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Universal geometrical scaling in pp,pA,AA collisions and saturation of gluons C.Pajares Dep Física Partículas & IGFAE Universidad Santiago de Compostela II Russian Spanish Congress St Petersburg October 1-4 2013
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Outline Geometrical scaling in DIP GS in pp GS in hadronic collisions Normalization dN/dy in pp,AA GS in pp,pA and AA In collaboration with C.Andres,A.Moscoso Nucl PhysA 901 14 2013
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GS in DIP
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Gluon Saturation for only is the relevant scale
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Balitsky-Kovchegov equation Saturation Dilute regime Non linear effects important negligible BKKL eq
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Multiplicities for hadronic collisions
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GS for pp at LHC
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For different nuclei,different centralities and energies attention must be paid to normalization,in such a way that the integrated pt spectrum dN/dy, should agree with the experimental data
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Soft versus hard
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Conclusions --The gluon saturation implies GS --Hera data and the new pp LHC data satisfy GS --The RHIC data at 62 and 200 for Cu-Cu and Au-Au collisions at different centralities satisfy GS for transverse momemtum smaller than Qs and larger than the confined QCD scale --The Pb-Pb LHC data at different centralities and the pPb LHC data satisfy GS.For large pt there is a supression on pt larger for heavier nuclei and for central collisions
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--All the transverse momentum distributions for all the energies and centralities(pp,pPb, Cu-Cu,Pb-Pb)are lying in the same curve if a proper normalization is used --The higher energy or centrality,the smaller the hard fraction of events is
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