当前位置： 文档下载 > 所有分类 > Multipole Analysis of Recent Pion Electroproduction DataWe have performed a series of global and single-Q2 fits to the growing database for pion electroproduction. We compare to some other recent fits which have used different formalisms, more selective datasets, and truncated multipole expansions. We present r
February8,200823:10WSPC/TrimSize:9inx6inforProceedingsnstar02
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002 anJ 42 3v8601030/th-lcu:nviXraMULTIPOLEANALYSISOFRECENTPION
ELECTROPRODUCTIONDATA
R.ARNDT,W.BRISCOE,I.STRAKOVSKY,ANDR.WORKMAN
CenterforNuclearStudies,DepartmentofPhysics
TheGeorgeWashingtonUniversity,Washington,D.C.20052
Wehaveperformedaseriesofglobalandsingle-Q2 tstothegrowingdatabaseforpionelectroproduction.Wecomparetosomeotherrecent tswhichhaveuseddi erentformalisms,moreselectivedatasets,andtruncatedmultipoleexpansions.WepresentresultsfortheE2/M1andS2/M1ratios,asafunctionofQ2.
1.FitProcedure
In ttingthepionelectroproductiondatabase1,wehave xedtheQ2=0pointbasedonour tstopionphotoproduction2.Thephotoproductionmultipoleshavebeenparametrizedusingtheform
M=(Born+αB)(1+iTπN)+αRTπN+(ImTπN TπN2
)(αHr+iαHi),(1)
containingtheBornterms,withphenomenologicalpieces(α)maintainingthecorrectthresholdbehaviorandWatson’stheorem.TheπNT-matrix(TπN)connectseachmultipoletostructurefoundintheelasticπNscat-teringanalysis.AdditionalstructureisparametrizedthroughtheBornterms(whichcontainvector-mesoncontributions),andthephenomenolog-icalstructurefunctions(αB,αR,αHr,andαH
i).
Atnon-zeroQ2,theBorntermshavebuilt-inQ2dependence,othertermshavebeenmodi edbyafactor
f(Q2)=
k ΛQ
2(1+Q2/0.71)2
e 1+αQ2+β W
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