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arXiv 1701.04442hep-phhep-ex
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$b{\bar b}WW$通道中的共振Di-Higgs产生：探测LHC的电弱相变

Resonant Di-Higgs Production in the $b{\bar b}WW$ Channel: Probing the Electroweak Phase Transition at the LHC

T. Huang, J. M. No, L. Pernié, M. Ramsey-Musolf, A. Safonov, M. Spannowsky, P. Winslow

备注：
26 Pages, 8 Figures
发表信息：
Phys. Rev. D 96, 035007 (2017)
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摘要：

我们分析了在$b\bar{b} W^+ W^-$（$W^{+} \to \ell^{+} ν_{\ell}$，$W^{-} \to \ell^{-} \barν_{\ell}$）通道的大型强子对撞机中共振双希格斯生产搜索的前景，作为标准模型希格斯门扩展中电弱相变性质的探针。为了最大限度地提高灵敏度，在这个最终的状态，我们开发了一种新的算法重建的$b \bar{b} W^+ W^-$不变质量的存在下的中微子的$W$衰变，从一种技术开发的共振衰减到$τ^{+}τ^{-}$对重建。我们表明，$b\bar{b} W^+ W^-$通道中的共振di-Higgs生产可能是电弱相变的竞争性探针，已经与CMS和ATLAS实验在运行2的LHC收集的数据集。在高亮度LHC阶段积累的大量数据的灵敏度的增加足以使该通道中共振di-Higgs生产的潜在发现成为可能。

英文摘要：

We analyze the prospects for resonant di-Higgs production searches at the LHC in the $b\bar{b} W^+ W^-$ ($W^{+} \to \ell^{+} ν_{\ell}$, $W^{-} \to \ell^{-} \barν_{\ell}$) channel, as a probe of the nature of the electroweak phase transition in Higgs portal extensions of the Standard Model. In order to maximize the sensitivity in this final state, we develop a new algorithm for the reconstruction of the $b \bar{b} W^+ W^-$ invariant mass in the presence of neutrinos from the $W$ decays, building from a technique developed for the reconstruction of resonances decaying to $τ^{+}τ^{-}$ pairs. We show that resonant di-Higgs production in the $b\bar{b} W^+ W^-$ channel could be a competitive probe of the electroweak phase transition already with the datasets to be collected by the CMS and ATLAS experiments in Run-2 of the LHC. The increase in sensitivity with larger amounts of data accumulated during the High Luminosity LHC phase can be sufficient to enable a potential discovery of the resonant di-Higgs production in this channel.

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