Exclusion of an Exotic Top Quark with -4/3 Electric Charge Using Soft Lepton Tagging

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We present a measurement of the electric charge of the top quark using p{bar p} collisions corresponding to an integrated luminosity of 2.7 fb{sup -1} at the CDF II detector. We reconstruct t{bar t} events in the lepton+jets final state and use kinematic information to determine which b-jet is associated with the leptonically- or hadronically-decaying t-quark. Soft lepton taggers are used to determine the b-jet flavor. Along with the charge of the W boson decay lepton, this information permits the reconstruction of the top quark's electric charge. Out of 45 reconstructed events with 2.4 {+-} 0.8 expected background events, 29 ... continued below

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7 pages

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Aaltonen, T.; Phys., /Helsinki Inst. of; Adelman, J.; /Chicago U., EFI; Alvarez Gonzalez, B.; Phys., /Oviedo U. /Cantabria Inst. of et al. June 1, 2010.

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We present a measurement of the electric charge of the top quark using p{bar p} collisions corresponding to an integrated luminosity of 2.7 fb{sup -1} at the CDF II detector. We reconstruct t{bar t} events in the lepton+jets final state and use kinematic information to determine which b-jet is associated with the leptonically- or hadronically-decaying t-quark. Soft lepton taggers are used to determine the b-jet flavor. Along with the charge of the W boson decay lepton, this information permits the reconstruction of the top quark's electric charge. Out of 45 reconstructed events with 2.4 {+-} 0.8 expected background events, 29 are reconstructed as tt with the standard model +2/3 charge, whereas 16 are reconstructed as t{bar t} with an exotic -4/3 charge. This is consistent with the standard model and excludes the exotic scenario at 95% confidence level. This is the strongest exclusion of the exotic charge scenario and the first to use soft leptons for this purpose.

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7 pages

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  • Journal Name: Submitted to Phys.Rev.Lett.; Journal Volume: 105; Journal Issue: 10

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  • Report No.: FERMILAB-PUB-10-207-E
  • Grant Number: AC02-07CH11359
  • DOI: 10.1103/PhysRevLett.105.101801 | External Link
  • Office of Scientific & Technical Information Report Number: 984006
  • Archival Resource Key: ark:/67531/metadc1014569

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  • June 1, 2010

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  • Oct. 14, 2017, 8:36 a.m.

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  • Oct. 19, 2017, 8:01 p.m.

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Aaltonen, T.; Phys., /Helsinki Inst. of; Adelman, J.; /Chicago U., EFI; Alvarez Gonzalez, B.; Phys., /Oviedo U. /Cantabria Inst. of et al. Exclusion of an Exotic Top Quark with -4/3 Electric Charge Using Soft Lepton Tagging, article, June 1, 2010; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1014569/: accessed March 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.