Speaker
Dr
Bin Yan
(Los Alamos National Laboratory)
Description
We propose to utilize the polarization information of the $Z$ bosons in $ZZ$ production, via the gluon-gluon fusion process $gg\to ZZ$, to probe the $Zt\bar{t}$ gauge coupling. The contribution of longitudinally polarized $Z$ bosons is sensitive to the axial-vector component ($a_t$) of the $Zt\bar{t}$ coupling. We demonstrate that the angular distribution of the charged lepton from $Z$ boson decays serves well for measuring the polarization of $Z$ bosons and the determination of $a_t$. We show that $ZZ$ production via the $gg\to ZZ$ process complement to $Zt\bar{t}$ and $tZj$ productions in measuring the $Zt\bar{t}$ coupling at hadron colliders.
Primary author
Dr
Bin Yan
(Los Alamos National Laboratory)
Co-authors
Prof.
Qing-Hong Cao
(Peking University)
Prof.
C.-P Yuan
(Michigan State University)
Dr
Ya Zhang
(Peking University)
