# ${{\widetilde{\boldsymbol t}}}$ (Stop) mass limit

Limits depend on the decay mode. In ${{\mathit e}^{+}}{{\mathit e}^{-}}$ collisions they also depend on the mixing angle of the mass eigenstate ${{\widetilde{\mathit t}}_{{1}}}$ = ${{\widetilde{\mathit t}}_{{L}}}$cos $\theta _{\mathit t}$ $+$ ${{\widetilde{\mathit t}}_{{R}}}$sin$\theta _{\mathit t}$. The coupling to the ${{\mathit Z}}$ vanishes when $\theta _{\mathit t}$ = $0.98$. In the Listings below, we use $\Delta \mathit m$ ${}\equiv$ ${\mathit m}_{{{\widetilde{\mathit t}}_{{1}}}}–{\mathit m}_{{{\widetilde{\mathit \chi}}_{{1}}^{0}}}$ or $\Delta \mathit m$ ${}\equiv$ ${\mathit m}_{{{\widetilde{\mathit t}}_{{1}}}}–{\mathit m}_{{{\widetilde{\mathit \nu}}}}$, depending on relevant decay mode. See also bounds in ${{\widetilde{\mathit q}}}~$(Squark) MASS LIMIT.''
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).

# R-parity violating ${{\widetilde{\boldsymbol t}}}$ (Stop) mass limit INSPIRE search

VALUE (GeV) CL% DOCUMENT ID TECN  COMMENT
$>1200$ 95 1
 2017 AI
ATLS RPV, ${}\geq{}$1 ${{\mathit \ell}}$ + ${}\geq{}$8 jets, Tstop1 with ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit t}}{{\mathit b}}{{\mathit s}}$ , ${{\mathit \lambda}_{{323}}^{''}}$ coupling, ${\mathit m}_{{{\widetilde{\mathit \chi}}_{{1}}^{0}}}$=500 GeV
$\text{none, 100 - 315}$ 95 2
 2016 AM
• • • We do not use the following data for averages, fits, limits, etc. • • •
$>890$ 95 3
 2016 AC
CMS ${{\mathit e}^{+}}{{\mathit e}^{-}}$ + ${}\geq{}$5 jets; ${{\widetilde{\mathit t}}}$ $\rightarrow$ ${{\mathit b}}{{\widetilde{\mathit \chi}}_{{1}}^{\pm}}$ ; ${{\widetilde{\mathit \chi}}_{{1}}^{\pm}}$ $\rightarrow$ ${{\mathit \ell}^{\pm}}$ ${{\mathit j}}{{\mathit j}}$ , RPV, ${{\mathit \lambda}_{{ijk}}^{\,'}}$
$> 1000$ 95 3
 2016 AC
CMS ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ + ${}\geq{}$5 jets; ${{\widetilde{\mathit t}}}$ $\rightarrow$ ${{\mathit b}}{{\widetilde{\mathit \chi}}_{{1}}^{\pm}}$ ; ${{\widetilde{\mathit \chi}}_{{1}}^{\pm}}$ $\rightarrow$ ${{\mathit \ell}^{\pm}}$ ${{\mathit j}}{{\mathit j}}$ , RPV, ${{\mathit \lambda}_{{ijk}}^{\,'}}$
$> 950$ 95 4
 2016 BX
CMS ${{\widetilde{\mathit t}}}$ $\rightarrow$ ${{\mathit t}}{{\widetilde{\mathit \chi}}_{{1}}^{0}}$ , ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit \ell}}{{\mathit \ell}}{{\mathit \nu}}$ , RPV, ${{\mathit \lambda}_{{121}}}$ or ${{\mathit \lambda}_{{122}}}{}\not=$0
$>790$ 95 5
 2015 E
CMS ${{\widetilde{\mathit t}}_{{1}}}$ $\rightarrow$ ${{\mathit b}}{{\mathit \ell}}$ , RPV, c$\tau$ = 2 cm
1  AABOUD 2017AI searched in 36.1 ${\mathrm {fb}}{}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 13 TeV for events with one or more isolated lepton, at least eight jets, either zero or many ${{\mathit b}}$-jets, for evidence of R-parity violating decays of the top squark. No significant excess above the Standard Model expectations is observed. Limits up to 1.25 (1.10) TeV are set on the top squark mass in R-parity-violating supersymmetry models where ${{\widetilde{\mathit t}}_{{1}}}$ decays for a bino LSP as: ${{\widetilde{\mathit t}}}$ $\rightarrow$ ${{\mathit t}}{{\widetilde{\mathit \chi}}_{{1}}^{0}}$ and for a higgsino LSP as ${{\widetilde{\mathit t}}}$ $\rightarrow$ ${{\mathit t}}{{\widetilde{\mathit \chi}}_{{1,2}}^{0}}$ / ${{\mathit b}}{{\widetilde{\mathit \chi}}_{{1}}^{+}}$ . These is followed by the decays through the non-zero ${{\mathit \lambda}_{{323}}^{''}}$ coupling ${{\widetilde{\mathit \chi}}_{{1,2}}^{0}}$ $\rightarrow$ ${{\mathit t}}{{\mathit b}}{{\mathit s}}$ , ${{\widetilde{\mathit \chi}}_{{1}}^{\pm}}$ $\rightarrow$ ${{\mathit b}}{{\mathit b}}{{\mathit s}}$ . See their Figure 10 and text for details on model assumptions.
2  AAD 2016AM searched in 17.4 ${\mathrm {fb}}{}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV for events containing two large-radius hadronic jets. No deviation from the background prediction is observed. Top squarks with masses between 100 and 315 GeV are excluded at 95$\%$ C.L. in the hypothesis that they both decay via ${{\mathit R}}$ -parity violating coupling ${{\mathit \lambda}_{{323}}^{"}}$ to ${{\mathit b}}$- and ${{\mathit s}}$-quarks. See their Fig. 10.
3  KHACHATRYAN 2016AC searched in 19.7 ${\mathrm {fb}}{}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV for events with low missing transverse momentum, two oppositely charged electrons or muons, and at least five jets, at least one of which is a ${{\mathit b}}$-jet, for evidence of R-parity violating, charging-mediated decays of the top squark. No significant excess above the Standard Model expectations is observed. Limits are set on the stop mass in R-parity-violating supersymmetry models where ${{\widetilde{\mathit t}}}$ $\rightarrow$ ${{\mathit b}}{{\widetilde{\mathit \chi}}_{{1}}^{\pm}}$ with ${{\widetilde{\mathit \chi}}_{{1}}^{\pm}}$ $\rightarrow$ ${{\mathit \ell}^{\pm}}{{\mathit j}}{{\mathit j}}$ , ${{\mathit \lambda}_{{ijk}}^{\,'}}$ ${}\not=$ 0 (${{\mathit i}},{{\mathit j}}$, ${{\mathit k}}{}\leq{}$ 2), and with ${\mathit m}_{{{\widetilde{\mathit t}}}}$ $−$ ${\mathit m}_{{{\widetilde{\mathit \chi}}_{{1}}^{\pm}}}$ = 100 GeV, see Fig. 3.
4  KHACHATRYAN 2016BX searched in 19.5 ${\mathrm {fb}}{}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV for events containing 4 leptons coming from R-parity-violating decays of ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit \ell}}{{\mathit \ell}}{{\mathit \nu}}$ with ${{\mathit \lambda}_{{121}}}{}\not=$ 0 or ${{\mathit \lambda}_{{122}}}{}\not=$ 0. No excess over the expected background is observed. Limits are derived on the gluino, squark and stop masses, see Fig. 23.
5  KHACHATRYAN 2015E searched for long-lived particles decaying to leptons in 19.7 ${\mathrm {fb}}{}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV. Events were selected with an electron and muon with opposite charges and each with transverse impact parameter values between 0.02 and 2 cm. Limits are set on SUSY benchmark models with pair production of top squarks decaying into an ${{\mathit e}}{{\mathit \mu}}$ final state via RPV interactions. See their Fig. 2
References:
 AABOUD 2017AI
JHEP 1709 088 Search for New Phenomena in a Lepton Plus High Jet Multiplicity Final State with the ATLAS Experiment using $\sqrt {s }$ = 13 TeV Proton-Proton Collision Data
JHEP 1606 067 A Search for Top squarks with R-parity-violating Decays to All-hadronic Final States with the ATLAS Detector in $\sqrt {s }$ = 8 TeV Proton-Proton Collisions
PL B760 178 Search for ${{\mathit R}}$ -Parity Violating Decays of a top squark in Proton-Proton Collisions at $\sqrt {s }$ = 8 TeV
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