Probing the pion sea with π-D Drell-Yan processes

Londergan, J. T.; Liu, G.Q.; Rodionov, E.N.; Thomas, A. W.

doi:10.1016/0370-2693(95)01132-a

Cited by 28 publications

(31 citation statements)

References 19 publications

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“…The phenomenological consequences of an asymmetric pion sea for Drell-Yan πN and other processes will be discussed in more detail elsewhere [45] -see also Ref. [46] for a discussion of measurements which would be sensitive to such an asymmetry. Going beyond explanations involving meson clouds, one can also investigate the possibility that the bare nucleon itself could be asymmetric with respect toū andd.…”

Section: Chiral Symmetry and The Meson Cloudmentioning

confidence: 99%

Dynamics of light antiquarks in the proton

1998

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We present a comprehensive analysis of the recent data from the E866 experiment at Fermilab on Drell-Yan production in pD and pp collisions, which indicates a non-trivial x-dependence for the asymmetry between ū and d quark distributions in the proton. The relatively fast decrease of the asymmetry at large x suggests the important role played by the chiral structure of the nucleon, in particular the πN and π∆ components of the nucleon wave function. At small x the data require an additional non-chiral component, which may be attributed to the Pauli exclusion principle, as first suggested by Field and Feynman.

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Section: Chiral Symmetry and The Meson Cloudmentioning

confidence: 99%

Dynamics of light antiquarks in the proton

1998

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“…Future experiments should clarify this uncertainty. A precise determination of the pion sea quark distribution may be possible by using the pion-deuteron Drell-Yan experiment [40].…”

Section: Sea Quark Distributions In the Pion And The Nucleonmentioning

confidence: 99%

Chiral constituent quarks and their role in quark distribution functions of nucleon and pion

Suzuki

Weise

1998

Nuclear Physics A

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We investigate the structure of constituent quarks and study implications for quark distribution functions of hadrons. Constituent quarks are constructed by dressing bare quarks with Goldstone bosons using the chiral quark model. We calculate resulting corrections to the twist-2 structure functions f 1 (x), g 1 (x) and h 1 (x). The Goldstone boson fluctuations produce a flavor asymmetry of the quark distribution in the nucleon in agreement with experimental data. They also generate significant depolarization effects which reduce the fraction of the nucleon spin carried by quarks. Corrections to the transversity spin structure function h 1 (x) differ from those to g 1 (x), and in particular we find a large reduction (40%) of the d-quark tensor charge, which is consistent with recent lattice calculations. We also study the pion structure function and find the momentum fraction carried by the sea quarks in the pion to be considerably larger than that in the nucleon.

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“…The disadvantages of this method are that the attainable luminosity is low and that only the valence part of the pion structure function at rather large x ( ≥ 0.2) can be studied -see however [111]. An extension of our knowledge of the pion structure function is possible by using the virtual pions of the meson cloud around the proton as targets in deep-inelastic scattering [70].…”

Section: Mesons In the Proton As Targets For Deep-inelastic Scatterlngmentioning

confidence: 97%