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A Measurement of the psi ' to J/psi production ratio in 920 GeV proton-nucleus interactionsстатья
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: 49
- Номер: 2
- Год издания: 2007
- Издательство: Springer Verlag
- Местоположение издательства: Germany
- Первая страница: 545
- Последняя страница: 558
- DOI: 10.1140/epjc/s10052-006-0139-9
- Аннотация: Ratios of the psi' over the J/psi production cross sections in the dilepton channel for C, Ti and W targets have been measured in 920 GeV proton-nucleus interactions with the HERA-B detector at the HERA storage ring. The psi' and J/psi states were reconstructed in both the mu(+) mu(-) and the e(+) e(-) decay modes. The measurements covered the kinematic range -0.35 <= x(F)<= 0.1 with transverse momentum >= 4.5 GeV/c. The angular dependence of the ratio has been used to measure the difference of the psi' and J/psi polarization. All results for the muon and electron decay channels are in good agreement: their ratio, averaged over all events, is R-psi'(mu)/R-psi'(e)=1.00 +/- 0.08 +/- 0.04. This result constitutes a new, direct experimental constraint on the double ratio of branching fractions, (B' (mu)B(e))/(B(mu)B'(e)), of psi' and J/psi in the two channels. The psi' to J/psi production ratio is almost constant in the covered x(F) range and shows a slow increase with p(T).
- Добавил в систему: Голубков Юрий Александрович