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When we try to consider family gauge bosons with a lower energy scale, amajor obstacle is constraints from the observed $P^0$-$\bar{P}^0$ mixings($P^0=K^0, D^0, B^0,B^0_s$). Against such a conventional view, we point outthat, in a U(3) family gauge boson model, the bosons are harmless to any$P^0$-$\bar{P}^0$ mixings independently of explicit values of the familymixings, if masses $M_{ij}$ of the gauge bosons $A_i^{\ j}$ ($i,j$ are familyindexes) satisfy a relation $2/M_{ij}^2=1/M_{ii}^2 +1/M_{jj}^2$. If such thecase can be realized together with an inverted mass hierarchy $M_{33}^2 \llM_{22}^2 \ll M_{11}^2$, we can consider family gauge bosons with a considerablylower scale, so that we can expect rich signs for family gauge bosons in a TeVscale.

Phenomenology of Harmless Family Gauge Bosons to $K^0$-$\bar{K}^0$ Mixing