Connecting the LHC diphoton excess to the Galatic center gamma-ray excess
Connecting the LHC diphoton excess to the Galatic center gamma-ray excess
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将大型强子对撞机双光子过剩与银河中心伽马射线过剩连接起来
DOI：
10.1103/physrevd.94.035019
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发表时间：
2016-05
影响因子：
5
通讯作者：
Zhou Yu-Feng
中科院分区：
文献类型：
--
作者：
Huang Xian-Jun;Zhang Wei-Hong;Zhou Yu-Feng
The recent LHC Run-2 data have shown a possible excess in diphoton events, suggesting the existence of a new resonance $\ensuremath{\phi}$ with mass $M\ensuremath{\sim}750\text{ }\text{ }\mathrm{GeV}$. If $\ensuremath{\phi}$ plays the role of a portal particle connecting the Standard Model and the invisible dark sector, the diphoton excess should be correlated with another photon excess, namely, the excess in the diffuse gamma rays towards the Galactic Center, which can be interpreted by the annihilation of dark matter (DM). We investigate the necessary conditions for a consistent explanation for the two photon excesses, especially the requirement on the width-to-mass ratio $\mathrm{\ensuremath{\Gamma}}/M$ and $\ensuremath{\phi}$ decay channels, in a collection of DM models where the DM particle can be scalar, fermionic, and vector, and $\ensuremath{\phi}$ can be generated through $s$-channel $gg$ fusion or $q\overline{q}$ annihilation. We show that the minimally required $\mathrm{\ensuremath{\Gamma}}/M$ is determined by a single parameter proportional to $({m}_{\ensuremath{\chi}}/M{)}^{n}$, where the integer $n$ depends on the nature of the DM particle. We find that for the scalar DM model with $\ensuremath{\phi}$ generated from $q\overline{q}$ annihilation, the minimally required $\mathrm{\ensuremath{\Gamma}}/M$ can be as low as $\mathcal{O}(1{0}^{\ensuremath{-}3})$. For the scalar DM model with $\ensuremath{\phi}$ generated from $gg$ fusion and fermionic DM model with $\ensuremath{\phi}$ from $q\overline{q}$ annihilation, the required $\mathrm{\ensuremath{\Gamma}}/M$ are typically of $\mathcal{O}(1{0}^{\ensuremath{-}2})$. The vector DM models, however, require very large $\mathrm{\ensuremath{\Gamma}}/M$ of order one. For the DM models which can consistently explain both the excesses, the predicted cross sections for gamma-ray line are typically of $\mathcal{O}(1{0}^{\ensuremath{-}31}\char21{}1{0}^{\ensuremath{-}29})\text{ }\text{ }{\mathrm{cm}}^{3}\text{ }{\mathrm{s}}^{\ensuremath{-}1}$, which are close to the current limits from the Fermi-LAT experiment.
The recent LHC Run-2 data have shown a possible excess in diphoton events, suggesting the existence of a new resonance $\ensuremath{\phi}$ with mass $M\ensuremath{\sim}750\text{ }\text{ }\mathrm{GeV}$. If $\ensuremath{\phi}$ plays the role of a portal particle connecting the Standard Model and the invisible dark sector, the diphoton excess should be correlated with another photon excess, namely, the excess in the diffuse gamma rays towards the Galactic Center, which can be interpreted by the annihilation of dark matter (DM). We investigate the necessary conditions for a consistent explanation for the two photon excesses, especially the requirement on the width-to-mass ratio $\mathrm{\ensuremath{\Gamma}}/M$ and $\ensuremath{\phi}$ decay channels, in a collection of DM models where the DM particle can be scalar, fermionic, and vector, and $\ensuremath{\phi}$ can be generated through $s$-channel $gg$ fusion or $q\overline{q}$ annihilation. We show that the minimally required $\mathrm{\ensuremath{\Gamma}}/M$ is determined by a single parameter proportional to $({m}_{\ensuremath{\chi}}/M{)}^{n}$, where the integer $n$ depends on the nature of the DM particle. We find that for the scalar DM model with $\ensuremath{\phi}$ generated from $q\overline{q}$ annihilation, the minimally required $\mathrm{\ensuremath{\Gamma}}/M$ can be as low as $\mathcal{O}(1{0}^{\ensuremath{-}3})$. For the scalar DM model with $\ensuremath{\phi}$ generated from $gg$ fusion and fermionic DM model with $\ensuremath{\phi}$ from $q\overline{q}$ annihilation, the required $\mathrm{\ensuremath{\Gamma}}/M$ are typically of $\mathcal{O}(1{0}^{\ensuremath{-}2})$. The vector DM models, however, require very large $\mathrm{\ensuremath{\Gamma}}/M$ of order one. For the DM models which can consistently explain both the excesses, the predicted cross sections for gamma-ray line are typically of $\mathcal{O}(1{0}^{\ensuremath{-}31}\char21{}1{0}^{\ensuremath{-}29})\text{ }\text{ }{\mathrm{cm}}^{3}\text{ }{\mathrm{s}}^{\ensuremath{-}1}$, which are close to the current limits from the Fermi-LAT experiment.
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750 GeV 双光子共振对双希格斯双峰模型及其希格斯场扩展的影响
影响因子：
5
作者：
Han Xiao-Fang;Wang Lei
通讯作者：
Wang Lei
DOI：
10.1016/j.nuclphysb.2016.05.002
发表时间：
2015-12
期刊：
Nuclear Physics
影响因子：
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作者：
Wei-Chih Huang;Y. S. Tsai;T. Yuan
通讯作者：
Wei-Chih Huang;Y. S. Tsai;T. Yuan
影响因子：
6.4
作者：
Hong-Bo Jin;Yue-Liang Wu;Yu-feng Zhou
通讯作者：
Hong-Bo Jin;Yue-Liang Wu;Yu-feng Zhou
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DOI：
10.1103/physrevd.93.095011
发表时间：
2015-12
期刊：
Physical Review D Particles and Fields
影响因子：
--
作者：
Ligong Bian;Ning Chen;Da Liu;Jing Shu
通讯作者：
Jing Shu
影响因子：
5
作者：
P. P. Dev-P.;D. Teresi
通讯作者：
P. P. Dev-P.;D. Teresi