Unstable ${{\widetilde{\boldsymbol \chi}}_{{1}}^{0}}$ (Lightest Neutralino) mass limit INSPIRE search

Unless otherwise stated, results in this section assume spectra and production rates as evaluated in the MSSM. Unless otherwise stated, the goldstino or gravitino mass ${\mathit m}_{{{\widetilde{\mathit G}}}}$ is assumed to be negligible relative to all other masses. In the following, ${{\widetilde{\mathit G}}}$ is assumed to be undetected and to give rise to a missing energy ($\not E$) signature.

Some earlier papers are now obsolete and have been omitted. They were last listed in our PDG 2014 edition: K. Olive, $\mathit et~al.$ (Particle Data Group), Chinese Physics C38 070001 (2014) (http://pdg.lbl.gov).

VALUE (GeV) CL% DOCUMENT ID TECN  COMMENT
$\bf{> 380}$ 95 1
KHACHATRYAN
2014L
CMS ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit Z}}{{\widetilde{\mathit G}}}$ simplified models,GMSB
• • • We do not use the following data for averages, fits, limits, etc. • • •
2
AAIJ
2017Z
displaced vertex with associated ${{\mathit \mu}}$
3
KHACHATRYAN
2016BX
${}\geq{}3{{\mathit \ell}^{\pm}}$, RPV, ${{\mathit \lambda}}$ or ${{\mathit \lambda}^{\,'}}$ couplings, wino- or higgsino-like neutralinos
4
AAD
2014BH
ATLS 2${{\mathit \gamma}}$ + $\not E_T$, GMSB, SPS8
5
AAD
2013AP
ATLS 2${{\mathit \gamma}}$ + $\not E_T$, GMSB, SPS8
$\text{none 220 - 380}$ 95 6
AAD
2013Q
ATLS ${{\mathit \gamma}}$ + ${{\mathit b}}$ + $\not E_T$, higgsino-like neutralino, GMSB
7
AAD
2013R
ATLS ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit \mu}}{{\mathit j}}{{\mathit j}}$ , RPV, ${{\mathit \lambda}_{{211}}^{\,'}}{}\not=$ 0
8
AALTONEN
2013I
CDF ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\widetilde{\mathit G}}}$ , $\not E_T$, GMSB
$> 220$ 95 9
CHATRCHYAN
2013AH
CMS ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\widetilde{\mathit G}}}$ , GMSB, SPS8, $\mathit c{{\mathit \tau}}$ $<$ 500 mm
10
AAD
2012CP
ATLS 2${{\mathit \gamma}}$ +$\not E_T$, GMSB
11
AAD
2012CT
ATLS ${}\geq{}4{{\mathit \ell}^{\pm}}$, RPV
12
AAD
2012R
ATLS ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit \mu}}{{\mathit j}}{{\mathit j}}$ , RPV, ${{\mathit \lambda}_{{211}}^{\,'}}{}\not=$ 0
13
ABAZOV
2012AD
D0 ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit Z}}{{\widetilde{\mathit G}}}{{\widetilde{\mathit G}}}$ , GMSB
14
CHATRCHYAN
2012BK
CMS 2${{\mathit \gamma}}$ + $\not E_T$, GMSB
15
CHATRCHYAN
2011B
CMS ${{\widetilde{\mathit W}}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\widetilde{\mathit G}}}$ , ${{\widetilde{\mathit W}}^{\pm}}$ $\rightarrow$ ${{\mathit \ell}^{\pm}}{{\widetilde{\mathit G}}}$ , GMSB
$> 149$ 95 16
AALTONEN
2010
CDF ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\widetilde{\mathit \chi}}}{{\widetilde{\mathit \chi}}}$ , ${{\widetilde{\mathit \chi}}}={{\widetilde{\mathit \chi}}_{{2}}^{0}}$, ${{\widetilde{\mathit \chi}}_{{1}}^{\pm}}$, ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\widetilde{\mathit G}}}$ , GMSB
$> 175$ 95 17
ABAZOV
2010P
D0 ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\widetilde{\mathit G}}}$ , GMSB
$> 125$ 95 18
ABAZOV
2008F
D0 ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\widetilde{\mathit \chi}}}{{\widetilde{\mathit \chi}}}$ , ${{\widetilde{\mathit \chi}}}={{\widetilde{\mathit \chi}}_{{2}}^{0}}$, ${{\widetilde{\mathit \chi}}_{{1}}^{\pm}}$, ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\widetilde{\mathit G}}}$ , GMSB
19
ABULENCIA
2007H
CDF RPV, $\mathit LL\bar E$
$> 96.8$ 95 20
ABBIENDI
2006B
OPAL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\widetilde{\mathit B}}}{{\widetilde{\mathit B}}}$ , ( ${{\widetilde{\mathit B}}}$ $\rightarrow$ ${{\widetilde{\mathit G}}}{{\mathit \gamma}}$ )
21
ABDALLAH
2005B
DLPH ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\widetilde{\mathit G}}}{{\widetilde{\mathit \chi}}_{{1}}^{0}}$ , ( ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ $\rightarrow$ ${{\widetilde{\mathit G}}}{{\mathit \gamma}}$ )
$> 96$ 95 22
ABDALLAH
2005B
DLPH ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\widetilde{\mathit B}}}{{\widetilde{\mathit B}}}$ , ( ${{\widetilde{\mathit B}}}$ $\rightarrow$ ${{\widetilde{\mathit G}}}{{\mathit \gamma}}$ )
1  KHACHATRYAN 2014L searched in 19.5 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV for evidence of direct pair production of neutralinos with Higgs or ${{\mathit Z}}$-bosons in the decay chain, leading to ${{\mathit H}}{{\mathit H}}$ , ${{\mathit H}}{{\mathit Z}}$ and ${{\mathit Z}}{{\mathit Z}}$ final states with missing transverse energy. The decays of $16 - 20$. a Higgs boson to a ${{\mathit b}}$-quark pair, to a photon pair, and to final states with leptons are considered in conjunction with hadronic and leptonic decay modes of the ${{\mathit Z}}$ and ${{\mathit W}}$ bosons. No significant excesses over the expected SM backgrounds are observed. The results are interpreted in the context of GMSB simplified models where the decays ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit H}}{{\widetilde{\mathit G}}}$ or ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit Z}}{{\widetilde{\mathit G}}}$ take place either 100$\%$ or 50$\%$ of the time, see Figs. $16 - 20$.
2  AAIJ 2017Z searched in 1 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 7 TeV and in 2 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV for events containing a displaced vertex with one associated high transverse momentum ${{\mathit \mu}}$. No excess is observed above the background expected from Standard Model processes. The results are used to set 95$\%$ C.L. upper limits on the cross section times branching fractions of pair-produced neutralinos decaying non-promptly into a muon and two quarks. Long-lived particles in a mass range $23 - 198$ GeV are considered, see their Fig. 5 and Fig. 6.
3  KHACHATRYAN 2016BX searched in 19.5 ${\mathrm {fb}}{}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV for events containing 3 or more leptons coming from the electroweak production of wino- or higgsino-like neutralinos, assuming non-zero R-parity-violating leptonic couplings ${{\mathit \lambda}_{{122}}}$, ${{\mathit \lambda}_{{123}}}$, and ${{\mathit \lambda}_{{233}}}$ or semileptonic couplings ${{\mathit \lambda}_{{131}}^{\,'}}$, ${{\mathit \lambda}_{{233}}^{\,'}}$, ${{\mathit \lambda}_{{331}}^{\,'}}$, and ${{\mathit \lambda}_{{333}}^{\,'}}$. No excess over the expected background is observed and limits are derived on the neutralino mass, see Figs. 24 and 25.
4  AAD 2014BH searched in 20.3 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV for events containing non-pointing photons in a diphoton plus missing transverse energy final state. No excess is observed above the background expected from Standard Model processes. The results are used to set 95$\%$ C.L. exclusion limits in the contact of gauge-mediated supersymmetric breaking models, with the lightest neutralino being the next-to-lightest supersymmetric particle and decaying with a lifetime in the range from 0.25 ns to about 100 ns into a photon and a gravitino. For limits on the NLSP lifetime versus $\Lambda $ plane, for the SPS8 model, see their Fig. 7.
5  AAD 2013AP searched in 4.8 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 7 TeV for events containing non-pointing photons in a diphoton plus missing transverse energy final state. No excess is observed above the background expected from Standard Model processes. The results are used to set 95$\%$ C.L. exclusion limits in the context of gauge-mediated supersymmetric breaking models, with the lightest neutralino being the next-to-lightest supersymmetric particle and decaying with a lifetime in excess of 0.25 ns into a photon and a gravitino. For limits in the NLSP lifetime versus ${{\mathit \Lambda}}$ plane, for the SPS8 model, see their Fig. 8.
6  AAD 2013Q searched in 4.7 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 7 TeV for events containing a high-$p_T$ isolated photon, at least one jet identified as originating from a bottom quark, and high missing transverse momentum. Such signatures may originate from supersymmetric models with gauge-mediated supersymmetry breaking in events in which one of a pair of higgsino-like neutralinos decays into a photon and a gravitino while the other decays into a Higgs boson and a gravitino. No significant excess above the expected background was found and limits were set on the neutralino mass in a generalized GMSB model (GGM) with a higgsino-like neutralino NLSP, see their Fig. 4. Intermediate neutralino masses between 220 and 380 GeV are excluded at 95$\%$ C.L, regardless of the squark and gluino masses, purely on the basis of the expected weak production.
7  AAD 2013R looked in 4.4 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 7 TeV for events containing new, heavy particles that decay at a significant distance from their production point into a final state containing a high-momentum muon and charged hadrons. No excess over the expected background is observed and limits are placed on the production cross-section of neutralinos via squarks for various ${\mathit m}_{{{\widetilde{\mathit q}}}}$, ${\mathit m}_{{{\widetilde{\mathit \chi}}_{{1}}^{0}}}$ in an R-parity violating scenario with ${{\mathit \lambda}_{{211}}^{\,'}}{}\not=$ 0, as a function of the neutralino lifetime, see their Fig. 6.
8  AALTONEN 2013I searched in 6.3 fb${}^{-1}$ of ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\sqrt {s }$ = 1.96 TeV for events containing $\not E_T$ and a delayed photon that arrives late in the detector relative to the time expected from prompt production. No evidence of delayed photon production is observed.
9  CHATRCHYAN 2013AH searched in 4.9 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 7 TeV for events containing $\not E_T$ and a delayed photon that arrives late in the detector relative to the time expected from prompt production. No significant excess above the expected background was found and limits were set on the pair production of ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ depending on the neutralino proper decay length, see Fig. 8. Supersedes CHATRCHYAN 2012BK.
10  AAD 2012CP searched in 4.8 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 7 TeV for events with two photons and large $\not E_T$ due to ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\widetilde{\mathit G}}}$ decays in a GMSB framework. No significant excess above the expected background was found and limits were set on the neutralino mass in a generalized GMSB model (GGM) with a bino-like neutralino NLSP, see Figs. 6 and 7. The other sparticle masses were decoupled, tan ${{\mathit \beta}}$ = 2 and $\mathit c{{\mathit \tau}_{{NLSP}}}$ $<$ 0.1 mm. Also, in the framework of the SPS8 model, limits are presented in Fig. 8.
11  AAD 2012CT searched in 4.7 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 7 TeV for events containing four or more leptons (electrons or muons) and either moderate values of missing transverse momentum or large effective mass. No significant excess is found in the data. Limits are presented in a simplified model of $\mathit R$-parity violating supersymmetry in which charginos are pair-produced and then decay into a ${{\mathit W}}$-boson and a ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$, which in turn decays through an RPV coupling into two charged leptons ( ${{\mathit e}^{\pm}}{{\mathit e}^{\mp}}$ or ${{\mathit \mu}^{\pm}}{{\mathit \mu}^{\mp}}$ ) and a neutrino. In this model, limits are set on the neutralino mass as a function of the chargino mass, see Fig. 3a. Limits are also set in an $\mathit R$-parity violating mSUGRA model, see Fig. 3b.
12  AAD 2012R looked in 33 pb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 7 TeV for events containing new, heavy particles that decay at a significant distance from their production point into a final state containing a high-momentum muon and charged hadrons. No excess over the expected background is observed and limits are placed on the production cross-section of neutralinos via squarks for various (${\mathit m}_{{{\widetilde{\mathit q}}}}$, ${\mathit m}_{{{\widetilde{\mathit \chi}}_{{1}}^{0}}}$) in an R-parity violating scenario with ${{\mathit \lambda}}{}^{'}_{211}{}\not=$ 0, as a function of the neutralino lifetime, see their Fig. 8. Superseded by AAD 2013R.
13  ABAZOV 2012AD looked in 6.2 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 1.96 TeV for events with a photon, a ${{\mathit Z}}$-boson, and large $\not E_T$ in the final state. This topology corresponds to a GMSB model where pairs of neutralino NLSPs are either pair produced promptly or from decays of other supersymmetric particles and then decay to either ${{\mathit Z}}{{\widetilde{\mathit G}}}$ or ${{\mathit \gamma}}{{\widetilde{\mathit G}}}$ . No significant excess over the SM expectation is observed and a limit at 95$\%$ C.L. on the cross section is derived as a function of the effective SUSY breaking scale ${{\mathit \Lambda}}$, see Fig. 3. Assuming ${{\mathit N}_{{mes}}}$ = 2, ${{\mathit M}_{{mes}}}$ = 3 ${{\mathit \Lambda}}$, tan ${{\mathit \beta}}$ = 3, ${{\mathit \mu}}$ = 0.75 ${{\mathit M}_{{1}}}$, and ${{\mathit C}_{{grav}}}$ = 1, the model is excluded at 95$\%$ C.L. for values of ${{\mathit \Lambda}}$ $<$ 87 TeV.
14  CHATRCHYAN 2012BK searched in 2.23 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 7 TeV for events with two photons and large $\not E_T$ due to ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\widetilde{\mathit G}}}$ decays in a GMSB framework. No significant excess above the expected background was found and limits were set on the pair production of ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ depending on the neutralino lifetime, see Fig. 6.
15  CHATRCHYAN 2011B looked in 35 pb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$=7 TeV for events with an isolated lepton (${{\mathit e}}$ or ${{\mathit \mu}}$), a photon and $\not E_T$ which may arise in a generalized gauge mediated model from the decay of Wino-like NLSPs. No evidence for an excess over the expected background is observed. Limits are derived in the plane of squark/gluino mass versus Wino mass (see Fig. 4). Mass degeneracy of the produced squarks and gluinos is assumed.
16  AALTONEN 2010 searched in 2.6 fb${}^{-1}$ of ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\sqrt {s }$ = 1.96 TeV for diphoton events with large $\not E_T$. They may originate from the production of ${{\widetilde{\mathit \chi}}^{\pm}}$ in pairs or associated to a ${{\widetilde{\mathit \chi}}_{{2}}^{0}}$, decaying into ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ which itself decays in GMSB to ${{\mathit \gamma}}{{\widetilde{\mathit G}}}$ . There is no excess of events beyond expectation. An upper limit on the cross section is calculated in the GMSB model as a function of the ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ mass and lifetime, see their Fig. 2. A limit is derived on the ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ mass of 149 GeV for ${\mathit \tau}_{{{\widetilde{\mathit \chi}}_{{1}}^{0}}}{}\ll$1 ns, which improves the results of previous searches.
17  ABAZOV 2010P looked in 6.3 fb${}^{-1}$ of ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\sqrt {s }$ = 1.96 TeV for events with at least two isolated ${{\mathit \gamma}}$s and large $\not E_T$. These could be the signature of ${{\widetilde{\mathit \chi}}_{{2}}^{0}}$ and ${{\widetilde{\mathit \chi}}_{{1}}^{\pm}}$ production, decaying to ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ and finally ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\widetilde{\mathit G}}}$ in a GMSB framework. No significant excess over the SM expectation is observed, and a limit at 95$\%$ C.L. on the cross section is derived for ${{\mathit N}_{{mes}}}$ = 1, tan ${{\mathit \beta}}$ = 15 and ${{\mathit \mu}}$ $>$ 0, see their Fig. 2. This allows them to set a limit on the effective SUSY breaking scale ${{\mathit \Lambda}}$ $>$ 124 TeV, from which the excluded ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ mass range is obtained.
18  ABAZOV 2008F looked in 1.1 fb${}^{-1}$ of ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\sqrt {s }$ = 1.96 TeV for diphoton events with large $\not E_T$. They may originate from the production of ${{\widetilde{\mathit \chi}}^{\pm}}$ in pairs or associated to a ${{\widetilde{\mathit \chi}}_{{2}}^{0}}$, decaying to a ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ which itself decays promptly in GMSB to ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\widetilde{\mathit G}}}$ . No significant excess was found compared to the background expectation. A limit is derived on the masses of SUSY particles in the GMSB framework for $\mathit M$ = 2$\Lambda $, $\mathit N$ = 1, tan $\beta $ = 15 and $\mu $ $>$ 0, see Figure$~$2. It also excludes $\Lambda $ $<$ 91.5 TeV. Supersedes the results of ABAZOV 2005A. Superseded by ABAZOV 2010P.
19  ABULENCIA 2007H searched in 346 pb${}^{-1}$ of ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\sqrt {s }$ = 1.96 TeV for events with at least three leptons (${{\mathit e}}$ or ${{\mathit \mu}}$) from the decay of ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ via $\mathit LL\bar E$ couplings. The results are consistent with the hypothesis of no signal. Upper limits on the cross-section are extracted and a limit is derived in the framework of mSUGRA on the masses of ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ and ${{\widetilde{\mathit \chi}}_{{1}}^{\pm}}$, see e.g. their Fig. 3 and Tab. II.
20  ABBIENDI 2006B use 600 pb${}^{-1}$ of data from $\sqrt {s }$ = $189 - 209$ GeV. They look for events with diphotons + $\not E$ final states originating from prompt decays of pair-produced neutralinos in a GMSB scenario with ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ NLSP. Limits on the cross-section are computed as a function of m(${{\widetilde{\mathit \chi}}_{{1}}^{0}}$), see their Fig. 14. The limit on the ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ mass is for a pure Bino state assuming a prompt decay, with lifetimes up to $10^{-9}$s. Supersedes the results of ABBIENDI 2004N.
21  ABDALLAH 2005B use data from $\sqrt {s }$ = $180 - 209$~GeV. They look for events with single photons + $\not E$ final states. Limits are computed in the plane (m(${{\widetilde{\mathit G}}}$) , m(${{\widetilde{\mathit \chi}}_{{1}}^{0}}$)), shown in their Fig. 9b for a pure Bino state in the GMSB framework and in Fig. 9c for a no-scale supergravity model. Supersedes the results of ABREU 2000Z.
22  ABDALLAH 2005B use data from $\sqrt {s }$ = $130 - 209$~GeV. They look for events with diphotons + $\not E$ final states and single photons not pointing to the vertex, expected in GMSB when the ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ is the NLSP. Limits are computed in the plane (m(${{\widetilde{\mathit G}}}$), m(${{\widetilde{\mathit \chi}}_{{1}}^{0}}$)), see their Fig. 10. The lower limit is derived on the ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ mass for a pure Bino state assuming a prompt decay and ${\mathit m}_{{{\widetilde{\mathit e}}_{{R}}}}$ = ${\mathit m}_{{{\widetilde{\mathit e}}_{{L}}}}$ = 2 ${\mathit m}_{{{\widetilde{\mathit \chi}}_{{1}}^{0}}}$. It improves to 100~GeV for ${\mathit m}_{{{\widetilde{\mathit e}}_{{R}}}}$ = ${\mathit m}_{{{\widetilde{\mathit e}}_{{L}}}}$ = 1.1 ${\mathit m}_{{{\widetilde{\mathit \chi}}_{{1}}^{0}}}$. and the limit in the plane (m(${{\widetilde{\mathit \chi}}_{{1}}^{0}}$), m(${{\widetilde{\mathit e}}_{{R}}}$)) is shown in Fig. 10b. For long-lived neutralinos, cross-section limits are displayed in their Fig 11. Supersedes the results of ABREU 2000Z.
  References:
AAIJ 2017Z
EPJ C77 224 Search for Massive Long-Lived Particles Decaying Semileptonically in the LHCb Detector
KHACHATRYAN 2016BX
PR D94 112009 Searches for $\mathit R$-Parity-Violating Supersymmetry in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV in Final States with $0 - 4$ Leptons
AAD 2014BH
PR D90 112005 Search for Nonpointing and Delayed Photons in the Diphoton and Missing Transverse Momentum Final State in 8 TeV ${{\mathit p}}{{\mathit p}}$ Collisions at the LHC using the ATLAS Detector
KHACHATRYAN 2014L
PR D90 092007 Searches for Electroweak Neutralino and Chargino Production in Channels with Higgs, ${{\mathit Z}}$, and ${{\mathit W}}$ Bosons in ${{\mathit p}}{{\mathit p}}$ Collisions at 8 TeV
AAD 2013Q
PL B719 261 Search for Supersymmetry in Events with Photons, Bottom Quarks, and Missing Transverse Momentum in Proton$−$Proton Collisions at a Centre-of-Mass Energy of 7 TeV with the ATLAS Detector
AAD 2013R
PL B719 280 Search for Long-Lived, Heavy Particles in Final States with a Muon and Multi-Track Displaced Vertex in Proton$−$Proton Collisions at $\sqrt {s }$ = 7 TeV with the ATLAS Detector
AAD 2013AP
PR D88 012001 Search for Nonpointing Photons in the Diphoton and $\mathit E{}^{miss}_{T}$ Final State in $\sqrt {s }$ = 7 TeV Proton$−$Proton Collisions using the ATLAS Detector
AALTONEN 2013I
PR D88 031103 A Signature-Based Search for Delayed Photons in Exclusive Photon Plus Missing Transverse Energy Events from ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions with $\sqrt {s }$ = 1.96 TeV
CHATRCHYAN 2013AH
PL B722 273 Search for Long-Lived Particles Decaying to Photons and Missing Energy in Proton$−$Proton Collisions at $\sqrt {s }$ = 7 TeV
AAD 2012CT
JHEP 1212 124 Search for $\mathit R$-Parity-Violating Supersymmetry in Events with Four or More Leptons in $\sqrt {s }$ = 7 TeV ${{\mathit p}}{{\mathit p}}$ Collisions with the ATLAS Detector
AAD 2012R
PL B707 478 Search for Displaced Vertices Arising from Decays of New Heavy Particles in 7 TeV ${{\mathit p}}{{\mathit p}}$ Collisions at ATLAS
AAD 2012CP
PL B718 411 Search for Diphoton Events with Large Missing Transverse Momentum in 7 TeV Proton$−$Proton Collision Data with the ATLAS Detector
ABAZOV 2012AD
PR D86 071701 Search for ${{\mathit Z}}{{\mathit \gamma}}$ Events with Large Missing Transverse Energy in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
CHATRCHYAN 2012BK
JHEP 1211 172 Search for New Physics with Long-Lived Particles Decaying to Photons and Missing Energy in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV
CHATRCHYAN 2011B
JHEP 1106 093 Search for Supersymmetry in Events with a Lepton, a Photon, and Large Missing Transverse Energy in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV
AALTONEN 2010
PRL 104 011801 Search for Supersymmetry with Gauge-Mediated Breaking in Diphoton Events with Missing Transverse Energy at CDF II
ABAZOV 2010P
PRL 105 221802 Search for Diphoton Events with Large Missing Transverse Energy in 6.3 fb${}^{-1}$ of ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
ABAZOV 2008F
PL B659 856 Search for Supersymmetry in di-photon Final States at $\sqrt {s }$ = 1.96 TeV
ABULENCIA 2007H
PRL 98 131804 Search for Anomalous Production of Multilepton Events in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
ABBIENDI 2006B
EPJ C46 307 Searches for Gauge-Mediated Supersymmetry Breaking Topologies in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Collisions at Centre-of-Mass Energies up to $\sqrt {s }$ = 209 GeV
ABDALLAH 2005B
EPJ C38 395 Photon Events with Missing Energy in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Collisions at $\sqrt {s }$ = 130 to 209 GeV
PDG 2014
CP C38 070001 Review of Particle Physics 2014