Charged sleptons

This section contains limits on charged scalar leptons (${{\widetilde{\mathit \ell}}}$, with ${{\mathit \ell}}={{\mathit e}},{{\mathit \mu}},{{\mathit \tau}}$). Studies of width and decays of the ${{\mathit Z}}$ boson (use is made here of $\Delta \Gamma _{{\mathrm {inv}}}<2.0~$MeV, LEP 2000 ) conclusively rule out ${\mathit m}_{{{\widetilde{\mathit \ell}}_{{R}}}}<40~$GeV (41 GeV for ${{\widetilde{\mathit \ell}}_{{L}}}$) , independently of decay modes, for each individual slepton. The limits improve to 43$~$GeV ($43.5$ GeV for ${{\widetilde{\mathit \ell}}_{{L}}}$) assuming all 3 flavors to be degenerate. Limits on higher mass sleptons depend on model assumptions and on the mass splitting $\Delta \mathit m$= ${\mathit m}_{{{\widetilde{\mathit \ell}}}}–{\mathit m}_{{{\widetilde{\mathit \chi}}_{{1}}^{0}}}$. The mass and composition of ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ may affect the selectron production rate in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ collisions through ${{\mathit t}}$-channel exchange diagrams. Production rates are also affected by the potentially large mixing angle of the lightest mass eigenstate ${{\widetilde{\mathit \ell}}_{{1}}}={{\widetilde{\mathit \ell}}_{{R}}}$ sin$\theta _{{{\mathit \ell}}}$ + ${{\widetilde{\mathit \ell}}_{{L}}}$ cos $\theta _{{{\mathit \ell}}}$. It is generally assumed that only ${{\widetilde{\mathit \tau}}}$ may have significant mixing. The coupling to the ${{\mathit Z}}$ vanishes for $\theta _{{{\mathit \ell}}}$=0.82. In the high-energy limit of ${{\mathit e}^{+}}{{\mathit e}^{-}}$ collisions the interference between ${{\mathit \gamma}}$ and ${{\mathit Z}}$ exchange leads to a minimal cross section for $\theta _{{{\mathit \ell}}}$=0.91, a value which is sometimes used in the following entries relative to data taken at LEP2. When limits on ${\mathit m}_{{{\widetilde{\mathit \ell}}_{{R}}}}$ are quoted, it is understood that limits on ${\mathit m}_{{{\widetilde{\mathit \ell}}_{{L}}}}$ are usually at least as strong.
Possibly open decays involving gauginos other than ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ will affect the detection efficiencies. Unless otherwise stated, the limits presented here result from the study of ${{\widetilde{\mathit \ell}}^{+}}{{\widetilde{\mathit \ell}}^{-}}$ production, with production rates and decay properties derived from the MSSM. Limits made obsolete by the recent analyses of ${{\mathit e}^{+}}{{\mathit e}^{-}}$ collisions at high energies can be found in previous Editions of this Review.
For decays with final state gravitinos (${{\widetilde{\mathit G}}}$), ${\mathit m}_{{{\widetilde{\mathit G}}}}$ is assumed to be negligible relative to all other masses.

R-partiy violating ${{\widetilde{\boldsymbol e}}}$ (Selectron) mass limit INSPIRE search

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) (

$\bf{> 410}$ 95 1
ATLS RPV, ${}\geq{}4{{\mathit \ell}^{\pm}}$, ${{\widetilde{\mathit \ell}}}$ $\rightarrow$ ${{\mathit l}}{{\widetilde{\mathit \chi}}_{{1}}^{0}}$ , ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit \ell}^{\pm}}{{\mathit \ell}^{\mp}}{{\mathit \nu}}$
• • • We do not use the following data for averages, fits, limits, etc. • • •
$> 89$ 95 2
OPAL RPV, ${{\widetilde{\mathit e}}_{{L}}}$
$> 92$ 95 3
DLPH RPV, ${{\widetilde{\mathit e}}_{{R}}}$, indirect, $\Delta \mathit m>$5~GeV
1  AAD 2014X searched in 20.3 fb${}^{-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 slepton mass in an R-parity violating simplified model where the decay ${{\widetilde{\mathit \ell}}}$ $\rightarrow$ ${{\mathit \ell}}{{\widetilde{\mathit \chi}}_{{1}}^{0}}$ , 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.
2  ABBIENDI 2004F use data from $\sqrt {s }$ = $189 - 209$~GeV. They derive limits on sparticle masses under the assumption of RPV with ${{\mathit L}}{{\mathit L}}{{\overline{\mathit E}}}$ or ${{\mathit L}}{{\mathit Q}}{{\overline{\mathit D}}}$ couplings. The results are valid for tan ${{\mathit \beta}}$ = 1.5, ${{\mathit \mu}}$ = $-200$~GeV, with, in addition, $\Delta \mathit m$ $>$ 5~GeV for indirect decays via ${{\mathit L}}{{\mathit Q}}{{\overline{\mathit D}}}$ . The limit quoted applies to direct decays via ${{\mathit L}}{{\mathit L}}{{\overline{\mathit E}}}$ or ${{\mathit L}}{{\mathit Q}}{{\overline{\mathit D}}}$ couplings. For indirect decays, the limits on the ${{\widetilde{\mathit e}}_{{R}}}$ mass are respectively 99 and 92~GeV for ${{\mathit L}}{{\mathit L}}{{\overline{\mathit E}}}$ and ${{\mathit L}}{{\mathit Q}}{{\overline{\mathit D}}}$ couplings and ${\mathit m}_{{{\widetilde{\mathit \chi}}^{0}}}$ = 10~GeV and degrade slightly for larger ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ mass. Supersedes the results of ABBIENDI 2000 .
3  ABDALLAH 2004M use data from $\sqrt {s }$ = $192 - 208$~GeV to derive limits on sparticle masses under the assumption of RPV with ${{\mathit L}}{{\mathit L}}{{\overline{\mathit E}}}$ or ${{\overline{\mathit U}}}{{\overline{\mathit D}}}{{\overline{\mathit D}}}$ couplings. The results are valid for ${{\mathit \mu}}$ = $-200$~GeV, tan ${{\mathit \beta}}$ = 1.5, $\Delta \mathit m$ $>$ 5~GeV and assuming a BR of 1 for the given decay. The limit quoted is for indirect ${{\overline{\mathit U}}}{{\overline{\mathit D}}}{{\overline{\mathit D}}}$ decays using the neutralino constraint of 39.5 GeV for ${{\mathit L}}{{\mathit L}}{{\overline{\mathit E}}}$ and of 38.0 GeV for ${{\overline{\mathit U}}}{{\overline{\mathit D}}}{{\overline{\mathit D}}}$ couplings, also derived in ABDALLAH 2004M. For indirect decays via ${{\mathit L}}{{\mathit L}}{{\overline{\mathit E}}}$ the limit improves to 95 GeV if the constraint from the neutralino is used and to 94 GeV if it is not used. For indirect decays via ${{\overline{\mathit U}}}{{\overline{\mathit D}}}{{\overline{\mathit D}}}$ couplings it remains unchanged when the neutralino constraint is not used. Supersedes the result of ABREU 2000U.
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
EPJ C33 149 Search for $\mathit R$-Parity Violating Decays of Scalar Fermions at LEP
EPJ C36 1 Search for Supersymmetric Particles Assuming $\mathit R$-Parity non-conservation in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Collisions at $\sqrt {s }$ = 192 to 208 GeV
PL B487 36 Search for SUSY with $\mathit R$-Parity Violating LL${{\overline{\mathit E}}}$ Couplings at $\sqrt {s }$ = 189 GeV
EPJ C14 187 Search for Chargino and Neutralino Production at $\sqrt {s }$ = 189 GeV at LEP
PDG 2014
CP C38 070001 Review of Particle Physics 2014