▁References ▁ ▁Mississippi ▁State ▁Bul ld ogs ▁Baseball ▁Team , ▁ 2 0 1 1 ▁Category : Miss iss ippi ▁State ▁Bul ld ogs ▁baseball ▁seasons ▁Mississippi ▁State ▁Miss <0x0A> </s> ▁P ert urb ative ▁quantum ▁chrom od ynam ics ▁( also ▁perturb ative ▁Q CD ) ▁is ▁a ▁sub field ▁of ▁particle ▁physics ▁in ▁which ▁the ▁theory ▁of ▁strong ▁interactions , ▁Quant um ▁Ch rom od ynam ics ▁( Q CD ), ▁is ▁studied ▁by ▁using ▁the ▁fact ▁that ▁the ▁strong ▁coupling ▁constant ▁ ▁is ▁small ▁in ▁high ▁energy ▁or ▁short ▁distance ▁interactions , ▁thus ▁allowing ▁perturb ation ▁theory ▁techniques ▁to ▁be ▁applied . ▁ ▁In ▁most ▁circumstances , ▁making ▁test able ▁predictions ▁with ▁Q CD ▁is ▁extremely ▁difficult , ▁due ▁to ▁the ▁infinite ▁number ▁of ▁possible ▁top olog ically - ine qu ivalent ▁interactions . ▁Over ▁short ▁distances , ▁the ▁coupling ▁is ▁small ▁enough ▁that ▁this ▁infinite ▁number ▁of ▁terms ▁can ▁be ▁approxim ated ▁accur ately ▁by ▁a ▁finite ▁number ▁of ▁terms . ▁Although ▁limited ▁in ▁scope , ▁this ▁approach ▁has ▁resulted ▁in ▁the ▁most ▁precise ▁tests ▁of ▁Q CD ▁to ▁date ▁. ▁ ▁An ▁important ▁test ▁of ▁perturb ative ▁Q CD ▁is ▁the ▁measurement ▁of ▁the ▁ratio ▁of ▁production ▁rates ▁for ▁ ▁and ▁. ▁Since ▁only ▁the ▁total ▁production ▁rate ▁is ▁considered , ▁the ▁summ ation ▁over ▁all ▁final - state ▁had rons ▁can c els ▁the ▁dependence ▁on ▁specific ▁had ron ▁type , ▁and ▁this ▁ratio ▁can ▁be ▁calculated ▁in ▁perturb ative ▁Q CD . ▁▁ ▁Most ▁strong -