<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>R</mml:mi></mml:math> -parity violation and light neutralinos at ANUBIS and MAPP

In $R$-parity-violating supersymmetry the lightest neutralino can be very light, even massless. For masses in range $500\text{ }\text{ }\mathrm{MeV}\ensuremath{\lesssim}{m}_{{\stackrel{\texttildelow{}}{\ensuremath{\chi}}}_{1}^{0}}\ensuremath{\lesssim}4.5\text{ }\mathrm{GeV}$ produced hadron collisions from rare meson decays via an coupling, and subsequently decay to a lighter charged lepton. Due small mass for coupling is long lived, leading displaced vertices at fixed-target collider experiments. this work, we study such signatures proposed experiments ANUBIS MoEDAL-MAPP LHC. We also compare their sensitivity reach these scenarios with that of other present LHC as ATLAS, CODEX-b, MATHUSLA. find MAPP show complementary or superior sensitivity.