Neutral top-pion and $t\gamma(z)$ production at the HERA and THERA colliders

• Main Authors: Yue, Chongxing, Yu, Dongqi, Zong, Zhengjun
• Format: Journal Article
• Language: English
• Published: 07-03-2004
• Subjects: Physics - High Energy Physics - Phenomenology
• DOI: 10.48550/arxiv.hep-ph/0403074

Phys.Lett. B591 (2004) 220-224 In the context of top-color assisted technicolor ($TC2$) models, we calculate
the contributions of the neutral top-pion $ \pi_{t}^{0}$ to $t\gamma$ and $tz$
production via the processes $ ep\to \gamma c \to t\gamma $ and $ ep\to \gamma
c \to tz$ at the $HERA$ and $THERA$ colliders. Our results show that the cross
sections $\sigma_{t\gamma}(s)$ and $\sigma_{tz}(s)$ are very small at the
$HERA$ collider with $\sqrt{s}=320GeV $. However, in most of the parameter
space, $\sigma_{t\gamma}(s)$ or $\sigma_{tz}(s)$ is in the range of about
$0.1pb \sim 1 pb$ at the $THERA$ collider with $\sqrt{s}=1000GeV$.