极化μ子DIS中纵向自旋向λ超子和反λ超子转移的测量

Probing transversity by measuring $Λ$ polarisation in SIDIS

Based on the observation of sizeable target-transverse-spin asymmetries in single-hadron and hadron-pair production in Semi-Inclusive measurements of Deep Inelastic Scattering (SIDIS), the chiral-odd transversity quark distribution functions $h_1^q$ are nowadays well established. Several possible channels to access these functions were originally proposed. One candidate is the measurement of the polarisation of $Λ$ hyperons produced in SIDIS off transversely polarised nucleons, where the transverse polarisation of the struck quark might be transferred to the final-state hyperon. In this articl…

半包含DIS的极化价夸克分布

The Polarised Valence Quark Distribution from semi-inclusive DIS

用欧洲核子研究中心的COMPASS实验测量了带相反电荷强子的半包含差不对称性A^{h^{+}-h^{-}}。这些数据是在2002-2004年间收集的，使用的是从一个大的极化^6LiD靶散射的160 GeV极化μ子束，覆盖范围为0.006 < x < 0.7和1 < Q^2 < 100（GeV/c）^2。在首阶QCD（LO）中，不对称性A_d^{h^{+}-h^{-}}测量了价夸克的极化，并给出了Δ u_v + Δ d_v的一阶矩的计算结果，其值为0.40 ± 0.07（stat.）+- 0.05（系统）在Q^2 = 10（GeV/c）^2时x的测量范围内。当与先前在相同数据上测量的g_1^d的一阶矩相结合时，这个结果在两个标准差的置信水平上支持轻夸克的非对称偏振Δ u-bar = -Δ d-bar，而不是通常假设的对称场景Δ u-bar = Δ d-bar = Δ s-bar = Δ s。

Transverse Spin Transfer of $Λ$ and $\overlineΛ$ Hyperons in Polarized $p$+$p$ Collisions at $\sqrt{s} = 200$ GeV at RHIC-STAR

The transverse spin transfer, $D_{TT}$, of $Λ$ and $\overlineΛ$ hyperons in $p$+$p$ collisions is expected to be sensitive to the $s$ and $\bar{s}$ quark transversity distributions in the proton and to the transversely polarized fragmentation functions. The STAR experiment has published the first measurement of the transverse spin transfer of $Λ$ and $\overlineΛ$ hyperons in transversely polarized $p$+$p$ collisions at $\sqrt{s}$ = 200 GeV within pseudo-rapidity $|η| < 1.2$ and for the transverse momenta up to 8 GeV/$c$ based on the data taken in 2012. In 2015, a data sample of $p$+$p$ collisi…

pbar p -> Lambdabar Lambda中低能极化和角分布的弦模型描述

String model description of polarisation and angular distributions in pbar p -> Lambdabar Lambda at low energies

在高能下，从包含性的pA -> Lambda X反应中观察到的Lambda超子的极化，以前已经在Lund弦模型中通过弦断裂强子化过程中的极化ss夸克对产生得到了很好的描述。这个模型在这里适用于独家pbar p -> Lambdabar Lambda反应在低能量和可用的数据集相比，入射束动量为1.835 GeV/c。这需要扩展双夸克散射模型，使其包含三个部分：接近阈值的各向同性部分、旁观者部分和前向散射部分，如高能时的pA -> λ X。然后再现所观察到的角分布，对于上面的动量传递，|t'|= 0.2 GeV^2，也得到了与测量的极化一致。

Hyperon physics at BESIII

Using the largest $J/ψ$ and $ψ(3686)$ data samples collected at the BESIII experiment, the hyperon anti-hyperon pairs are generated in their quantum entangle system. The polarization of hyperon has been observed, which makes it possible to measure the decay parameters of hyperon and anti-hyperon precisely. The CP conservation observables have been estimated which is important to test the Standard Model. In the meanwhile, the branching fractions and angular distributions related to hyperon pair production have been measured.

使用 SHERPA 生成矢量玻色子产生的极化截面

Polarised cross sections for vector boson production with SHERPA

扩展 SHERPA 蒙特卡洛生成器以模拟矢量玻色子产生的极化截面，首次实现了包含极化信息和高阶 QCD 效应的强子层级完整模拟计算。

LHC中极化同号WW散射的NLO EW和QCD修正

NLO EW and QCD corrections to polarised same-sign WW scattering at the LHC

首次在LHC同号WW散射完全轻子衰变通道中包含极化建模并计算至NLO EW+QCD精度，通过极点展开等方法分析极化态区分的微分可观测量，为Run-3数据分析铺路。

极化部分子分布函数与质子自旋

Polarised parton distribution functions and proton spin

本文基于全阶精确的有效电荷演化方案和强子尺度价夸克极化分布函数 Ansätze，预测了质子全部极化部分子分布函数，并给出极化胶子积分和味单态轴矢荷的具体数值。

夸克碎裂过程中超子的味和自旋结构

The Flavor and Spin Structure of Hyperons from Quark Fragmentation

基于SU（6）夸克-旁观者-双夸克模型中八重态重子的夸克分布预测和基于微扰QCD的计数定则分析，我们系统地研究了大$z$下八重态重子的强子纵向极化，包括$e^+e^-$ -湮灭过程中的夸克碎裂、极化轻子深度非弹性散射（DIS）过程和中微子（反中微子）DIS过程.我们表明，$e^+e^-$ -湮灭和极化带电轻子DIS过程能够区分超子极化的两种不同的预测。我们还发现中微子/反中微子DIS过程是研究超子价含量和反夸克到超子（夸克到反超子）碎裂的理想过程，这可能与超子的价含量有关.