Resolution of an ambiguity in alternative soft-pion approaches to. pi. N. --> pi pi. N near threshold

Journal Article · Sun Feb 06 23:00:00 EST 1977 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.38.296· OSTI ID:7124276

Olsen, M G; Osypowski, E T; Turner, L

A recent observation that the current-commutator and effective-Lagrangian results differ for low-energy pion production is discussed. A simple unitarity argument shows that the commutator results are calculated is incorrect. The present status of ..pi pi.. scattering lengths determined by threshold pion production is reviewed. The s-wave scattering lengths, in inverse pion masses, are found to be a/sub 0/=0.24 +- 0.03 and a/sub 2/=-0.03 +- 0.015.

• Research Organization: Physics Department, University of Wisconsin, Madison, Wisconsin 53706
• OSTI ID: 7124276
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 38:6; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
COMMUTATORS
CURRENT COMMUTATORS
ELEMENTARY PARTICLES
FUNCTIONS
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
LAGRANGIAN FUNCTION
LOW-ENERGY THEOREM
MATHEMATICAL OPERATORS
MESON-BARYON INTERACTIONS
MESON-MESON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
PARTIAL WAVES
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PION-NUCLEON INTERACTIONS
PION-PION INTERACTIONS
PIONS
PSEUDOSCALAR MESONS
QUANTUM OPERATORS
S WAVES
SCATTERING LENGTHS
UNITARITY