Searching for scalar boson decaying into light boson at collider experiments in model

Takaaki Nomura; Takashi Shimomura

doi:10.1140/epjc/s10052-019-7094-8

EPJ

Searching for scalar boson decaying into light $$Z'$$

boson at collider experiments in $U(1)_{L_\mu - L_\tau }$ model

Takaaki Nomura¹ and Takashi Shimomura²^*

¹ School of Physics, KIAS, Seoul, 130-722, Korea
² Faculty of Education, Miyazaki University, Miyazaki, 889-2192, Japan

Received: 27 November 2018
Accepted: 1 July 2019
Published online: 13 July 2019

Abstract

We study a model with $U(1)_{L_\mu - L_\tau }$ gauge symmetry and discuss collider searches for a scalar boson, which breaks $U(1)_{L_\mu - L_\tau }$ symmetry spontaneously, decaying into light $$Z'$$

gauge boson. In this model, the new gauge boson, $$Z'$$

, with a mass lighter than ${\mathcal {O}}(100)$ MeV, plays a role in explaining the anomalous magnetic moment of muon via one-loop contribution. For the gauge boson to have such a low mass, the scalar boson, $\phi$ with ${\mathcal {O}}(100)$ GeV mass appears associated with the symmetry breaking. We investigate experimental constraints on $U(1)_{L_\mu - L_\tau }$ gauge coupling, kinetic mixing, and mixing between the SM Higgs and $\phi$ . Then collider search is discussed considering $\phi$ production followed by decay process $\phi \rightarrow Z' Z'$ at the large hadron collider and the international linear collider. We also estimate discovery significance at the linear collider taking into account relevant kinematical cut effects.

12 Internat. Congress of the Balkan Physical Union
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EPJ

Searching for scalar boson decaying into light boson at collider experiments in $U(1)_{L_\mu - L_\tau }$ model

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