Вы находитесь на старом сайте НГУ. Перейти на новый сайт

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

Achasov M. N., Aulchenko V. M., Beloborodov K. I., Berdyugin A. V., Bogdanchikov A. G., Bukin A. D., Bukin D. A., Dimova T. V., Druzhinin V. P., Golubev V. B., Koop I. A., Korol A. A., Koshuba S. V., Lysenko A. P., Pakhtusova E. V., Perevedentsev E. A., Serednyakov S. I., Shatunov Yu M., Silagadze Z. K., Skrinsky A. N., Tikhonov Yu A., Vasiljev A. V.

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.