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Explanation of the ATLAS Z-peaked excess in the NMSSM | | Junjie Cao
; Liangliang Shang
; Jin Min Yang
; Yang Zhang
; | | Date: |
29 Apr 2015 | | Abstract: | Recently the ATLAS collaboration reported a $3sigma$ excess in the
leptonic-$Z+jets+E_{T}^{miss}$ channel. This may be interpreted in the
Next-to-Minimal Supersymmetric Standard Model (NMSSM) by gluino pair production
with the decay chain $ ilde{g} o q ar{q} ilde{chi}_2^0 o q ar{q} Z
ilde{chi}_1^0$, where $ ilde{chi}_1^0$ and $ ilde{chi}_2^0$ denote the
lightest and the next-to-lightest neutralinos with singlino and bino as their
dominant components respectively. After exploring the relevant parameter space
of the NMSSM by considering the constraints from the ATLAS searches for $jets +
E_{T}^{miss}$ signals, we conclude that the NMSSM is able to explain the excess
at $1 sigma$ level with the number of the signal events reaching its measured
central value in optimal cases, and the best explanation comes from a
compressed spectrum such as $m_{ ilde{g}} simeq 650 {
m GeV}$,
$m_{ ilde{chi}_2^0} simeq 565 {
m GeV}$ and $m_{ ilde{chi}_1^0} simeq
465 {
m GeV}$. We also check the consistency of the ATLAS results with the
null result of the CMS on-$Z$ search. We find that under the CMS limits at
$95\%$ C.L., the event number of the ATLAS on-$Z$ signal can still reach 11 in
our scenario, which is about $1.2 sigma$ away from the measured central value. | | Source: | arXiv, 1504.7869 | | Services: | Forum | Review | PDF | Favorites | |
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