Multi-gluon helicity amplitudes with one off-shell leg within high energy factorization

Hameren, A. van; Kotko, Piotr; Kutak, Krzysztof

doi:10.1007/jhep12(2012)029

Cited by 59 publications

(79 citation statements)

References 40 publications

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“…[11,34] and [35]. The equivalence of the CGC and HEF formulas in the dilute limit can be shown in a similar way for the cross sections of the other two subprocesses, gg * → qq and gg * → gg.…”

Section: Jhep09(2015)106mentioning

confidence: 57%

“…[10], such a procedure yields results which are gauge invariant within a subclass of axial gauges with the gauge vector n µ = ap µ p + bp µ A , where a and b are arbitrary complex numbers. There are also methods to calculate gauge invariant off-shell amplitudes in any gauge and choice of polarization vectors [34,35,47,48]. In what follows, we shall use those methods and specifically the results of [35,48].…”

Section: Off-shell Color-ordered Helicity Amplitudesmentioning

confidence: 99%

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Improved TMD factorization for forward dijet production in dilute-dense hadronic collisions

Kotko

Kutak

Marquet

et al. 2015

J. High Energ. Phys.

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129

141

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We study forward dijet production in dilute-dense hadronic collisions. By considering the appropriate limits, we show that both the transverse-momentum-dependent (TMD) and the high-energy factorization formulas can be derived from the Color Glass Condensate framework. Respectively, this happens when the transverse momentum imbalance of the dijet system, k t , is of the order of either the saturation scale, or the hard jet momenta, the former being always much smaller than the latter. We propose a new formula for forward dijets that encompasses both situations and is therefore applicable regardless of the magnitude of k t . That involves generalizing the TMD factorization formula for dijet production to the case where the incoming small-x gluon is off-shell. The derivation is performed in two independent ways, using either Feynman diagram techniques, or color-ordered amplitudes.

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Section: Jhep09(2015)106mentioning

confidence: 57%

Section: Off-shell Color-ordered Helicity Amplitudesmentioning

confidence: 99%

Improved TMD factorization for forward dijet production in dilute-dense hadronic collisions

Kotko

Kutak

Marquet

et al. 2015

J. High Energ. Phys.

Self Cite

129

141

View full text Add to dashboard Cite

show abstract

“…Note, however, that since there are no final state gluons, the ordinary Feynman diagram depicted in Fig. 1 (with appropriate high energy projector for the off-shell gluon as described in [10]) is enough to obtain the gauge invariant amplitude for this process, and all the complications discussed in [18,[21][22][23][24] do not have any impact here.…”

Section: Resultsmentioning

confidence: 99%

Resummation effects in the forward production ofZ0+jetat the LHC

2015

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We calculate several differential cross sections for Z0 and high-pT jet production in the forward rapidity region at the LHC using the hybrid High Energy Factorization. We test various unintegrated gluon distributions involving subleading BFKL effects (such as kinematic constraint, running strong coupling and DGLAP correction) and compare the results with experimental data obtained by the LHCb experiment. We find that the hard scale dependence of unintegrated gluon distributions, which effectively resums the Sudakov-type logarithms on the top of the resummation of the small x logarithms, is essential to describe the normalized azimuthal decorrelations between the Z0-boson and the jet. MotivationThe Large Hadron Collider opens an opportunity to explore kinematic regions where particles produced in high-energy collisions posses large transverse momenta and rapidities. The production of electroweak bosons and jets is a vital part of tests of Standard Model as well as searches of physics beyond the Standard Model. Furthermore it has been recognized in [1] that by studies of associated production of electroweak bosons and jets may provide a new insight into the transverse partonic structure of hadrons at small x, where x is the momentum fraction of the hadron taken by a parton participating in the hard collision. Furthermore, such a final state, being a combination of colorful and colorless particles, gives the opportunity for particularly interesting investigations complementary to results obtained in studies of pure jet final states [2][3][4][5][6] and Drell-Yan pairs [7]. In particular the final state rescatterings due to soft color exchanges should have less impact on the properties of produced final state as compared to pure jet final states. This work is motivated by a recent LHCb measurement [8] at √ s = 7 TeV of the process1 in the forward direction within the pseudorapidity range 2.0 < η < 4.5. The final-state muon and anti-muon were required to have transverse momenta p T µ > 20 GeV while the leading jet was considered with two different cuts: p T j > 10 GeV and p T j > 20 GeV. The jets were reconstructed using the anti-k T algorithm with radius R = 0.5 and they were required to be separated from muon tracks on the φ − η plane (azimuthal angle-pesudorapidity) by a distance R = 0.4. The muon-pair was required to have an invariant mass within the range 60 GeV < M µµ < 120 GeV. The rapidity constraint assures that in the partonic picture of the process, one of the initial state partons carries a rather small fraction x A of the corresponding hadron momentum p A , while the other must have a fraction x B x A (c.f. Fig. 1). In order to describe the process perturbatively, one definitely needs to go beyond the pure collinear factorization and support the calculation by a resummations. In the modern advanced approaches this is achieved by parton showers and hadronization as implemented for example in Pythia [9]. In the present work we consider another approach, namely a resummation of logarithms of ln(1/x ...

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“…[120] for details). Recently, fully general methods for calculating the off-shell amplitudes, which can be used in the framework of the high energy factorization, have been developed [124,125].…”

Section: High Energy Factorizationmentioning

confidence: 99%

QCD and jets at hadron colliders

Sapeta

2016

Progress in Particle and Nuclear Physics

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We review various aspects of jet physics in the context of hadron colliders. We start by discussing the definitions and properties of jets and recent development in this area. We then consider the question of factorization for processes with jets, in particular for cases in which jets are produced in special configurations, like for example in the region of forward rapidities. We review numerous perturbative methods for calculating predictions for jet processes, including the fixed-order calculations as well as various matching and merging techniques. We also discuss the questions related to non-perturbative effects and the role they play in precision jet studies. We describe the status of calculations for processes with jet vetoes and we also elaborate on production of jets in forward direction. Throughout the article, we present selected comparisons between state-of-the-art theoretical predictions and the data from the LHC.

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Multi-gluon helicity amplitudes with one off-shell leg within high energy factorization

Cited by 59 publications

References 40 publications

Improved TMD factorization for forward dijet production in dilute-dense hadronic collisions

Improved TMD factorization for forward dijet production in dilute-dense hadronic collisions

Resummation effects in the forward production ofZ0+jetat the LHC

QCD and jets at hadron colliders

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