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

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Дата последнего поиска статьи во внешних источниках: 19 декабря 2016 г.

Работа с статьей


[1] Study of the production of Λ_b0 and øverlineb0 hadrons in pp collisions and first measurement of the Λ_b0jpk- branching fraction / А. В. Бережной, Н. В. Никитин, А. К. Лефлат et al. // Chinese Physics C. — 2016. — Vol. 40, no. 1. — P. 011001. 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. [ DOI ]

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