论文标题
在强子山子上的精密玻色子射流式非正式反相关
Precision boson-jet azimuthal decorrelation at hadron colliders
论文作者
论文摘要
载体和射流的方位角角度向QCD辐射敏感,可用于探测重离子碰撞中的夸克 - 胶原等离子体。通过使用无反冲的射流定义,从我们的理论计算中消除了对测量中软辐射污染的敏感性,非全球对数的并发症消除了。具体而言,我们将考虑$ p_t^n $重组方案以及$ n \ to \ infty $ limit,称为获奖者全方位方案。这些喷射定义还显着简化了基于轨道的测量的计算,这是由于其优质的角度分辨率而优选的。我们对软共线有效理论的分解进行了详细讨论,揭示了为什么横向动量$ \ vec q_t $比方位角角度更为复杂。我们表明,潜在的Glauber贡献并不会破坏我们的分解形式主义,至少在和包括$α_s^3 $的顺序上。使用重新归化组进行重新召开,并收集或计算所有必要的成分。我们以一项详细的现象学研究结束,发现高喷射$ p_t $的匹配校正是由于di-jets玻色子排放增强的。我们还将与毕田(Pythia)事件生成器进行比较,发现我们可观察到的对强扎和基础事件非常健壮。
The azimuthal angular decorrelation of a vector boson and jet is sensitive to QCD radiation, and can be used to probe the quark-gluon plasma in heavy-ion collisions. By using a recoil-free jet definition, the sensitivity to contamination from soft radiation on the measurement is reduced, and the complication of non-global logarithms is eliminated from our theoretical calculation. Specifically we will consider the $p_T^n$ recombination scheme, as well as the $n\to \infty$ limit, known as the winner-take-all scheme. These jet definitions also significantly simplify the calculation for a track-based measurement, which is preferred due to its superior angular resolution. We present a detailed discussion of the factorization in Soft-Collinear Effective Theory, revealing why the transverse momentum $\vec q_T$ is more complicated than the azimuthal angle. We show that potential glauber contributions do not spoil our factorization formalism, at least up to and including order $α_s^3$. The resummation is carried out using the renormalization group, and all necessary ingredients are collected or calculated. We conclude with a detailed phenomenological study, finding an enhanced matching correction for high jet $p_T$ due to the electroweak collinear enhancement of a boson emission off di-jets. We also compare with the Pythia event generator, finding that our observable is very robust to hadronization and the underlying event.