Study of e + e - →H 0 A 0 production and the constraint on dark matter density
Study of e + e - →H 0 A 0 production and the constraint on dark matter density
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e + e - →H 0 A 0 产生及其对暗物质密度约束的研究
DOI：
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发表时间：
2008
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通讯作者：
B. Hooberman
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作者：
M. Battaglia;N. Kelley;B. Hooberman
本文报告了一项在\(\sqrt{s}=1\) TeV下对超对称中性重希格斯玻色子产生过程\(e^{+}e^{-}\to H^{0}A^{0}\)的研究结果，该研究使用了完全模拟和重建的事件。所采用的超对称模型参数与遗迹暗物质密度相符，如果暗物质密度是由于早期宇宙中中性微子通过\(A^{0}\)玻色子湮灭产生的。重希格斯玻色子质量、宽度和衰变分支比的精度估计为\(\frac{\Delta M_{A^{0}}}{M_{A^{0}}}=0.0024\)，\(\frac{\Delta\Gamma_{A^{0}}}{\Gamma_{A^{0}}}=0.19\)，\(\frac{\Delta BR(A^{0}\to b\bar{b})}{BR(A^{0}\to b\bar{b})}=0.07\)以及\(\frac{\Delta BR(A^{0}\to\tau^{+}\tau^{-})}{BR(A^{0}\to\tau^{+}\tau^{-})}=0.15\)。这些结果与大型强子对撞机（LHC）和正负电子对撞机的其他测量结果相结合，可以将超对称暗物质密度推断到相对精度\(\frac{\Delta\omega_{\chi}h^{2}}{\omega_{\chi}h^{2}}=0.08\)。
This paper reports the results of a study of the supersymmetric neutral heavy Higgs boson production process e{sup +}e{sup -}{yields}H{sup 0}A{sup 0} at {radical}(s)=1 TeV performed using fully simulated and reconstructed events. The adopted parameters for the supersymmetric models are compatible with the relic dark matter density if this is due to neutralinos annihilating through the A{sup 0} boson in the early universe. The accuracies on the heavy Higgs boson masses, widths, and decay branching fractions are estimated to be {delta}M{sub A{sup 0}}/M{sub A{sup 0}}=0.0024 {delta}{gamma}{sub A{sup 0}}/{gamma}{sub A{sup 0}}=0.19, {delta}BR(A{sup 0}{yields}bb)/BR(A{sup 0}{yields}bb)=0.07, and {delta}BR(A{sup 0}{yields}{tau}{sup +}{tau}{sup -})/BR(A{sup 0}{yields}{tau}{sup +}{tau}{sup -})=0.15 These results, combined with other measurements from the LHC and an e{sup +}e{sup -} collider, allow the supersymmetric dark matter density to be inferred to a relative accuracy {delta}{omega}{sub {chi}}h{sup 2}/{omega}{sub {chi}}h{sup 2}=0.08.