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Supersymmetric QCD and CP-violation effects in $t ar t Z^0$ production at the LHC | | Liu Ning
; Guo Lei
; Ma Wen-Gan
; Zhang Ren-You
; Han Liang
; | | Date: |
28 Jun 2010 | | Abstract: | We investigate the NLO QCD and the CP-violation effects in $tar{t}Z^0$
production at the Large Hadron Collider(LHC) in the minimal supersymmetric
standard model(MSSM). Our calculation shows that the total NLO QCD correction
in the framework of the CP-conserving MSSM significantly improves the scale
uncertainty at the leading order, and the contribution from the pure
supersymmetric QCD (pSQCD) correction can exceed $-8\%$ with the restrictions
of $90~GeV < p_T^t < 120~GeV$ and $120~GeV < p_T^Z < 150~GeV$, where $p_T^t$
and $p_T^Z$ are the transverse momenta of the top-quark and $Z^0$ gauge boson,
respectively. Our numerical results demonstrate that the pure SUSY QCD
correction generally suppresses the total SM-like QCD correction in the
CP-conserving MSSM, and tends to be a constant when either $ ilde{t}_1$ or
$ ilde{g}$ is heavy enough. We find also that the CP-odd asymmetry ${cal
A}_{Phi}$ can reach $2.17 imes 10^{-3}$, if the CP-phase angle really exists
in the coupling of gluino-stop-top. | | Source: | arXiv, 1006.5249 | | Services: | Forum | Review | PDF | Favorites | |
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