Gluon saturation in dijet production in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi></mml:math>-Pb collisions at the Large Hadron Collider

Kutak, Krzysztof; Sapeta, Sebastian

doi:10.1103/physrevd.86.094043

Cited by 139 publications

(180 citation statements)

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“…Separately, the HEF and TMD approaches to dijet production have been extensively studied in the literature [11,[15][16][17][18] and [12,[19][20][21][22][23][24][25], but little connection has been made between them so far. The first result of this paper is to reveal that connection, in the context of dilute-dense collisions, and to show that, in fact, they are both contained in the CGC description.…”

Section: Jhep09(2015)106mentioning

confidence: 99%

“…And even when the transverse momentum imbalance of the dijet system is of the same order as the jet transverse momenta themselves, implying that both parton distributions are probed in their radiative tail, the small x 2 (BFKL) evolution implies a 1/k t behavior on the target side, while DGLAP evolution implies a 1/k 2 t behavior on the projectile side. To take into account small-x effects in dijet production, an approach that has been broadly used in phenomenological studies involves the so-called high energy factorization (HEF) formula [15] …”

Section: Forward Dijets In P+a Collisionsmentioning

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.

134

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: 99%

Section: Forward Dijets In P+a Collisionsmentioning

confidence: 99%

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

Kotko

Kutak

Marquet

et al. 2015

J. High Energ. Phys.

134

141

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“…• BFKL evolution with kinematic constraint, running strong coupling constant, DGLAP effects including the contribution from the quark sea [26] and supplemented with the nonlinear term [27]; the initial condition has been fitted to HERA data [28] (KS)…”

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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“…The new result for the unintegrated gluon density with angular ordering is given by equation (3.12). For other approach to extend the equation for the unintegrated gluon density to be able to deal with exclusive processes at high p t we refer the reader to [16] and for latest applications of this framework to [9].…”

Section: Jhep12(2012)033mentioning

confidence: 99%

“…For recent overview we refer the reader to [4,5]. Already some time ago it has been recognized that saturation can be conveniently studied in the production of system of forward central di-jets [6][7][8], and recently that the signal of saturation might be expected in processes with high p t ≃ 20 GeV or larger [9]. With a system complicated enough like p-Pb, one may ask the question whether appropriate factorization of the process into hard parts, and parton densities can be establish taking all relevant degrees of freedom into account.…”

Section: Introductionmentioning

confidence: 99%

Resummation in nonlinear equation for high energy factorizable gluon density and its extension to include coherence

Kutak

2012

J. High Energ. Phys.

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Motivated by forthcoming p-Pb experiments at Large Hadron Collider which require both knowledge of gluon densities accounting for saturation and for processes at a wide range of p t we study basic momentum space evolution equations of high energy QCD factorization. Solutions of those equations might be used to form a set of gluon densities to calculate observables in generalized high energy factorization. Moreover in order to provide a framework for predictions for exclusive final states in p-Pb scattering with high p t we rewrite the equation for the high energy factorizable gluon density in a resummed form, similarly to what has been done in [1] for the BK equation. The resummed equation is then extended to account for colour coherence. This introduces an external scale to the evolution of the gluon density, and therefore makes it applicable in studies of final states.

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Gluon saturation in dijet production inp-Pb collisions at the Large Hadron Collider

Cited by 139 publications

References 94 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

Resummation in nonlinear equation for high energy factorizable gluon density and its extension to include coherence

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