Neutral Detector (ND) is a detector for particle physics experiments created by the team of physicists in the Budker Institute of Nuclear Physics, Novosibirsk, Russia. Experiments with the ND were conducted from 1982 to 1987 at the e+e− storage ring VEPP-2M in the energy range 2E = 0.5 to 1.4 GeV.
Physics At the beginning of 80s the leading cross sections of the electron-positron annihilation in the final states with charged particles were measured in the energy range 2E=0.5-1.4 GeV. Processes with the neutral particles in the final state were less studied. To investigate the radiative decays of the ρ 0 {\displaystyle \rho ^{0}} , ω {\displaystyle \omega } , and ϕ {\displaystyle \phi } mesons and other processes involving photons, π 0 {\displaystyle \pi ^{0}} , and η {\displaystyle \eta } mesons the ND
was constructed. Its distinguishing features are defined by the specially designed electromagnetic calorimeter based on NaI(Tl) scintillation counters. List of published analyses
Radiative decays
e + e − → ρ , ω , ϕ → π 0 γ , η γ {\displaystyle e^{+}e^{-}\to \rho ,\omega ,\phi \to \pi ^{0}\gamma ,\eta \gamma }
ϕ → η ′ γ {\displaystyle \phi \to \eta ^{\prime }\gamma } Rare decays of the ρ 0 {\displaystyle \rho ^{0}} , ω {\displaystyle \omega } , and ϕ {\displaystyle \phi } mesons
ω , ϕ → π 0 e + e − {\displaystyle \omega ,\phi \to \pi ^{0}e^{+}e^{-}}
ϕ → π + π − {\displaystyle \phi \to \pi ^{+}\pi ^{-}} Search for rare decays
ρ → π + π − π 0 {\displaystyle \rho \to \pi ^{+}\pi ^{-}\pi ^{0}}
ω , ϕ → π 0 π 0 γ {\displaystyle \omega ,\phi \to \pi ^{0}\pi ^{0}\gamma }
ϕ → π 0 η γ {\displaystyle \phi \to \pi ^{0}\eta \gamma } light scalars a 0 ( 980 ) {\displaystyle a_{0}(980)} and f 0 ( 975 ) {\displaystyle f_{0}(975)} in ϕ {\displaystyle \phi } -meson radiative decays Non-resonant electron-positron annihilation into hadrons
e + e − → ω π 0 {\displaystyle e^{+}e^{-}\to \omega \pi ^{0}}
e + e − → π + π − π 0 , π + π − η {\displaystyle e^{+}e^{-}\to \pi ^{+}\pi ^{-}\pi ^{0},~~\pi ^{+}\pi ^{-}\eta }
e + e − → π + π − π + π − , π + π − π 0 π 0 {\displaystyle e^{+}e^{-}\to \pi ^{+}\pi ^{-}\pi ^{+}\pi ^{-},~~\pi ^{+}\pi ^{-}\pi ^{0}\pi ^{0}} Test of QED processes
e + e − → γ γ γ γ {\displaystyle e^{+}e^{-}\to \gamma \gamma \gamma \gamma }
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