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Fragmentation Functions (FF) are universal non-perturbative objects thatmodel hadronization in some general kind of processes. They are mainlyextracted from experimental data, hence constraining the parameters of thecorresponding fits is crucial for achieving reliable results. As expected, theproduction of lighter hadrons is favoured w.r.t. heavy ones, thus we would liketo exploit the precise knowledge of pion FFs to constraint the shape of kaon(or heavier) FFs. In this talk, we show how imposing specific cuts onphoton-hadron production leads to relations between the $u$-started FFs. Fordoing so, we exploit the reconstruction of momentum fractions in terms ofexperimentally-accessible quantities and introduce NLO QCD + LO QED correctionsto reduce the theoretical uncertainties.

Using photon-hadron production to impose restrictions on heavy-hadrons fragmentation functions