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 flavour changing neutral current (FCNC) processes in top-quark decays by the ATLAS Collaboration is presented. Data collected from pp collisions at the LHC at a centre-of-mass energy of √s = 7 TeV during 2011, corresponding to an integrated luminosity of 2.1 fb -1 , were used. A search was performed for top-quark pair-production events, with one top quark decaying through the t → Zq FCNC (q = u, c) channel, and the other through the Standard Model dominant mode t → Wb. Only the decays of the Z boson to charged leptons and leptonic W-boson decays were considered as signal. Consequently, the final-state topology is characterised by the presence of three isolated charged leptons, at least two jets and missing transverse momentum from the undetected neutrino. No evidence for an FCNC signal was found. An upper limit on the t → Zq branching ratio of BR(t → Zq) < 0.73% is set at the 95% confidence level. Copyright CERN.

Registro:

Documento: Artículo
Título:A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at √s = 7 TeV
Autor:Aad, G. et al.
Este artículo contiene 2864 autores, consultelos en el artículo en formato pdf.
Filiación: Este artículo contiene 2864 autores con sus filiaciones, consultelas en el artículo en formato pdf.
Palabras clave:Flavour changing neutral currents; Hadron hadron scattering; Rare decays; Top physics
Año:2012
Volumen:2012
Número:9
Página de inicio:1
Página de fin:36
DOI: http://dx.doi.org/10.1007/JHEP09(2012)139
Título revista:Journal of High Energy Physics
Título revista abreviado:J. High Energy Phys.
ISSN:11266708
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11266708_v2012_n9_p1_Aad

Referencias:

  • Combination of CDF and D0 Results on the Mass of the Top Quark Using Up to 5.8 Fb -1 of Data, , TEVATRON ELECTROWEAK WORKING GROUP, CDF and D0 collaboration, arXiv:1107.5255 [INSPIRE]
  • Glashow, S., Iliopoulos, J., Maiani, L., Weak interactions with lepton-hadron symmetry (1970) Phys. Rev., D 2, p. 1285. , INSPIRE
  • Aguilar-Saavedra, J., Nobre, B., Rare top decays t → cγ, t → cg and CKM unitarity (2003) Phys. Lett., B 553, p. 251. , [hep-ph/0210360] [INSPIRE]
  • Del Aguila, F., Aguilar-Saavedra, J.A., Miquel, R., Constraints on top couplings in models with exotic quarks (1999) Phys. Rev. Lett., 82, p. 1628. , [hep-ph/9808400] [INSPIRE]
  • Aguilar-Saavedra, J.A., Effects of mixing with quark singlets (2003) Phys. Rev., D 67, p. 035003. , [Erratum ibid. D 69 (2004) 099901] [hep-ph/0210112] [INSPIRE]
  • Cheng, T.P., Sher, M., Mass matrix ansatz and flavor nonconservation in models with multiple Higgs doublets (1987) Phys. Rev., D 35, p. 3484. , INSPIRE
  • Grzadkowski, B., Gunion, J.F., Krawczyk, P., Neutral current flavor changing decays for the Z boson and the top quark in two Higgs doublet models (1991) Phys. Lett., B 268, p. 106. , INSPIRE
  • Luke, M.E., Savage, M.J., Flavor changing neutral currents in the Higgs sector and rare top decays (1993) Phys. Lett., B 307, p. 387. , [hep-ph/9303249] [INSPIRE]
  • Atwood, D., Reina, L., Soni, A., Probing flavor changing top-charm-scalar interactions in e + e - collisions (1996) Phys. Rev., D 53, p. 1199. , [hep-ph/9506243] [INSPIRE]
  • Atwood, D., Reina, L., Soni, A., Phenomenology of two Higgs doublet models with flavor changing neutral currents (1997) Phys. Rev., D 55, p. 3156. , [hep-ph/9609279] [INSPIRE]
  • Bejar, S., Guasch, J., Solà, J., Loop induced flavor changing neutral decays of the top quark in a general two Higgs doublet model (2001) Nucl. Phys., B 600, p. 21. , [hep-ph/0011091] [INSPIRE]
  • Li, C.S., Oakes, R.J., Yang, J.M., Rare decay of the top quark in the minimal supersymmetric model (1994) Phys. Rev., D 49, p. 293. , [Erratum ibid. D 56 (1997) 3156] [INSPIRE]
  • De Divitiis, G., Petronzio, R., Silvestrini, L., Flavor changing top decays in supersymmetric extensions of the standard model (1997) Nucl. Phys., B 504, p. 45. , [hep-ph/9704244] [INSPIRE]
  • Lopez, J.L., Nanopoulos, D.V., Rangarajan, R., New supersymmetric contributions to t → cV (1997) Phys. Rev., D 56, p. 3100. , [hep-ph/9702350] [INSPIRE]
  • Guasch, J., Solà, J., FCNC top quark decays: A door to SUSY physics in high luminosity colliders? (1999) Nucl. Phys., B 562, p. 3. , [hep-ph/9906268] [INSPIRE]
  • Delepine, D., Khalil, S., Top flavor violating decays in general supersymmetric models (2004) Phys. Lett., B 599, p. 62. , [hep-ph/0406264] [INSPIRE]
  • Liu, J.J., Li, C.S., Yang, L.L., Jin, L.G., t → cV via SUSY FCNC couplings in the unconstrained MSSM (2004) Phys. Lett., B 599, p. 92. , [hep-ph/0406155] [INSPIRE]
  • Cao, J., SUSY-induced FCNC top-quark processes at the Large Hadron Collider (2007) Phys. Rev., D 75, p. 075021. , [hep-ph/0702264] [INSPIRE]
  • Yang, J.M., Young, B.-L., Zhang, X., Flavor changing top quark decays in R parity violating SUSY (1998) Phys. Rev., D 58, p. 055001. , [hep-ph/9705341] [INSPIRE]
  • Lu, G.-R., Yin, F.-R., Wang, X.-L., Wan, L.-D., The rare top quark decays t → cV in the topcolor assisted technicolor model (2003) Phys. Rev., D 68, p. 015002. , [hep-ph/0303122] [INSPIRE]
  • Agashe, K., Perez, G., Soni, A., Flavor structure of warped extra dimension models (2005) Phys. Rev., D 71, p. 016002. , [hep-ph/0408134] [INSPIRE]
  • Agashe, K., Perez, G., Soni, A., Collider signals of top quark flavor violation from a warped extra dimension (2007) Phys. Rev., D 75, p. 015002. , [hep-ph/0606293 ] [INSPIRE]
  • Abe, F., Search for flavor-changing neutral current decays of the top quark in pp̄ collisions at √s = 1.8 TeV (1998) Phys. Rev. Lett., 80, p. 2525. , CDF collaboration, INSPIRE
  • Aaltonen, T., Search for the flavor changing neutral current decay t → Zq in pp̄ collisions at √s = 1.96 TeV (2008) Phys. Rev. Lett., 101, p. 192002. , CDF collaboration, [arXiv:0805.2109] [INSPIRE]
  • Aaltonen, T., Search for top-quark production via flavor-changing neutral currents in W + 1 jet events at CDF (2009) Phys. Rev. Lett., 102, p. 151801. , CDF collaboration, [arXiv:0812.3400] [INSPIRE]
  • Abazov, V.M., Search for flavor changing neutral currents via quark-gluon couplings in single top quark production using 2.3 fb -1 of pp̄ collisions (2010) Phys. Lett., B 693, p. 81. , D0 collaboration, [arXiv:1006.3575] [INSPIRE]
  • Abazov, V.M., Search for flavor changing neutral currents in decays of top quarks (2011) Phys. Lett., B 701, p. 313. , D0 collaboration, [arXiv:1103.4574] [INSPIRE]
  • Heister, A., Search for single top production in e + e - collisions at √s up to 209 GeV (2002) Phys. Lett., B 543, p. 173. , ALEPH collaboration, [hep-ex/0206070] [INSPIRE]
  • Abdallah, J., Search for single top production via FCNC at LEP at √s = 189 GeV to 208 GeV (2004) Phys. Lett., B 590, p. 21. , DELPHI collaboration, [hep-ex/0404014] [INSPIRE]
  • Abbiendi, G., Search for single top quark production at LEP-2 (2001) Phys. Lett., B 521, p. 181. , OPAL collaboration, [hep-ex/0110009] [INSPIRE]
  • Achard, P., Search for single top production at LEP (2002) Phys. Lett., B 549, p. 290. , L3 collaboration, [hep-ex/0210041] [INSPIRE]
  • (2001) Search for Single Top Production Via Flavour Changing Neutral Currents: Preliminary Combined Results of the LEP Experiments, , LEP EXOTICA WG, LEP Exotica WG 2001-01
  • Beneke, M., Top Quark Physics, , hep-ph/0003033 [INSPIRE]
  • Abramowicz, H., Search for single-top production in ep collisions at HERA (2012) Phys. Lett., B 708, p. 27. , ZEUS collaboration, [arXiv:1111.3901] [INSPIRE]
  • Aaron, F., Search for single top quark production at HERA (2009) Phys. Lett., B 678, p. 450. , H1 collaboration, [arXiv:0904.3876] [INSPIRE]
  • Aktas, A., Search for single top quark production in ep collisions at HERA (2004) Eur. Phys. J., C 33, p. 9. , H1 collaboration, [hep-ex/0310032] [INSPIRE]
  • Chekanov, S., Search for single top production in ep collisions at HERA (2003) Phys. Lett., B 559, p. 153. , ZEUS collaboration, [hep-ex/0302010] [INSPIRE]
  • Aad, G., Search for FCNC single top-quark production at √s = 7 TeV with the ATLAS detector (2012) Phys. Lett., B 712, p. 351. , ATLAS collaboration, [arXiv:1203.0529] [INSPIRE]
  • Aad, G., The ATLAS experiment at the CERN Large Hadron Collider 2008 JINST, 3, pp. S08003. , ATLAS collaboration, INSPIRE
  • Aad, G., Luminosity determination in pp collisions at √s = 7 TeV using the ATLAS detector at the LHC (2011) Eur. Phys. J., C 71, p. 1630. , ATLAS collaboration, [arXiv:1101.2185] [INSPIRE]
  • Luminosity determination in pp collisions at √s = 7 TeV using the ATLAS Detector in 2011 ATLAS-CONF-2011-116 (2011), , ATLAS collaboration
  • Agostinelli, S., GEANT4: A simulation toolkit (2003) Nucl. Instrum. Meth., A 506, p. 250. , GEANT4 collaboration, INSPIRE
  • Aad, G., The ATLAS simulation Infrastructure (2010) Eur. Phys. J., C 70, p. 823. , ATLAS collaboration, [arXiv:1005.4568] [INSPIRE]
  • Slabospitsky, S., Sonnenschein, L., TopReX generator (version 3.25): Short manual (2002) Comput. Phys. Commun., 148, p. 87. , [hep-ph/0201292] [INSPIRE]
  • Sherstnev, A., Thorne, R., Parton distributions for LO generators (2008) Eur. Phys. J., C 55, p. 553. , [arXiv:0711.2473] [INSPIRE]
  • Sjöstrand, T., Mrenna, S., Skands, P.Z., PYTHIA 6.4 physics and manual (2006) JHEP, 5, p. 026. , [hep-ph/0603175] [INSPIRE]
  • Kersevan, B.P., Richter-Was, E., The Monte Carlo Event Generator AcerMC Version 2.0 with Interfaces to PYTHIA 6.2 and HERWIG 6.5, , hep-ph/0405247 [INSPIRE]
  • Skands, P.Z., Tuning Monte Carlo generators: The Perugia tunes (2010) Phys. Rev., D 82, p. 074018. , [arXiv:1005.3457] [INSPIRE]
  • Mangano, M.L., Moretti, M., Piccinini, F., Pittau, R., Polosa, A.D., ALPGEN, a generator for hard multiparton processes in hadronic collisions (2003) JHEP, 7, p. 001. , [hep-ph/0206293] [INSPIRE]
  • Pumplin, J., New generation of parton distributions with uncertainties from global QCD analysis (2002) JHEP, 7, p. 012. , [hep-ph/0201195] [INSPIRE]
  • Corcella, G., HERWIG 6: An event generator for hadron emission reactions with interfering gluons (including supersymmetric processes) (2001) JHEP, 1, p. 010. , [hep-ph/0011363] [INSPIRE]
  • Corcella, G., HERWIG 6.5 Release Note, , hep-ph/0210213 [INSPIRE]
  • Butterworth, J., Forshaw, J.R., Seymour, M., Multiparton interactions in photoproduction at HERA (1996) Z. Phys., C 72, p. 637. , [hep-ph/9601371] [INSPIRE]
  • (2010) First Tuning of HERWIG/JIMMY to ATLAS Data, , ATLAS collaboration, PHYS-PUB-2010-014
  • Frixione, S., Webber, B.R., Matching NLO QCD computations and parton shower simulations (2002) JHEP, 6, p. 029. , [hep-ph/0204244] [INSPIRE]
  • Frixione, S., Nason, P., Webber, B.R., Matching NLO QCD and parton showers in heavy flavor production (2003) JHEP, 8, p. 007. , [hep-ph/0305252] [INSPIRE]
  • Frixione, S., Laenen, E., Motylinski, P., Webber, B.R., Single-top production in MC@NLO (2006) JHEP, 3, p. 092. , [hep-ph/0512250] [INSPIRE]
  • Nadolsky, P.M., Implications of CTEQ global analysis for collider observables (2008) Phys. Rev., D 78, p. 013004. , [arXiv:0802.0007] [INSPIRE]
  • Aliev, M., HATHOR: HAdronic Top and Heavy quarks crOss section calculatoR (2011) Comput. Phys. Commun., 182, p. 1034. , [arXiv:1007.1327] [INSPIRE]
  • Kidonakis, N., Next-to-next-to-leading-order collinear and soft gluon corrections for t-channel single top quark production (2011) Phys. Rev., D 83, p. 091503. , [arXiv:1103.2792] [INSPIRE]
  • Kidonakis, N., NNLL resummation for s-channel single top quark production (2010) Phys. Rev., D 81, p. 054028. , [arXiv:1001.5034] [INSPIRE]
  • Kidonakis, N., Two-loop soft anomalous dimensions for single top quark associated production with a W - or H - (2010) Phys. Rev., D 82, p. 054018. , [arXiv:1005.4451] [INSPIRE]
  • Alwall, J., Demin, P., De Visscher, S., Frederix, R., Herquet, M., MadGraph/MadEvent v4: The new web generation (2007) JHEP, 9, p. 028. , [arXiv:0706.2334] [INSPIRE]
  • Aad, G., Measurement of the cross section for top-quark pair production in pp collisions at √s = 7 TeV with the ATLAS detector using final states with two high-pT leptons (2012) JHEP, 5, p. 059. , ATLAS collaboration, [arXiv:1202.4892] [INSPIRE]
  • Aad, G., Electron performance measurements with the ATLAS detector using the 2010 LHC proton-proton collision data (2012) Eur. Phys. J., C 72, p. 1909. , ATLAS collaboration, [arXiv:1110.3174] [INSPIRE]
  • Cacciari, M., Salam, G.P., Soyez, G., The anti-kt jet clustering algorithm (2008) JHEP, 4, p. 063. , [arXiv:0802.1189] [INSPIRE]
  • Aad, G., Jet Energy Measurement with the ATLAS Detector in Proton-proton Collisions at √S = 7 TeV, , ATLAS collaboration, arXiv:1112.6426 [INSPIRE]
  • Commissioning of the ATLAS high-performance b-tagging algorithms in the 7 TeV collision data ATLAS-CONF-2011-102 (2011), , ATLAS collaboration
  • Aad, G., Performance of missing transverse momentum reconstruction in proton-proton collisions at 7 TeV with ATLAS (2012) Eur. Phys. J., C 72, p. 1844. , ATLAS collaboration, [arXiv:1108.5602] [INSPIRE]
  • Aad, G., Measurement of the top quark-pair production cross section with ATLAS in pp collisions at √s = 7 TeV (2011) Eur. Phys. J., C 71, p. 1577. , ATLAS collaboration, [arXiv:1012.1792] [INSPIRE]
  • Feldman, G.J., Cousins, R.D., A unified approach to the classical statistical analysis of small signals (1998) Phys. Rev., D 57, p. 3873. , [physics/9711021] [INSPIRE]
  • Berends, F.A., Kuijf, H., Tausk, B., Giele, W., On the production of a W and jets at hadron colliders (1991) Nucl. Phys., B 357, p. 32. , INSPIRE
  • Ellis, S., Kleiss, R., Stirling, W.J., W's, Z's and Jets (1985) Phys. Lett., B 154, p. 435. , INSPIRE
  • Campbell, J.M., Ellis, R.K., MCFM for the Tevatron and the LHC (2010) Nucl. Phys. Proc. Suppl., B 205, p. 10
  • Junk, T., Confidence level computation for combining searches with small statistics (1999) Nucl. Instrum. Meth., A 434, p. 435. , [hep-ex/9902006] [INSPIRE]
  • Read, A.L., (2000) Modified Frequentist Analysis of Search Results (The CL s Method), , CERN-OPEN-2000-205

Citas:

---------- APA ----------
(2012) . A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at √s = 7 TeV. Journal of High Energy Physics, 2012(9), 1-36.
http://dx.doi.org/10.1007/JHEP09(2012)139
---------- CHICAGO ----------
Aad, G. "A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at √s = 7 TeV" . Journal of High Energy Physics 2012, no. 9 (2012) : 1-36.
http://dx.doi.org/10.1007/JHEP09(2012)139
---------- MLA ----------
Aad, G. "A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at √s = 7 TeV" . Journal of High Energy Physics, vol. 2012, no. 9, 2012, pp. 1-36.
http://dx.doi.org/10.1007/JHEP09(2012)139
---------- VANCOUVER ----------
Aad, G. A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at √s = 7 TeV. J. High Energy Phys. 2012;2012(9):1-36.
http://dx.doi.org/10.1007/JHEP09(2012)139