在LM中計及單圈頂角修正時計算核子共振態(tài)強衰變寬度及其耦合常數(shù)探討.pdf

1、重慶大學碩士學位論文在LM中計及單圈頂角修正時計算核子共振態(tài)強衰變寬度及其耦合常數(shù)探討姓名：唐云青申請學位級別：碩士專業(yè)：理論物理指導教師：王銀峰吳興剛20091128重慶大學碩十學位論文英文摘要ABSTRACTAsagreatnumberofnucleonresonancestatesexistinhighenergyphysicalexperiments，theresearchofthenucleonresonancestateco

2、uldbeusedtoexploretheinteriorstructureandstronginteractionofbaryons，andprovidealotofimportantinformationforunderstandingsomestrangestatesandmechanismsofthestrongdecayTherefore，theresearchofnucleonresonancestateisofgreati

3、mportanceAlthoughatpresenttherearemanytheoriesaboutthestronginteraction，thosetheoriesandmodelshaveencounteredsomedifficultiesOnlythequarkmodelhasbeenrelativelysuccessfulforthestronginteraction，theelementaryprinciplesofin

4、teractionamongquarksinparticular———廿1eexperimentofQCDhasprovedthat，thestronginteractionhasagainbecomeanelementaryissueofphysicsHowever，intheQCDtheoryweneedtoknowthequarkconfigurationofparticles，andthequarkconfigurationof

5、nucleonresonancestatesisyetunknown，withtheresultthattheQCDtheoryisnotapplicableforresearchingthenucleonresonancestateparticlesTherefore，thethesishasconsideredthe“phenomenologicalmodel”，paidreferencetotheLorentzInvariable

6、CouplingModelonthenucleon一礦interaction，andbuilttheLorentzInvariableCouplingModel(LM)，whichdescribesthenucleonresonancestate礦—nucleonⅣ——neutralmeson萬ostronginteractionThethesishascalculatedthedecaywidthofthestrongdecayof“

7、Ⅳ‘N一萬0’’exacttothesingleloopvertexcorrection，andcomparedit、viththeexperimentresult，andobtainedthepreciseeffectivecouplingconstantGfⅣ1Withtheeffectivecouplingconstant，thethesishascalculatedthedecaywidthinthetreediagrampro

8、pagation，anddiscussedtherationofthedecaywidthinthetreediagrampropagationovertheexperimentvalueIthasbeenfoundthatthelargermassthenucleonresonancestatehas，thegreatercontributionthetreediagrampropagationmakes，andthemorereli

9、abletheperturbationtheoryisTheresearchfmdingswilllayanimportantfoundationfortheoreticalanalysisandcalculationtreatmentforin—depthresearchofthestronginteraction“Ⅳ’N萬o”Thecalculationofthesingleloopvertexrenormalizationfunc

10、tion人c(p，q)isthedifficultpointinthethesisInthesingleloopvertexrenormalizationcalculation，thethesishasappliedtherenormalizationmethodbygettingridoftheunphy7sicalinfiniteandretainingthephysicalfiniteAstheresultofthesinglel