将中微子-核碰撞中的双缪子产生推进到NNLO精度
Taking dimuon production in DIS to NNLO precision
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中文总结 AI 辅助
该研究将中微子-核双缪子产生截面直接计算至NNLO精度，采用SIDIS系数与数据拟合衰变函数，发现大x处标度不确定性显著降低，小x处截面减小，有助于缓解奇异夸克分布相关数据张力。
中文摘要 AI 辅助
我们提出了中微子-核碰撞中双缪子产生的更新计算——这是对相对知之甚少的奇异夸克分布的一个重要约束——在次次领头阶（NNLO）精度上。与文献中通常采用的方法（即计算包含性粲产生并将截面乘以修正因子）相比，我们改为直接使用半包含深度非弹性散射（SIDIS）和由数据拟合的衰变函数来计算双缪子产生截面。虽然包含性粲产生此前已计算到NNLO，我们利用最近计算出的NNLO SIDIS系数来计算整个双缪子产生过程中微扰部分至NNLO。我们发现，在较大动量分数$x$处，标度不确定性显著减小，此时NNLO修正倾向于增大截面。在较小$x$处，我们发现截面减小，这种行为可能与奇异海夸克的抑制有关，并可能最终缓解双缪子中微子数据与LHC重规范玻色子数据之间观察到的张力。
英文摘要
We present an updated calculation of dimuon production in neutrino-nucleus collisions - an important constraint of the relatively poorly-known strange-quark distribution - at next-to-next-to-leading (NNLO) order. Compared to the approach usually used in the literature, where one computes inclusive charm production and multiplies the cross section by corrective factors, we instead compute the dimuon production cross section directly using semi-inclusive deep inelastic scattering (SIDIS) and a data-fitted decay function. While inclusive charm production has previously been computed to NNLO, we are using the recently-computed NNLO SIDIS coefficients to calculate the perturbative parts of the entire dimuon production process at NNLO. We find a notable reduction of scale uncertainties at larger momentum-fraction $x$, where the NNLO corrections tend to increase the cross section. At smaller $x$, we find a decrease in the cross section, a behaviour which can be linked to the suppression of the strange sea and which may eventually alleviate the tension observed between dimuon neutrino and LHC heavy-gauge boson data.
