论文标题
在峰地区提高顶级夸克
Boosted Top Quarks in the Peak Region with N$^3$LL Resummation
论文作者
论文摘要
我们为在$ e^+e^ - $相撞的峰值碰撞中产生的2种差异分布的结果介绍了QCD大型质量重新点的碰撞，该QCD大量重新点召开了近代的next到next to-next to-next to dooging Googarithmic（n $^3 $ ll）的订单和固定级校正，并在固定级别上进行了序列校正，以填充元素（nexto）electerions nectriper（nexto）extription-nect-nect-nect-nect-nect-nect-nexternext（软共线的有效理论，并提高了重夸克有效理论。电力和有限宽度效果在领先顺序中包括在内。我们研究了有或没有软间隙减法的POL和MSR质量方案中横截面的扰动收敛性。我们发现极质量和软功能肾结杆之间存在部分取消。但是，当实施有关顶部质量和软函数的肾上腺统一减法时，扰动的不确定性在系统上较小，并且观察到峰位置的稳定性的提高。我们发现，最高的MSR质量可以通过扰动不确定性确定，远低于$ 100 $ \，MEV，从2种杰特分布的峰位置。该结果对蒙特卡洛顶夸克质量校准具有重要的应用。
We present results for the 2-jettiness differential distribution for boosted top quark pairs produced in $e^+e^-$ collisions in the peak region accounting for QCD large-logarithm resummation at next-to-next-to-next-to-leading logarithmic (N$^3$LL) order and fixed-order corrections to matrix elements at next-to-next-to-leading order (NNLO) calculated in the framework of soft-collinear effective theory and boosted heavy quark effective theory. Electroweak and finite-width effects are included at leading order. We study the perturbative convergence of the cross section in the pole and MSR mass schemes, with and without soft gap subtractions. We find that there is a partial cancellation between the pole mass and soft function renormalons. When renormalon subtractions concerning the top mass and the soft function are implemented, the perturbative uncertainties are, however, systematically smaller and an improvement in the stability of the peak position is observed. We find that the top MSR mass may be determined with perturbative uncertainties well below $100$\,MeV from the peak position of the 2-jettiness distribution. This result has important applications for Monte Carlo top quark mass calibrations.
