https://creativecommons.org/licenses/by/4.0/» Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP 3 .

Registro:

Documento: Artículo
Título:Evidence for the associated production of the Higgs boson and a top quark pair with the ATLAS detector
Autor:Aaboud, M. et al.
Este artículo contiene 2857 autores, consultelos en el artículo en formato pdf.
Filiación: Este artículo contiene 2857 autores con sus filiaciones, consultelas en el artículo en formato pdf.
Año:2018
Volumen:97
Número:7
DOI: http://dx.doi.org/10.1103/PhysRevD.97.072003
Título revista:Physical Review D
Título revista abreviado:Phy. Rev. D
ISSN:24700010
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_24700010_v97_n7_p_Aaboud

Referencias:

  • Evans, L., Bryant, P., LHC machine (2008) J. Instrum., 3, p. S08001
  • Glashow, S.L., Partial symmetries of weak interactions (1961) Nucl. Phys., 22, p. 579
  • Weinberg, S., A Model of Leptons (1967) Phys. Rev. Lett., 19, p. 1264
  • Salam, A., Weak and electromagnetic interactions (1968) Conf. Proc., C680519, p. 36
  • Hooft, G., Veltman, M.J.G., Regularization and renormalization of gauge fields (1972) Nucl. Phys., B44, p. 189
  • Englert, F., Brout, R., Broken Symmetry and the Mass of Gauge Vector Mesons (1964) Phys. Rev. Lett., 13, p. 321
  • Higgs, P.W., Broken Symmetries and the Masses of Gauge Bosons (1964) Phys. Rev. Lett., 13, p. 508
  • Guralnik, G.S., Hagen, C.R., Kibble, T.W.B., Global Conservation Laws and Massless Particles (1964) Phys. Rev. Lett., 13, p. 585
  • Higgs, P.W., Spontaneous Symmetry Breakdown without Massless Bosons (1966) Phys. Rev., 145, p. 1156
  • Kibble, T.W.B., Symmetry Breaking in Non-Abelian Gauge Theories (1967) Phys. Rev., 155, p. 1554
  • Observation of a new particle in the search for the standard model Higgs boson with the ATLAS detector at the LHC (2012) Phys. Lett. B, 716, p. 1. , ATLAS Collaboration
  • Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC (2012) Phys. Lett. B, 716, p. 30. , CMS Collaboration
  • Measurements of the Higgs boson production and decay rates and coupling strengths using (Equation presented) collision data at (Equation presented) and 8 TeV in the ATLAS experiment (2016) Eur. Phys. J. C, 76, p. 6. , ATLAS Collaboration
  • Precise determination of the mass of the Higgs boson and tests of compatibility of its couplings with the standard model predictions using proton collisions at 7 and 8 TeV (2015) Eur. Phys. J. C, 75, p. 212. , CMS Collaboration
  • Study of the Mass and Spin-Parity of the Higgs Boson Candidate via Its Decays to Z Boson Pairs (2013) Phys. Rev. Lett., 110, p. 081803. , CMS Collaboration
  • Evidence for the spin-0 nature of the Higgs boson using ATLAS data (2013) Phys. Lett. B, 726, p. 120. , ATLAS Collaboration
  • Constraints on the spin-parity and anomalous HVV couplings of the Higgs boson in proton collisions at 7 and 8 TeV (2015) Phys. Rev. D, 92, p. 012004. , CMS Collaboration
  • Measurements of the Higgs boson production and decay rates and constraints on its couplings from a combined ATLAS and CMS analysis of the LHC (Equation presented) collision data at (Equation presented) and 8 TeV J. High Energy Phys., 2016 (8), p. 045. , ATLAS and CMS Collaborations
  • Nambu, Y., Jona-Lasinio, G., Dynamical Model of Elementary Particles Based on an Analogy with Superconductivity. 1 (1961) Phys. Rev., 122, p. 345
  • Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector J. High Energy Phys., 2015 (4), p. 117. , ATLAS Collaboration
  • Evidence for the 125 GeV Higgs boson decaying to a pair of (Equation presented) leptons J. High Energy Phys., 2014 (5), p. 104. , CMS Collaboration
  • Observation of the Higgs boson decay to a pair of (Equation presented) leptons with the CMS detector (2018) Phys. Lett. B, 779, p. 283. , CMS Collaboration
  • Evidence for the (Equation presented) decay with the ATLAS detector J. High Energy Phys., 2017 (12), p. 024. , ATLAS Collaboration
  • Evidence for the Higgs Boson Decay to A Bottom Quark-antiquark Pair, , CMS Collaboration
  • Evidence for a Particle Produced in Association with Weak Bosons and Decaying to a Bottom-Antibottom Quark Pair in Higgs Boson Searches at the Tevatron (2012) Phys. Rev. Lett., 109, p. 071804. , CDF and D0 Collaborations
  • Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector (2015) Phys. Lett. B, 749, p. 519. , ATLAS Collaboration
  • Search for the standard model Higgs boson produced in association with top quarks and decaying into (Equation presented) in (Equation presented) collisions at (Equation presented) with the ATLAS detector (2015) Eur. Phys. J. C, 75, p. 349. , ATLAS Collaboration
  • Search for (Equation presented) produced in association with top quarks and constraints on the Yukawa coupling between the top quark and the Higgs boson using data taken at 7 TeV and 8 TeV with the ATLAS detector (2015) Phys. Lett. B, 740, p. 222. , ATLAS Collaboration
  • Search for the standard model Higgs boson produced in association with a top-quark pair in (Equation presented) collisions at the LHC J. High Energy Phys., 2013 (5), p. 145. , CMS Collaboration
  • Search for the associated production of the Higgs boson with a top-quark pair J. High Energy Phys., 2014 (9), p. 087. , CMS Collaboration
  • De Florian, D., Handbook of LHC Higgs Cross Sections: 4. Deciphering the Nature of the Higgs Sector
  • Beenakker, W., Dittmaier, S., Krämer, M., Plümper, B., Spira, M., Zerwas, P.M., NLO QCD corrections to (Equation presented) production in hadron collisions (2003) Nucl. Phys., B653, p. 151
  • Dawson, S., Jackson, C., Orr, L.H., Reina, L., Wackeroth, D., Associated Higgs production with top quarks at the large hadron collider: NLO QCD corrections (2003) Phys. Rev. D, 68, p. 034022
  • Zhang, Y., Ma, W.-G., Zhang, R.-Y., Chen, C., Guo, L., QCD NLO and EW NLO corrections to (Equation presented) production with top quark decays at hadron collider (2014) Phys. Lett. B, 738, p. 1
  • Frixione, S., Hirschi, V., Pagani, D., Shao, H.S., Zaro, M., Weak corrections to Higgs hadroproduction in association with a top-quark pair J. High Energy Phys., 2014 (9), p. 065
  • Search for the Standard Model Higgs Boson Produced in Association with Top Quarks and Decaying into A (Equation Presented) Pair in (Equation Presented) Collisions at (Equation Presented) with the ATLAS Detector, , ATLAS Collaboration
  • Measurements of Higgs Boson Properties in the Diphoton Decay Channel with (Equation Presented) of Pp Collision Data at (Equation Presented) with the ATLAS Detector, , ATLAS Collaboration
  • Measurement of the Higgs Boson Coupling Properties in the (Equation Presented) Decay Channel at (Equation Presented) with the ATLAS Detector, , ATLAS Collaboration
  • The ATLAS Experiment at the CERN Large Hadron Collider (2008) J. Instrum., 3, p. S08003. , ATLAS Collaboration
  • (2010), https://cds.cern.ch/record/1291633, ATLAS Collaboration, ATLAS Insertable B-Layer Technical Design Report No. ATLAS-TDR-19; (2012), https://cds.cern.ch/record/1451888, ATLAS Collaboration ATLAS Insertable B-Layer Technical Design Report Addendum No. ATLAS-TDR-19-ADD-1; Performance of the ATLAS trigger system in 2015 (2016) Eur. Phys. J. C, 77, p. 317. , ATLAS Collaboration
  • The ATLAS Simulation Infrastructure (2010) Eur. Phys. J. C, 70, p. 823. , ATLAS Collaboration
  • Agostinelli, S., Geant4: A simulation toolkit (2003) Nucl. Instrum. Methods Phys. Res., Sect. A, 506, p. 250
  • (2010), https://cds.cern.ch/record/1300517, ATLAS Collaboration, Report No. ATL-PHYS-PUB-2010-013; Sjöstrand, T., Mrenna, S., Skands, P.Z., PYTHIA 6.4 physics and manual J. High Energy Phys., 2006 (5), p. 026
  • Sjöstrand, T., Mrenna, S., Skands, P.Z., A brief introduction to PYTHIA 8.1 (2008) Comput. Phys. Commun., 178, p. 852
  • (2012), https://cds.cern.ch/record/1474107, ATLAS Collaboration, Report No. ATL-PHYS-PUB-2012-003; Martin, A., Stirling, W.J., Thorne, R.S., Watt, G., Parton distributions for the LHC (2009) Eur. Phys. J. C, 63, p. 189
  • (2016), https://cds.cern.ch/record/2120826, ATLAS Collaboration, Report No. ATL-PHYS-PUB-2016-005; (2016), https://cds.cern.ch/record/2119986, ATLAS Collaboration, Report No. ATL-PHYS-PUB-2016-002; (2016), https://cds.cern.ch/record/2120417, ATLAS Collaboration, Report No. ATL-PHYS-PUB-2016-004; Ball, R.D., Parton distributions with LHC data (2013) Nucl. Phys., B867, p. 244
  • (2014), https://cds.cern.ch/record/1966419, ATLAS Collaboration, Report No. ATL-PHYS-PUB-2014-021; Pumplin, J., Stump, D.R., Huston, J., Lai, H.-L., Nadolsky, P., Tung, W.-K., New generation of parton distributions with uncertainties from global QCD analysis J. High Energy Phys., 2002 (7), p. 012
  • Nadolsky, P.M., Lai, H.-L., Cao, Q.-H., Huston, J., Pumplin, J., Stump, D., Tung, W.-K., Yuan, C.-P., Implications of CTEQ global analysis for collider observables (2008) Phys. Rev. D, 78, p. 013004
  • Seymour, M.H., Siodmok, A., Constraining MPI models using (Equation presented) and recent Tevatron and LHC underlying event data J. High Energy Phys., 2013 (10), p. 113
  • Skands, P., Tuning Monte Carlo generators: The Perugia tunes (2010) Phys. Rev. D, 82, p. 074018
  • Alwall, J., Frederix, R., Frixione, S., Hirschi, V., Maltoni, F., Mattelaer, O., Shao, H.-S., Zaro, M., The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations J. High Energy Phys., 2014 (7), p. 079
  • Sjöstrand, T., Edén, P., Friberg, C., Lönnblad, L., Miu, G., Mrenna, S., Norrbin, E., High-energy-physics event generation with Pythia 6.1 (2001) Comput. Phys. Commun., 135, p. 238
  • Bahr, M., Herwig++ physics and manual (2008) Eur. Phys. J. C, 58, p. 639
  • Gleisberg, T., Höche, S., Krauss, F., Schönherr, M., Schumann, S., Siegert, F., Winter, J., Event generation with SHERPA 1.1 J. High Energy Phys., 2009 (2), p. 007
  • Cascioli, F., Maierhofer, P., Pozzorini, S., Scattering Amplitudes with Open Loops (2012) Phys. Rev. Lett., 108, p. 111601
  • Gleisberg, T., Hoeche, S., Comix, a new matrix element generator J. High Energy Phys., 2008 (12), p. 039
  • Schumann, S., Krauss, F., A Parton shower algorithm based on Catani-Seymour dipole factorisation J. High Energy Phys., 2008 (3), p. 038
  • Hoeche, S., Krauss, F., Schonherr, M., Siegert, F., QCD matrix (Equation presented): The NLO case J. High Energy Phys., 2013 (4), p. 027
  • Lange, D.J., The EvtGen particle decay simulation package (2001) Nucl. Instrum. Methods Phys. Res., Sect. A, 462, p. 152
  • Golonka, P., Was, Z., PHOTOS Monte Carlo: A precision tool for QED corrections in Z and W decays (2006) Eur. Phys. J. C, 45, p. 97
  • Ball, R.D., Parton distributions for the LHC run II J. High Energy Phys., 2015 (4), p. 040. , (NNPDF Collaboration)
  • Lai, H.-L., Guzzi, M., Huston, J., Li, Z., Nadolsky, P.M., Pumplin, J., Yuan, C.-P., New parton distributions for collider physics (2010) Phys. Rev. D, 82, p. 074024
  • Frixione, S., Ridolfi, G., Nason, P., A positive-weight next-to-leading-order Monte Carlo for heavy flavour hadroproduction J. High Energy Phys., 2007 (9), p. 126
  • Re, E., Single-top Wt-channel production matched with parton showers using the POWHEG method (2011) Eur. Phys. J. C, 71, p. 1547
  • Alioli, S., Nason, P., Oleari, C., Re, E., NLO single-top production matched with shower in POWHEG: (Equation presented)- and (Equation presented)-channel contributions J. High Energy Phys., 2009 (9), p. 111
  • Frederix, R., Re, E., Torrielli, P., Single-top t-channel hadroproduction in the four-flavour scheme with POWHEG and aMC@NLO J. High Energy Phys., 2012 (9), p. 130
  • Combined Measurement of the Higgs Boson Mass in (Equation presented) Collisions at (Equation presented) and 8 TeV with the ATLAS and CMS Experiments (2015) Phys. Rev. Lett., 114, p. 191803. , ATLAS and CMS Collaborations
  • Frixione, S., Hirschi, V., Pagani, D., Shao, H.-S., Zaro, M., Electroweak and QCD corrections to top-pair hadroproduction in association with heavy bosons J. High Energy Phys., 2015 (6), p. 184
  • (2015), https://cds.cern.ch/record/2037717, ATLAS Collaboration, Report No. ATL-PHYS-PUB-2015-026; Muon reconstruction performance of the ATLAS detector in proton-proton collision data at (Equation presented) (2016) Eur. Phys. J. C, 76, p. 292. , ATLAS Collaboration
  • Electron efficiency measurements with the ATLAS detector using 2012 LHC proton-proton collision data (2017) Eur. Phys. J. C, 77, p. 195. , ATLAS Collaboration
  • (2016), https://cds.cern.ch/record/2157687, ATLAS Collaboration, Report No. ATLAS-CONF-2016-024; (2015), https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PUBNOTES/ATL-PHYS-PUB-2015-045, ATLAS Collaboration, Report No. ATL-PHYS-PUB-2015-045; (2017), https://cds.cern.ch/record/2261772, ATLAS Collaboration, Report No. ATLAS-CONF-2017-029; Topological cell clustering in the ATLAS calorimeters and its performance in LHC run 1 (2017) Eur. Phys. J. C, 77, p. 490. , ATLAS Collaboration
  • (2015), https://cds.cern.ch/record/2044564, ATLAS Collaboration, Report No. ATL-PHYS-PUB-2015-036; Cacciari, M., Salam, G.P., Soyez, G., The anti-(Equation presented) jet clustering algorithm J. High Energy Phys., 2008 (4), p. 063
  • Cacciari, M., Salam, G.P., Soyez, G., FastJet user manual (2012) Eur. Phys. J. C, 72, p. 1896
  • Jet energy scale measurements and their systematic uncertainties in proton-proton collisions at (Equation presented) with the ATLAS detector (2017) Phys. Rev. D, 96, p. 072002. , ATLAS Collaboration
  • Performance of pile-up mitigation techniques for jets in (Equation presented) collisions at (Equation presented) using the ATLAS detector (2016) Eur. Phys. J. C, 76, p. 581. , ATLAS Collaboration
  • Performance of b-jet identification in the ATLAS experiment (2016) J. Instrum., 11, p. P04008. , ATLAS Collaboration
  • (2015), https://cds.cern.ch/record/2037697, ATLAS Collaboration, Report No. ATL-PHYS-PUB-2015-022; (2016), https://cds.cern.ch/record/2160731, ATLAS Collaboration, Report No. ATL-PHYS-PUB-2016-012; Measurement of the inclusive isolated prompt photon cross section in (Equation presented) collisions at (Equation presented) with the ATLAS detector (2011) Phys. Rev. D, 83, p. 052005. , ATLAS Collaboration
  • Cacciari, M., Salam, G.P., Soyez, G., The catchment area of jets J. High Energy Phys., 2008 (4), p. 005
  • (2015), https://cds.cern.ch/record/2037904, ATLAS Collaboration, Report No. ATL-PHYS-PUB-2015-027; (2015), https://cds.cern.ch/record/2037700, ATLAS Collaboration, Report No. ATL-PHYS-PUB-2015-023; Hoecker, A., TMVA - Toolkit for Multivariate Data Analysis
  • Chen, T., Guestrin, C., XGBoost: A Scalable Tree Boosting System
  • Dannheim, D., Voigt, A., Grahn, K.-J., Speckmayer, P., Carli, T., PDE-Foam: A probability density estimation method using self-adapting phase-space binning (2009) Nucl. Instrum. Methods Phys. Res., Sect. A, 606, p. 717
  • Search for flavour-changing neutral current top quark decays (Equation presented) in (Equation presented) collisions at (Equation presented) with the ATLAS detector J. High Energy Phys., 2015 (12), p. 001. , ATLAS Collaboration
  • Measurement of the top quark-pair production cross section with ATLAS in (Equation presented) collisions at (Equation presented) (2011) Eur. Phys. J. C, 71, p. 1577. , ATLAS Collaboration
  • Measurement of the top quark pair production cross section in (Equation presented) collisions at (Equation presented) in dilepton final states with ATLAS (2012) Phys. Lett. B, 707, p. 459. , ATLAS Collaboration
  • Study of the material of the ATLAS inner detector for run 2 of the LHC (2017) J. Instrum., 12, p. P12009. , ATLAS Collaboration
  • Measurement of the (Equation presented) production cross section in proton-proton collisions at (Equation presented) with the ATLAS detector J. High Energy Phys., 2017 (11), p. 086. , ATLAS Collaboration
  • Luminosity determination in (Equation presented) collisions at (Equation presented) using the ATLAS detector at the LHC (2016) Eur. Phys. J. C, 76, p. 653. , ATLAS Collaboration
  • Jet energy measurement and its systematic uncertainty in proton-proton collisions at (Equation presented) with the ATLAS detector (2015) Eur. Phys. J. C, 75, p. 17. , ATLAS Collaboration
  • Jet energy resolution in proton-proton collisions at (Equation presented) recorded in 2010 with the ATLAS detector (2013) Eur. Phys. J. C, 73, p. 2306. , ATLAS Collaboration
  • Barlow, R.J., Beeston, C., Fitting using finite Monte Carlo samples (1993) Comput. Phys. Commun., 77, p. 219
  • Cowan, G., Cranmer, K., Gross, E., Vitells, O., Asymptotic formulae for likelihood-based tests of new physics (2011) Eur. Phys. J. C, 71, p. 1554
  • Cowan, G., Cranmer, K., Gross, E., Vitells, O., Erratum (2013) Eur. Phys. J. C, 73, p. 2501
  • Read, A.L., Presentation of search results: The CL(s) technique (2002) J. Phys. G, 28, p. 2693
  • https://cds.cern.ch/record/2202407, ATLAS Collaboration, Report No. ATL-GEN-PUB-2016-002

Citas:

---------- APA ----------
(2018) . Evidence for the associated production of the Higgs boson and a top quark pair with the ATLAS detector. Physical Review D, 97(7).
http://dx.doi.org/10.1103/PhysRevD.97.072003
---------- CHICAGO ----------
Aaboud, M. "Evidence for the associated production of the Higgs boson and a top quark pair with the ATLAS detector" . Physical Review D 97, no. 7 (2018).
http://dx.doi.org/10.1103/PhysRevD.97.072003
---------- MLA ----------
Aaboud, M. "Evidence for the associated production of the Higgs boson and a top quark pair with the ATLAS detector" . Physical Review D, vol. 97, no. 7, 2018.
http://dx.doi.org/10.1103/PhysRevD.97.072003
---------- VANCOUVER ----------
Aaboud, M. Evidence for the associated production of the Higgs boson and a top quark pair with the ATLAS detector. Phy. Rev. D. 2018;97(7).
http://dx.doi.org/10.1103/PhysRevD.97.072003