Lightest scalar and tensor resonances in {gamma}{gamma}{yields}{pi}{pi} after the Belle experiment
- Laboratory of Theoretical Physics, S.L. Sobolev Institute for Mathematics, 630090, Novosibirsk (Russian Federation)
New high statistics Belle data on the {gamma}{gamma}{yields}{pi}{sup +}{pi}{sup -} reaction cross section measured in the range of pion-pair invariant masses {radical}(s) between 0.8 GeV and 1.5 GeV are analyzed to clarify the current situation around the {sigma}(600), f{sub 0}(980), and f{sub 2}(1270) resonances in {gamma}{gamma} collisions. The present analysis shows that the direct coupling constants of the {sigma}(600) and f{sub 0}(980) resonances to {gamma}{gamma} are small, and the {sigma}(600){yields}{gamma}{gamma} and f{sub 0}(980){yields}{gamma}{gamma} decays are four-quark transitions caused by the {pi}{sup +}{pi}{sup -} and K{sup +}K{sup -} loop mechanisms, respectively. The chiral shielding of the {sigma}(600) resonance takes place in the reactions {gamma}{gamma}{yields}{pi}{pi} as well as in {pi}{pi} scattering. Some results of a simultaneous description of the {gamma}{gamma}{yields}{pi}{sup +}{pi}{sup -} and {gamma}{gamma}{yields}{pi}{sup 0}{pi}{sup 0} Belle data are also presented. In particular, the following tentative estimate of the f{sub 2}(1270){yields}{gamma}{gamma} decay width is obtained: {gamma}{sub f{sub 2}}{sub {r_reversible}}{sub {gamma}}{sub {gamma}}(m{sub f{sub 2}}{sup 2}){approx_equal}3.68 keV.
- OSTI ID:
- 21249945
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 77, Issue 7; Other Information: DOI: 10.1103/PhysRevD.77.074020; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHIRALITY
COLLISIONS
COUPLING CONSTANTS
CROSS SECTIONS
F0-980 MESONS
F2-1270 MESONS
GAMMA RADIATION
GEV RANGE 01-10
KAONS MINUS
KAONS PLUS
KEV RANGE 01-10
MASS
PARTICLE DECAY
PHOTON-PHOTON INTERACTIONS
PION-PION INTERACTIONS
PIONS MINUS
PIONS PLUS
QUARKS
RESONANCE
SHIELDING