Explanation of the ATLAS Z-peaked excess in the NMSSM

Recently the ATLAS collaboration reported a 3σ excess in the search for the events containing a dilepton pair from a Z boson and large missing transverse energy. Although the excess is not sufficiently significant yet, it is quite tempting to explain this excess by a well-motivated model beyond the standard model. In this paper we study a possibility of the minimal supersymmetric standard model (MSSM) for this excess. Especially, we focus on the MSSM spectrum where the sfermions are heavier than the gauginos and Higgsinos. We show that the excess can be explained by the reasonable MSSM mass spectrum.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

ATLAS Z excess in minimal supersymmetric standard model

Shirai

Terada

2015

“…The above goldstini nature is also realized in the NMSSM with a singlino-like neutralino LSP, where the singlino is the fermionic component of the additional singlet superfield Ŝ. Actually, some literature investigated this possibility with decay chains of g → q q χ0 2 → q qZ χ0 1 [9,12], and q → q χ0 2 → qZ χ0 1 [17,19], where in both cases χ0 2 and χ0 1 are the bino and singlino-like neutralinos, respectively. In this paper, we discuss another possibility in the NMSSM and consider the gluino pair production whose decay chain is g → g χ0…”

Section: Introductionmentioning

confidence: 98%

“…After the report, many scenarios in the MSSM as well as in the NMSSM have been proposed to explain the ATLAS on-Z excess without conflicting with constraints from various SUSY searches including the CMS on-Z result [6,[8][9][10][11][12][13][14][15][16][17][18][19][20]. To have on-shell Z bosons in final states while escaping other SUSY search constraints, scenarios with a gravitino as the lightest SUSY particle (LSP) seems to be one of the simplest possibilities.…”

Section: Introductionmentioning

confidence: 99%

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

Harigaya

Ibe

Kitahara

2016

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.

Explanation of the ATLAS Z-peaked excess by squark pair production in the NMSSM

Cao

Shang

Yang

et al. 2015

Self Cite

The ATLAS collaboration recently reported a 3σ excess in the leptonic-Z + jets + E miss T channel. We intend to interpret this excess by squark pair production in the Next-to-Minimal Supersymmetric Standard Model (NMSSM). The decay chain we employ isq → qχ 0 2 → qχ 0 1 Z, whereχ 0 1 andχ 0 2 denote the lightest and the next-to-lightest neutralinos with singlino and bino as their dominant components respectively. Our simulations indicate that after considering the constraints from the ATLAS searches for jets + E miss T signal the central value of the excess can be obtained for mq 1.2TeV, and if the constraint from the CMS on-Z search is further considered, more than 10 signal events are still attainable for mq 750GeV. Compared with the interpretation by gluino pair production, the squark explanation allows for a significantly wider range of mq as well as a less compressed SUSY mass spectrum. We also show that the squark explanation will be readily tested at the initial stage of the 14 TeV LHC.