Experimental determination of the π meson structure functions by the Drell-Yan mechanism

Badier, J.; Boucrot, J.; Bourotte, J.; Burgun, G.; Callot, O.; Charpentier, Ph.; Crozon, M.; Décamp, D.; Delpierre, P.; Gandois, B.; Hagelberg, R.; Hansroul, M.; Karyotakis, Y.; Kienzle, W.; Dû, P. Le; Lefrançois, J.; Leray, Th.; Maillard, J.; Matthiae, G.; Michelini, A.; Miné, P.; Rahal, G.; Runólfsson, Ö.; Siegrist, P.; Tilquin, A.; Timmermans, J.; Valentin, J.; Vanderhaghen, R.; Weisz, S.

doi:10.1007/bf01573728

Cited by 161 publications

(69 citation statements)

References 12 publications

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“…In the experimental analyses of the DrellYah pair production it is usually assumed that the sea in pion is SU(3) symmetric [7]. In this case only valence antiquark distribution would contribute to I2.…”

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confidence: 99%

Low limit on the slope ofNN? andN?? vertex form factors from deep inelastic lepton scattering

Frankfurt

Mankiewicz

Strikman

1989

Z. Physik A - Atomic Nuclei

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We elaborate and update the Thomas analysis of the restrictions on the t-dependence of the NN n and NAn vertex form factors originating from deep inelastic lepton-nucleon scattering. In particular in the case of the monopole parametrization we find the derived upper bound on the monopole mass A is A <0.5 GeV.PACS" 13.75.Gx; 13.60.HbAt present there exist a significant discrepancy between different theoretical estimates of the momentum dependence of NN n and NAn vertex form factors (see e.g. [,1]) and also between the slopes of these vertices extracted from low energy and high energy phenomena (see discussion and references in the review [23). For example, the A parameter in the often 1 used monopole fits, FN~OC(l_t/A2), varies from A ~0.6 to A = 1.4 GeV. At the same time theoretical description of a number of phenomena in terms of nonrelativistic nuclear physics, such as presence of meson soup in nuclei, the EMC effect, pion condensation in superdense nuclear matter etc., crucially depends on the value of A. Some time ago Thomas [-3] has shown that the data on the sea content of the nucleon (which are derived now from various deep inelastic processes) can be used to obtain restrictions on the t dependence of FuNs(t). The idea was that too hard NN rc form factor would result in an unacceptably large nonstrange sea in the nucleon via lepton scattering off the pion field of the nucleon (Fig.

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mentioning

confidence: 99%

Low limit on the slope ofNN? andN?? vertex form factors from deep inelastic lepton scattering

Frankfurt

Mankiewicz

Strikman

1989

Z. Physik A - Atomic Nuclei

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“…While the pion PDFs at small x values have never been directly measured, in the valence quark region the π N Drell-Yan data [13][14][15] provide strong constraints on the x dependence ofq π v for x 0.1. Interestingly, the distributions at x → 1 were observed [15] to be more consistent with a ∼ (1 − x) behavior [35][36][37][38] than with the ∼ (1 − x) 2 expectation from perturbative QCD [39] or model calculations using the Dyson-Schwinger equations (see Ref.…”

Section: Su(2) Flavor Asymmetry Of the Seamentioning

confidence: 98%

“…Because the E866 data are at relatively high x values compared with the HERA measurements, within the pion exchange framework they are sensitive to the pion PDFs at large x π , where these are well determined from pion-nucleon Drell-Yan data [13][14][15]. The main variable in describing thed −ū asymmetry is therefore the pion distribution function in the nucleon.…”

Section: Introductionmentioning

confidence: 98%

SU(2) Flavor Asymmetry of the Proton Sea in Chiral Effective Theory

McKenney¹,

Sato

Melnitchouk

et al. 2016

Few-Body Syst

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We refine the computation of thed −ū flavor asymmetry in the proton sea with a complementary effort to reveal the dynamics of pion exchange in high-energy processes. In particular, we discuss the efficacy of pion exchange models to simultaneously describe leading neutron electroproduction at HERA along with thed −ū flavor asymmetry in the proton. A detailed χ 2 analysis of the ZEUS and H1 data, when combined with constraints on the pion flux from Drell-Yan data, allows regions of applicability of one-pion exchange to be delineated. Based on the fit results, we also address a possible estimate for leading proton structure functions in upcoming tagged deep-inelastic scattering experiments at Jefferson Lab on the deuteron with forward protons.

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“…While the pion PDFs at small x values have never been directly measured, in the valence quark region the πN Drell-Yan data [8,9,10] provide strong constraints on the x dependence ofq π v for x 0.1. Interestingly, the distributions at x → 1 were observed [10] to be more consistent with a ∼ (1 − x) behavior [31,32,33] than with the ∼ (1 − x) 2 expectation from perturbative QCD [34] or model calculations using the Dyson-Schwinger equations (see Ref.…”

Section: Su(2) Flavor Asymmetry Of the Seamentioning

confidence: 99%

“…Because the E866 data are at relatively high x values compared with the HERA measurements, within the pion exchange framework they are sensitive to the pion PDFs at large x π , where these are well determined from pion-nucleon Drell-Yan data [8,9,10]. The main variable in describing thed −ū asymmetry is therefore the pion distribution function in the nucleon.…”

Section: Introductionmentioning

confidence: 99%

Pion structure function and SU(2) flavor asymmetry

Ji¹

2017

Proceedings of QCD Evolution 2016 — PoS(QCDEV2016)

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We refine the computation of thed −ū flavor asymmetry in the proton sea with a complementary effort to reveal the dynamics of pion exchange in high-energy processes. In particular, we discuss the efficacy of pion exchange models to simultaneously describe leading neutron electroproduction at HERA along with thed −ū flavor asymmetry in the proton. A detailed χ 2 analysis of the ZEUS and H1 cross sections, when combined with constraints on the pion flux from Drell-Yan data, allows regions of applicability of one-pion exchange to be delineated. The analysis disfavors several models of the pion flux used in the literature, and yields an improved extraction of the pion structure function and its uncertainties at parton momentum fractions in the pion of 4 × 10 −4 x π 0.05 at a scale of Q 2 = 10 GeV 2 . Based on the fit results, we also address a possible estimate for leading proton structure functions in upcoming tagged deep-inelastic scattering experiments at Jefferson Lab on the deuteron with forward protons.

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Experimental determination of the π meson structure functions by the Drell-Yan mechanism

Cited by 161 publications

References 12 publications

Low limit on the slope ofNN? andN?? vertex form factors from deep inelastic lepton scattering

Low limit on the slope ofNN? andN?? vertex form factors from deep inelastic lepton scattering

SU(2) Flavor Asymmetry of the Proton Sea in Chiral Effective Theory

Pion structure function and SU(2) flavor asymmetry

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