Flavorite共零化
Flavored Co-annihilations
摘要：
超对称模型中的中性子暗物质在软超对称破缺扇区中的味破坏的存在下被重新审视。我们专注于风味违反sleptonic部门和研究的共同湮灭区域的影响。风味违反是由一个单一的$\tildeμ_R-\tildeτ_R$插入在slepton质量矩阵。在振幅内发生抵消的参数空间的某些区域中，对来自BR（$τ\to μ+ γ$）的这种插入的限制较弱。我们在参数空间中寻找重叠，其中共湮灭条件以及振幅内的取消都发生。在mSUGRA中，这种重叠区域是不存在的，而它们存在于具有非通用希格斯边界条件（NUHM）的模型中。味破坏的影响有两个方面：（a）它使共湮灭区向较轻的中性伴子质量移动;（b）共湮灭截面将被修改，包括味破坏图，这可以做出显着的贡献。即使风味破坏在目前允许的限度内，这也足以根据参数空间将mSUGRA中的热平均横截面修改约（10-15）%和NUHM中的热平均横截面修改约（20-30）%。在重叠区域中，风味破坏截面变得与风味保存截面相当，并且在某些情况下甚至占主导地位。对mSUGRA和NUHM病例的通道进行了比较研究。
英文摘要：
Neutralino dark matter in supersymmetric models is revisited in the presence of flavor violation in the soft supersymmetry breaking sector. We focus on flavor violation in the sleptonic sector and study the implications for the co-annihilation regions. Flavor violation is introduced by a single $\tildeμ_R-\tildeτ_R$ insertion in the slepton mass matrix. Limits on this insertion from BR($τ\to μ+ γ$) are weak in some regions of the parameter space where cancellations happen within the amplitudes. We look for overlaps in parameter space where both the co-annihilation condition as well as the cancellations within the amplitudes occur. In mSUGRA, such overlap regions are not existent, whereas they are present in models with non-universal Higgs boundary conditions (NUHM). The effect of flavor violation is two fold: (a) it shifts the co-annihilation regions towards lighter neutralino masses (b) the co-annihilation cross sections would be modified with the inclusion of flavor violating diagrams which can contribute significantly. Even if flavor violation is within the presently allowed limits, this is sufficient to modify the thermally averaged cross-sections by about (10-15)% in mSUGRA and (20-30)% in NUHM, depending on the parameter space. In the overlap regions, the flavor violating cross sections become comparable and in some cases even dominant to the flavor conserving ones. A comparative study of the channels is presented for mSUGRA and NUHM cases.
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