Inclusive Charm Production in Upsilon(nS) Decay

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dc.creatorKang, Daekyoung
dc.creatorKim, Taewon
dc.creatorLee, Jungil
dc.creatorYu, Chaehyun
dc.date2007-07-27
dc.date2007-12-30
dc.date.accessioned2026-07-07T11:18:11Z
dc.date.available2026-07-07T11:18:11Z
dc.descriptionBased on the NRQCD factorization formalism, we calculate the inclusive charm production rate in Upsilon(nS) decay at leading order in the strong coupling constant alpha_s and the relative velocity v of the b quark in the quarkonium rest frame. The branching fractions for Upsilon(nS) to charm for n=1, 2, and 3 are all around 7-9%. About 60% of the branching fraction into charm is from annihilation of the color-singlet bb-bar pair into gamma^* -> cc-bar. Most of the remaining branching fraction is from annihilation of the color-singlet bb-bar pair decaying into cc-bar gg. We also compute the momentum distributions of the charm quark and charmed hadrons in the decays. The virtual-photon contribution to the charm quark momentum distribution is concentrated at the end point while the cc-bar gg contribution is broad. The momentum distributions for charmed hadrons are obtained by convolving the charm-quark momentum distribution with charm fragmentation functions. This makes the momentum distributions for charmed hadrons softer than that for the charm quark. This effect is particularly significant in the virtual-photon contribution.
dc.description27 pages, 5 figures, minor corrections. version published in Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/0707.4056
dc.identifierhttp://arxiv.org/abs/0707.4056
dc.identifierPhys.Rev.D76:114018,2007
dc.identifierdoi:10.1103/PhysRevD.76.114018
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/193259
dc.subjectHigh Energy Physics - Phenomenology
dc.titleInclusive Charm Production in Upsilon(nS) Decay
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