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arXiv 0909.4812hep-ph
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希格斯玻色子现象学和RS方案中的VEV位移

Higgs boson phenomenology and VEV shift in the RS scenario

Charles Bouchart, Gregory Moreau

摘要:

在解决规范层次问题的扭曲额外维度模型的框架下,我们考虑了通常假设下的散装保管对称性的兰德尔Sundrum(RS)的情况。详细地表明,规范玻色子与其Kaluza-Klein(KK)激发的混合对希格斯玻色子玻色子真空期望值(VEV)可能存在较大的修正.建立了与弱电精密试验的联系。一个值得注意的结果是,正确处理Higgs VEV导致下限在95% C. L.处的增加。在KK质量上,可以达到+30%(通常接受的值)。对于希格斯质量120 GeV < m_h < 150 GeV,[从更新的精确数据]获得的第一个KK规范玻色子质量的极限在3.3 - 4.0 TeV之间。VEV修正在对Higgs耦合的修正中也起着核心作用。我们发现可能大量的RS校正的各种希格斯耦合能够影响其现象学,从希格斯发现在LHC比标准模型(SM)更具挑战性。在RS中发现的希格斯粒子产生/衰变率的偏差将在ILC和LHC中进行测试。这样的RS特征甚至可以在ILC中用于区分SM之外的几种模型。最后,指出了用轻希格斯玻色子玻色子(m_h ~ 99 GeV)解释LEP 2观测到的2.3 σ过剩的可能性。

英文摘要:

In the framework of warped extra dimension models addressing the gauge hierarchy problem, we consider the Randall-Sundrum (RS) scenario under the usual hypothesis of a bulk custodial symmetry. It is shown in detail that there can exist large corrections to the Higgs boson Vacuum Expectation Value (VEV) induced by mixings of the gauge bosons with their Kaluza-Klein (KK) excitations. The connection with electroweak precision tests is developed. A noteworthy result is that the correct treatment of the Higgs VEV leads to an increase of the lower limit at 95% C.L. on KK masses that can reach +30% (from usually accepted values). For a Higgs mass 120 GeV < m_h < 150 GeV, the obtained limit [from updated precision data] on the first KK gauge boson mass lies in the range 3.3 - 4.0 TeV. The VEV corrections also play a central role in the corrections to the Higgs couplings. We find possibly substantial RS corrections to the various Higgs couplings able to affect its phenomenology, starting with a Higgs discovery at LHC more challenging than in the Standard Model (SM). The deviations to the Higgs production/decay rates found in RS will be testable at ILC as well as at LHC. Such RS signatures could even be used at ILC to discriminate among several models beyond the SM. Finally, the possibility of a light Higgs boson (m_h ~ 99 GeV) interpreting the excess at 2.3 Sigma observed at LEP2 is pointed out.

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