Light doubly charged Higgs boson via the channel at LHC

Zhaofeng Kang; Jinmian Li; Tianjun Li; Yandong Liu; Guo-Zhu Ning

doi:10.1140/epjc/s10052-015-3774-1

EPJ

Light doubly charged Higgs boson via the $$WW^*$$

channel at LHC

Zhaofeng Kang¹^,2, Jinmian Li³^,4, Tianjun Li⁴^,5, Yandong Liu⁴^* and Guo-Zhu Ning²

¹ School of Physics, Korea Institute for Advanced Study, Seoul, 130-722, Korea
² Center for High-Energy Physics, Peking University, Beijing, 100871, People’s Republic of China
³ Department of Physics, ARC Centre of Excellence for Particle Physics at the Terascale, University of Adelaide, Adelaide, SA, 5005, Australia
⁴ State Key Laboratory of Theoretical Physics, Kavli Institute for Theoretical Physics China (KITPC), Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China
⁵ School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, 610054, People’s Republic of China

Received: 25 June 2015
Accepted: 5 November 2015
Published online: 7 December 2015

Abstract

The doubly charged Higgs bosons $H^{\pm \pm }$ searches at the large hadron collider (LHC) have been studied extensively and strong bound is available for $H^{\pm \pm }$ dominantly decaying into a pair of same-sign di-leptons. In this paper we point out that there is a large cavity in the light $H^{\pm \pm }$ mass region left unexcluded. In particular, $H^{\pm \pm }$ can dominantly decay into WW or $$WW^*$$

(For instance, in the type-II seesaw mechanism the triplet acquires a vacuum expectation value around 1 GeV), and then it is found that $H^{\pm \pm }$ with mass even below $$2m_W$$

remains untouched by the current collider searches. Searching for such a $H^{\pm \pm }$ at the LHC is the topic of this paper. We perform detailed signal and background simulation, especially including the non-prompt $t\bar{t}$ background which is the dominant one nevertheless ignored before. We show that such $H^{\pm \pm }$ should be observable at the 14 TeV LHC with 10–30 fb $^{-1}$ integrated luminosity.

12 Internat. Congress of the Balkan Physical Union
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EPJ

Light doubly charged Higgs boson via the channel at LHC

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