Phase of direct [ital CP] violation from threshold pion production

Journal Article · Mon Nov 01 04:00:00 EST 1993 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.48.4076· OSTI ID:6132874

Chell, E; Olsson, M G ^[1]

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1. Department of Physics, University of Wisconsin, Madison, WI 53706 (United States)

A recent series of experiments on pion production near threshold provides accurate values of the [ital s]-wave [pi]-[pi] isospin scattering lengths. Combined with dispersion relations we find the [ital s]-wave phase shift difference at the [ital K] mass is [delta][sub 0][minus][delta][sub 2]=42[plus minus]4[degree] and the phase of direct [ital CP] violation is arg[var epsilon][prime]=[pi]/2[minus]([delta][sub 0][minus][delta][sub 2])=48[plus minus]4[degree]. We also evaluate the [ital p]-wave scattering length to be [ital a][sub 1]=0.035 [plus minus]0.001[ital m][sub [pi]][sup [minus]3].

• DOE Contract Number: AC02-76ER00881
• OSTI ID: 6132874
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 48:9; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662120 -- General Theory of Particles & Fields-- Symmetry
Conservation Laws
Currents & Their Properties-- (1992-)
662340* -- Hadron Interactions-- (1992-)
662420 -- Properties of Mesons & Meson Resonances-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
CP INVARIANCE
DIMENSIONS
DISPERSION RELATIONS
ELEMENTARY PARTICLES
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
INVARIANCE PRINCIPLES
LENGTH
MESON-MESON INTERACTIONS
MESONS
P WAVES
PARTIAL WAVES
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHASE SHIFT
PION-PION INTERACTIONS
PIONS
PSEUDOSCALAR MESONS
S WAVES
SCATTERING LENGTHS
VIOLATIONS