论文标题
LHC和风味异常的标量leptoquarks：NLO-QCD配对模式的比较
Scalar leptoquarks at the LHC and flavour anomalies: a comparison of pair-production modes at NLO-QCD
论文作者
论文摘要
我们在LHC上分析了标量Leptokark对的生产，其中包括$ t $ channel Lepton Exchange捐款，直到QCD的近代领先顺序（NLO）。 In particular, we calculate NLO-QCD predictions for off-diagonal production channels, {\it i.e.}\ channels that involve two different leptoquark eigenstates and are driven solely by diagrams involving Standard Model leptons in the $t$-channel at leading order, as opposed to diagonal channels where a pair of the same leptoquark eigenstate is produced.我们发现两个通道的可靠理论预测都需要NLO准确性。非对角线模式的相对重要性在很大程度上取决于考虑的情况。在涉及$ r_2 $和$ s_3 $ leptoquarks的通用型号中，在Valence Quarks发起的Yukawa耦合的巨大值中，可以比对角线产量高的数量级。但是，我们还发现，在现象学上可行的情景中，解决风味异常的异常生产通常可以忽略不计，但少数几个例外10 \％-30 \％的总率，取决于质子中魅力密度的处理。
We analyse scalar leptoquark pair production at the LHC with predictions including $t$-channel lepton exchange contributions up to next-to-leading order (NLO) in QCD. In particular, we calculate NLO-QCD predictions for off-diagonal production channels, {\it i.e.}\ channels that involve two different leptoquark eigenstates and are driven solely by diagrams involving Standard Model leptons in the $t$-channel at leading order, as opposed to diagonal channels where a pair of the same leptoquark eigenstate is produced. We find that reliable theoretical predictions for both channels require NLO accuracy. The relative importance of the off-diagonal modes depends strongly on the considered scenario. In a generic model involving $R_2$ and $S_3$ leptoquarks, at large values of the Yukawa couplings off-diagonal contributions initiated by valence quarks can be up to an order of magnitude higher than the diagonal production. However, we also find that in phenomenologically viable scenarios addressing the flavour anomalies off-diagonal production is generally negligible, with a few exceptions of 10\%--30\% of the total rate depending on the treatment of the charm density in the proton.
