Restudy on Dark Matter Time-Evolution in the Littlest Higgs Model with T-Parity

Following previous study,in the littlest Higgs model(LHM),the heavy photon is supposed to be a possibledark matter candidate and its relic abundance of the heavy photon is estimated in terms of the Boltzman-Lee-Weinbergtime-evolution equation.The effect of the T-parity violation is also considered.Our calculations show that when Higgsmass M_H taken to be 300 GeV and do not considering T-parity violation,only two narrow ranges 133<M_A_H<135 GeVand 167<M_A_H<169 GeV are tolerable with the current astrophysical observation and if 135<M_A_H<167 GeV,there must at least exist another species of heavy particle contributing to the cold dark matter.As long as the T-paritycan be violated,the heavy photon can decay into regular standard model particles and would affect the dark matterabundance in the universe,we discuss the constraint on the T-parity violation parameter based on the present data.Direct detection prospects are also discussed in some detail.

Following previous study, in the littlest Higgs model （LHM）, the heavy photon is supposed to be a possiL dark matter candidate and its relic abundance of the heavy photon is estimated in terms of the Boltzman- Lee-Weinba time-evolution equation. The effect of the T-parity violation is also considered. Our calculations show that when Higmass MH taken to be 300 GeV and do not considering T-parity violation, only two narrow ranges 133 〈 MAH 〈 135 Ge and 167 〈 MAH〈 169 GeV are tolerable with the current astrophysical observation and if 135 〈 MAH 〈 167 GeV there must at least exist another species of heavy particle contributing to the cold dark matter. As long as the T-pari; can be violated, the heavy photon can decay into regular standard model particles and would affect the dark matt abundance in the universe, we discuss the constraint on the T-parity violation parameter based on the present dat Direct detection prospects are also discussed in some detail.