ATLAS on-Z excess via gluino-Higgsino-singlino decay chains in the NMSSM

Abstract

Recently the ATLAS experiment has reported 3.0 σ excess in an on-Z signal region in searches for supersymmetric particles. We find that the next-to-minimal supersymmetric standard model can explain this excess by the production of gluinos which mainly decay viag → gχ 0 2,3 → gZχ 0 1 whereχ 0 2,3 andχ 0 1 are the Higgsino and the singlinolike neutralinos, respectively. We show that the observed dark matter density is explained by the thermal relic density of the singlino-like neutralino, simultaneously. We also discuss the searches for the Higgs sector of this scenario at the Large Hadron Collider.

Models of a 750 GeV quarkonium and the LHC excesses

“…In this work, the ATLAS excesses are interpreted as a contribution originated from BSM physics. See Refs [12][13][14][15][16][17][18][19][20][21][22][23][24]. for previous theoretical efforts interpreting the excess.…”

ATLAS on- Z excess through vector-like quarks

“…The observed number of the signal events are 16 and 13 for the final-state electrons and muons, respectively, whereas the standard model (SM) predicts 4.2 ± 1.6 and 6.4 ± 2.2. The discrepancy corresponds to the 3σ level, which stimulates many theoretical studies [2][3][4][5][6][7][8][9][10][11][12][13][14]. #1 The on-Z signal was investigated originally to search for the supersymmetry (SUSY) [1], and most of the theoretical works have been performed within the framework of SUSY.…”