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dc.contributor.authorGambino, Paolo
dc.contributor.authorGardi, Einan
dc.contributor.authorRidolfi, Giovanni
dc.date.accessioned2010-01-21T15:29:52Z
dc.date.available2010-01-21T15:29:52Z
dc.date.issued2006-10
dc.identifier.urihttp://www.dspace.cam.ac.uk/handle/1810/224173
dc.description.abstractWe compute the fully–differential ¯B → Xul¯ν decay width to all orders in perturbation theory in the large–β0 limit. Each of the five structure functions that build the hadronic tensor is expressed as a Borel integral, summing up O(CF βn−1 0 αns ) corrections for any n. We derive analytic expressions for the Borel transforms of both real and virtual diagrams with a single dressed gluon, and perform an all–order infrared subtraction, where the Borel parameter serves also as an infrared regulator. Expanding the result we recover the known triple–differential NLO coefficient, and obtain an explicit expression for the O(CF β0α2s ) triple–differential NNLO correction. This result can be used to improve the determination of |Vub| from inclusive ¯B → Xul¯ν measurements at the B factories with a variety of kinematic cuts.
dc.language.isoen
dc.publisherHigh Energy Physics, Cavendish Laboratory, University of Cambridge
dc.relation.ispartofseriesCavendish-HEP-06-22
dc.rightsAll Rights Reserved
dc.rights.urihttps://www.rioxx.net/licenses/all-rights-reserved/
dc.subjectinclusive B decay, resummation, renormalons, heavy quarks.
dc.titleRunning-coupling effects in the triple-differential charmless semileptonic decay width.
dc.typeArticle
dc.type.versionnot applicable
pubs.declined2017-10-11T13:54:28.215+0100


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