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The collision-induced shift and broadening of selected dipole transitionlines of pionic helium in gaseous helium at low temperatures up to $T=12$ K andpressure up to a few bar are calculated within variable phase functionapproach. We predict blue shift of the resonance frequencies of the$(n,l)=(16,15) \rightarrow (16,14) $ and $(16,15) \rightarrow (17,14)$unfavored transitions and red shift for the favored transition $(17,16)\rightarrow (16,15)$. The result may be helpful in reducing the systematicerror in proposed future experiments for determination of the negativelycharged pion mass from laser spectroscopy of metastable pionic helium atoms.

Systematic effects in the measurement of the negatively charged pion mass using laser spectroscopy of pionic helium atoms