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Study of the production of $Λ_b^0$ and $øverlineB^0$ hadrons in $pp$ collisions and first measurement of the $Λ_b^0\rightarrow J/ψ pK^-$ branching fractionстатья
Статья опубликована в высокорейтинговом журнале
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: 19 декабря 2016 г.
- Авторы: Бережной А.В., Никитин Н.В., Лефлат А.К., Волков В.Ю., Саврина Д.В., LHCb Collaboration
- Журнал: Chinese Physics C
- Том: 40
- Номер: 1
- Год издания: 2016
- Издательство: IOP Publishing
- Местоположение издательства: [Bristol, UK], England
- Первая страница: 011001
- DOI: 10.1088/1674-1137/40/1/011001
- Аннотация: The product of the Λ0b (B¯¯¯¯0) differential production cross-section and the branching fraction of the decay Λ0b→J/ψpK− (B¯¯¯¯0→J/ψK¯¯¯¯¯∗(892)0) is measured as a function of the beauty hadron transverse momentum, pT, and rapidity, y. The kinematic region of the measurements is pT<20GeV/c and 2.0<y<4.5. The measurements use a data sample corresponding to an integrated luminosity of 3fb−1 collected by the LHCb detector in pp collisions at centre-of-mass energies s√=7TeV in 2011 and s√=8TeV in 2012. Based on previous LHCb results of the fragmentation fraction ratio, fΛ0B/fd, the branching fraction of the decay Λ0b→J/ψpK− is measured to be B(Λ0b→J/ψpK−)=(3.17±0.04±0.07±0.34+0.45−0.28)×10−4, where the first uncertainty is statistical, the second is systematic, the third is due to the uncertainty on the branching fraction of the decay B¯¯¯¯0→J/ψK¯¯¯¯¯∗(892)0, and the fourth is due to the knowledge of fΛ0b/fd. The sum of the asymmetries in the production and decay between Λ0b and Λ¯¯¯¯0b is also measured as a function of pT and y. The previously published branching fraction of Λ0b→J/ψpπ−, relative to that of Λ0b→J/ψpK−, is updated. The branching fractions of Λ0b→P+c(→J/ψp)K− are determined.
- Добавил в систему: Бережной Александр Викторович