arXiv 0812.11292008-12-19hep-ph

在LHC上荷电希格斯玻色子和顶夸克的关联产生中的CP破坏

CP violation in associated production of a charged Higgs boson and a top quark at the LHC

Ekaterina Christova, Helmut Eberl, Elena Ginina

备注：: Contributed talk, given at the workshop "Prospects for Charged Higgs Discovery at Colliders", September 16-19 2008, Uppsala, Sweden, 6 pages, 5 figures. To appear in the proceedings of the workshop, sign corrected in the box graph contribution

摘要：

我们研究了在大型强子对撞机（LHC）$pp \to tH^\pm +X$中产生带电希格斯玻色子和顶夸克的CP破坏效应。我们计算了在MSSM中$H^+$和$H^-$产生在次领先阶的总截面之间的CP破坏不对称性，并进行了详细的数值分析。在生产中，不对称性仅为20%的量级。壳层上带电的希格斯玻色子玻色子的产生和任何随后的衰变中的不对称性，很好地近似于产生中的不对称性和衰变中的不对称性之和。我们考虑$H^\pm $随后衰变为$tb$、$ν_ττ^\pm$和$Wh^0$。在随后的$H^\pm \to tb$衰变的情况下，来自产生和衰变的$W^\pm - H^\pm$自能贡献抵消。然而，剩余的影响，主要是由于CP违反盒图与胶子可以高达$\sim 13$ %。

英文摘要：

We study effects of CP violation in an associated production of a charged Higgs boson and a top quark at the LHC: $pp \to tH^\pm +X$. We calculate the CP violating asymmetry between the total cross section for $H^+$ and $H^-$ production at next-to-leading order in the MSSM, and perform a detailed numerical analysis. In the production only the asymmetry is of the order of 20%. The asymmetry in the production and any subsequent decay of an on-shell charged Higgs boson is to a good approximation the sum of the asymmetry in the production and the asymmetry in the decay. We consider subsequent decays of $H^\pm $ to $tb$, $ν_ττ^\pm$ and $Wh^0$. In the case of subsequent $H^\pm \to tb$ decay, the $W^\pm - H^\pm$ self energy contributions from the production and the decay cancel. However, the remaining effect, mainly due to CP violating box graphs with gluino can go up to $\sim 13$%.

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摘要：

英文摘要：

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