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arXiv 0810.0020hep-ph
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极化质子碰撞中弱玻色子强子衰变的纵向宇称破坏不对称性

Longitudinal parity-violating asymmetry in hadronic decays of weak bosons in polarized proton collisions

Edmond L. Berger, Pavel M. Nadolsky

摘要:

我们研究了在布鲁克海文相对论重离子对撞机(RHIC)质子-质子碰撞中产生喷流对的宇称破坏自旋不对称性的可能测量,目标是约束纵向极化夸克和反夸克分布函数。在大量弱W玻色子共振附近可以观察到可测量的不对称性,其中宇称破坏信号出现在宇称守恒背景之上,并且通过强和电弱产生振幅的干扰而增强。我们讨论了这种测量的潜力,也许是第一次有机会来测量宇称违反质子碰撞在RHIC的不对称性。证明了这种测量对下型反夸克极化的敏感性。

英文摘要:

We investigate the possible measurement of parity-violating spin asymmetries in jet pair production in proton-proton collisions at the Brookhaven Relativistic Heavy Ion Collider (RHIC), with the goal to constrain longitudinally polarized quark and antiquark distribution functions. A measurable asymmetry could be observed in the vicinity of the massive weak W boson resonance, where the parity-violating signal appears above the parity-conserving background and is enhanced by interference of the strong and electroweak production amplitudes. We discuss the potential for such measurements, perhaps the first opportunity to measure a parity-violating asymmetry in proton-proton collisions at RHIC. Sensitivity of this measurement to the polarization of down-type antiquarks is demonstrated.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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