Higgsino and Wino Dark Matter from Q-ball Decay in Affleck-Dine Baryogenesis

Abstract

We claim that the Higgsino-like and wino-like neutralinos can be good dark matter candidates if they are produced by the late time decay of Q-ball, which is generally formed in Affleck-Dine baryogenesis. The late time decays of the Q-balls into these LSP's and subsequent pair annihilations of the LSP's naturally lead to the desired mass density of dark matter. Furthermore, these dark matter can be much more easily detected by the dark-matter search experiments than the standard bino-like dark matter.

Figures (6)

• Figure 1: The contour plots of the relic abundance $\Omega_{\chi}$ of the Higgsino-like neutralino LSP in the $m_{\chi}$--$T_d$ plane. We have taken $h=0.7$, $M_1=(3/2)\mu$, $M_2=3\mu$, $\tan\beta = 5$, $m_{A^0}=300~\hbox{GeV}$, $a=0$, and $m_0 = 1~\hbox{TeV}$. The three shaded regions correspond to the range of $\Omega_{\chi}<0.1$, $0.1<\Omega_{\chi}<1$, $1<\Omega_{\chi}$, from the top to the bottom, respectively.
• Figure 2: The contour plots of the relic abundance $\Omega_{\chi}$ of the Higgsino-like neutralino LSP in the $m_{\chi}$--$T_d$ plane. The parameters are the same as Fig. \ref{['Fig-higgsino-sq1000']} except $m_0 = 330~\hbox{GeV}$. The three shaded regions correspond to the range of $\Omega_{\chi}<0.1$, $0.1<\Omega_{\chi}<1$, $1<\Omega_{\chi}$, from the top to the bottom, respectively.
• Figure 3: The contour plots of the relic abundance $\Omega_{\chi}$ of the wino-like neutralino LSP in the $m_{\chi}$--$T_d$ plane. We took $M_1 = (3/2)\mu$ and $M_2 = (1/2)\mu$. Other parameters are the same as Fig. \ref{['Fig-higgsino-sq1000']}. The three shaded regions correspond to the range of $\Omega_{\chi}<0.1$, $0.1<\Omega_{\chi}<1$, $1<\Omega_{\chi}$, from the top to the bottom, respectively.
• Figure 4: Contours of the detection rate for the Higgsino-like dark matter in $^{76}Ge$ detector. The four shaded regions correspond to the ranges of the detection rate $R>0.1$, $0.1\geq R>0.03$, $0.03\geq R>0.01$, $0.01\geq R\;\;(\hbox{events}/\hbox{kg}\cdot \hbox{day})$ from left to right, respectively. The parameters used in this calculation are the same as in Fig. \ref{['Fig-higgsino-sq1000']} except $\tan\beta$.
• Figure 5: Contours of the detection rate for the wino-like dark matter in $^{76}Ge$ detector. The four shaded regions correspond to the ranges of the detection rate $R>0.1$, $0.1\geq R>0.03$, $0.03\geq R>0.01$, $0.01\geq R\;\;(\hbox{events}/\hbox{kg}\cdot \hbox{day})$ from left to right, respectively. The parameters used in this calculation are the same as in Fig. \ref{['Fig-wino']} except $\tan\beta$.