LIMITS ON NEUTRAL PARTICLE PRODUCTION

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

INSPIRE   JSON  (beta) PDGID:
S015BD
VALUE DOCUMENT ID TECN  COMMENT
• • We do not use the following data for averages, fits, limits, etc. • •
1
ANDREEV
2024
NA64 mu + E(missing) search
2
ABRATENKO
2022A
 MCBN search for LLPs
3
ANDREEV
2022A
 NA64 new boson ${{\mathit X}}$ in ${{\mathit e}}$ ${{\mathit Z}}$ $\rightarrow$ ${{\mathit e}}{{\mathit Z}}{{\mathit X}}$
4
ANDREEV
2021
NA64 new boson ${{\mathit X}}$ in ${{\mathit e}}$ ${{\mathit Z}}$ $\rightarrow$ ${{\mathit e}}{{\mathit Z}}{{\mathit X}}$
5
LOSECCO
1981
CALO 28 GeV protons
1  ANDREEV 2024 search for ${{\mathit \mu}}$ $\rightarrow$ ${{\mathit \mu}}$ + E(missing). No signal observed. Limits placed on ${{\mathit Z}^{\,'}}$ models and DM models.
2  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.
3  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.
4  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.
5  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