Isospin breaking in hadronic reactions

In the standard model the isospin symmetry is broken by electro magnetic interactions as well as the difference in the quark masses. Given a systematic scheme that allows to disentangle these two effects it is possible to get direct access to properties of QCD from low and medium energy hadronic reactions.Recently interest in isospin breaking reactions has revived due to the measurement of a forward-backward asymmetry in pn -> d pi(0) as well as the total cross section for dd -> alpha pi(0)-both quantities vanish in an isospin symmetric world. The current status of the theoretical analysis for these reactions is disucssed.In addition, I will briefly discuss how the isospin violating a(0)(980) - f(0)(980) transition amplitude can be studied in dd and pn induced production reactions-a quantity that is believed to reveal important information on the nature of these lightest scalar mesons