${{\widetilde{\boldsymbol \nu}}}$ (Sneutrino) mass limit INSPIRE search

The limits may depend on the number, $\mathit N({{\widetilde{\mathit \nu}}}$), of sneutrinos assumed to be degenerate in mass. Only ${{\widetilde{\mathit \nu}}_{{L}}}$ (not ${{\widetilde{\mathit \nu}}_{{R}}}$) is assumed to exist. It is possible that ${{\widetilde{\mathit \nu}}}$ could be the lightest supersymmetric particle (LSP).

We report here, but do not include in the Listings, the limits obtained from the fit of the final results obtained by the LEP Collaborations on the invisible width of the ${{\mathit Z}}~$boson ($\Delta \Gamma _{{\mathrm {inv.}}}<2.0$ MeV, LEP-SLC 2006 ): ${\mathit m}_{{{\widetilde{\mathit \nu}}}}>43.7$ GeV ($\mathit N({{\widetilde{\mathit \nu}}}$)=1) and ${\mathit m}_{{{\widetilde{\mathit \nu}}}}>44.7$ GeV ($\mathit N({{\widetilde{\mathit \nu}}}$)=3) .

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
$\bf{> 2300}$ 95 1
AABOUD
2016P
ATLS RPV, ${{\widetilde{\mathit \nu}}_{{\tau}}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \mu}}$ , ${{\mathit \lambda}_{{311}}^{\,'}}$ = 0.11
$> 2200$ 95 1
AABOUD
2016P
ATLS RPV, ${{\widetilde{\mathit \nu}}_{{\tau}}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \tau}}$ , ${{\mathit \lambda}_{{311}}^{\,'}}$ = 0.11
$>1900$ 95 1
AABOUD
2016P
ATLS RPV, ${{\widetilde{\mathit \nu}}_{{\tau}}}$ $\rightarrow$ ${{\mathit \mu}}{{\mathit \tau}}$ , ${{\mathit \lambda}_{{311}}^{\,'}}$ = 0.11
$> 400$ 95 2
AAD
2014X
ATLS RPV, ${}\geq{}4{{\mathit \ell}^{\pm}}$, ${{\widetilde{\mathit \nu}}}$ $\rightarrow$ ${{\mathit \nu}}{{\widetilde{\mathit \chi}}_{{1}}^{0}}$ , ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit \ell}^{\pm}}{{\mathit \ell}^{\mp}}{{\mathit \nu}}$
3
AAD
2011Z
ATLS RPV, ${{\widetilde{\mathit \nu}}_{{\tau}}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \mu}}$
$\bf{>94}$ 95 4
ABDALLAH
2003M
DLPH 1${}\leq{}$tan $\beta {}\leq{}$40, ${\mathit m}_{{{\widetilde{\mathit e}}_{{R}}}}\text{-}{\mathit m}_{{{\widetilde{\mathit \chi}}_{{1}}^{0}}}>$10~GeV
$>84$ 95 5
HEISTER
2002N
ALEP ${{\widetilde{\mathit \nu}}_{{e}}}$, any $\Delta \mathit m$
$\bf{>41}$ 95 6
DECAMP
1992
ALEP $\Gamma\mathrm {( {{\mathit Z}} \rightarrow invisible)}$; $\mathit N({{\widetilde{\mathit \nu}}}$)=3, model independent
• • • We do not use the following data for averages, fits, limits, etc. • • •
$> 1280$ 95 7
KHACHATRYAN
2016BE
CMS RPV, ${{\widetilde{\mathit \nu}}_{{\tau}}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \mu}}$ , ${{\mathit \lambda}_{{132}}}$ = ${{\mathit \lambda}_{{231}}}$ = ${{\mathit \lambda}_{{311}}^{\,'}}$ = 0.01
$> 2300$ 95 7
KHACHATRYAN
2016BE
CMS RPV, ${{\widetilde{\mathit \nu}}_{{\tau}}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \mu}}$ , ${{\mathit \lambda}_{{132}}}$ = ${{\mathit \lambda}_{{231}}}$ = 0.07, ${{\mathit \lambda}_{{311}}^{\,'}}$ = 0.11
$>2000$ 95 8
AAD
2015O
ATLS RPV ( ${{\mathit e}}{{\mathit \mu}}$ ), ${{\widetilde{\mathit \nu}}_{{\tau}}}$, $\lambda {}^{'}_{311}$ = 0.11, $\lambda _{i3k}$ = 0.07
$>1700$ 95 8
AAD
2015O
ATLS RPV ( ${{\mathit \tau}}{{\mathit \mu}}$ , ${{\mathit e}}{{\mathit \tau}}$ ), ${{\widetilde{\mathit \nu}}_{{\tau}}}$, $\lambda {}^{'}_{311}$ = 0.11, $\lambda _{i3k}$ = 0.07
9
AAD
2013AI
ATLS RPV, ${{\widetilde{\mathit \nu}}_{{\tau}}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \mu}}$ , ${{\mathit e}}{{\mathit \tau}}$ , ${{\mathit \mu}}{{\mathit \tau}}$
10
AAD
2011H
ATLS RPV, ${{\widetilde{\mathit \nu}}_{{\tau}}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \mu}}$
11
AALTONEN
2010Z
CDF RPV, ${{\widetilde{\mathit \nu}}_{{\tau}}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \mu}}$ , ${{\mathit e}}{{\mathit \tau}}$ , ${{\mathit \mu}}{{\mathit \tau}}$
12
ABAZOV
2010M
D0 RPV, ${{\widetilde{\mathit \nu}}_{{\tau}}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \mu}}$
$> 95$ 95 13
ABDALLAH
2004H
DLPH AMSB, ${{\mathit \mu}}$ $>$ 0
$>37.1$ 95 14
ADRIANI
1993M
L3 $\Gamma\mathrm {( {{\mathit Z}} \rightarrow invisible)}$; $\mathit N({{\widetilde{\mathit \nu}}}$)=1
$>36$ 95
ABREU
1991F
DLPH $\Gamma\mathrm {( {{\mathit Z}} \rightarrow invisible)}$; $\mathit N({{\widetilde{\mathit \nu}}}$)=1
$>31.2$ 95 15
ALEXANDER
1991F
OPAL $\Gamma\mathrm {( {{\mathit Z}} \rightarrow invisible)}$; $\mathit N({{\widetilde{\mathit \nu}}}$)=1
1  AABOUD 2016P searched in 3.2 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 13 TeV for events with different flavour dilepton pairs ( ${{\mathit e}}{{\mathit \mu}}$ , ${{\mathit e}}{{\mathit \tau}}$ , ${{\mathit \mu}}{{\mathit \tau}}$ ) from the production of ${{\widetilde{\mathit \nu}}_{{\tau}}}$ via an RPV ${{\mathit \lambda}_{{311}}^{\,'}}$ coupling and followed by a decay via ${{\mathit \lambda}_{{312}}}$ = ${{\mathit \lambda}_{{321}}}$ = 0.07 for ${{\mathit e}}{+}$ ${{\mathit \mu}}$ , via ${{\mathit \lambda}_{{313}}}$ = ${{\mathit \lambda}_{{331}}}$ = 0.07 for ${{\mathit e}}{+}$ ${{\mathit \tau}}$ and via ${{\mathit \lambda}_{{323}}}$ = ${{\mathit \lambda}_{{332}}}$ = 0.07 for ${{\mathit \mu}}{+}$ ${{\mathit \tau}}$ . No evidence for a dilepton resonance over the SM expectation is observed, and limits are derived on ${\mathit m}_{{{\widetilde{\mathit \nu}}}}$ at 95$\%$ CL, see their Figs. 2(b), 3(b), 4(b), and Table 3.
2  AAD 2014X searched in 20.3 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV for events with at least four leptons (electrons, muons, taus) in the final state. No significant excess above the Standard Model expectations is observed. Limits are set on the sneutrino mass in an R-parity violating simplified model where the decay ${{\widetilde{\mathit \nu}}}$ $\rightarrow$ ${{\mathit \nu}}{{\widetilde{\mathit \chi}}_{{1}}^{0}}$ , with ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit \ell}^{\pm}}{{\mathit \ell}^{\mp}}{{\mathit \nu}}$ , takes place with a branching ratio of 100$\%$, see Fig. 9.
3  AAD 2011Z looked in 1.07 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 7 TeV for events with one electron and one muon of opposite charge from the production of ${{\widetilde{\mathit \nu}}_{{\tau}}}$ via an RPV ${{\mathit \lambda}^{\,'}}_{311}$ coupling and followed by a decay via ${{\mathit \lambda}}_{312}$ into ${{\mathit e}}{+}$ ${{\mathit \mu}}$ . No evidence for an (${{\mathit e}}$, ${{\mathit \mu}}$) resonance over the SM expectation is observed, and a limit is derived in the plane of ${{\mathit \lambda}^{\,'}}_{311}$ versus ${\mathit m}_{{{\widetilde{\mathit \nu}}}}$ for three values of ${{\mathit \lambda}}_{312}$, see their Fig. 2. Masses ${\mathit m}_{{{\widetilde{\mathit \nu}}}}$ $<$ 1.32 (1.45) TeV are excluded for ${{\mathit \lambda}^{\,'}}_{311}$ = 0.10 and ${{\mathit \lambda}}_{312}$ = 0.05 (${{\mathit \lambda}^{\,'}}_{311}$ = 0.11 and ${{\mathit \lambda}}_{312}$ = 0.07).
4  ABDALLAH 2003M uses data from $\sqrt {s }$ = $192 - 208$ GeV to obtain limits in the framework of the MSSM with gaugino and sfermion mass universality at the GUT scale. An indirect limit on the mass is derived by constraining the MSSM parameter space by the results from direct searches for neutralinos (including cascade decays) and for sleptons. These limits are valid for values of M$_{2}<$ 1 TeV, $\vert {{\mathit \mu}}\vert {}\leq{}$1 TeV with the ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ as LSP. The quoted limit is obtained when there is no mixing in the third family. See Fig.~43 for the mass limits as a function of tan $\beta $. These limits update the results of ABREU 2000W.
5  HEISTER 2002N derives a bound on ${\mathit m}_{{{\widetilde{\mathit \nu}}_{{e}}}}$ by exploiting the mass relation between the ${{\widetilde{\mathit \nu}}_{{e}}}$ and ${{\widetilde{\mathit e}}}$, based on the assumption of universal GUT scale gaugino and scalar masses $\mathit m_{1/2}$ and $\mathit m_{0}$ and the search described in the ${{\widetilde{\mathit e}}}$ section. In the MSUGRA framework with radiative electroweak symmetry breaking, the limit improves to ${\mathit m}_{{{\widetilde{\mathit \nu}}_{{e}}}}>$130 GeV, assuming a trilinear coupling $\mathit A_{0}$=0 at the GUT scale. See Figs.$~$5 and 7 for the dependence of the limits on tan $\beta $.
6  DECAMP 1992 limit is from $\Gamma\mathrm {({\mathrm {invisible}})}/\Gamma\mathrm {( {{\mathit \ell}} {{\mathit \ell}} )}$ = $5.91$ $\pm0.15$ ($\mathit N_{{{\mathit \nu}}}$ = $2.97$ $\pm0.07$).
7  KHACHATRYAN 2016BE searched in 19.7 ${\mathrm {fb}}{}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV for evidence of narrow resonances decaying into ${{\mathit e}}{{\mathit \mu}}$ final states. No significant excess above the Standard Model expectation is observed and 95$\%$ C.L. exclusions are placed on the cross section times branching ratio for the production of an R-parity-violating supersymmetric tau sneutrino, see their Fig. 3.
8  AAD 2015O searched in 20.3 ${\mathrm {fb}}{}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV for evidence of heavy particles decaying into ${{\mathit e}}{{\mathit \mu}}$ , ${{\mathit e}}{{\mathit \tau}}$ or ${{\mathit \mu}}{{\mathit \tau}}$ final states. No significant excess above the Standard Model expectation is observed, and 95$\%$ C.L. exclusions are placed on the cross section times branching ratio for the production of an $\mathit R$-parity-violating supersymmetric tau sneutrino, applicable to any sneutrino flavour, see their Fig. 2.
9  AAD 2013AI searched in 4.6 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 7 TeV for evidence of heavy particles decaying into ${{\mathit e}}{{\mathit \mu}}$ , ${{\mathit e}}{{\mathit \tau}}$ or ${{\mathit \mu}}{{\mathit \tau}}$ final states. No significant excess above the Standard Model expectation is observed, and 95$\%$ C.L. exclusions are placed on the cross section times branching ratio for the production of an R-parity-violating supersymmetric tau sneutrino, see their Fig. 2. For couplings ${{\mathit \lambda}^{\,'}}_{311}$ = 0.10 and ${{\mathit \lambda}_{{i3k}}}$ = 0.05, the lower limits on the ${{\widetilde{\mathit \nu}}_{{\tau}}}$ mass are 1610, 1110, 1100 GeV in the ${{\mathit e}}{{\mathit \mu}}$ , ${{\mathit e}}{{\mathit \tau}}$ , and ${{\mathit \mu}}{{\mathit \tau}}$ channels, respectively.
10  AAD 2011H looked in 35 pb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 7 TeV for events with one electron and one muon of opposite charge from the production of ${{\widetilde{\mathit \nu}}_{{\tau}}}$ via an RPV ${{\mathit \lambda}^{\,'}}_{311}$ coupling and followed by a decay via ${{\mathit \lambda}}_{312}$ into ${{\mathit e}}{+}$ ${{\mathit \mu}}$ . No evidence for an excess over the SM expectation is observed, and a limit is derived in the plane of ${{\mathit \lambda}^{\,'}}_{311}$ versus ${\mathit m}_{{{\widetilde{\mathit \nu}}}}$ for several values of ${{\mathit \lambda}}_{312}$, see their Fig. 2. Superseded by AAD 2011Z.
11  AALTONEN 2010Z searched in 1 fb${}^{-1}$ of ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\sqrt {s }$ = 1.96 TeV for events from the production ${{\mathit d}}$ ${{\overline{\mathit d}}}$ $\rightarrow$ ${{\widetilde{\mathit \nu}}_{{\tau}}}$ with the subsequent decays ${{\widetilde{\mathit \nu}}_{{\tau}}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \mu}}$ , ${{\mathit \mu}}{{\mathit \tau}}$ , ${{\mathit e}}{{\mathit \tau}}$ in the MSSM framework with RPV. Two isolated leptons of different flavor and opposite charges are required, with ${{\mathit \tau}}$s identified by their hadronic decay. No statistically significant excesses are observed over the SM background. Upper limits on ${{\mathit \lambda}_{{311}}^{'2}}$ times the branching ratio are listed in their Table III for various ${{\widetilde{\mathit \nu}}_{{\tau}}}$ masses. Limits on the cross section times branching ratio for ${{\mathit \lambda}_{{311}}^{\,'}}$ = 0.10 and ${{\mathit \lambda}_{{i3k}}}$ = 0.05, displayed in Fig. 2, are used to set limits on the ${{\widetilde{\mathit \nu}}_{{\tau}}}$ mass of 558 GeV for the ${{\mathit e}}{{\mathit \mu}}$ , 441 GeV for the ${{\mathit \mu}}{{\mathit \tau}}$ and 442 GeV for the ${{\mathit e}}{{\mathit \tau}}$ channels.
12  ABAZOV 2010M looked in 5.3 fb${}^{-1}$ of ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\sqrt {s }$ = 1.96 TeV for events with exactly one pair of high ${{\mathit p}_{{T}}}$ isolated ${{\mathit e}}{{\mathit \mu}}$ and a veto against hard jets. No evidence for an excess over the SM expectation is observed, and a limit at 95$\%$ C.L. on the cross section times branching ratio is derived, see their Fig. 3. These limits are translated into limits on couplings as a function of ${\mathit m}_{{{\widetilde{\mathit \nu}}_{{\tau}}}}$ as shown on their Fig. 4. As an example, for ${\mathit m}_{{{\widetilde{\mathit \nu}}_{{\tau}}}}$ = 100 GeV and ${{\mathit \lambda}_{{312}}}{}\leq{}$ 0.07, couplings ${{\mathit \lambda}_{{311}}^{\,'}}$ $>$ $7.7 \times 10^{-4}$ are excluded.
13  ABDALLAH 2004H use data from LEP~1 and $\sqrt {s }$ = $192 - 208$~GeV. They re-use results or re-analyze the data from ABDALLAH 2003M to put limits on the parameter space of anomaly-mediated supersymmetry breaking (AMSB), which is scanned in the region 1$<{{\mathit m}}_{3/2}<$50~TeV, 0$<{{\mathit m}_{{0}}}<$1000~GeV, 1.5$<$tan ${{\mathit \beta}}<$35, both signs of ${{\mathit \mu}}$. The constraints are obtained from the searches for mass degenerate chargino and neutralino, for SM-like and invisible Higgs, for leptonically decaying charginos and from the limit on non-SM ${{\mathit Z}}$ width of 3.2~MeV. The limit is for ${\mathit m}_{{{\mathit t}}}$ = 174.3~GeV (see Table 2 for other ${\mathit m}_{{{\mathit t}}}$ values). The limit improves to 114 GeV for ${{\mathit \mu}}$ $<$ 0.
14  ADRIANI 1993M limit from $\Delta \Gamma\mathrm {({{\mathit Z}})}$(invisible)$<16.2$ MeV.
15  ALEXANDER 1991F limit is for one species of ${{\widetilde{\mathit \nu}}}$ and is derived from $\Gamma $(invisible, new)$/\Gamma\mathrm {( {{\mathit \ell}} {{\mathit \ell}} )}$ $<~0.38$.
  References:
AABOUD 2016P
EPJ C76 541 Search for New Phenomena in Different-Flavour high-Mass Dilepton Final States in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 13 Tev with the ATLAS Detector
KHACHATRYAN 2016BE
EPJ C76 317 Search for Lepton Flavour Violating Decays of Heavy Resonances and Quantum Black Holes to an ${{\mathit e}}{{\mathit \mu}}$ Pair in Proton-Proton Collisions at $\sqrt {s }$ = 8 TeV
AAD 2015O
PRL 115 031801 Search for a Heavy Neutral Particle Decaying to ${{\mathit e}}{{\mathit \mu}}$, ${{\mathit e}}{{\mathit \tau}}$, or ${{\mathit \mu}}{{\mathit \tau}}$ in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV with the ATLAS Detector
AAD 2014X
PR D90 052001 Search for Supersymmetry in Events with Four or More Leptons in $\sqrt {s }$ = 8 TeV ${{\mathit p}}{{\mathit p}}$ Collisions with the ATLAS Detector
AAD 2013AI
PL B723 15 Search for a Heavy Narrow Resonance Decaying to ${{\mathit e}}{{\mathit \mu}}$, ${{\mathit e}}{{\mathit \tau}}$, or ${{\mathit \mu}}{{\mathit \tau}}$ with the ATLAS Detector in $\sqrt {s }$ = 7 TeV ${{\mathit p}}{{\mathit p}}$ Collisions at the LHC
AAD 2011H
PRL 106 251801 Search for a Heavy Particle Decaying into an Electron and a Muon with the ATLAS Detector in $\sqrt {s }$ = 7 TeV ${{\mathit p}}{{\mathit p}}$ collisions at the LHC.
AAD 2011Z
EPJ C71 1809 Search for a Heavy Neutral Particle Decaying into an Electron and a Muon using 1 fb${}^{-1}$ of ATLAS Data
AALTONEN 2010Z
PRL 105 191801 Search for $\mathit R$-Parity Violating Decays of Sneutrinos to ${{\mathit e}}{{\mathit \mu}}$, ${{\mathit \mu}}{{\mathit \tau}}$, and ${{\mathit e}}{{\mathit \tau}}$ Pairs in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
ABAZOV 2010M
PRL 105 191802 Search for Sneutrino Production in ${{\mathit e}}{{\mathit \mu}}$ Final States in 5.3 fb${}^{-1}$ of ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
ABDALLAH 2004H
EPJ C34 145 Search for SUSY in the AMSB Scenario with the DELPHI Detector
ABDALLAH 2003M
EPJ C31 421 Searches for Supersymmetric Particles in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Collisions up to 208 GeV and Interpretation of the Results within the MSSM
HEISTER 2002N
PL B544 73 Absolute Lower Limits on the Masses of Selectrons and Sneutrinos in the MSSM
ADRIANI 1993M
PRPL 236 1 Results from the L3 Experiment at LEP
DECAMP 1992
PRPL 216 253 Searches for New Particles in ${{\mathit Z}}$ Decays using the ALEPH Detector
ABREU 1991F
NP B367 511 Determination of ${{\mathit Z}^{0}}$ Resonance Parameters and Couplings from its Hadronic and Leptonic Decays
ALEXANDER 1991F
ZPHY C52 175 Measurement of the ${{\mathit Z}^{0}}$ Line Shape Parameters and the Electroweak Couplings of Charged Leptons
ABREU 2000W
PL B489 38 Limits on the Masses of Supersymmetric Particles at $\sqrt {s }$ = 189-GeV