▁( Here , ▁ 2 ▁is ▁the ▁square ▁of ▁the ▁four - m oment um ▁carried ▁by ▁that ▁particle ▁in ▁the ▁tree ▁Fe yn man ▁diagram ▁involved .) ▁The ▁propag ator ▁in ▁its ▁rest ▁frame ▁then ▁is ▁proportional ▁to ▁the ▁quantum - me chan ical ▁amplitude ▁for ▁the ▁decay ▁util ized ▁to ▁re construct ▁that ▁reson ance , ▁ ▁The ▁resulting ▁probability ▁distribution ▁is ▁proportional ▁to ▁the ▁absolute ▁square ▁of ▁the ▁amplitude , ▁so ▁then ▁the ▁above ▁relativ istic ▁Bre it – W igner ▁distribution ▁for ▁the ▁probability ▁density ▁function . ▁ ▁The ▁form ▁of ▁this ▁distribution ▁is ▁similar ▁to ▁the ▁amplitude ▁of ▁the ▁solution ▁to ▁the ▁classical ▁equation ▁of ▁motion ▁for ▁a ▁driven ▁harm onic ▁oscill ator ▁d amp ed ▁and ▁driven ▁by ▁a ▁sin us oid al ▁external ▁force . ▁It ▁has ▁the ▁standard ▁reson ance ▁form ▁of ▁the ▁Lor ent z , ▁or ▁C auch y ▁distribution , ▁but ▁involves ▁relativ istic ▁variables ▁  =   2 , ▁here ▁=   2 . ▁The ▁distribution ▁is ▁the ▁solution ▁of ▁the ▁differential ▁equation ▁for ▁the ▁amplitude ▁squ ared ▁w . r . t . ▁the ▁energy ▁energy ▁( fre quency ), ▁ ▁in ▁such ▁a ▁classical ▁forced ▁oscill ator , ▁ ▁with ▁ ▁References ▁▁ ▁Category : Cont inu ous ▁distributions ▁Category : Quant um ▁field ▁theory <0x0A> </s> ▁The ▁ 1 9 0 4 ▁Svens ka ▁M äst ers kap et ▁was ▁the ▁nin th ▁season ▁of ▁Svens ka ▁M äst ers kap et , ▁the ▁football ▁Cup ▁to ▁determine