It takes place when a quark of one hadron and an antiquark of another hadron annihilate , creating a virtual photon or Z boson which then decays into a pair of oppositely - charged leptons .
Head entity: quark Q6718 5
Tail entity: hadron Q101667 8 14
Relation (head \u2192 tail): P361
Inverse relation (tail \u2192 head): P527