Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session LF: Proton Puzzles III
9:00 AM–11:15 AM,
Saturday, October 27, 2018
Hilton
Room: King's 2
Chair: Jianwei Qiu, Jefferson Lab
Abstract ID: BAPS.2018.HAW.LF.1
Abstract: LF.00001 : The Pion Cloud and the Puzzle of the Proton Sea*
9:00 AM–9:15 AM
Presenter:
Mary Alberg
(Seattle University and University of Washington)
Authors:
Mary Alberg
(Seattle University and University of Washington)
Gerald A. Miller
(University of Washington)
The light-quark flavor dependence of the proton sea has been of great interest for many years because of its close connection with non-perturbative effects. A natural explanation is that the sea arises from the pion cloud of the proton, which leads to an excess of dbar over ubar quarks. However, a theoretical explanation of the momentum dependence of the ratio of dbar to ubar measured by E866 remains a challenge. We make precise predictions, based on the pion cloud idea, for the anticipated final results of the SeaQuest experiment. This is achieved by applying light cone perturbation theory and experimental constraints to a chiral Lagrangian so that the relevant Fock-space components of the nucleon wave function are computed with reasonable accuracy. We compare our results to existing experimental information from E866, and make predictions, including uncertainties, for future experimental measurements. Future experimental results will either confirm or rule out the idea that the pion cloud provides the flavor dependence of the proton's sea quark distributions, and have profound implications for understanding the nucleon-nucleon force.
*This work is supported by the US NSF under Grant No. 1516105 and the US DOE under Grant No. DE-FG02-97ER-41014.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.HAW.LF.1
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