ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2009, vol. 79, p. -
Study of the process e+e-→μ+μ- in the energy region s=980, 1040-1380 MeV
The cross section of the process e+e-→μ+μ- was measured in the spherical neutral detector experiment at the VEPP-2M e+e- collider in the energy region s=980, 1040-1380 MeV. The event numbers of the process e+e-→μ+μ- were normalized to the integrated luminosity measured using e+e-→e+e- and e+e-→γγ processes. The ratio of the measured cross section to the theoretically predicted value is 1.006±0.007±0.016 and 1.005±0.007±0.018 in the first and second case, respectively. Using results of the measurements, the electromagnetic running coupling constant α in the energy region s=1040-1380MeV was obtained 1/α =134.1±0.5±1.2 and this is in agreement with theoretical expectation. © 2009 The American Physical Society.