具有aNNLO + NNLL精度的Slepton对生产
Slepton pair production with aNNLO+NNLL precision
摘要：
我们提出了一个计算的slepton对生产在大型强子对撞机在下一个到下一个到领先的对数（NNLL）的准确性，匹配到近似下一个到下一个到领先的顺序（aNNLO）QCD修正。我们收集了相关的解析公式，讨论了热力学增强结果和固定阶结果的匹配，描述了部分子密度和强子截面在Mellin空间和Mellin空间之间的转换。数值上，我们发现一个温和的增加不变质量分布和总截面相对于我们以前的结果在下一个领先的对数（NLL）的精度匹配下一个领先的顺序（NLO），更重要的是进一步显着减少的因子分解和重整化规模的依赖，稳定我们的预测permil水平。对其他超对称参数如夸克和胶子质量以及只在NLO处进入的sbottom混合的依赖性很弱，即不到2%，正如预期的那样。
英文摘要：
We present a calculation of slepton 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 collect the relevant analytical formulae, discuss the matching of logarithmically enhanced and fixed-order results and describe the transformation of parton densities and hadronic cross sections to and from Mellin space. Numerically, we find a moderate increase of invariant-mass distributions and total cross sections with respect to our previous results at next-to-leading logarithmic (NLL) accuracy matched to next-to-leading order (NLO), and more importantly a further significant reduction of the factorisation and renormalisation scale dependence that stabilises our predictions to the permil level. The dependence on other supersymmetric parameters like squark and gluino masses and sbottom mixing that enter only at NLO is found to be weak, i.e.\ less than two percent, as expected.
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