Note on 125 GeV spin-2 particle
Note on 125 GeV spin-2 particle
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DOI：
10.1016/j.physletb.2013.01.016
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发表时间：
2012-10
影响因子：
4.4
通讯作者：
C. Geng;Da Huang;Yong Tang;Yue-Liang Wu
中科院分区：
文献类型：
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作者：
C. Geng;Da Huang;Yong Tang;Yue-Liang Wu
在大型强子对撞机上，ATLAS和CMS都观察到一种新的玻色子，大约在125 GeV左右，没有特定的自旋。由于它衰变为双光子，根据朗道-杨定理排除了自旋为1的情况，所以它留下了0或2作为新玻色子可能的最低自旋。我们将这个新的玻色子看作是一个自旋为2的大质量类引力子G，而不是已知的自旋为0的类希格斯玻色子，它在超维理论中大量存在，并将重点放在了它的现象学上。特别地，我们用标准模型（SM）中的规范玻色子和费米子V和f（‘）计算了G→Vff¯’的三体衰变，并将我们的结果与标准模型（SM）中的希格斯玻色子的结果进行了比较。通过拟合数据估计了G和v之间的耦合。提出了一种新的可观测值，可以区分G和希格斯粒子。
A new boson around 125 GeV without specific spin has been observed by both ATLAS and CMS at the LHC. Since its decay into a diphoton excludes the spin-1 case by the Landau–Yang theorem, it leaves 0 or 2 as the possible lowest spin for the new boson. Instead of the well-established spin-0 Higgs-like boson, we take this new boson to be a spin-2 massive graviton-like particle denoted as G, which exists copiously in extra-dimension theories, and concentrate on its phenomenology. In particular, we calculate the three-body decays of G→Vff¯′with V and f(′)the gauge boson and fermions in the standard model (SM) and compare our results with those of the SM Higgs boson. The couplings between G and Vs are also estimated by fitting the data. A new observable that can distinguish G from the Higgs is proposed.