Mueller–Navelet small-cone jets at LHC in next-to-leading BFKL

Abstract

We consider within QCD collinear factorization the process p + p → jet + jet + X, where two forward high-p T jets are produced with a large separation in rapidity ∆y (Mueller-Navelet jets). In this case the (calculable) hard part of the reaction receives large higher-order corrections ∼ α n s (∆y) n , which can be accounted for in the BFKL approach with next-to-leading logarithmic accuracy, including contributions ∼ α n s (∆y) n−1 . We calculate several observables related with this process, using the next-to-leading order jet vertices, recently calculated in the approximation of small aperture of the jet cone in the pseudorapidity-azimuthal angle plane. †

Dihadron production at the LHC: full next-to-leading BFKL calculation

“…In the BFKL approach the cross section can be presented (see Ref. [26] for the details of the derivation) as the Fourier sum of the azimuthal coefficients C n , thus…”

“…A large number of numerical analyses [23][24][25][26][27][28][29][30][31][32][33][34][35] has appeared so far, which have been devoted to NLA BFKL predictions for the Mueller-Navelet jet production process. All these studies are involved in calculating cross sections and azimuthal angle correlations [36,37] between the two measured jets, i.e.…”

Mueller–Navelet jets at 13 TeV LHC: dependence on dynamic constraints in the central rapidity region

“…(36) and (37) of Ref. [25]) and the upper cutoff in the numerical integrations over | k J 1 |, | k J 2 |, and ν, are negligible with respect to the first one. For this reason the error bars of all predictions presented in this work are just those given by the Dadmul routine.…”

“…The implementation of several jet reconstruction algorithms, both in the exact jet vertex and in its "small-cone" version, has been carried out in [23]. A lot of papers have appeared, so far, about the MuellerNavelet jet production process at LHC, both at a center-ofmass energy of 14 TeV [24][25][26] and 7 TeV [27][28][29][30][31]. Their main aim was the study of the Y -dependence of azimuthal angle correlations between the two measured jets, i.e.…”

Stability of azimuthal-angle observables under higher order corrections in inclusive three-jet production

“…x 1,2 are the longitudinal momentum fractions of the partons that are adjacent to the jets. Various works [12,13,14,15,16,17,18,19,20,21,22,23,24,25,26] addressing the azimuthal 2 angle (θ) profile of the two tagged jets, suggest the presence of important minijet activity populating the rapidity interval which can be taken into account by considering a BFKL gluon Green function connecting the two jets. However, it was shown that the azimuthal angle behaviour of the tagged jets is strongly contaminated by collinear effects [27,28], that have their origin at the n = 0 Fourier component in θ of the BFKL kernel.…”