Study of the PYTHIA ΔηΔϕ correlation as a function of multiplicity and transverse sphericity in proton-proton collisions at 7 TeV

The study and understanding of the details of proton-proton collisions is important since they are the benchmark for the comparison with heavy ion results. In the present work we have studied the ΔηΔ correlations as a function of the event multiplicity and transverse sphericity in pp collisions at = 7 TeV using the PYTHIA 8.180 generator. The results show large variation in the shape of the correlation as function of the sphericity and multiplicity indicating the importance of slicing the data in bins of both observables to better understand the complexity of the interactions. Motivated by the flow like patterns originated by color reconnection (CR), results with and without CR together with dihadron correlations are discussed.