measurement and qcd analysis of the diffractive deep-inelastic scattering cross section atnew

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1、DESY06-049ISSN0418-9833May2006MeasurementandQCDAnalysisoftheDiffractiveDeep-InelasticScatteringCrossSectionatHERAH1CollaborationAbstractAdetailedanalysisispresentedofthediffractivedeep-inelasticscatteringprocessep→eXY,whereYisaprotonoralowmassprotonexcitationc

2、arryingafraction1−x>0.95IPoftheincidentprotonlongitudinalmomentumandthesquaredfour-momentumtransferattheprotonvertexsatisfies

3、t

4、<1GeV2.UsingdatatakenbytheH1experiment,thecrosssectionismeasuredforphotonvirtualitiesintherange3.5≤Q2≤1600GeV2,tripledifferentiallyin

5、x,Q2andβ=x/x,wherexistheBjorkenscalingvariable.IPIPAtlowx,thedataareconsistentwithafactorisablexdependence,whichcanbeIPIPdescribedbytheexchangeofaneffectivepomerontrajectorywithinterceptα(0)=IP1.118±0.008(exp.)+0.029(model).Diffractivepartondistributionfunctio

6、nsandtheir−0.010uncertaintiesaredeterminedfromanext-to-leadingorderDGLAPQCDanalysisoftheQ2andβdependencesofthecrosssection.Theresultinggluondistributioncarriesaninte-gratedfractionofaround70%oftheexchangedmomentumintheQ2rangestudied.Totalanddifferentialcrossse

7、ctionsarealsomeasuredforthediffractivechargedcurrentprocesse+p→ν¯eXYandarefoundtobewelldescribedbypredictionsbasedonthediffractivepartondistributions.Theratioofthediffractivetotheinclusiveneutralcurrentepcrosssectionsisstudied.Overmostofthekinematicrange,thisr

8、atioshowsnosignificantde-pendenceonQ2atfixedxandxoronxatfixedQ2andβ.IPSubmittedtoEur.Phys.J.CA.Aktas9,V.Andreev25,T.Anthonis3,B.Antunovic26,S.Aplin9,A.Asmone33,A.Astvatsatourov3,A.Babaev24,†,S.Backovic30,A.Baghdasaryan37,P.Baranov25,E.Barrelet29,W.Bartel9,S.Baudr

9、and27,S.Baumgartner39,M.Beckingham9,O.Behnke12,O.Behrendt6,A.Belousov25,N.Berger39,J.C.Bizot27,M.-O.Boenig6,V.Boudry28,J.Bracinik26,G.Brandt12,V.Brisson27,D.Bruncko15,F.W.B¨usser10,A.Bunyatyan11,37,G.Buschhorn26,L.Bystritskaya24,A.J.Campbell9,F.Cassol-Brunner2

10、1,K.Cerny32,V.Cerny15,46,V.Chekelian26,J.G.Contreras22,J.A.Coughlan4,Y.R.Coppens2,B.E.Cox20,G.Cozzika8,J.Cvach31,J.B.Dainton17,W.D.Dau14,K.Daum36,42,Y.deBoer24,B.Delcourt27,M.DelDe