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Kasemets, Aare

doi:10.2307/j.ctvddzs0t.8

Cited by 2 publications

(2 citation statements)

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“…The double parton distribution f gg represents the probability of finding two gluons with momentum fractions x 1 and x 2 at a transverse separation y. The distribution of longitudinally polarized gluons f ∆g∆g describe the difference in probability between finding the two gluons with their helicities aligned rather than anti-aligned, while linearly polarized gluons are described by helicity interference distributions, see for example [26,28] in the context of DPS.…”

Section: Double Gluon Distributionsmentioning

confidence: 99%

Polarization effects in double open-charm production at LHCb

Echevarría

Kasemets

Mulders

et al. 2015

J. High Energ. Phys.

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Double open-charm production is one of the most promising channels to disentangle single from double parton scattering (DPS) and study different properties of DPS. Several studies of the DPS contributions have been made. A missing ingredient so far has been the study of polarization effects, arising from spin correlations between the two partons inside an unpolarized proton. We investigate the impact polarization has on the double open-charm cross section. We show that the longitudinally polarized gluons can give significant contributions to the cross section, but for most of the considered kinematic region only have a moderate effect on the shape. We compare our findings to the LHCb data in the D 0 D 0 final state, identify observables where polarization does have an impact on the distribution of the final state particles, and suggest measurements which could lead to first experimental indications of, or limits on, polarization in DPS.

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Section: Double Gluon Distributionsmentioning

confidence: 99%

Polarization effects in double open-charm production at LHCb

Echevarría

Kasemets

Mulders

et al. 2015

J. High Energ. Phys.

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“…The rapid growth in the density of partons with energy leads to a rapid increase of DPS cross sections, which intuitively increases as the parton density to the power of four. The description of DPS has seen important improvements over the last couple of years, moving towards a reliable treatment within perturbative QCD (see for example [1][2][3][4]). Several ingredients in a proof of factorization have been established where the two hard subprocesses are calculated perturbatively, while the long distance physics is captured in double parton distributions (DPDs) [5,6].…”

Section: Introductionmentioning

confidence: 99%

Constraining double-parton correlations and interferences

Kasemets

Mulders

2015

Phys. Rev. D

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Double parton scattering (DPS) has become very relevant as a background to interesting analyses performed by the experiments at the LHC. It encodes knowledge of correlations between the proton constituents not accessible in single parton scattering. Within perturbative QCD DPS is described in terms of partonic subprocesses and double parton distributions (DPDs). There exists a large number of different DPDs describing the different possible states of two partons inside a proton. They include correlations between the two partons and interferences between the two hard subprocesses. Taking the probability interpretation of the DPDs as starting point, we derive limits on the interference DPDs and thereby constrain the size of correlations between two partons inside an unpolarized proton.

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Top of the Class.

Cited by 2 publications

References 0 publications

Polarization effects in double open-charm production at LHCb

Polarization effects in double open-charm production at LHCb

Constraining double-parton correlations and interferences

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