论文标题
将夸克旋转效果添加到毕曲霉弦碎片
Adding quark spin effects to PYTHIA string fragmentation
论文作者
论文摘要
最近，在Pythia 8事件发生器中包含了强夸旋转效应，以通过外部Stringspinner套件模拟了极化核子目标的深度非弹性散射（DIS）过程。可以使用字符串+$ {}^3p_0 $偏振夸克碎片的模型和横向PDF的参数化模型来模拟自旋效应，以模拟伪尺度介体。我们在这里提出了Stringspinner的重大发展，其中包括在极化的Pythia 8弦乐碎片及其两极分化的衰减中生产媒介膜的生产。该软件包经过验证，并用于模拟半包含的dis（SIDIS）中的横向自旋不对称。将最终状态介子的Collins和Dihadron不对称的仿真结果与在SIDIS OFF横向极化质子中测得的不对称性进行了比较。还显示了柯林斯对sidis中产生的$ρ$介子的collins不对称的预测。
Quark spin effects in hadronization have been recently included in the PYTHIA 8 event generator for the simulation of the deep inelastic scattering (DIS) process off a polarized nucleon target via the external StringSpinner package. The spin effects can be simulated for the production of pseudoscalar mesons using the string+${}^3P_0$ model of polarized quark fragmentation and parametrizations of the transversity PDFs. We present here a major development of StringSpinner which includes the production of vector mesons in the polarized PYTHIA 8 string fragmentation as well as their polarized decays. The package is validated and used to simulate the transverse-spin asymmetries in semi-inclusive DIS (SIDIS). The simulation results on the Collins and dihadron asymmetries for the final state mesons are compared with the asymmetries measured in SIDIS off transversely polarized protons. Also shown are the predictions for the Collins asymmetries for $ρ$ mesons produced in SIDIS off transversely polarized protons.
