APS » PROLA » Phys. Rev. D » Volume 58 » Issue 9

Phys. Rev. D 58, 092004 (1998) [5 pages]

d̅ /ū asymmetry and the origin of the nucleon sea
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J. C. Peng et al. (FNAL E866/NuSea Collaboration)
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Received 10 April 1998; published 30 September 1998

The Drell-Yan cross section ratios, σ(p+d)/σ(p+p), measured in Fermilab E866, have led to the first determination of d̅ (x)/ū(x), d̅ (x)-ū(x), and the integral of d̅ (x)-ū(x) for the proton over the range 0.02<~x<~0.345. The E866 results are compared with predictions based on parton distribution functions and various theoretical models. The relationship between the E866 results and the NMC measurement of the Gottfried integral is discussed. The agreement between the E866 results and models employing virtual mesons indicates that these non-perturbative processes play an important role in the origin of the d̅ ,ū asymmetry in the nucleon sea.


©1998 The American Physical Society

URL: http://link.aps.org/abstract/PRD/v58/e092004
DOI: 10.1103/PhysRevD.58.092004
PACS: 13.85.Qk, 11.55.Hx, 12.39.Ki, 24.85.+p

* Present address: University of Illinois at Urbana-Champaign, Urbana, IL 61801.
† Also with University of Texas, Austin, TX 78712.
‡ On leave from Kurchatov Institute, Moscow 123182, Russia.

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