Double parton scattering inpp collisions at $$\sqrt s = 63$$ GeV

Åkesson, T. P. A.; Albrow, M.; Almehed, S.; Benary, O.; Bøggild, H.; Botner, O.; Breuker, H.; Carter, A. A.; Carter, J. R.; Choi, Y.; Cleland, W.; Dagan, S.; Dahl‐Jensen, E.; Dahl-Jensen, I.; Damgaard, G.; Fabjan, C.; Goerlach, U.; Hansen, Klavs; Hedberg, V.; Jarlskog, G.; Katsanevas, S.; Kjaer, N. J.; Kroeger, R.; Kulka, K.; Lissauer, D.; Lörstad, B.; Μάρκου, Α.; McCubbin, N. A.; Mjörnmark, U.; Möller, R.; Nielsen, B. S.; Olsen, L.; Oren, Y.; Schukraft, J.; Spang, Katrine Søborg; Specht, H. J.; Sullivan, M. K.; Thodberg, Hans Henrik; Thompson, JA; Vella, E.; Williamson, J.; Willis, W.

doi:10.1007/bf01566757

Cited by 172 publications

(89 citation statements)

References 17 publications

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“…[14], a Light-Front (LF) Poincaré covariant approach, reproducing the essential sum rules of dPDFs without ad hoc assumptions and containing natural two-parton correlations, has been described. We note in passing that, although it has not yet been possible to extract dPDFs from data, the so called "effective cross section", σ eff , the ratio of the product of two single parton scattering cross sections to the DPS cross section with the same final states, has been extracted, in a model dependent way, in several experiments [17][18][19][20][21][22]. Despite of large error bars, the present experimental scenario is consistent with the idea that σ eff is constant w.r.t.…”

Section: Jhep10(2016)063mentioning

confidence: 99%

“…We evolve to Q 2 = 250 GeV 2 , a scale relevant to study properties of dPDFs, as shown by experiments [17][18][19][20][21][22] and by a quite recent theoretical study within the LF approach [23]. In two series of figures, (figures 12 and 13), we compare the results obtained evolving directly from the lowest scale µ 2 0 where only valence-valence dPDFs are present (cfr.…”

Section: Jhep10(2016)063mentioning

confidence: 99%

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Correlations in double parton distributions: perturbative and non-perturbative effects

Rinaldi

Scopetta

Traini

et al. 2016

J. High Energ. Phys.

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The correct description of Double Parton Scattering (DPS), which represents a background in several channels for the search of new Physics at the LHC, requires the knowledge of double parton distribution functions (dPDFs). These quantities represent also a novel tool for the study of the three-dimensional nucleon structure, complementary to the possibilities offered by electromagnetic probes. In this paper we analyze dPDFs using Poincaré covariant predictions obtained by using a Light-Front constituent quark model proposed in a recent paper, and QCD evolution. We study to what extent factorized expressions for dPDFs, which neglect, at least in part, two-parton correlations, can be used. We show that they fail in reproducing the calculated dPDFs, in particular in the valence region. Actually measurable processes at existing facilities occur at low longitudinal momenta of the interacting partons; to have contact with these processes we have analyzed correlations between pairs of partons of different kind, finding that, in some cases, they are strongly suppressed at low longitudinal momenta, while for other distributions they can be sizeable. For example, the effect of gluon-gluon correlations can be as large as 20 %. We have shown that these behaviors can be understood in terms of a delicate interference of non-perturbative correlations, generated by the dynamics of the model, and perturbative ones, generated by the model independent evolution procedure. Our analysis shows that at LHC kinematics two-parton correlations can be relevant in DPS, and therefore we address the possibility to study them experimentally.

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Section: Jhep10(2016)063mentioning

confidence: 99%

Section: Jhep10(2016)063mentioning

confidence: 99%

Correlations in double parton distributions: perturbative and non-perturbative effects

Rinaldi

Scopetta

Traini

et al. 2016

J. High Energ. Phys.

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“…Even if the MPI contribution is suppressed by a power of Λ 2 QCD /Q 2 with respect to the single parton interaction, where Q is the center-mass energy, it has been already observed (see, e.g., Ref. [1]). These events can be very important as a background for the search of new Physics, e.g., at the LHC.…”

Section: Introductionmentioning

confidence: 92%

Double parton correlations in Light-Front constituent quark models

Rinaldi

Scopetta

Traini

et al. 2015

EPJ Web of Conferences

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Abstract. Double parton distribution functions (dPDF) represent a tool to explore the 3D proton structure. They can be measured in high energy proton-proton and proton nucleus collisions and encode information on how partons inside a proton are correlated among each other. dPFDs are studied here in the valence quark region, by means of a constituent quark model, where two particle correlations are present without any additional prescription. This framework allows to understand the dynamical origin of the correlations and to clarify which, among the features of the results, are model independent. Use will be made of a relativistic light-front scheme, able to overcome some drawbacks of the previous calculation. Transverse momentum correlations, due to the exact treatment of the boosts, are predicted and analyzed. The role of spin correlations is also shown. Due to the covariance of the approach, some symmetries of the dPDFs are seen unambigously. For the valence sector, also the study of the QCD evolution of the model results, which can be performed safely thanks to the property of good support, has been also completed.

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“…(4) seems to be more effective [53] than the explicit solutions (6) for the phenomenological treatment because of the singular δ-like initial conditions of single distributions D j i (x, t) (the Green's functions) figuring in these solutions. The solutions presented in (6) show that in the leading logarithm approximation dPDFs are strongly correlated at the parton level; that is,…”

Section: Double Parton Distributions In the Leading Logarithm Appmentioning

confidence: 98%

“…The splash of research activity around MPI in recent years [4,5] has been stimulated by the experimental evidence for double parton scattering (DPS) in the processes producing two independently identified hard particles. Such processes have been observed in pp and pp collisions for the final states containing four jets, γ + 3 jets, and W + 2 jets by AFS [6], UA2 [7], CDF [8,9], D0 [10][11][12], AT-LAS [13], and CMS [14] Collaborations. The data on double J/ψ production [15], and single J/ψ production as a function of the event multiplicity [16] can also be successfully interpreted using DPS [17][18][19][20] and MPI models, respectively.…”

Section: Introductionmentioning

confidence: 99%