Abstract
In R-parity-violating supersymmetry the lightest neutralino can be very light, even massless. For masses in the range $500$ MeV$\lesssim m_{\tilde\chi^0_1}\lesssim 4.5$ GeV the neutralino can be produced in hadron collisions from rare meson decays via an R-parity violating coupling, and subsequently decay to a lighter meson and a charged lepton. Due to the small neutralino mass and for small R-parity violating coupling the lightest neutralino is long-lived, leading to displaced vertices at fixed-target and collider experiments. In this work, we study such signatures at the proposed experiments ANUBIS and MAPP at the LHC. We also compare their sensitivity reach in these scenarios with that of other present and proposed experiments at the LHC such as ATLAS, CODEX-b, and MATHUSLA. We find that ANUBIS and MAPP can show complementary or superior sensitivity.
Highlights
There has been an increased interest in longlived particles (LLPs)
The azimuthal coverage is accounted for with the prefactor δφj=2π in Eq (18). Using this approximation for the location of the ANUBIS detector, and the probability for it to be hit by a particle flying from the interaction point (IP), we find a geometric coverage of the total solid angle of about 1.34%
We find that ANUBIS, MAPP1, and MAPP2 can all be sensitive to new parameter regions beyond the current RPV limits for sfermion masses of the order of
Summary
There has been an increased interest in longlived particles (LLPs). Such particles are defined at colliders to have detached vertices (DVs). We focus on the long-lived light neutralinos in RPV-SUSY, produced from a rare charm or bottom meson decay. We introduce the RPV-SUSY model, and discuss the production and decay of the lightest neutralinos via RPV couplings. LSPs are singly produced from either a charm or a bottom meson’s rare decay, and decay to a lighter meson with a displaced vertex to be reconstructed inside a detector Such light GeV-scale, or lighter, neutralinos are necessarily binolike to avoid existing bounds [12,13]. We assume for simplicity degenerate sfermion masses, and will compare the sensitivity of ANUBIS and MAPP in the parameter space of the RPV-SUSY with the current experimental bounds. Since these bounds are in general around 1 TeV, we will focus on two benchmark values of the degenerate sfermion masses, 1 and
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