qgp强子化过程中夸克组合机制普适性的.研究

《qgp强子化过程中夸克组合机制普适性的.研究》由会员上传分享，免费在线阅读，更多相关内容在应用文档-天天文库。

1、AbstractPeoplebegantostudythepropertiesofnuclearmatterunderextremeconditionsfromboththeoryandexperimentintheearly1970s．Fromthenontherelativisticheavyioncollisionshavebecomethefrontierofmodernphysics．SincethestartupofRelativisticHeavyIonCollider(RHIC)atBNLinAmerica，lotsofattractiv

2、edataarepublished．Andtherearemanyan-expected‘spotlights’，e．g．，thebaryonenhancementintheintermediatePTrange，thenuclearmodificationfactor％Pseparatingintotwogroupsofbaryonsandmesons，thevalenceQuarkNumberScalingofhadronicellip-ticflows，andthedisappearingoftheback-to-backazimuthalcorr

3、elationofhighPTbi—hadrons．TheseobservationsimplystronglythatthepartonsarecreatedinRHICreactions．Themostpersuasiveproofsaretheelliptic—flowandRvpbehaviorsfor西meson，whichhasthesamemassbutadifferentvalencequarkcontentwithproton．However，矽mesonbehaveslikeother，lightermesons，notlikepro

4、ton．Inshort，experimentsatRHICsuggesttheproductionofthehotdensepartonmatter，andthecombination，insteadofthefragmentation。iSthemainhadronizationmechanismat1eastintheintermediatePTrange．Then，isthecombinationvalidatlowandhighPT?Andisittheuniversalhadronizationmechanism?Theyarethemaini

5、ssuesdiscussedinthethesis．HadronizationcannotbesolvedbyperturbativeQCD．Besidestheap-proachofLatticeQCD，therearetwokindsofmethodswidelyused：thefragmentationandcombinationmodels．ThecombinationmodelsinRHICcollisionsaremainlyCoalescence，Recombination，andourQuarkCombina-tionModel(QCM)

6、．Intheearly1980s，basedonthecoalescencepicture，Q．B．Xieeta1．proposedsystematicallythequarkproductionrulesandthequarkcombinationrules．ThenQ．Wang，Z．G．Sieta1．extendedthemintomulti—partonsystem，andsuccessivelyreproducedmanydatainw(p)reactionsande+e—annihilations．Thequarkproductionrules

7、calculatetheVaveragednumberofnewbornquarksfortheqqcolorsingletsystemwiththeenergyS．Allquarkscombineintohadronsbythequarkcombinationruleswhichsatisfythefundamentalrequirementsof“nearcorrelationinrapidity’’andtheQCD．Thedemandof“nearcorrelationinrapidity’’determinestheruleof‘mesonpr

8、oductionpriortobaryon’inthehadronization