Abstract
We study ratios of azimuthal-angle distributions in Mueller–Navelet jets after imposing a rapidity veto constraint: the minijet radiation activity is restricted to only allow final-state partons separated at least a distance in rapidity b. It is well-known that the asymptotic growth with the rapidity separation of the two tagged jets of the NLLA BFKL Green's function requires a value of b≃O(2) in order to avoid unphysical cross sections. We further investigate this point from a phenomenological point of view and work out those values of b which best fit angular distributions measured at the LHC in a realistic set-up where impact factors and parton distribution effects are also taken into account.
Highlights
The phenomenological study of processes at the high energy limit of Quantum Chromodynamics (QCD) offers invaluable information that goes beyond the perturbative regime of the theory
That at NNLA the positiveness of cross sections was not always ensured. This is due to the presence of large collinear logarithms that need extra treatment, a step that led to the so-called collinearly improved BFKL kernel [9,10] allowing for more robust phenomenological studies based on next-to-leading logarithmic approximation (NLLA) BFKL
The theoretical uncertainty from the variation of the renormalization scale8 is represented by a bluish band the limits of which are obtained for μR = μcRentr/2 and μR = 2μcRentr, where μcRentr is the renormalization scale used for the computation of the central blue dashed line within the bluish uncertainty band
Summary
The phenomenological study of processes at the high energy limit of Quantum Chromodynamics (QCD) offers invaluable information that goes beyond the perturbative regime of the theory. In order to improve the LLA accuracy, the next-to-leading logarithmic approximation (NLLA) corrections to the BFKL kernel were calculated [7,8], where terms that behave like αs(αs log s)n were taken into account It was seen that at NNLA the positiveness of cross sections was not always ensured.
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