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The recently reported effect of long-range near-side angular correlations atLHC occurs for large multiplicities of particles with$1\,GeV\,<p_T\,<\,3\,GeV$. To understand the effect several possibilities havebeen discussed. In the letter we propose a simple qualitative mechanism whichcorresponds to gluon bremstralung of quarks moving with accelerationappropriate to the quark--anti-quark string. The smallness of azimuthal angledifference $\Delta \phi$ along with large $\Delta \eta$ at large multiplicitiesin this interval of $p_T$ are natural in the mechanism. The mechanism predictsalso bremstralung photons with mean values of $p_T \approx 2.9$ and$0.72\,GeV$.

CMS ridge effect at LHC as a manifestation of bremstralung of gluons due to the quark-anti-quark string formation