Direct Top-Quark Width Measurement at CDF
We present a measurement of the top-quark width in the lepton+jets decay channel of tt̅ events produced in pp̅ collisions at Fermilab’s Tevatron collider and collected by the CDF II detector. From a data sample corresponding to 4.3 fb-1 [fb superscript -1] of integrated luminosity, we identify 756...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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American Physical Society
2011
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| Online Access: | http://hdl.handle.net/1721.1/62563 https://orcid.org/0000-0002-6047-4211 |
| _version_ | 1826205064576892928 |
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| author | Gomez-Ceballos, Guillelmo Goncharov, Maxim Makhoul, Khaldoun Paus, Christoph M. E. Bauer, Gerry P |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Gomez-Ceballos, Guillelmo Goncharov, Maxim Makhoul, Khaldoun Paus, Christoph M. E. Bauer, Gerry P |
| author_sort | Gomez-Ceballos, Guillelmo |
| collection | MIT |
| description | We present a measurement of the top-quark width in the lepton+jets decay channel of tt̅ events produced in pp̅ collisions at Fermilab’s Tevatron collider and collected by the CDF II detector. From a data sample corresponding to 4.3 fb-1 [fb superscript -1] of integrated luminosity, we identify 756 candidate events. The top-quark mass and the mass of the hadronically decaying W boson that comes from the top-quark decay are reconstructed for each event and compared with templates of different top-quark widths (Γt) [gamma subscript t] and deviations from nominal jet energy scale (ΔJES)[delta subscript JES] to perform a simultaneous fit for both parameters, where ΔJES [delta subscript JES] is used for the in situ calibration of the jet energy scale. By applying a Feldman-Cousins approach, we establish an upper limit at 95% confidence level (CL) of Γt<7.6 GeV [gamma subscript t<7.6 GeV] and a two-sided 68% CL interval of 0.3 GeV<Γt<4.4 GeV [GeV<gamma subscript t<4.4 GeV]] for a top-quark mass of 172.5 GeV/c2 [GeV / c superscript 2], which are consistent with the standard model prediction. |
| first_indexed | 2024-09-23T13:06:11Z |
| format | Article |
| id | mit-1721.1/62563 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:06:11Z |
| publishDate | 2011 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/625632023-02-26T07:56:09Z Direct Top-Quark Width Measurement at CDF Gomez-Ceballos, Guillelmo Goncharov, Maxim Makhoul, Khaldoun Paus, Christoph M. E. Bauer, Gerry P Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Paus, Christoph M. E. Bauer, Gerry P. Gomez-Ceballos, Guillelmo Goncharov, Maxim Makhoul, Khaldoun Paus, Christoph M. E. We present a measurement of the top-quark width in the lepton+jets decay channel of tt̅ events produced in pp̅ collisions at Fermilab’s Tevatron collider and collected by the CDF II detector. From a data sample corresponding to 4.3 fb-1 [fb superscript -1] of integrated luminosity, we identify 756 candidate events. The top-quark mass and the mass of the hadronically decaying W boson that comes from the top-quark decay are reconstructed for each event and compared with templates of different top-quark widths (Γt) [gamma subscript t] and deviations from nominal jet energy scale (ΔJES)[delta subscript JES] to perform a simultaneous fit for both parameters, where ΔJES [delta subscript JES] is used for the in situ calibration of the jet energy scale. By applying a Feldman-Cousins approach, we establish an upper limit at 95% confidence level (CL) of Γt<7.6 GeV [gamma subscript t<7.6 GeV] and a two-sided 68% CL interval of 0.3 GeV<Γt<4.4 GeV [GeV<gamma subscript t<4.4 GeV]] for a top-quark mass of 172.5 GeV/c2 [GeV / c superscript 2], which are consistent with the standard model prediction. United States. Dept. of Energy National Science Foundation (U.S.) Alfred P. Sloan Foundation 2011-04-28T20:33:39Z 2011-04-28T20:33:39Z 2010-12 2010-08 Article http://purl.org/eprint/type/JournalArticle 0031-9007 http://hdl.handle.net/1721.1/62563 Aaltonen, T. et al. “Direct Top-Quark Width Measurement at CDF.” Physical Review Letters 105.23 (2010) : n. pag. © 2010 The American Physical Society https://orcid.org/0000-0002-6047-4211 en_US http://dx.doi.org/10.1103/PhysRevLett.105.232003 Physical review letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Gomez-Ceballos, Guillelmo Goncharov, Maxim Makhoul, Khaldoun Paus, Christoph M. E. Bauer, Gerry P Direct Top-Quark Width Measurement at CDF |
| title | Direct Top-Quark Width Measurement at CDF |
| title_full | Direct Top-Quark Width Measurement at CDF |
| title_fullStr | Direct Top-Quark Width Measurement at CDF |
| title_full_unstemmed | Direct Top-Quark Width Measurement at CDF |
| title_short | Direct Top-Quark Width Measurement at CDF |
| title_sort | direct top quark width measurement at cdf |
| url | http://hdl.handle.net/1721.1/62563 https://orcid.org/0000-0002-6047-4211 |
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