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arXiv 1208.4018hep-phhep-ex
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关于LHC单产生共振的自旋和宇称

On the spin and parity of a single-produced resonance at the LHC

Sara Bolognesi, Yanyan Gao, Andrei V. Gritsan, Kirill Melnikov, Markus Schulze, Nhan V. Tran, Andrew Whitbeck

摘要:

在大型强子对撞机上新发现的玻色子的性质的实验测定是目前高能物理中最关键的任务。我们展示了如何自旋,宇称,更一般地说,张量结构的玻色子耦合可以通过研究的角度和质量分布的事件中,共振衰减到对规范玻色子,$ZZ, WW$,和$γγ$。一个完整的Monte Carlo模拟的过程$pp \to X \to VV \to 4f$进行和验证,通过比较它的衰减幅度$X \to VV \to 4f$的解析计算。我们的研究占所有的自旋相关性,包括一般耦合的自旋$J=0,1,2$共振标准模型粒子。我们还讨论了如何使用共振衰减产物的角分布和质量分布的最佳背景抑制。它表明,年底的8 TeV运行的大型强子对撞机,它可能是可能的分离极端假设的自旋和宇称的新玻色子的置信水平为99%或更好的广泛的模型。我们简要地讨论了测试方案的可行性,共振不是一个宇称本征态。

英文摘要:

The experimental determination of the properties of the newly discovered boson at the Large Hadron Collider is currently the most crucial task in high energy physics. We show how information about the spin, parity, and, more generally, the tensor structure of the boson couplings can be obtained by studying angular and mass distributions of events in which the resonance decays to pairs of gauge bosons, $ZZ, WW$, and $γγ$. A complete Monte Carlo simulation of the process $pp \to X \to VV \to 4f$ is performed and verified by comparing it to an analytic calculation of the decay amplitudes $X \to VV \to 4f$. Our studies account for all spin correlations and include general couplings of a spin $J=0,1,2$ resonance to Standard Model particles. We also discuss how to use angular and mass distributions of the resonance decay products for optimal background rejection. It is shown that by the end of the 8 TeV run of the LHC, it might be possible to separate extreme hypotheses of the spin and parity of the new boson with a confidence level of 99% or better for a wide range of models. We briefly discuss the feasibility of testing scenarios where the resonances is not a parity eigenstate.

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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