tailieunhanh - Axion production in unpolarized and polarized ye− collision

Axion production ina Axion production in unpolarized and polarized ye− collision are considered in detail using the Feynman diagram method. The cross-sections are presented and numerical evaluations are given. The results show that the axion can be dark matter of the universe. Some estimates for experimental conditions are given from our results. unpolarized and polarized ye− collision | JOURNAL OF SCIENCE OF HNUE Interdisciplinary Science 2013 Vol. 58 No. 5 pp. 11-16 This paper is available online at http AXION PRODUCTION IN UNPOLARIZED AND POLARIZED γe COLLISION Dao Thi Le Thuy and Le Nhu Thuc Faculty of Physics Hanoi National University of Education Abstract. Axion production in unpolarized and polarized γe collision are considered in detail using the Feynman diagram method. The cross-sections are presented and numerical evaluations are given. The results show that the axion can be dark matter of the universe. Some estimates for experimental conditions are given from our results. Keywords Axion axino DCS TCS. 1. Introduction The strong CP problem is a big unexplained mistery in the Standard Model of particle physics. Among the various candidate solutions that have been proposed thus far the Peccei-Quinn mechanism is the most attractive candidate as a solution of the strong CP problem where the CP-violating phase θ θ 6 10 9 is explained by the existence of a new pseudo-scalar field called the axion 8 . At present axion mass is constrained by laboratory 5 astrophysical and cosmological considerations 12 13 to between 10 6 eV and 10 3 eV. If the axion has a mass near the low limit of order 10 5 eV it is a good candidate for the dark matter of the universe. In addition an axino the fermionic partner of the axion naturally appears in SUSY models 4 which acquires a mass from three-loop Feynman diagrams in a typical range of between a few eV to a maximum of 1 keV 14 . Candidates for dark matter can appear in different models such as the 3-3-1 models 7 or in supersymmetric and superstring theories 2 . Light particles with a two photon interaction can be transformed into photons in an external electric or magnetic field by an effect first discussed by Primakoff 9 . This effect is the basis of Sikivie s methods for the detection of axions in a resonant cavity 10 . Various terrestrial experiments to detect invisible axions by making use .