Pseudoscalar boson and standard model-like Higgs boson productions at the LHC in the simplest little Higgs model

Abstract

In the framework of the simplest little Higgs model (SLHM), we perform a comprehensive study for the pair productions of the pseudoscalar boson η and SM-like Higgs boson h at LHC, namely gg(bb) → ηη, gg(qq) → ηh and gg(bb) → hh. These production processes provide a way to probe the couplings between Higgs bosons. We find that the cross section of gg → ηη always dominates over that of bb → ηη. When the Higgs boson h which mediates these two processes is on-shell, their cross sections can reach several thousand f b and several hundred f b, respectively. When the intermediate state h is off-shell, those two cross sections are reduced by two orders of magnitude, respectively. The cross sections of gg → ηh and qq → ηh are about in the same order of magnitude, which can reach O(10 2 f b) for a light η boson. Besides, compared with the SM prediction, the cross section of a pair of SM-like Higgs bosons production at LHC can be enhanced sizably. Finally, we briefly discuss the observable signatures of ηη, ηh and hh at the LHC, respectively.

Higgs phenomenology in the Minimal Dilaton Model after Run I of the LHC

“…Similar exotic decay is also very attractive in Supersymmetric models and Little Higgs Models [89][90][91][92][93][94][95], such as in the Next-to-Minimal Supersymmetric Standard Model (NMSSM) according to the latest paper [10]. In the following, we define samples with ∆χ 2 < 1, 1 < ∆χ 2 < 4 and 4 < ∆χ 2 < 9 to be 1σ, 2σ and 3σ samples respectively, where ∆χ 2 = χ 2 − χ 2 min and χ 2 min denote the same global minimal values in the three fits as those in the heavy dilaton scenario.…”

ZHη vertex in the simplest little Higgs model

“…For previous studies related to the η particle in the SLH, we refer the reader to [13][14][15][16][17][18][19][20][21][22][23][24][25]. 3 Here we suppress the gauge boson kinetic terms which are assumed to be already canonically normalized.…”