HIC for FAIR logo Nuclear Physics Colloquium

Location: Institute for Theoretical Physics, Physics Building, Seminar Room PHYS 2.116
Time: Thursday, November 27, 4:30-5:30pm (s.t.)
(plus 10min for discussion)
Contact: hees@fias.uni-frankfurt.de


Dilepton production in pion induced reactions

Gyorgy Wolf (Wigner Research Center Budapest)

 
We calculate dilepton pair production in pion-nucleon and pion-nucleus  collisions. We derive the elementary cross sections in an effective field theory approach. We use these cross sections in a transport model to study $\pi$-nucleus reactions.  We investigate especially what is the effect of the of the interference term (which is destructive in $\pi^+$n and constructive in $\pi^-$p collisions) of the $\rho$ and $\omega$ mesons on the dilepton spectra in $\pi^+$A and $\pi^-$A collisions. Our preliminary results predict a substantial, experimentally measurable change of the cross sections ratios of $\pi^+$ and $\pi^-$ induced reactions when we go from nucleon targets to heavy ones. This would open the possibility to study decoherence in strongly interacting matter.



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