ELEMENTARY PARTICLE INTERACTIONS
\ˌɛlɪmˈɛntəɹi pˈɑːtɪkə͡l ˌɪntəɹˈakʃənz], \ˌɛlɪmˈɛntəɹi pˈɑːtɪkəl ˌɪntəɹˈakʃənz], \ˌɛ_l_ɪ_m_ˈɛ_n_t_ə_ɹ_i p_ˈɑː_t_ɪ_k_əl ˌɪ_n_t_ə_ɹ_ˈa_k_ʃ_ə_n_z]\
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The interactions of particles responsible for their scattering and transformations (decays and reactions). Because of interactions, an isolated particle may decay into other particles. Two particles passing near each other may transform, perhaps into the same particles but with changed momenta (elastic scattering) or into other particles (inelastic scattering). Interactions fall into three groups: strong, electromagnetic, and weak. (From McGraw-Hill Encyclopedia of Science & Technology, 7th ed)
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