Perturbative QCD correlations in multi-parton collisions

Blok, B.; Dokshitzer, Yu. L.; Frankfurt, L.; Strikman, M.

doi:10.1140/epjc/s10052-014-2926-z

Cited by 152 publications

(192 citation statements)

References 60 publications

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“…[40], only the homogeneus part of dPDFs evolution is implemented, for the moment being, in our scheme. According to some studies, the inhomogeneus part could play some role in this phenomenology [35,43]; its analysis is beyond the scope of the present paper.…”

Section: Analysis Of the Approach Of Ref [40]mentioning

confidence: 94%

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: Analysis Of the Approach Of Ref [40]mentioning

confidence: 94%

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 cross section is computed using the NNLO W AE production cross section and an effective multiparton interaction cross section, σ eff ¼ 15 mb, measured by ATLAS using Wjj production [92]. An uncertainty of 60% is assigned to the value of σ eff -and, correspondingly, to the DPI yields-using an estimate of σ eff ≈ 24 mb for WW production [93]. While these estimates rely on theoretical assumptions, an increase of the DPI cross section by a factor of 10 only increases the measured μ by 1%.…”

Section: Ll Extrapolation For N J ≤mentioning

confidence: 99%

Observation and measurement of Higgs boson decays toWW*with the ATLAS detector

Aad¹,

Albrand²,

Brown³

et al. 2015

Phys. Rev. D

201

225

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We report the observation of Higgs boson decays to WW Ã based on an excess over background of 6.1 standard deviations in the dilepton final state, where the Standard Model expectation is 5.8 standard deviations. Evidence for the vector-boson fusion (VBF) production process is obtained with a significance of 3.2 standard deviations. The results are obtained from a data sample corresponding to an integrated luminosity of 25 fb −1 from ffiffi ffi s p ¼ 7 and 8 TeV pp collisions recorded by the ATLAS detector at the LHC. For a Higgs boson mass of 125.36 GeV, the ratio of the measured value to the expected value of the total production cross section times branching fraction is 1.09 þ0.

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“…It should be noticed that dPDFs, calculated in momentum space, describe a system where two partons have a relative transverse momentum (± k ⊥ ). This unbalance physically arises since the difference of parton transverse momenta is not conserved between the amplitude and its complex conjugate [34,35]. Due to this unbalance, the dPDFs are not densities in this representation and they can not be interpreted as probabilistic distributions.…”

Section: The Light-front Approach and Relativistic Effectsmentioning

confidence: 99%

Relativistic effects in model calculations of double parton distribution functions

Rinaldi

Ceccopieri

2017

Phys. Rev. D

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In this paper we consider double parton distribution functions (dPDFs) which are the main non perturbative ingredients appearing in the double parton scattering cross section formula in hadronic collisions. By using recent calculation of dPDFs by means of constituent quark models within the so called Light-Front approach, we investigate the role of relativistic effects on dPDFs. We find, in particular, that the so called Melosh operators, which allow to properly convert the LF spin into the canonical one and incorporate a proper treatment of boosts, produce sizeable effects on dPDFs. We discuss specific partonic correlations induced by these operators in transverse plane which are relevant to the proton structure and study under which conditions these results are stable against variations in the choice of the proton wave function.

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Perturbative QCD correlations in multi-parton collisions

Cited by 152 publications

References 60 publications

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

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

Observation and measurement of Higgs boson decays toWW*with the ATLAS detector

Relativistic effects in model calculations of double parton distribution functions

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