Flavor Asymmetry of the Nucleon Sea: Unambiguous Role of Goldstone Bosons

Conference · Tue Dec 12 00:00:00 EST 2000

OSTI ID:801499

Thomas, Anthony W; Melnitchouk, Wally; Steffens, Fernando M

We consider the non-analytic behavior of {bar d}(x)-{bar u}(x) and s(x)-{bar s}(x) as a function of quark mass. Using the fact that such non-analytic behavior is a unique characteristic of Goldstone boson loops, we establish two features of the nucleon sea in a model independent fashion. First, we establish the unambiguous role of the pion cloud of the nucleon in the observed excess of {bar d} over {bar u} quarks in the proton. Second, we establish that s(x) cannot in general be equal to {bar s}(x).

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 801499
• Report Number(s): JLAB-THY-00-50; DOE/ER/40150-2182; TRN: US0205497
• Resource Relation: Conference: INTERSECTIONS OF PARTICLE AND NUCLEAR PHYSICS: 7th Conference, Quebec City, Quebec (CA), 05/22/2000--05/29/2000; Other Information: AIP Conf. Proc. 549, 463 (2000); PBD: 12 Dec 2000
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMMETRY
CLOUDS
GOLDSTONE BOSONS
NUCLEAR PHYSICS
NUCLEONS
PIONS
QUARKS