1. 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

2. 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

3. GS in DIP

5. Gluon Saturation for only is the relevant scale

7. Balitsky-Kovchegov equation Saturation Dilute regime Non linear effects important negligible BKKL eq

8. Multiplicities for hadronic collisions

9. GS for pp at LHC

10. 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

18. Soft versus hard

19. 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

20. --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