THE PION-PION CROSS SECTION BY THE CHEW-LOW METHOD (thesis)
By the use of the Alvarez 72-inch hydrogen bubble chamber exposed to a 1.25-Bev/c pi plus or minus beam designed by Professor Frank Crawford, a study of the processes pi /sup +/ + p yielding p + pi/sup +/ and pi/sup -/ + p yielding p + pi/sup -/ + pi/sup 0/ was carried out. All together, 1737 pi /sup +/ and 466 pi /sup -/ events with low momentum transfer to the proton (less than 400 Mev/c) were measured. Evidence was found for a T = J = l di-pion resonance of mass 730 Mev and full width at half maximum of 150 Mev (total di-pion energy squared = 29 neutral pion masses squared). The height of the cross section by extrapolation for both the pi /sup +/ and pi /sup -/ data and in the physical region for the pi /sup +/ is consistent with (2J + l) 4 pi lambda /sup 2/ for a p-wave resonance. Angular distributions were determined in the physical region for the pi /sup +/ data. These distributions are strongly dominated by a cos/ sup 2/ theta /sub pi pi / term (s-,d-, and f-wave resonances can be ruled out by this experiment). The pi /sip -/ data do not show the dominance of the single-pion exchange process in the physical region. The cross section sigma / sub pi/-/sub pi/0 as determined by the ChewLow extrapolation method does show a resonant rise, thus indicating that the applicability of the Chew-Low method is not restricted to situations in which the physical region contains already as much information as one hopes to learn by extrapolation. (auth)
- Research Organization:
- University of California, Lawrence Radiation Laboratory, Berkeley, CA (US)
- Sponsoring Organization:
- US Atomic Energy Commission (AEC)
- DOE Contract Number:
- W-7405-ENG-48
- NSA Number:
- NSA-16-006924
- OSTI ID:
- 4819836
- Report Number(s):
- UCRL-9886
- Country of Publication:
- United States
- Language:
- English
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DETERMINATION OF $pi$-$pi$ CROSS SECTIONS BY THE CHEW-LOW EXTRAPOLATION METHOD
STUDY OF $pi$$sup -$ + p $Yields$ $pi$$sup -$ + $pi$$sup +$ + n AT 1.25 AND 1.75 Bev/c FOR LOW-NUCLEON-MOMENTUM-TRANSFER COLLISIONS: EVIDENCE FOR PION-PION INTERACTIONS (thesis)
Radiative pion-proton scattering in the static Chew--Low model
Journal Article
·
Wed Aug 01 00:00:00 EDT 1962
· Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
·
OSTI ID:4789652
STUDY OF $pi$$sup -$ + p $Yields$ $pi$$sup -$ + $pi$$sup +$ + n AT 1.25 AND 1.75 Bev/c FOR LOW-NUCLEON-MOMENTUM-TRANSFER COLLISIONS: EVIDENCE FOR PION-PION INTERACTIONS (thesis)
Technical Report
·
Tue Feb 26 23:00:00 EST 1963
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OSTI ID:4719036
Radiative pion-proton scattering in the static Chew--Low model
Technical Report
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Tue Dec 31 23:00:00 EST 1974
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OSTI ID:4134135
Related Subjects
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BEAMS
BUBBLE CHAMBERS
CHEW-LOW METHOD
CROSS SECTIONS
D-WAVE
ELEMENTARY PARTICLES
F-WAVE
FIELD THEORY
HYDROGEN
INTERACTIONS
IRRADIATION
LIFETIME
MASS
MEASURED VALUES
MOMENTUM
NUMERICALS
OPE MODEL
P-WAVE
PARTICLE MODELS
PHYSICS
PIONS
PROTONS
QUANTUM MECHANICS
RESONANCE
S-WAVE
SCATTERING
STRANGENESS
ANGULAR MOMENTUM
BEAMS
BUBBLE CHAMBERS
CHEW-LOW METHOD
CROSS SECTIONS
D-WAVE
ELEMENTARY PARTICLES
F-WAVE
FIELD THEORY
HYDROGEN
INTERACTIONS
IRRADIATION
LIFETIME
MASS
MEASURED VALUES
MOMENTUM
NUMERICALS
OPE MODEL
P-WAVE
PARTICLE MODELS
PHYSICS
PIONS
PROTONS
QUANTUM MECHANICS
RESONANCE
S-WAVE
SCATTERING
STRANGENESS