Two-photon production of pion pairs

Journal Article · Sat Sep 01 00:00:00 EDT 1990 · Physical Review, D (Particles Fields); (USA)

DOI:https://doi.org/10.1103/PhysRevD.42.1350· OSTI ID:6365826

Boyer, J; Butler, F; Gidal, G; Abrams, G; Amidei, D; Baden, A R; Gold, M S; Golding, L; Goldhaber, G; Haggerty, J; Herrup, D; Juricic, I; Kadyk, J A; Levi, M E; Nelson, M E; Rowson, P C; Schellman, H; Schmidke, W B; Sheldon, P D; Trilling, G H ; Wood, D R ^[1]; Barklow, T; Boyarski, A; Burchat, P; Burke, D L; Cords, D; Dorfan, J M; Feldman, G J; Gladney, L; Hanson, G; Hayes, K; Hollebeek, R J; Innes, W R; Jaros, J A; Karlen, D; Lankford, A J; Larsen, R R; LeClaire, B W; Lockyer, N S; Lueth, V; Ong, R A; Perl, M L; Richter, B; Riles, K; Yelton, J M ^[2]; Schaad, T ^[3]

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1. Lawrence Berkeley Laboratory, University California Berkeley, CA (USA) Department of Physics, University of California, Berkeley, CA (USA)
2. Stanford Linear Accelerator Center, Stanford University, Stanford, CA (USA)
3. Harvard University, Cambridge, MA (USA)

We present a new high-statistics measurement of the cross section for the process {ital e}{sup +}{ital e}{sup {minus}}{r arrow}{ital e}{sup +}{ital e}{sup {minus}}{pi}{sup +}{pi}{sup {minus}} at a center-of-mass energy of 29 GeV for invariant pion-pair masses {ital M}({pi}{sup +}{pi}{sup {minus}}) between 350 MeV/{ital c}{sup 2} and 1.6 GeV/{ital c}{sup 2}. We observe the {ital f}{sub 2}(1270) and measure its radiative width to be 3.15{plus minus}0.04{plus minus}0.39 keV. We also observe an enhancement in the {pi}{sup +}{pi}{sup {minus}} spectrum near 1 GeV. General agreement is found with unitarized models of the {gamma}{gamma}{r arrow}{pi}{sup +}{pi}{sup {minus}} reaction that include final-state interactions.

• DOE Contract Number: AC03-76SF00515; AC03-76SF00098; AC02-76ER03064
• OSTI ID: 6365826
• Journal Information: Physical Review, D (Particles Fields); (USA), Journal Name: Physical Review, D (Particles Fields); (USA) Vol. 42:5; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

645202* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BASIC INTERACTIONS
BOSONS
CALORIMETRY
CROSS SECTIONS
DRIFT CHAMBERS
ELECTROMAGNETIC INTERACTIONS
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
F2-1270 MESONS
GEV RANGE
GEV RANGE 10-100
HADRONS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
MEASURING INSTRUMENTS
MESONS
MULTIWIRE PROPORTIONAL CHAMBERS
PAIR PRODUCTION
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PARTICLE WIDTHS
PHOTON-PHOTON INTERACTIONS
PIONS
PIONS MINUS
PIONS PLUS
PROPORTIONAL COUNTERS
PSEUDOSCALAR MESONS
RADIATION DETECTORS
TENSOR MESONS
TIME-OF-FLIGHT METHOD
UNITARITY