Explanation of systematics of CMS p+Pb high multiplicity dihadron data at √s_NN=5.02 TeV

In a recent article, we showed that high multiplicity dihadron proton-proton (p+p) data from the CMS experiment are in excellent agreement with computations in the color glass condensate effective field theory. This agreement of the theory with several hundred data points provides a nontrivial description of both nearside ("ridge") and awayside azimuthal collimations of long range rapidity correlations in p+p collisions. Our prediction in Dusling and Venugopalan for proton-lead (p+Pb) collisions is consistent with results from the recent CMS p+Pb run at √s _NN=5.02 TeV for the largest track multiplicity N_track∼ 40 we considered. The CMS p+Pb data shows the following striking features: (i) a strong dependence of the ridge yield on N_track, with a significantly larger signal than in p+p for the same N_track, (ii) a stronger p_T dependence than in p+p for large N_track, and (iii) a nearside collimation for large N_track comparable to the awayside for the lower p_T=pTtrig=pTassoc dihadron windows. We show here that these systematic features of the CMS p+Pb di-hadron data are all described by the color glass condensate (with parameters fixed by the p+p data) when we extend our prediction in Dusling and Venugopalan to rarer high multiplicity events. We also predict the azimuthally collimated yield for yet unpublished windows in the pTtrig and pTassoc matrix.