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Angular distributions of leptons from J/psi's produced in 920 GeV fixed-target proton-nucleus collisionsстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Aushev V., Danilov M., Egorytchev V., Emeliyanov D., Goloubkov D., Golubkov Y., Khasanov F., Matchikhilian I., Rostovtseva I., Rybnikov V., Somov A., Somov S., Spiridonov A., Zaitsev Y., Zavertyaev M.
- Журнал: European Physical Journal C
- Том: 60
- Номер: 4
- Год издания: 2009
- Издательство: Springer Verlag
- Местоположение издательства: Germany
- Первая страница: 517
- Последняя страница: 524
- DOI: 10.1140/epjc/s10052-009-0957-7
- Аннотация: A study of the angular distributions of leptons from decays of J/psi's produced in p-C and p-W collisions at root s = 41.6 GeV has been performed in the J/psi Feynman-x region -0.34 < x(F) < 0.14 and for J/psi transverse momenta up to 5.4 GeV/c. The data were collected by the HERA-B experiment at the HERA proton ring of the DESY laboratory. The results, based on a clean selection of 2.3 x 10(5) J/psi's reconstructed in both the e(+)e(-) and mu(+)mu(-) decay channels, indicate that J/psi's are produced polarized. The magnitude of the effect is maximal at low p(T). For p(T) > 1 GeV/c a significant dependence on the reference frame is found: the polar anisotropy is more pronounced in the Collins-Soper frame and almost vanishes in the helicity frame, where, instead, a significant azimuthal anisotropy arises.
- Добавил в систему: Голубков Юрий Александрович