# Angular distribution coefficients of Z (W) boson produced in ${{e^+e^-}}$ collisions at ${{\sqrt{s}=240}}$ GeV

• At the designed circular electron-positron collider (CEPC), similar to the hadron collider, the angular distribution coefficients of the decay lepton pair from the produced Z(W) boson in $e^+ e^-$ collisions are predicted. Their dependence on cos$\theta_Z$ (cos$\theta_W$) are presented in four different polarization frames. Furthermore, the value of the angular distribution coefficients in different bins of cos$\theta_Z$ are presented in the C-S frame. In comparison with the case at the hadron collider, better accurate measurement for Z(W) is expected because there is less background, and W could be reconstructed from its leptonic decay channel. This works provides a method to precisely test the electroweak production mechanism or some effect induced from new physics in the future measurements at the CEPC.
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Yu-Dong Wang and Jian-Xiong Wang. Angular distribution coefficients of Z(W) boson produced in ${{e^+e^-}}$ collisions at ${{\sqrt{s}=240}}$ GeV[J]. Chinese Physics C. doi: 10.1088/1674-1137/43/4/043102
Yu-Dong Wang and Jian-Xiong Wang. Angular distribution coefficients of Z(W) boson produced in ${{e^+e^-}}$ collisions at ${{\sqrt{s}=240}}$ GeV[J]. Chinese Physics C.
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## Angular distribution coefficients of Z (W) boson produced in ${{e^+e^-}}$ collisions at ${{\sqrt{s}=240}}$ GeV

• Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
• School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China

Abstract: At the designed circular electron-positron collider (CEPC), similar to the hadron collider, the angular distribution coefficients of the decay lepton pair from the produced Z(W) boson in $e^+ e^-$ collisions are predicted. Their dependence on cos$\theta_Z$ (cos$\theta_W$) are presented in four different polarization frames. Furthermore, the value of the angular distribution coefficients in different bins of cos$\theta_Z$ are presented in the C-S frame. In comparison with the case at the hadron collider, better accurate measurement for Z(W) is expected because there is less background, and W could be reconstructed from its leptonic decay channel. This works provides a method to precisely test the electroweak production mechanism or some effect induced from new physics in the future measurements at the CEPC.

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