Measurement of the top quark forward-backward production asymmetry and its dependence on event kinematic properties
We present new measurements of the inclusive forward-backward ttbar production asymmetry, AFB, and its dependence on several properties of the ttbar system. The measurements are performed with the full Tevatron data set recorded with the CDF II detector during ppbar collisions at sqrt(s) = 1.96 TeV,...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2012
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| _version_ | 1797078240509034496 |
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| author | Collaboration, CDF Aaltonen, T Amerio, S Amidei, D Anastassov, A Annovi, A Antos, J Apollinari, G Appel, J Arisawa, T Artikov, A Asaadi, J Ashmanskas, W Auerbach, B Aurisano, A Azfar, F Badgett, W Bae, T Barbaro-Galtieri, A Barnes, V Barnett, B Barria, P Bartos, P Bauce, M Bedeschi, F |
| author_facet | Collaboration, CDF Aaltonen, T Amerio, S Amidei, D Anastassov, A Annovi, A Antos, J Apollinari, G Appel, J Arisawa, T Artikov, A Asaadi, J Ashmanskas, W Auerbach, B Aurisano, A Azfar, F Badgett, W Bae, T Barbaro-Galtieri, A Barnes, V Barnett, B Barria, P Bartos, P Bauce, M Bedeschi, F |
| author_sort | Collaboration, CDF |
| collection | OXFORD |
| description | We present new measurements of the inclusive forward-backward ttbar production asymmetry, AFB, and its dependence on several properties of the ttbar system. The measurements are performed with the full Tevatron data set recorded with the CDF II detector during ppbar collisions at sqrt(s) = 1.96 TeV, corresponding to an integrated luminosity of 9.4 fb^(-1). We measure the asymmetry using the rapidity difference Delta-y=y_(t)-y_(tbar). Parton-level results are derived, yielding an inclusive asymmetry of 0.164+/-0.047 (stat + syst). We observe a linear dependence of AFB on the top-quark pair mass M(ttbar) and the rapidity difference |Delta-y| at detector and parton levels. Assuming the standard model, the probabilities to observe the measured values or larger for the detector-level dependencies are 7.4*10^(-3) and 2.2*10^(-3) for M(ttbar) and |Delta-y| respectively. Lastly, we study the dependence of the asymmetry on the transverse momentum of the ttbar system at the detector level. These results are consistent with previous lower-precision measurements and provide additional quantification of the functional dependencies of the asymmetry. |
| first_indexed | 2024-03-07T00:29:15Z |
| format | Journal article |
| id | oxford-uuid:7f349cbd-a664-4d91-b49b-2124f55a5614 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T00:29:15Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | oxford-uuid:7f349cbd-a664-4d91-b49b-2124f55a56142022-03-26T21:15:25ZMeasurement of the top quark forward-backward production asymmetry and its dependence on event kinematic propertiesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:7f349cbd-a664-4d91-b49b-2124f55a5614EnglishSymplectic Elements at Oxford2012Collaboration, CDFAaltonen, TAmerio, SAmidei, DAnastassov, AAnnovi, AAntos, JApollinari, GAppel, JArisawa, TArtikov, AAsaadi, JAshmanskas, WAuerbach, BAurisano, AAzfar, FBadgett, WBae, TBarbaro-Galtieri, ABarnes, VBarnett, BBarria, PBartos, PBauce, MBedeschi, FWe present new measurements of the inclusive forward-backward ttbar production asymmetry, AFB, and its dependence on several properties of the ttbar system. The measurements are performed with the full Tevatron data set recorded with the CDF II detector during ppbar collisions at sqrt(s) = 1.96 TeV, corresponding to an integrated luminosity of 9.4 fb^(-1). We measure the asymmetry using the rapidity difference Delta-y=y_(t)-y_(tbar). Parton-level results are derived, yielding an inclusive asymmetry of 0.164+/-0.047 (stat + syst). We observe a linear dependence of AFB on the top-quark pair mass M(ttbar) and the rapidity difference |Delta-y| at detector and parton levels. Assuming the standard model, the probabilities to observe the measured values or larger for the detector-level dependencies are 7.4*10^(-3) and 2.2*10^(-3) for M(ttbar) and |Delta-y| respectively. Lastly, we study the dependence of the asymmetry on the transverse momentum of the ttbar system at the detector level. These results are consistent with previous lower-precision measurements and provide additional quantification of the functional dependencies of the asymmetry. |
| spellingShingle | Collaboration, CDF Aaltonen, T Amerio, S Amidei, D Anastassov, A Annovi, A Antos, J Apollinari, G Appel, J Arisawa, T Artikov, A Asaadi, J Ashmanskas, W Auerbach, B Aurisano, A Azfar, F Badgett, W Bae, T Barbaro-Galtieri, A Barnes, V Barnett, B Barria, P Bartos, P Bauce, M Bedeschi, F Measurement of the top quark forward-backward production asymmetry and its dependence on event kinematic properties |
| title | Measurement of the top quark forward-backward production asymmetry and
its dependence on event kinematic properties |
| title_full | Measurement of the top quark forward-backward production asymmetry and
its dependence on event kinematic properties |
| title_fullStr | Measurement of the top quark forward-backward production asymmetry and
its dependence on event kinematic properties |
| title_full_unstemmed | Measurement of the top quark forward-backward production asymmetry and
its dependence on event kinematic properties |
| title_short | Measurement of the top quark forward-backward production asymmetry and
its dependence on event kinematic properties |
| title_sort | measurement of the top quark forward backward production asymmetry and its dependence on event kinematic properties |
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