LIMITS ON NEUTRAL PARTICLE PRODUCTION

Production of New Penetrating Non-${{\mathit \nu}}$ Like States in Beam Dump

INSPIRE   PDGID:
S015BD
VALUE DOCUMENT ID TECN  COMMENT
• • We do not use the following data for averages, fits, limits, etc. • •
1
ABRATENKO
2022A
 MCBN search for LLPs
2
ANDREEV
2022A
 NA64 search for new boson ${{\mathit X}}$ in ${{\mathit e}}$ ${{\mathit Z}}$ $\rightarrow$ ${{\mathit e}}{{\mathit Z}}{{\mathit X}}$
3
ANDREEV
2021
NA64 search for new boson ${{\mathit X}}$ in ${{\mathit e}}$ ${{\mathit Z}}$ $\rightarrow$ ${{\mathit e}}{{\mathit Z}}{{\mathit X}}$
4
LOSECCO
1981
CALO 28 GeV protons
1  ABRATENKO 2022A search for LLPs from kaon decay in MicroBooNE absorber; no signal observed; limits placed for heavy neutral leptons (HNLs) and Higgs portal scalars (HPSs) in the MeV mass range.
2  ANDREEV 2022A search for new light B-L gauge boson ${{\mathit Z}^{\,'}}$ $\rightarrow$ ${{\mathit \nu}}{{\overline{\mathit \nu}}}$ in electron beam dump at NA64; no signal observed; limits set in m(${{\mathit Z}^{\,'}}$) vs coupling plane for m(${{\mathit Z}^{\,'}}$) $\sim{}$ $10^{-6} - 1$ GeV.
3  ANDREEV 2021 search for new invisibly decaying boson ${{\mathit X}}$ in ${{\mathit e}}$ ${{\mathit Z}}$ $\rightarrow$ ${{\mathit e}}{{\mathit Z}}{{\mathit X}}$ at NA64. No signal observed. Limits set in coupling vs. m(X) plane for m(X) $\sim{}$ $10^{-3}$ to 1 GeV.
4  No excess neutral-current events leads to ${\mathit \sigma (}$production${)}{\times }{\mathit \sigma (}$interaction${)}{\times }$acceptance $<2.26 \times 10^{-71}$ cm${}^{4}$/nucleon${}^{2}$ (CL = 90$\%$) for light neutrals. Acceptance depends on models (0.1 to $4. \times 10^{-4}$).
References:
ABRATENKO 2022A
PR D106 092006 Search for long-lived heavy neutral leptons and Higgs portal scalars decaying in the MicroBooNE detector
ANDREEV 2022A
PRL 129 161801 Search for a New B-L Z? Gauge Boson with the NA64 Experiment at CERN
ANDREEV 2021
PRL 126 211802 Constraints on New Physics in Electron $g-2$ from a Search for Invisible Decays of a Scalar, Pseudoscalar, Vector, and Axial Vector
LOSECCO 1981
PL 102B 209 Limits on the Production of Neutral Penetrating States in a Beam Dump