Spin before mass at the LHC

Spin before mass at the LHC
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大型强子对撞机的质量之前旋转

DOI:
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发表时间:
2011
期刊:
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通讯作者:
Tom Melia
Tom Melia
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文献类型:
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作者:
Tom Melia

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在欧洲核子研究中心的最初发现阶段,如果不知道新粒子的质量,我们能对它们的自旋说些什么呢?我们考虑这个问题在一个质量测量的拓扑是特别困难的,美元页o Yoverline Y o lXoverline l X ${}上划线,并引入两个新的变量cosθV和美元mathcal{一}_{{你}}^ V $,我们证明都是独立于X变量cosθV的质量接近极地生产角度Y,我们发现它具有更大的统计力量在决定比以前这个粒子的自旋,相关变量,cosθ[1]。$ mathcal{A}_{{ll}}^V $是一种不对称,它可以提供关于自旋一半y的耦合的信息。因为这些变量可以从一开始就使用,而不需要知道新粒子的质量,我们在这里发现有可能逆转通常的“自旋前质量”确定时间轴。
A bstractWhat can be said about the spin of new particles without knowing their mass during an initial discovery phase at CERN? We consider this question in a topology where mass measurement is particularly difficult, $ pp o Yoverline Y o lXoverline l { }overline X $, and introduce two new variables cos θV and $ mathcal{A}_{{ll}}^V $ which we prove are both independent of the mass of X. The variable cos θV approximates the polar production angle of Y, and we find that it possesses greater statistical power in determining the spin of this particle than a previous, related variable, cos θll [1]. $ mathcal{A}_{{ll}}^V $ is an asymmetry which can provide information about the couplings of a spin half Y. Because these variables can be used from the outset, without any knowledge of the masses of the new particles, we find here that it is possible to reverse the usual ‘mass before spin’ determination timeline.