$\bar{d}-\bar{u}$ asymmetry in the proton in chiral effective theory

Abstract

We compute the $\bar{d}-\bar{u}$ asymmetry in the proton in chiral effective theory, including both nucleon and $\Delta$ degrees of freedom, within both the relativistic and heavy baryon frameworks. In addition to the distribution at $x>0$, we compute the corrections to the asymmetry arising from zero momentum contributions from pion rainbow and bubble diagrams at $x=0$, which have not been accounted for in previous analyses. We find that the empirical $x$ dependence of $\bar{d}-\bar{u}$ as well as the integrated asymmetry can be well reproduced in terms of a transverse momentum cutoff parameter.

5 pages, 3 figures; minor typos corrected; version published in PRL

References in corpus (5)

• Chiral Perturbation Theory and Baryon Properties
• Novel Phenomenology of Parton Distributions from the Drell-Yan Process
• Chiral Perturbation Theory and the first moments of the Generalized Parton Distriputions in a Nucleon
• Flavor Asymmetry of the Nucleon Sea and the Five-Quark Components of the Nucleons
• Pion momentum distributions in the nucleon in chiral effective theory

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