Study of charmonium production in [Formula omitted]-hadron decays and first evidence for the decay [Formula omitted]

Using decays to [Formula omitted]-meson pairs, the inclusive production of charmonium states in [Formula omitted]-hadron decays is studied with pp collision data corresponding to an integrated luminosity of [Formula omitted], collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV...

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Bibliographic Details
Published in:	The European physical journal. C, Particles and fields Particles and fields, 2017-09, Vol.77 (9)
Main Authors:	Aaij, R, Adeva, B, Adinolfi, M, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F
Format:	Article
Language:	eng
Online Access:	Get full text
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Summary:	Using decays to [Formula omitted]-meson pairs, the inclusive production of charmonium states in [Formula omitted]-hadron decays is studied with pp collision data corresponding to an integrated luminosity of [Formula omitted], collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. Denoting by [Formula omitted] the inclusive branching fraction of a [Formula omitted] hadron to a charmonium state C that decays into a pair of [Formula omitted] mesons, ratios [Formula omitted] are determined as [Formula omitted], [Formula omitted], [Formula omitted], [Formula omitted], [Formula omitted] and [Formula omitted]. Here and below the first uncertainties are statistical and the second systematic. Upper limits at 90% confidence level for the inclusive production of X(3872), X(3915) and [Formula omitted] states are obtained as [Formula omitted], [Formula omitted] and [Formula omitted]. Differential cross-sections as a function of transverse momentum are measured for the [Formula omitted] and [Formula omitted] states. The branching fraction of the decay [Formula omitted] is measured for the first time, [Formula omitted]. Here the third uncertainty is due to the branching fraction of the decay [Formula omitted], which is used for normalization. No evidence for intermediate resonances is seen. A preferentially transverse [Formula omitted] polarization is observed. The measurements allow the determination of the ratio of the branching fractions for the [Formula omitted] decays to [Formula omitted] and [Formula omitted] as [Formula omitted].
ISSN:	1434-6044 1434-6052