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arXiv 0911.0217hep-ph
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$b\to sγ$中取消所隐含的SUSY和Higgs签名

SUSY and Higgs Signatures Implied by Cancellations in $b\to sγ$

Ning Chen, Daniel Feldman, Zuowei Liu, Pran Nath

摘要:

最近对标准模型(SM)对${\mathcal Br(b\to sγ)$贡献的重新评估暗示了新物理学的积极修正。由于带电的希格斯玻色子交换总是对这个分支比有积极的贡献,这个约束指向了相对较轻的带电希格斯粒子的可能性。结果发现,在HFAG约束和重新评估的SM结果之间的荷电希格斯粒子和超对称模型中的电荷子贡献大的取消发生。这样的抵消,然后关联的带电希格斯粒子和电荷质量往往意味着两者都是轻的。还考虑纳入$g_μ-2$的最新评价。结合约束意味着存在几个轻粒子。签名所产生的这些轻sparticles的调查和分析表明,他们的早期发现在大型强子对撞机的参数空间的重要组成部分的可能性。我们还表明,对于某些限制区域的参数空间,如非常大的$\tanβ$下的$1σ$ HFAG约束,签名从希格斯生产取代那些从sparticle生产,并可能成为主要的签名为发现超对称性。

英文摘要:

Recent re-evaluations of the Standard Model (SM) contribution to ${\mathcal Br(b\to sγ)$ hint at a positive correction from new physics. Since a charged Higgs boson exchange always gives a positive contribution to this branching ratio, the constraint points to the possibility of a relatively light charged Higgs. It is found that under the HFAG constraints and with re-evaluated SM results large cancellations between the charged Higgs and the chargino contributions in supersymmetric models occur. Such cancellations then correlate the charged Higgs and the chargino masses often implying both are light. Inclusion of the more recent evaluation of $g_μ-2$ is also considered. The combined constraints imply the existence of several light sparticles. Signatures arising from these light sparticles are investigated and the analysis indicates the possibility of their early discovery at the LHC in a significant part of the parameter space. We also show that for certain restricted regions of the parameter space, such as for very large $\tanβ$ under the $1σ$ HFAG constraints, the signatures from Higgs production supersede those from sparticle production and may become the primary signatures for the discovery of supersymmetry.

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