论文标题
分解及其在$ pp $碰撞中的Dijet单横向自旋不对称中的破裂
Factorization and its Breaking in Dijet Single Transverse Spin Asymmetries in $pp$ Collisions
论文作者
论文摘要
我们通过考虑以一环阶的软gluon辐射来研究质子 - 蛋白碰撞中二颗生产的单个横向自旋不对称的分解。我们表明，相关的横向动量依赖性（TMD）分解在领先的对数水平上是有效的。然而，在近代领导的岩石素（NLL）精度下，我们发现软gluon辐射在单个横向自旋截面中生成术语，这与未脱脂情况已知的横截面不同。结果，这些术语不能以分解公式中的自旋独立软因素来组织。我们基于受半含量深度非弹性散射数据约束的夸克·西弗斯（Quark Sesivers）的函数，对RHIC的单横旋型二耶特不对称呈现了领先的对数预测。我们希望我们的结果将有助于更好地理解NLL准确性及以后的TMD分解破坏效应。
We study factorization in single transverse spin asymmetries for dijet production in proton-proton collisions, by considering soft gluon radiation at one-loop order. We show that the associated transverse momentum dependent (TMD) factorization is valid at the leading logarithmic level. At next-to-leading-logarithmic (NLL) accuracy, however, we find that soft gluon radiation generates terms in the single transverse spin dependent cross section that differ from those known for the unpolarized case. As a consequence, these terms cannot be organized in terms of a spin independent soft factor in the factorization formula. We present leading logarithmic predictions for the single transverse spin dijet asymmetry for $pp$ collisions at RHIC, based on quark Sivers functions constrained by semi-inclusive deep inelastic scattering data. We hope that our results will contribute to a better understanding of TMD factorization breaking effects at NLL accuracy and beyond.
