12937.重夸克偶素電磁輻射衰變的研究

1、分類號(hào)—0572—243學(xué)校代碼密級(jí)非密重夸克偶素電磁輻射衰變的研究TheStudyofHeavyQuarkoniaofElectromagneticRadiativeDecay研究生姓名指導(dǎo)教師姓名、職稱學(xué)科專業(yè)研究方向鄧偉俊鐘顯輝教授理論物理粒子物理湖南師范大學(xué)學(xué)位評(píng)定委員會(huì)辦公室二O一六年六月II碩士學(xué)位論文AbstractWesystematicallystudytheelectromagnetictransitionsofth

2、enS，他P(佗≤3)，andnD(禮≤2)charmoniumstatesandbottomoniumstateswithaconstituentquarkmodelInourcaculations，weobtainareasonabledescriptionoftheelectromagnetictransitionsofthewellestablishedlowlyingcharmoniumstatesJ／妒，妒(2S)，xd(1

3、P)，hc(1P)and妒(3770)OurpredictionsofelectromagneticdecaypropertiesforthehighercharmoniumstatesarealsopresentedandcomparedwithothermodelpredictionsInparticular，weanalyzedtheraodiativetransitionprocessofsome“XYZ’’stateasCha

4、rmoniumstate，suchasX(3823)、X(3872)、X(3915)、X(3940)andX(4315)ConsideringtheX(3872)resonanceasthexcl(2P)state，westudyitselectromagneticdecaypropertiesOurpredictedratiofix(3872)_矽(2S)7]／F[X(3872)?！紊?】whichvalueis一150，it’Sdi

5、fferentfromexperimentalmeasurementsobviouslyOurtheoreticalmodeldoesnotsupporttheX(3872)asacandidateofxcl(2P)fromthisbranchingrateOnthisbasis，wefurtherstudiedbottomoniumsystemwhichhaslowerrelativisticeffectsWeobtainsomere

6、asonabledescriptionofthemeasureddecayrates，butwecanalsofindthatsomeofourpredictionsarenotablydifferentfromthoseofothermodelsInOUrcalculations，wefoundthatsomeoftheE1transitionsdominantradiativedecayprocess，interferenceeff

7、ectsbetweenE1andM2transitionswillproducesignificantcorrectiontesultsWehopeourstudycouldprovidesomeusefulreferencestoobservetheEMradiativetransitionsbetweenheavy—quarkniumstatesinforthcomingexperimentsKeywords：constituent