Constraints on light dark matter and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>U</mml:mi></mml:math>bosons, from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ψ</mml:mi></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Υ</mml:mi></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>K</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:…
Constraints on light dark matter and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>U</mml:mi></mml:math>bosons, from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ψ</mml:mi></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Υ</mml:mi></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>K</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:…
Following searches for photinos and very light gravitinos in invisible decays of $\ensuremath{\psi}$ and $\ensuremath{\Upsilon}$, we discuss new limits on Light Dark Matter and $U$ bosons, from $\ensuremath{\psi}$ and $\ensuremath{\Upsilon}$ decays, as well as rare decays of ${K}^{+}$ and invisible decays of $\ensuremath{\pi}\ifmmode^\circ\else\textdegree\fi{}$, $\ensuremath{\eta}$ and ${\ensuremath{\eta}}^{\ensuremath{'}}\dots{}$. The new limits involving …