论文标题

Higgsino和Gaugino对在LHC上的生产与Annlo+NNLL精度

Higgsino and gaugino pair production at the LHC with aNNLO+NNLL precision

论文作者

Fiaschi, J., Klasen, M.

论文摘要

我们介绍了在LHC上以近隔至领先的对数(NNLL)精度在LHC处的Higgsino和Gaugino对产生的计算,与近似近代到接头订单(Annlo)QCD校正匹配。我们简要回顾了重新截止大阈值对数的形式主义,并强调了Annlo+NNLO精度所需的分析结果。发现我们的数值结果取决于产生的charginos和中性诺斯的质量和性质。像Sleptons一样,光Higgsinos的差分和总横截面主要是在小X和S通道中产生的,就我们以前的结果而言,再次中度增加了。然而,Gauginos的差分和总横截面不再增加,因为这样的事实是,像Squarks这样的Gauginos现在被Atlas和CMS限制为比大约1 TEV重,因此T-和U-Channels也起着重要作用。然后,在大X处进行探测的价夸克也引起了基本不同的横截面,以使带电的高速公路呈阳性。 Higgsino和Gaugino横截面均相对于重新归一化和分解量表的变化在Annlo+NNLL上进一步稳定。现在,我们还考虑了混合区域中的混合,并研究了总横截面对蹲下和gluino质量的依赖性以及在Sbottom部门特别控制混合的三线性耦合。

We present a calculation of higgsino and gaugino pair production at the LHC at next-to-next-to-leading logarithmic (NNLL) accuracy, matched to approximate next-to-next-to-leading order (aNNLO) QCD corrections. We briefly review the formalism for the resummation of large threshold logarithms and highlight the analytical results required at aNNLO+NNLO accuracy. Our numerical results are found to depend on the mass and nature of the produced charginos and neutralinos. The differential and total cross sections for light higgsinos, which like sleptons are produced mostly at small x and in the s-channel, are found to be again moderately increased with respect to our previous results. The differential and total cross sections for gauginos are, however, not increased any more due to the fact that gauginos, like squarks, are now constrained by ATLAS and CMS to be heavier than about 1 TeV, so that also t- and u-channels play an important role. The valence quarks probed at large x then also induce substantially different cross sections for positively and negatively charged gauginos. The higgsino and gaugino cross sections are both further stabilized at aNNLO+NNLL with respect to the variation of renormalization and factorization scales. We also now take mixing in the squark sector into account and study the dependence of the total cross sections on the squark and gluino masses as well as the trilinear coupling controlling the mixing in particular in the sbottom sector.

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