Fig.(8) Comparison of the full NLL BFKL calculation with either a “natural” scale µ=kj,1.kj,2
or a large scale µ=8kj,1.kj,2 and
the CMS data, using symmetric cuts defined in Eq. (13). Left: value of <cos 3φ>/ <cos2φ> as a function of the rapidity separation Y. Right:
value of the azimuthal distribution integrated over the range 6 <Y< 9.4 as a function ofφ.