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arXiv 1104.3645hep-phhep-ex
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在横偏振态下分离e+e- \to γZ中CP破坏的γZZ耦合

Isolating CP-violating γZZ coupling in e+e- \to γZ with transverse beam polarizations

B. Ananthanarayan, Sumit K. Garg, Monalisa Patra, Saurabh D. Rindani

摘要:

我们重新审视过程$e^+e^- \to γZ$在ILC与横向光束偏振的异常CP违反$γZ Z$耦合$λ_1$和$γγZ$耦合$λ_2$的存在。我们指出,如果最终状态的自旋被解决,则可以对异常耦合{ \rm Re} $λ_1$进行指纹识别,在ILC处可实现的{ \rm Re} $λ_1$的90%置信水平极限,当$Z$的螺旋度小于1000 μ m时,500 GeV或800 GeV的质量能量与实际的初始束偏振和积分光度是$10^{-2}$的几倍当使用$γ$的螺旋度时,则使用$γ$,而当使用$10^{-3}$时,则使用$10^{-3}$。由此产生的修正在二次阶的横截面及其对这些限制的影响也进行了评估,并被证明是小的。在国际法委员会的这种极化方案的好处进行了比较和对比的过程。我们还讨论了可能的方法,通过这种方法可以隔离事件与一个明确的螺旋的最终状态粒子。

英文摘要:

We revisit the process $e^+e^- \to γZ$ at the ILC with transverse beam polarization in the presence of anomalous CP-violating $γZ Z$ coupling $λ_1$ and $γγZ$ coupling $λ_2$. We point out that if the final-state spins are resolved, then it becomes possible to fingerprint the anomalous coupling {\rm Re}$λ_1$.90% confidence level limit on {\rm Re}$λ_1$ achievable at ILC with center-of-mass energy of 500 GeV or 800 GeV with realistic initial beam polarization and integrated luminosity is of the order of few times of $10^{-2}$ when the helicity of $Z$ is used and $10^{-3}$ when the helicity of $γ$ is used. The resulting corrections at quadratic order to the cross section and its influence on these limits are also evaluated and are shown to be small. The benefits of such polarization programmes at the ILC are compared and contrasted for the process at hand. We also discuss possible methods by which one can isolate events with a definite helicity for one of the final-state particles.

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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