Elliptic flow in proton-proton collisions at 7 TeV

The angular correlations measured in proton-proton collisions at 7 TeV are decomposed into contributions from transverse momentum conservation effects and from the elliptic flow. Separating the dominant background due to momentum conservation correlations, allows to extract the elliptic flow coefficient for pairs of particles separated in pseudorapidity. The elliptic flow resulting from the CMS Collaboration data is v2 =4%. No additional small-angle, ridge-like correlations are needed to explain the experimental data.