The current constrains in the neutrino magnetic dipole moment and axion-electron coupling constant are tested by estimating the maximum increment in bolometric luminosity , induced by the anomalous energy sink during the tip-RGB , that can be achieved by stellar tracks without entering in contradiction with the current observational calibration for the tip-RGB from globular clusters covering \mathrm { -1.95 \leq [ M / H ] \leq + 0.04 } .
When each energy sink is introduced into stellar models separately , the evidence gathered from the 50 most populated clusters suggests \mathrm { \alpha _ { ae } \leq 0.5 \times 10 ^ { -26 } } and \mathrm { \mu _ { \nu } \leq 2.2 \times 10 ^ { -12 } \mu _ { B } } , while when they are assumed to occur simultaneously , these constraints are lowered down by 50 % and 25 % , respectively .