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Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phrvd..33..897r&link_type=abstract
Physical Review D (Particles and Fields), Volume 33, Issue 4, 15 February 1986, pp.897-909
Other
113
Elementary Particle Processes
Scientific paper
``Invisible axions'' could be produced in stellar interiors through Compton- and Primakoff-type photoproduction and through bremsstrahlung processes. We point out that in a plasma screening effects lead to important reductions of these emission rates. Limits on the axion mass and interaction strength are thereby relaxed to values less restrictive than limits previously thought to be firm. For the case of the Sun the Primakoff rate is reduced by two orders of magnitude. This process is the dominant emission mechanism for Kim-Shifman-Vainshtein-Zakharov- (KSVZ) type axions which do not couple directly to electrons. The mass limit is then relaxed by an order of magnitude to ma<20 eV. Dine-Fischler-Srednicki (DFS) axions couple directly to electrons and the dominant solar emission process becomes bremsstrahlung from electron-nucleus and electron-electron collisions while the previously thought dominant Primakoff rate is now suppressed. The mass limit accidentally remains at ma<3 eV. Model-dependent bounds based on axion emission from red giants are ma<1 eV (KSVZ) and ma<0.06 eV (DFS). The mass limits for the DFS axions are understood for the special case where the free parameter 2 cos2β of the model equals unity. Our results can be easily translated to other hypothetical pseudoscalar particles if they are light compared with typical stellar temperatures.
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