Spin before mass at the LHC
Spin before mass at the LHC
复制标题
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:
影响因子:
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通讯作者:
Tom Melia
中科院分区:
文献类型:
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作者:
Tom Melia
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.