Searching heavier Higgs boson via di-Higgs production at LHC Run-2

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• 作者：Lan-Chun Lü ; ^a ; ^{lvlc10@mails.tsinghua.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Chun Du^b ; ^{chun.thazen.du@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Yaquan Fang^b ; ^{fangyq@ihep.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Hong-Jian He^a ; ^c ; ^d ; ^{hjhe@tsinghua.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Huijun Zhang^e ; ^{huijun.zhang@cern.ch" class="auth_mail" title="E-mail the corresponding author}
• 关键词：LHC ; New Higgs boson ; Beyond standard model searches
• 刊名：Physics Letters B
• 出版年：2016
• 出版时间：10 April 2016
• 年：2016
• 卷：755
• 期：Complete
• 页码：509-522
• 全文大小：1887 K

文摘

The discovery of a light Higgs particle $h^0(125\text{GeV})$ opens up new prospect for searching heavier Higgs boson(s) at the LHC Run-2, which will unambiguously point to new physics beyond the standard model (SM). We study the detection of a heavier neutral Higgs boson H⁰$H^0$ via di-Higgs production channel at the LHC (14 TeV), H⁰→h⁰h⁰→WW^⁎γγ$H^0\to h^0{h}^0\to W{W}^{⁎}\gamma \gamma$. This directly probes the Hhh   cubic Higgs interaction, which exists in most extensions of the SM Higgs sector. For the decay products of final states WW^⁎$W{W}^{⁎}$, we include both pure leptonic mode $W{W}^{⁎}\to \ell \overline{\nu }\overline{\ell }\nu$ and semi-leptonic mode $W{W}^{⁎}\to q{\overline{q}}^{\prime }\ell \nu$. We analyze signals and backgrounds by performing fast detector simulation for the full process $pp\to H\to hh\to W{W}^{⁎}\gamma \gamma \to \ell \overline{\nu }\overline{\ell }\nu \gamma \gamma$ and $pp\to H\to hh\to W{W}^{⁎}\gamma \gamma \to \ell \nu q{\overline{q}}^{\prime }\gamma \gamma$, over the mass range M_H=250–600 GeV$M_H=250\text{–}600\text{GeV}$. For generic two-Higgs-doublet models (2HDM), we present the discovery reach of the heavier Higgs boson at the LHC Run-2, and compare it with the current Higgs global fit of the 2HDM parameter space.