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arXiv 0909.3139hep-phastro-ph.COhep-th
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SO(10)中GUT和PAMELA的宇宙正电子衰变

Decaying LSP in SO(10) GUT and PAMELA's Cosmic Positron

Bumseok Kyae

摘要:

我们假设最小超对称标准模型中最轻的超对称粒子是暗物质。如果一个右手中微子(ν^c_1)比类双中微子轻,并且它的超伴子(\tilde ν^c_1)产生真空期望值(VEV),自然会引起极小的R宇称破缺,则类双中微子能通过SO(10)规范相互作用衰变。如果{ \bf 16}_H的VEV标度比{ \bf 45}_H的VEV(\approx 10^{16} GeV)低几个数量级,并且如果slepton(\tilde{e}^c_1)比squarks相对较轻,轻子衰变模式可能占主导地位。LSP的所需衰减速率,T_x \sim 10^{-26}秒。{-1}解释PAMELA数据可以自然实现,因为介导LSP衰变的Gaugino是超重的。根据PAMELA数据,可以确定SU(3)_c x SU(2)_L x SU(2)_R x U(1)_{B-L}破缺标度(或{ \bf 16}_H VEV标度)。整体对称性是抑制RH(s)中微子与MSSM场之间汤川耦合的必要条件。即使一个RH中微子相当轻,提供极轻的三个物理中微子及其振荡的跷跷板机制仍然在起作用。

英文摘要:

We suppose that the lightest supersymmetric particle (LSP) in the minimal supersymmetric standard model (MSSM) is the dark matter. The bino-like LSP can decay through the SO(10) gauge interactions, if one right-handed (RH) neutrino (ν^c_1) is lighter than the LSP and its superpartner (\tildeν^c_1) develops a vacuum expectation value (VEV), raising extremely small R-parity violation naturally. The leptonic decay modes can be dominant, if the VEV scale of {\bf 16}_H is a few orders of magnitude lower than the VEV of {\bf 45}_H (\approx 10^{16} GeV), and if a slepton (\tilde{e}^c_1) is relatively lighter than squarks. The desired decay rate of the LSP, Γ_χ \sim 10^{-26} sec.^{-1} to explain PAMELA data can be naturally achieved, because the gaugino mediating the LSP decay is superheavy. From PAMELA data, the SU(3)_c x SU(2)_L x SU(2)_R x U(1)_{B-L} breaking scale (or the {\bf 16}_H VEV scale) can be determined. A global symmetry is necessary to suppress the Yukawa couplings between one RH (s)neutrino and the MSSM fields. Even if one RH neutrino is quite light, the seesaw mechanism providing the extremely light three physical neutrinos and their oscillations is still at work.

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