6pp at extremely high E, ie, E=-14TeVMultipleelementaryinteractions(Pomerons)inNEXUS/EPOSremnanteroorePomeron numbermight be verybigWeneedapost-collisionevolutiontotreatthemany-bodysystemremnantQuestion: Howto treat the afterward secondary scattering?on partonlevel?oronhadronlevel?orstringinteraction?orPomeroninteraction?
pp at extremely high E, ie, E=14TeV Multiple elementary interactions (Pomerons) in NEXUS/EPOS: Question: How to treat the afterward secondary scattering ? on parton level ? or on hadron level? or string interaction? or Pomeron interaction? Pomeron number might be very big. We need a post-collision evolution to treat the many-body system. Rapidity 6
7Direct photon data in pp (ppbar))10310210LatestPDGreview10D0 (ppat1.96TeV,nl<0.9)102CDF(ppat1.8TeV,mk0.9)Do (pat1.8TeV,ml<0.9)103D0(pat1.8TeV1.6<nl2.5)D0(ppat630GeV,Iml<0.9)D0(ppal630GeV1.6<inl2.5)104CDF(ppat630GeV,In<0.9)UA2(ppat630GeVTeVn=0)10~5UA1(ppat630GeVTeVn=0UA6(ppat24.3GeVTeV,y>=0.410°1010,(Gev/c)10PresentdataaregenerallyingoodagreementwithNLOQCDprediction.But a tendencyforthe data to be above (below) the theory for lower (large)pt
Present data are generally in good agreement with NLO QCD prediction. But a tendency for the data to be above (below) the theory for lower (large) pt. Direct photon data in pp (ppbar) Latest PDG review 7