Gaugino-pair production in polarized and unpolarized hadron collisions
Gaugino-pair production in polarized and unpolarized hadron collisions
复制标题
极化和非极化强子碰撞中高吉诺对的产生
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
M. Klasen
中科院分区：
文献类型：
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作者：
Jonathan Debove;B. Fuks;M. Klasen
我们对极化和非极化强子碰撞中的伽吉诺对的产生进行了探索性的研究，重点讨论了在一般的最小超对称标准模型中光束的极化与伽吉诺/希格西诺混合的关联。用广义电荷的形式解析地计算了由中性和带电的弱电流和象素交换引起的螺旋度相关的截面，广义电荷的定义类似于电荷对、中性电子-电荷相关的电荷和中性电子对的产生。我们的结果证实并推广了以前关于可忽略的Yukawa耦合和非混合夸克的结果。假定最轻的带电粒子质量已知，我们数值地表明，在现有的极化$pp$对撞机RHIC上以及在Tevatron或LHC可能的极化升级处测量纵向单自旋不对称性，将允许确定Charginos和中性粒子的Gagino/Higgsino部分。由因子化尺度和夸克质量变化引起的理论不确定度和对最轻荷基诺质量的预期实验误差通常比由极化部分子密度引起的理论不确定度小，因此有关后者的更多信息将大大改善分析。
We present an exploratory study of gaugino-pair production in polarized and unpolarized hadron collisions, focusing on the correlation of beam polarization and gaugino/Higgsino mixing in the general minimal supersymmetric standard model. Helicity-dependent cross sections induced by neutral and charged electroweak currents and squark exchanges are computed analytically in terms of generalized charges, defined similarly for chargino-pair, neutralino-chargino associated, and neutralino-pair production. Our results confirm and extend those obtained previously for negligible Yukawa couplings and nonmixing squarks. Assuming that the lightest chargino mass is known, we show numerically that measurements of the longitudinal single-spin asymmetry at the existing polarized $pp$ collider RHIC and at possible polarization upgrades of the Tevatron or the LHC would allow for a determination of the gaugino/Higgsino fractions of charginos and neutralinos. The theoretical uncertainty coming from factorization scale and squark mass variations and the expected experimental error on the lightest chargino mass is generally smaller than the one induced by the polarized parton densities, so that more information on the latter would considerably improve on the analysis.