Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2010-05-25
Physics
High Energy Physics
High Energy Physics - Experiment
12 pages, 10 figures, Proceedings of the ILC physics working group meetings, KEK
Scientific paper
We have studied the measurement accuracy of the forward-backward asymmetry of the $e^+e^- \rightarrow t\bar{t}$ process in the 6-jet mode at $\sqrt{s} = 500$ GeV with the ILD detector. In the analysis the vertex charges of b-jets were used to distinguish t from $\bar{t}$ in each event. The distribution of the cosine of the reconstructed polar angle of so identified t or $\bar{t}$ showed a clear forward-backward asymmetry. After the correction for charge misidentification the forward-backward asymmetry was determined to be $A^t_{FB} = 0.334 \pm 0.0079$ for 500 fb$^{-1}$ with the beam polarization combination of $P(e^+, e^-) = (+30\%, -80\%)$, demonstrating a very good statistical accuracy ($\sim 2\%$) even in the 6-jet mode.
Fujii Keisuke
Ikematsu Katsumasa
Miyamoto Akiya
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