Open charm production in double parton scattering processes in the forward kinematics

Blok, B.; Strikman, M.

doi:10.1140/epjc/s10052-016-4551-5

Cited by 17 publications

(16 citation statements)

References 59 publications

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“…The enhancement due to the perturbative QCD correlation 1 ⊗ 2 mechanism which explains the rate of double parton interactions at the central rapidities is found to explain 60 ÷ 80 % of the discrepancy. We find [27] that non-factorized contributions to the initial conditions for the DGLAP collinear evolution of the double parton GPD discussed above play an important role in this kinematics. Combined, the two correlation mechanisms provide a good description of the rate of double charm production reported by the LHCb [37] with the result weakly sensitive to to the starting point of the QCD evolution.…”

Section: A Basic Ideasmentioning

confidence: 71%

Multiparton pp and pA Collisions: From Geometry to Parton–Parton Correlations

Blok

Strikman²

2018

Multiple Parton Interactions at the LHC

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We derive expressions for the cross section of the multiparton interactions based on the analysis of the relevant Feynman diagrams. We express the cross sections through the double (triple, ...) generalized parton distributions (GPDs). In the mean field approximation for the double GPDs the answer is expressed through the integral over two gluon form factor which was measured in the exclusive DIS vector meson production. We explain under what conditions the derived expressions correspond to an intuitive picture of hard interactions in the impact parameter representation. The mean field approximation in which correlations of the partons are neglected fail to explain the data, while pQCD induced correlation enhance large p ⊥ and 0.001 < x < 0.1 typically enhance the cross section by a factor of 1.5 -2 explaining the current data. We argue that in the small x kinematics (10 −4 ≤ x ≤ 10 −3 ) where effects of perturbative correlations diminish, the nonperturbative mechanism kicks in and generates positive correlations comparable in magnitude with the perturbative ones. We explain how our technique can be used for calculations of MPI in the protonnucleus scattering. The interplay of hard interactions and underlying event is discussed, as well as different geometric pictures for each of MPI mechanisms-pQCD, nonperturbative correlations and mean field. Predictions for value of σ eff for various processes and a wide range of kinematics are given. We show that together different MPI mechanisms give good description of experimental data, both at Tvatron, and LHC, including the central kinematics studied by ATLAS and CMS detectors, and forward (heavy flavors) kinematics studied by LHCb. † To be published in "Multiple parton Interactions at the LHC", P. Bartalini and J. Gaunt eds, World Scientific

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Section: A Basic Ideasmentioning

confidence: 71%

Multiparton pp and pA Collisions: From Geometry to Parton–Parton Correlations

Blok

Strikman²

2018

Multiple Parton Interactions at the LHC

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“…Figures 6 and 7 compare the EHM outputs from the solution of FKP [22][23][24][25] with the target ones. The maximum absolute error of the angle around X-, Y-, and Zaxis is of the order of 10 23 units and its relative error is about 1.9%.…”

Section: Bench Test and Results Analysismentioning

confidence: 99%

Efficient hybrid method for forward kinematics analysis of parallel robots based on signal decomposition and reconstruction

Wang

et al. 2017

Advances in Mechanical Engineering

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This article combines a new method based on signal decomposition and reconstruction with a fifth-order numerical algorithm and proposes an efficient hybrid method for solving forward kinematics problem of parallel manipulators. In this hybrid method, new method can first generate an approximate solution of the forward kinematics problem, which will be taken as initial guess for the fifth-order numerical technique. The answer with desired level of accuracy is then obtained. The superposition principle is proposed stating that each rod's displacement required to drive the mobile platform with 6-degree-of-freedom coupled motion is approximately a sum of the rod's displacement required to drive it with each of six single basic motions including roll q 1 , pitch q 2 , yaw q 3 , surge q 4 , sway q 5 , and heave q 6 . By solving the equations established in accordance with the superposition principle, the approximate solution is also gained. Superposition principle is more applicable to the robots with small rotational workspace. The solution is directly solved under superposition principle. Even though the rotational workspace is expanded, the solution still meets the required accuracy of initial value of high-order iterative technique for obtaining its exact solution. The proposed method is then applied to a test bench for bogie parameters and a Stewart platform. Simulation results demonstrate that maximum absolute error of displacement along X-, Y-, and Z-axis is 0.174 mm and its relative error is about 3.4&. Using this method will reduce about 34.1% of the required number of iterations to solve the forward kinematics problem compared with improved hybrid method and up to 49.8% compared with the Newton-Raphson method.

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“…This offers possibilities to test e.g. the heavyquark vs. heavy-antiquark asymmetries [33] and, in particular, Email addresses: ilkka.m.helenius@jyu.fi (Ilkka Helenius), hannu.paukkunen@jyu.fi (Hannu Paukkunen) to study the double-parton scattering (DPS) [34,35,36,37,38]. While the formal theory of factorization in DPS has recently advanced significantly [39,40,41], we still know relatively little of the non-perturbative structure of e.g.…”

Section: Introductionmentioning

confidence: 99%

Double D-meson production in proton-proton and proton-lead collisions at the LHC

Helenius

Paukkunen

2020

Physics Letters B

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We consider the simultaneous production of two heavy-flavoured hadrons -particularly D mesons -at the LHC. We base our calculations on collinearly factorized QCD at next-to-leading order, using the contemporary parton distribution functions and Dmeson fragmentation functions. The contributions of double-parton scatterings are included in the approximation of independent partonic interactions. Our framework benchmarks well with the available proton-proton data from the LHCb collaboration giving us confidence to make predictions for proton-lead collisions. Our results indicate that the double D-meson production in proton-lead collisions should be measurable at the LHCb kinematics with the already collected Run-II data, and should provide evidence for double-parton scattering at perturbative scales with a nuclear target.

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Open charm production in double parton scattering processes in the forward kinematics

Cited by 17 publications

References 59 publications

Multiparton pp and pA Collisions: From Geometry to Parton–Parton Correlations

Multiparton pp and pA Collisions: From Geometry to Parton–Parton Correlations

Efficient hybrid method for forward kinematics analysis of parallel robots based on signal decomposition and reconstruction

Double D-meson production in proton-proton and proton-lead collisions at the LHC

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