Single Leptoquark Production at $e^+e^-$ and $γγ$ Colliders

Details Single Leptoquark Production at $e^+e^-$ and $γγ$ Colliders Single Leptoquark Production at $e^+e^-$ and $γγ$ Colliders

1993-07-22

arxiv.org/abs/hep-ph/9307324v2

Phys.Rev. D49 (1994) 3140-3147

Physics

High Energy Physics

High Energy Physics - Phenomenology

plain TeX, 14 pages, 6 figures (not included but available on request), some minor changes to the text, one reference added, f

Scientific paper

10.1103/PhysRevD.49.3140

We consider single production of leptoquarks (LQ's) at $e^+e^-$ and $\gamma\gamma$ colliders, for two values of the centre-of-mass energy, $\sqrt{s}=500$ GeV and 1 TeV. We find that LQ's which couple within the first generation are observable for LQ masses almost up to the kinematic limit, both at $e^+e^-$ and $\gamma\gamma$ colliders, for the LQ coupling strength equal to $\alpha_{em}$. The cross sections for single production of $2^{nd}$- and $3^{rd}$-generation LQ's at $e^+e^-$ colliders are too small to be observable. In $\gamma\gamma$ collisions, on the other hand, $2^{nd}$-generation LQ's with masses much larger than $\sqrt{s}/2$ can be detected. However, $3^{rd}$-generation LQ's can be seen at $\gamma\gamma$ colliders only for masses at most $\sim\sqrt{s}/2$, making their observation more probable via the pair production mechanism.

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