High-energy effects in forward inclusive dijet and hadron-jet production

Abstract

Pursuing the goal to single out the validity region of the high-energy resummation, better known as BFKL approach, and to possibly disentangle BFKL effects from the ones coming from a DGLAP-inspired, fixed-order description, new predictions for the forward inclusive hadron-jet production, tailored on the CMS and CASTOR acceptances, are given.

BFKL phenomenology: resummation of high-energy logs in inclusive processes

“…For the Higgs-jet process, we can remarkably notice that NLA predictions (red) are almost entirely nested inside LLA uncertainty bands (blue), since the large energy scales provided by the emission of a Higgs boson suppress the higher order corrections [61,62]. Cross sections in the Λ-jet channel are steadily lower when compered to the previously studied di-hadron [31][32][33] and the hadronjet [37] reactions, this, together with the fact that the lower cutoff to identify Λ hyperon is 10 GeV, which is larger than the corresponding one for any light-hadron tagging, that gives us the opportunity to quench the experimental minimum-bias effects.…”

“…The BFKL Green's function obeys an integral equation, whose kernel is known at the next-to-leading order (NLO) [6][7][8][9][10]. Over last years, pursuing the goal of identifying observables that fit the data where BFKL approach is needed, a number of reactions have been proposed for different collider environments: the exclusive diffractive leptoproduction of two light vector mesons [11][12][13][14][15], the inclusive hadroproduction of two jets featuring large transverse momenta and well separated in rapidity, the so-called Mueller--Navelet jets [16], for which several phenomenological studies have appeared during last years [17][18][19][20][21][22][23][24][25][26][27][28][29][30], the inclusive detection of two light-charged rapidityseparated hadrons [31][32][33], three-and four-jet hadroproduction [34,35], J/Ψ-plus-jet [36], hadron-plus-jet [37], heavy-flavor [38][39][40][41] and forward Drell-Yan dilepton production with a possible backward-jet tag [42]. The second class of probes for BFKL is given by single forward emissions in lepton-proton or proton-proton scatterings, giving us the possibility to probe the unintegrated gluon distribution in the proton (UGD), which is linked to BFKL via the convolution between the BFKL gluon Green's function and the proton impact factor.…”

High-energy resummation in inclusive hadroproduction of Higgs plus jet

“…Typical BFKL observables at the LHC are the azimuthalangle correlations of the tagged particles in the final state, which are separated in rapidity, here the experimental challenge being a good resolution in the azimuthal plane, while the 039.1 theoretical challenge is the incorporation of NLO corrections to impact factors, so as to treat different processes with consistent accuracy, and make predictions to be compared with data. Recently, a number of probes for BFKL signals have been proposed for different collider environments: the diffractive leptoproduction of two light vector mesons [6][7][8][9], the total cross section of two highly-virtual photons [10], the inclusive hadroproduction of two jets with large transverse momenta and well separated in rapidity (Mueller-Navelet channel [11]), for which several phenomenological studies have carried out so far (for more details see [12] and references therein), the inclusive detection of two light-charged hadrons [13][14][15], threeand four-jet hadroproduction [16][17][18][19][20][21], J/Ψ-jet [22], hadron-jet [23][24][25], the inclusive production of rapidity-separated Λ-Λ or Λ-jet pairs [26], and recently, double Λ c or of a Λ c plus a light-flavored jet system [27], Drell-Yan-jet [28,29] and heavy-quark pair photo- [30,31] and hadroproduction [32,33].…”