Chiral-symmetry breaking and the ambiguity of alternative soft-pion approaches to threshold $pi$N $Yields$ $pi$$pi$N

Journal Article · Sun Nov 23 23:00:00 EST 1975 · Phys. Rev. Lett., v. 35, no. 21, pp. 1408-1411

OSTI ID:4106641

Rockmore, R

The alternative soft-pion approaches to threshold $pi$$N$$Yields$$pi$$pi$N provided by the phenomenological-Lagrangian and current-commutator theories are shown to differ only in their pion-pole contributions. Since the data for the reaction $pi$$sup -$$p$$Yields$$pi$$sup -$$pi$$sup +$n seem well fitted by the former theory for xi=0, and by the latter for xi=-1/2, where xi is the chiral- symmetry-breaking parameter introduced by Olsson and Turner, threshold total- cross-section data for this charge state will not be able to determine a unique xi value. (AIP)

• Research Organization: Department of Physics and Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824
• NSA Number: NSA-33-018697
• OSTI ID: 4106641
• Journal Information: Phys. Rev. Lett., v. 35, no. 21, pp. 1408-1411, Journal Name: Phys. Rev. Lett., v. 35, no. 21, pp. 1408-1411; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

*CHIRAL SYMMETRY-- SYMMETRY BREAKING
*PION-PROTON INTERACTIONS-- TOTAL CROSS SECTIONS
641203*
CURRENT ALGEBRA
CURRENT COMMUTATORS
LAGRANGIAN FUNCTION
MEV RANGE 100-1000
N64330* --Physics (High Energy)--Particle Invariance Principles & Symmetry--Applications (Strong)
NEUTRONS
PIONS MINUS
PIONS PLUS