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:

The distribution of particles inside hadronic jets produced in the decay of boosted W and Z bosons can be used to discriminate such jets from the continuum background. Given that a jet has been identified as likely resulting from the hadronic decay of a boosted W or Z boson, this paper presents a technique for further differentiating Z bosons from W bosons. The variables used are jet mass, jet charge, and a b-tagging discriminant. A likelihood tagger is constructed from these variables and tested in the simulation of W ′ → WZ for bosons in the transverse momentum range 200 GeV < pT < 400 GeV in s= 8 TeV pp collisions with the ATLAS detector at the LHC. For Z-boson tagging efficiencies of ϵZ = 90 , 50, and 10 % , one can achieve W + -boson tagging rejection factors (1 / ϵW + ) of 1.7, 8.3 and 1000, respectively. It is not possible to measure these efficiencies in the data due to the lack of a pure sample of high pT , hadronically decaying Z bosons. However, the modelling of the tagger inputs for boosted W bosons is studied in data using a tt¯ -enriched sample of events in 20.3 fb - 1 of data at s= 8 TeV. The inputs are well modelled within uncertainties, which builds confidence in the expected tagger performance. © 2016, CERN for the benefit of the ATLAS collaboration.

Registro:

Documento: Artículo
Título:A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector
Autor:Atlas Collaboration et al.
Este artículo contiene 2859 autores, consultelos en el artículo en formato pdf.
Filiación: Este artículo contiene 2859 autores con sus filiaciones, consultelas en el artículo en formato pdf.
Año:2016
Volumen:76
Número:5
DOI: http://dx.doi.org/10.1140/epjc/s10052-016-4065-1
Título revista:European Physical Journal C
Título revista abreviado:Eur. Phys. J. C
ISSN:14346044
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14346044_v76_n5_p_AtlasCollaboration

Referencias:

  • A. Altheimer et al., Boosted objects and jet substructure at the LHC. Report of BOOST2012, held at IFIC Valencia, 23rd–27th of July 2012. Eur. Phys. J. C 74, 2792 (2014). [hep-ex]; ATLAS Collaboration, Performance of Boosted W Boson Identification with the ATLAS Detector (2014); C.M.S. Collaboration, Identification techniques for highly boosted W bosons that decay into hadrons. JHEP 1412, 017 (2014). [hep-ex]; Glashow, S.L., Iliopoulos, J., Maiani, L., Weak interactions with lepton–hadron symmetry (1970) Phys. Rev. D, 2, pp. 1285-1292
  • ATLAS Collaboration, A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at s= 7 TeV. JHEP 1209, 139 (2012). [hep-ex]; CMS Collaboration, Search for flavor-changing neutral currents in top-quark decays t→ Zqpp collisions at s=8 TeV. Phys. Rev. Lett. 112, 171802 (2014). [hep-ex]; Sjöstrand, T., Mrenna, S., Skands, P.Z., A brief introduction to PYTHIA 8.1 Comput. Phys. Commun, 1, p. 036
  • H.-L. Lai et al., New parton distributions for collider physics. Phys. Rev. D 82, 074024 (2010); J. Gao et al., CT10 next-to-next-to-leading order global analysis of QCD. Phys. Rev. D 89, 033009 (2014); https://cdsweb.cern.ch/record/1474107, ATLAS Collaboration, Summary of ATLAS Pythia 8 Tunes. (2012); T. Sjöstrand, P.Z. Skands, Transverse-momentum-ordered showers and interleaved multiple interactions. Eur. Phys. J. C 39, 129–154 (2005); Andersson, B., Parton fragmentation and string dynamics (1983) Phys. Rep., 97, p. 31
  • M. Bähr et al., Herwig++ physics and manual. Eur. Phys. J. C 58, 639–707 (2008); S. Gieseke, P. Stephens, B. Webber, New formalism for QCD parton showers. JHEP 0312, 045 (2003); Webber, B., A QCD model for jet fragmentation including soft gluon interference (1984) Nucl. Phys. B, 238, p. 492
  • S. Gieseke, C. Rohr, A. Siodmok, Colour reconnections in Herwig++. Eur. Phys. J. C 72, 2225 (2012); P. Nason, A new method for combining NLO QCD with shower Monte Carlo algorithms. JHEP 0411, 040 (2004); S. Frixione, P. Nason, C. Oleari, Matching NLO QCD computations with Parton Shower simulations: the POWHEG method. JHEP 0711, 070 (2007); S. Alioli et al., A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX. JHEP 1006, 043 (2010); Sjöstrand, T., Mrenna, S., Skands, P., PYTHIA 6.4 physics and manual (2006) JHEP, 605, p. 026
  • S. Frixione et al., Single-top hadroproduction in association with a W boson. JHEP 0807, 029 (2008); M.L. Mangano et al., ALPGEN, a generator for hard multiparton processes in hadronic collisions. JHEP 0307, 001 (2003); J. Pumplin et al., New generation of parton distributions with uncertainties from global QCD analysis. JHEP 0207, 012 (2002). [hep-ph]; G. Corcella et al., HERWIG 6.5 release note (2002); (2011) New ATLAS event generator tunes to 2010 data, , https://cds.cern.ch/record/1345343
  • P.Z. Skands, Tuning Monte Carlo generators: the Perugia tunes. Phys. Rev. D 82, 074018 (2010). [hep-ph]; ATLAS Collaboration, The ATLAS simulation infrastructure. Eur. Phys. J. C 70, 823 (2010). [hep-ex]; Agostinelli, S., GEANT4 Collaboration, Geant4—a simulation toolkit (2003) Nucl. Instrum. Meth. A, 506, p. 250
  • Olive, K.A., Particle Data Group, The review of particle physics (2014) Chin. Phys. C, 38 (90001)
  • Cabibbo, N., Unitary symmetry and leptonic decays (1963) Phys. Rev. Lett., 10, pp. 531-533
  • Kobayashi, M., Maskawa, T., CP violation in the renormalizable theory of weak interaction (1973) Prog. Theor. Phys, 49, pp. 652-657
  • The ATLAS experiment at the CERN Large Hadron Collider (2008) JINST, 3
  • https://cdsweb.cern.ch/record/1099735, ATLAS Collaboration, Calorimeter Clustering Algorithms: Description and Performance (2008); C. Cojocaru et al., Hadronic calibration of the ATLAS liquid argon end-cap calorimeter in the pseudorapidity region 1.6 <η> 1.8 in beam tests. Nucl. Instrum. Meth. A 531, 481 (2004); https://cdsweb.cern.ch/record/1112035, ATLAS Collaboration, Local Hadronic Calibration (2009); M. Cacciari, G.P. Salam, G. Soyez, The anti-k(t) jet clustering algorithm. JHEP 0804, 063 (2008). [hep-ph]; D. Krohn, J. Thaler, L.-T. Wang, Jet trimming. JHEP 1002, 084 (2010). [hep-ph]; (2013) Pile-up subtraction and suppression for jets in ATLAS, , https://cdsweb.cern.ch/record/1570994
  • M. Cacciari, G.P. Salam, G. Soyez, The catchment area of jets. JHEP 0804, 005 (2008). [hep-ph]; Field, R.D., Feynman, R.P., A parameterization of the properties of quark jets (1978) Nucl. Phys. B, 136, p. 1
  • https://cdsweb.cern.ch/record/1572980, ATLAS Collaboration, Jet charge studies with the ATLAS detector using s= 8 TeV proton–proton collision data (2013); ATLAS Collaboration, Calibration of b-tagging using dileptonic top pair events in a combinatorial likelihood approach with the ATLAS experiment (2014); https://cdsweb.cern.ch/record/1741020, ATLAS Collaboration, Calibration of the performance of b-tagging for c and light-flavour jets in the 2012 ATLAS data (2014); ATLAS Collaboration, Performance of jet substructure techniques for large-R jets in proton–proton collisions ats= 7 TeV using the ATLAS detector. JHEP 1309, 076 (2013). [hep-ex]; ATLAS Collaboration, Jet mass and substructure of inclusive jets ins= 7 TeV pp collisions with the ATLAS experiment. JHEP 1205, 128 (2012). [hep-ex]; ATLAS Collaboration, Charged-particle multiplicities in pp interactions measured with the ATLAS detector at the LHC. N. J. Phys. 13, 053033 (2011). [hep-ex]; ATLAS Collaboration, Measurements of normalized differential cross sections for tt¯ production in pp collisions at s= 7 TeV using the ATLAS detector. Phys. Rev. D 90, 072004 (2014). [hep-ex]; CMS Collaboration, Measurement of masses in the tt¯ system by kinematic endpoints in pp collisions at s=7 TeV. Eur. Phys. J. C 73, 2494 (2013). [hep-ex]; ATLAS Collaboration, Light-quark and gluon jet discrimination in pp collisions at s=7 Te with the ATLAS detector. Eur. Phys. J. C 74, 3023 (2014). [hep-ex]; ATLAS Collaboration, Measurement of the WW + WZ cross section and limits on anomalous triple gauge couplings using final states with one lepton, missing transverse momentum, and two jets with the ATLAS detector at s = 7 TeV. JHEP 1501, 049 (2015). [hep-ex]

Citas:

---------- APA ----------
(2016) . A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector. European Physical Journal C, 76(5).
http://dx.doi.org/10.1140/epjc/s10052-016-4065-1
---------- CHICAGO ----------
Atlas Collaboration. "A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector" . European Physical Journal C 76, no. 5 (2016).
http://dx.doi.org/10.1140/epjc/s10052-016-4065-1
---------- MLA ----------
Atlas Collaboration. "A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector" . European Physical Journal C, vol. 76, no. 5, 2016.
http://dx.doi.org/10.1140/epjc/s10052-016-4065-1
---------- VANCOUVER ----------
Atlas Collaboration. A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector. Eur. Phys. J. C. 2016;76(5).
http://dx.doi.org/10.1140/epjc/s10052-016-4065-1