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Abstract:

The number of charged particles inside jets is a widely used discriminant for identifying the quark or gluon nature of the initiating parton and is sensitive to both the perturbative and non-perturbative components of fragmentation. This paper presents a measurement of the average number of charged particles with >500 pT > 500 {\\mathrm{MeV}} MeV  inside high-momentum jets in dijet events using 20.3 fb -1 of data recorded with the ATLAS detector in pp collisions at √s = 8 TeV  collisions at the LHC. The jets considered have transverse momenta from 50 GeV  up to and beyond 1.5 TeV. The reconstructed charged-particle track multiplicity distribution is unfolded to remove distortions from detector effects and the resulting charged-particle multiplicity is compared to several models. Furthermore, quark and gluon jet fractions are used to extract the average charged-particle multiplicity for quark and gluon jets separately. © 2016, CERN for the benefit of the ATLAS collaboration.

Registro:

Documento: Artículo
Título:Measurement of the charged-particle multiplicity inside jets from √s = 8 TeV pp collisions with the ATLAS detector
Autor:Atlas Collaboration et al.
Este artículo contiene 2869 autores, consultelos en el artículo en formato pdf.
Filiación: Este artículo contiene 2869 autores con sus filiaciones, consultelas en el artículo en formato pdf.
Año:2016
Volumen:76
Número:6
Página de inicio:1
Página de fin:23
DOI: http://dx.doi.org/10.1140/epjc/s10052-016-4126-5
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_n6_p1_AtlasCollaboration

Referencias:

  • Ellis, R., Stirling, W., Webber, B., (2003) QCD and Collider Physics, , Cambridge University Press, Cambridge
  • (2014) Eur. Phys. J. C, , ATLAS Collaboration, Light-quark and gluon jet discrimination in pp collisions at s= 7 TeV with the ATLAS detector.74, 3023. [hep-ex]
  • (2015) JHEP, , ATLAS Collaboration, Search for high-mass diboson resonances with boson-tagged jets in proton–proton collisions at √s = 8 TeV with the ATLAS detector. 12, 055. [hep-ex]
  • (2015) Eur. Phys. J. C, , ATLAS Collaboration, Jet energy measurement and its systematic uncertainty in proton–proton collisions at √s = 7 TeV with the ATLAS detector. 75, 17 [hep-ex]
  • CMS Collaboration, Search for the standard model Higgs boson produced through vector boson fusion and decaying to bb¯ Phys. Rev. D 92, 032008 (2015). [hep-ex]; (2015) Eur. Phys. J. C, , CMS Collaboration, Measurement of electroweak production of two jets in association with a Z boson in proton–proton collisions at √s = 8 TeV. 75, 66. [hep-ex]
  • UA1 Collaboration, Analysis of the fragmentation properties of quark and gluon jets at the CERN SPS pp collider (1986) Nucl. Phys. B, 276, p. 253
  • UA2 Collaboration, Measurement of jet fragmentation properties at the CERN pp¯ collider (1984) Phys. Lett. B, 144, p. 291
  • Measurement of production and properties of jets at the CERN pp¯ collider (1983) Z. Phys. B, 20, p. 117
  • Collabortion, J.A.D.E., Bartel, W., Experimental evidence for differences in ⟨p⊥ ⟩ between quark jets and gluon jets (1983) Phys. Lett. B, 123, p. 460
  • (1989) Z. Phys. C, 45, pp. 193-208
  • Collaboration, H.R.S., Derrick, M., Comparison of charged particle multiplicities in quark and gluon jets produced in e + e-annihilation at 29 GeV (1985) Phys. Lett. B, 165, p. 449
  • Inclusive charged-particle distribution in nearly threefold-symmetric three-jet events at{E}_{{c. m.}}=29 Ec. m. = 29 GeV (1985) Phys. Rev. Lett, 55, p. 1954
  • SLD Collaboration, K. Abe et al., Measurement of the charged multiplicity of Z 0 → bb¯ events. Phys. Rev. Lett. 72, 3145 (1994). [hep-ex]; (1996) Phys. Lett. B, , SLD Collaboration, K. Abe et al., Measurement of the charged multiplicities in b, c and light quark events from Z 0 decays. 386, 475
  • Collaboration, A.M.Y., Kim, Y.K., Comparison of quark and gluon jets produced in high-energye + e - annihilations (1989) Phys. Rev. Lett., 63, p. 1772
  • CLEO Collaboration, S. Alam et al., Study of gluon versus quark fragmentation in Υ → gg γ and e + e -→ qq¯ γevents at s = 10 GeV Phys. Rev. D 56, 17 (1997). [hep-ex]; Alexander, G., A Direct observation of quark-gluon jet differences at LEP (1991) Phys. Lett. B, 265, pp. 462-474
  • Alexander, G., A study of differences between quark and gluon jets using vertex tagging of quark jets (1993) Z. Phys. C, 58, p. 387
  • Akers, R., A model independent measurement of quark and gluon jet properties and differences (1995) Z. Phys. V, 68, p. 179
  • (1995) Phys. Lett. B, 346, p. 389
  • Alexander, G., Test of QCD analytic predictions for the multiplicity ratio between gluon and quark jets (1996) Phys. Lett. B, 388, p. 659
  • (1996) Phys. Lett. B, 384, p. 353
  • (1996) Z. Phys B, 70, p. 179
  • OPAL Collaboration, K. Ackerstaff et al., Multiplicity distributions of gluon and quark jets and tests of QCD analytic predictions. Eur. Phys. J. C 1, 479 (1998). [hep-ex]; (1999) Phys. Lett. B, , DELPHI Collaboration, P. Abreu et al., The scale dependence of the hadron multiplicity in quark and gluon jets and a precise determination of C A /C F .449, 383. [hep-ex]
  • (1999) Phys. J. C, , OPAL Collaboration, G. Abbiendi et al., Experimental properties of gluon and quark jets from a point source. Eur. 11, 217. [hep-ex]
  • Akrawy, M.Z., A study of coherence of soft gluons in hadron jets (1990) Phys. Lett. B, 247, p. 617
  • (2004) Eur. Phys. J. C, , OPAL Collaboration, G. Abbiendi et al., Scaling violations of quark and gluon jet fragmentation functions in e+e-annihilations at sqrt{s} = 91.2 s= 91.2 and 183.209 GeV.37, 25.[hep-ex]
  • Collaboration, C.D.F., Affolder, T., Charged particle multiplicity in jets in Pp¯ collisions at s= 1.8 TeV (2001) Phys. Rev. Lett., 87, p. 211804
  • (2011) Phys. Rev. D, , ATLAS Collaboration, Properties of jets measured from tracks in proton–proton collisions at center-of-mass energy s= 7 TeV with the ATLAS detector. 84, 054001. [hep-ex]
  • (2011) Eur. Phys. J. C, , ATLAS Collaboration, Measurement of the jet fragmentation function and transverse profile in proton–proton collisions at a center-of-mass energy of 7 TeV with the ATLAS detector.71, 1795. [hep-ex]
  • (2012), CMS Collaboration, Shape, transverse size, and charged hadron multiplicity of jets in pp collisions at 7 TeV. JHEP 06, 160.[hep-ex]; The ATLAS experiment at the CERN large hadron collider (2008) JINST, 3
  • (2015), ATLAS Collaboration, Measurement of jet charge in dijet events from s=8 TeV pp collisions with the ATLAS detector. [hep-ex]; Cacciari, M., Salam, G.P., Soyez, G., The anti-k(t) jet clustering algorithm (2008) JHEP, 4, p. 063. , arXiv:0802.1189 [hep-ph]
  • Cacciari, M., Salam, G.P., Soyez, G., FastJet user manual (2012) Eur. Phys. J. C, 72, p. 1896. , arXiv:1111.6097 [hep-ph]
  • (2008) Calorimeter clustering algorithms: description and performance
  • (2004) Nucl. Instrum. Meth. A, , 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
  • (2009) Local hadronic calibration, , ATLAS Collaboration
  • ATLAS Collaboration, Performance of pile-up mitigation techniques for jets in pp collisions at s= 8 TeV using the ATLAS detector (2015). [hep-ex]; Cacciari, M., Salam, G.P., Soyez, G., (2008) The catchment area of jets. JHEP, 4, p. 005
  • Sjöstrand, T., Mrenna, S., Skands, P.Z., Brief, A., Introduction to PYTHIA 8.1 (2008) Comput. Phys. Commun., 178, p. 852. , arXiv:0710.3820 [hep-ph]
  • (2012) Summary of ATLAS Pythia 8 tunes, , ATLAS Collaboration
  • Bähr, M., Herwig++ physics and manual (2008) Eur. Phys. J. C, 58, pp. 639-707. , arXiv:0803.0883 [hep-ph]
  • Gieseke, S., Röhr, C., Siodmok, A., Colour reconnections in Herwig++ (2012) Eur. Phys. J. C, 72, p. 2225. , arXiv:1206.0041 [hep-ph]
  • (2010) Eur. Phys. J. C, , ATLAS Collaboration, The ATLAS simulation infrastructure. 70, 823. [physics.ins-det]
  • Agostinelli(GEANT4 Collaboration), GEANT4: a simulation toolkit (2003) Nucl. Instrum. Meth. A, 506, p. 250
  • Martin, A.D., Parton distributions for the LHC (2009) Eur. Phys. J. C, 63, pp. 189-285. , arXiv:0901.0002 [hep-ph]
  • Gao, J., CT10 next-to-next-to-leading order global analysis of QCD (2014) Phys. Rev. D, 89, p. 033009. , arXiv:1302.6246 [hep-ph]
  • Ball, R.D., Parton distributions with LHC data (2013) Nucl. Phys. B, 867, p. 244. , arXiv:1207.1303 [hep-ph]
  • Skands, P., Carrazza, S., Rojo, J., Tuning PYTHIA 8.1: the Monash 2013 tune (2014) Eur. Phys. J. C, 74, p. 3024. , arXiv:1404.5630 [hep-ph]
  • (2014) ATLAS Run 1 Pythia 8 tunes, , ATLAS Collaboration
  • (2012), K. Arnold et al., Herwig++ 2.6 release note. [hep-ph]; (2003), D. Stump et al., Inclusive jet production, parton distributions, and the search for new physics. JHEP 10, 046.[hep-ph]; (2013), J. Bellm et al., Herwig++ 2.7 release note; Seymour, M.H., Siodmok, A., Constraining MPI models using σeff and recent tevatron and LHC underlying event data (2013) JHEP, 10, p. 113. , arXiv:1307.5015 [hep-ph]
  • (2006), T. Sjöstrand, S. Mrenna, P.Z. Skands, PYTHIA 6.4 physics and manual. JHEP 05, 026. [hep-ph]; Skands, P.Z., Tuning monte carlo generators: the Perugia tunes (2010) Phys. Rev. D, 82, p. 074018. , arXiv:1005.3457 [hep-ph]
  • (2006), A. Banfi, G.P. Salam, G. Zanderighi, Infrared safe definition of jet flavor. Eur. Phys. J. C 47, 113. [hep-ph]; D’Agostini, G., A multidimensional unfolding method based on Bayes’ theorem (1995) Nucl. Instrum. Meth., A362, p. 487
  • (2011) Unfolding algorithms and tests using RooUnfold, , T. Adye, [physics.data-an]
  • (2009), B. Malaescu, An iterative, dynamically stabilized method of data unfolding. [physics.data-an]; Buckley, A., LHAPDF6: parton density access in the LHC precision era (2015) Eur. Phys. J. C, 75, p. 132. , arXiv:1412.7420 [hep-ph]
  • Larkoski, A.J., Marzani, S., Thaler, J., Sudakov safety in perturbative QCD (2015) Phys. Rev. D, 91, p. 111501. , arXiv:1502.01719 [hep-ph]
  • (2000) Phys. Rev. D 61, , A. Capella et al., Evolution of average multiplicities of quark and gluon jets.074009. [hep-ph]
  • (1999) Phys. Lett. B, , I.M. Dremin, J.W. Gary, Energy dependence of mean multiplicities in gluon and quark jets at the next-to-next-to-next-to leading order.459, 341;

Citas:

---------- APA ----------
(2016) . Measurement of the charged-particle multiplicity inside jets from √s = 8 TeV pp collisions with the ATLAS detector. European Physical Journal C, 76(6), 1-23.
http://dx.doi.org/10.1140/epjc/s10052-016-4126-5
---------- CHICAGO ----------
Atlas Collaboration. "Measurement of the charged-particle multiplicity inside jets from √s = 8 TeV pp collisions with the ATLAS detector" . European Physical Journal C 76, no. 6 (2016) : 1-23.
http://dx.doi.org/10.1140/epjc/s10052-016-4126-5
---------- MLA ----------
Atlas Collaboration. "Measurement of the charged-particle multiplicity inside jets from √s = 8 TeV pp collisions with the ATLAS detector" . European Physical Journal C, vol. 76, no. 6, 2016, pp. 1-23.
http://dx.doi.org/10.1140/epjc/s10052-016-4126-5
---------- VANCOUVER ----------
Atlas Collaboration. Measurement of the charged-particle multiplicity inside jets from √s = 8 TeV pp collisions with the ATLAS detector. Eur. Phys. J. C. 2016;76(6):1-23.
http://dx.doi.org/10.1140/epjc/s10052-016-4126-5