High-energy resummation in semi-hard processes at the LHC

Abstract

Semi-hard processes in the large COM energy limit offer us an exclusive chance to test the dynamics behind strong interactions in kinematical sectors so far unexplored. In the Regge limit, fixed-order calculations in pQCD based on collinear factorisation miss the effect of large energy logs, which are so large to compensate the small QCD coupling ${\alpha }_s$ and must therefore be accounted for to all perturbative orders.. The BFKL approach represents the most powerful tool to resum to all orders these large logs both in the LLA and in the NLA. The inclusive hadroproduction of forward jets with high transverse momenta separated by a large rapidity interval at the LHC (Mueller--Navelet jets) has been one of the most studied reactions so far. Interesting observables associated to this process are the azimuthal correlations, showing a very good agreement with experimental data at the LHC. However, new BFKL-sensitive observables should be considered in the context of the LHC physics program. With the aim the to further and deeply probe the dynamics of QCD in the Regge limit, we give phenomenological predictions for four distinct semi-hard process. On one hand, we continue the analysis of reactions with two objects identified in the final state $(i)$ by addressing open problems in the Mueller--Navelet sector and $(ii)$ by studying the inclusive dihadron production in the full NLA BKFL accuracy. On the other hand, we show how inclusive multi-jet production processes allow us to define new, generalised and suitable BFKL observables, where transverse momenta and rapidities of the tagged jets, well separated in rapidity from each other, appear in new combinations. We give the first predictions for the inclusive three-jet production, encoding the effects of higher-order BFKL corrections. Then, making use of the same formalism, we present the first complete BFKL analysis for the four-jet production.

arXiv comment229 pages, 10 tables, 63 figures, PhD thesis

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