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arXiv 1602.00977hep-ph
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Sgoldstino 750 GeV双光子共振的系统研究

Systematic Study of Diphoton Resonance at 750 GeV from Sgoldstino

Ran Ding, Yizhou Fan, Li Huang, Chuang Li, Tianjun Li, Shabbar Raza, Bin Zhu

摘要:

大型强子对撞机(LHC)的ATLAS和CMS合作组报道了双光子通道中的过剩事件,其不变质量约为750 GeV。在低能超对称破缺下,我们系统地考虑了sgoldstino标量$S$作为新的共振,它是CP偶标量$s$和CP奇赝标量$a$的线性组合.由于我们证明了$s$和$a$可以简并或具有大的质量分裂,因此我们考虑了以下三种情况下的两种情况:(1)单共振。$s$是750 GeV共振衰变到一对1 GeV赝标量$a$。在适当的衰变长度下,这两个$a$衰变成准直的光子对,这对光子在LHC上无法区分,并且可能以双光子而不是四个光子出现。(2)孪生共振。质量差约为40 GeV的$m_{s}\approx m_{a}$,并且$s$和$a$都衰变为双光子对。对于产生,我们考虑了三种情况:(I)矢量玻色子融合;(II)胶子胶子融合;(III)$q{\bar q}$对产生。在所有这些方案与两种共振,我们找到的参数空间,满足双光子产生截面从3到13 ${\rm fb}$和所有其他实验的限制。我们还讨论了衰减宽度。特别是,在第三种情况下,我们观察到的生产截面很小,但$s$或$a$的衰变宽度可以从40到60 GeV。

英文摘要:

The ATLAS and CMS Collaborations of the Large Hadron Collider (LHC) have reported an excess of events in diphoton channel with invariant mass of about 750 GeV. With low energy supersymmetry breaking, we systematically consider the sgoldstino scalar $S$ as the new resonance, which is a linear combination of the CP-even scalar $s$ and CP-odd pseudoscalar $a$. Because we show that $s$ and $a$ can be degenerated or have large mass splitting, we consider two cases for all the following three scenarios: (1) Single resonance. $s$ is the 750 GeV resonance decays to a pair of 1 GeV pseudoscalar $a$. With suitable decay length, these two $a$ decay into collimated pair of photons which cannot be distinguished at the LHC and may appear as diphotons instead of four photons. (2) Twin resonances. $m_{s}\approx m_{a}$ with a mass difference of about 40 GeV and both $s$ and $a$ decay into diphoton pairs. For productions, we consider three scenarios: (I) vector boson fusion; (II) gluon gluon fusion; (III) $q{\bar q}$ pair production. In all these scenarios with two kinds of resonances, we find the parameter space that satisfies the diphoton production cross section from 3 to 13 ${\rm fb}$ and all the other experimental constraints. And we address the decay width as well. In particular, in the third scenario, we observe that the production cross section is small but the decay width of $s$ or $a$ can be from 40 to 60 GeV.

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