We present the measurement of the relative fraction of the subprocess where the initial states are gluon-gluon pairs or quark-antiquark pairs in top-antitop production at 1.96 TeV protonantiproton collisions. We identify and reconstruct the signal using events which include two high-momentum leptons, and we distinguish the two subproceses by utilizing the correlated spin states of top and antitop quarks. The analysis is based on 2.0 fb-1 of data collected with the Collider Detector at Fermilab (CDF) at the Fermilab Tevatron between March 2002 and May 2007. We find the fraction of the gluon-gluon fusion subprocess to be Fgg=0.53+0.36-0.38. That is in agreement with the next-to-leading order calculations of Fgg=0.15 ± 0.05.
|出版ステータス||Published - 2009|
|イベント||44th Rencontres de Moriond on Electroweak Interactions and Unified Theories, EW 2009 - La Thuile, Italy|
継続期間: 2009 3 7 → 2009 3 14
|Conference||44th Rencontres de Moriond on Electroweak Interactions and Unified Theories, EW 2009|
|Period||09/3/7 → 09/3/14|
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