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arXiv 0801.1831hep-ph
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汤川统一SO(10)SUSY GUT的暗物质允许情景

Dark matter allowed scenarios for Yukawa-unified SO(10) SUSY GUTs

Howard Baer, Sabine Kraml, Sezen Sekmen, Heaya Summy

摘要:

基于规范群SO(10)的简单超对称大统一模型,除了规范和物质统一之外,还需要t-b-τ汤川耦合的统一。汤川统一,但是,只发生非常特殊的值的软超对称性破缺参数。我们使用马尔可夫链蒙特卡罗(MCMC)技术进行搜索,调查模型参数和sparticle质谱发生在Yukawa统一的超对称模型,我们还需要的遗迹密度的中性伴子暗物质饱和的WMAP测量的丰度。我们发现该谱具有三个质量标度的特征:多TeV范围内的第一/第二代标量,TeV范围内的第三代标量和\sim 100 GeV范围内的高吉诺。大多数解决方案给出的中性伴子暗物质的残余丰度太高。暗物质的差异可以通过1.允许中性伴子衰变为轴伴子加光子,2.强加的高吉诺质量非普适性或3.强加了一代人的非普遍性。此外,MCMC方法发现4。一个折衷的解决方案,标量质量不太重,中性伴子湮灭发生通过轻希格斯h共振。通过施加弱尺度希格斯软项边界条件,我们也能够产生5。低μ,m_A的溶液,中性伴子通过轻A共振湮灭,尽管这些溶液似乎被B_s \to μ^+μ^-分支分数的CDF/D 0测量所排除。基于汤川耦合统一和暗物质残余密度的双重要求,我们预言了LHC中350- 450 GeV胶子对产生的新物理信号.事件的特点是非常高的b喷流多重性和双轻子质量边缘附近mz 2-mz 1 \sim 50-75 GeV。

英文摘要:

Simple supersymmetric grand unified models based on the gauge group SO(10) require --in addition to gauge and matter unification-- the unification of t-b-τYukawa couplings. Yukawa unification, however, only occurs for very special values of the soft SUSY breaking parameters. We perform a search using a Markov Chain Monte Carlo (MCMC) technique to investigate model parameters and sparticle mass spectra which occur in Yukawa-unified SUSY models, where we also require the relic density of neutralino dark matter to saturate the WMAP-measured abundance. We find the spectrum is characterizd by three mass scales: first/second generation scalars in the multi-TeV range, third generation scalars in the TeV range, and gauginos in the \sim 100 GeV range. Most solutions give far too high a relic abundance of neutralino dark matter. The dark matter discrepancy can be rectified by 1. allowing for neutralino decay to axino plus photon, 2. imposing gaugino mass non-universality or 3. imposing generational non-universality. In addition, the MCMC approach finds 4. a compromise solution where scalar masses are not too heavy, and where neutralino annihilation occurs via the light Higgs h resonance. By imposing weak scale Higgs soft term boundary conditions, we are also able to generate 5. low μ, m_A solutions with neutralino annihilation via a light A resonance, though these solutions seem to be excluded by CDF/D0 measurements of the B_s\to μ^+μ^- branching fraction. Based on the dual requirements of Yukawa coupling unification and dark matter relic density, we predict new physics signals at the LHC from pair production of 350--450 GeV gluinos. The events are characterized by very high b-jet multiplicity and a dilepton mass edge around mz2-mz1 \sim 50-75 GeV.

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