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Semi-leptonic decays of heavy flavours on a fine grained lattice

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Semi-leptonic decays of heavy flavours on a fine grained lattice

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dc.contributor.author	Abada, Asmaa
dc.contributor.author	Allton, C.R.
dc.contributor.author	Boucaud, Ph.
dc.contributor.author	Carpenter, D.B.
dc.contributor.author	Crisafulli, M.
dc.contributor.author	Güsken, S.
dc.contributor.author	Hernández Gamazo, Pilar
dc.contributor.author	Lubicz, V.
dc.contributor.author	Martinelli, Guido
dc.contributor.author	Pène, Olivier
dc.contributor.author	Sachrajda, Christopher T.
dc.contributor.author	Schilling, K.
dc.contributor.author	Siegert, G.
dc.contributor.author	Sommer, R.
dc.date.accessioned	2015-04-23T11:41:26Z
dc.date.available	2015-04-23T11:41:26Z
dc.date.issued	1994
dc.identifier.citation	Abada, Asmaa Allton, C.R. Boucaud, Ph. Carpenter, D.B. Crisafulli, M. Güsken, S. Hernández Gamazo, Pilar Lubicz, V. Martinelli, Guido Pène, Olivier Sachrajda, Christopher T. Schilling, K. Siegert, G. Sommer, R. 1994 Semi-leptonic decays of heavy flavours on a fine grained lattice Nuclear Physics B 416 2 675 695
dc.identifier.uri	http://hdl.handle.net/10550/43320
dc.description.abstract	We present the results of a numerical calculation of semi-leptonic form factors relevant for heavy flavour meson decays into light mesons, at β=6.4 on a 243×60 lattice, using the Wilson action in the quenched approximation. We obtain f+K(0)=0.65±0.18, V(0)=0.95±0.34, A1(0)=0.63±0.14 and A2(0)=0.45±0.33. We also obtain A1(q2max)=0.62±0.09, V(0)/A1(0)=1.5±0.28 and A2(0)/A1(0)=0.7±0.4. The results for f+K(0), V(0) and A1(0) are consistent with the experimental data and with previous lattice determinations with larger lattice spacings. In the case of A2(0) the errors are too large to draw any firm conclusion. We have also extrapolated the form factors to the B meson, showing a behaviour compatible with the predictions by the heavy quark effective theory (HQET). Within large uncertainties, our results suggest that A2/A1 increases with the heavy quark mass. We also get very rough estimates for the partial decay widths B→πlνl)=\|Vub\|2(12±8)1012s−1 and Γ(B→ρlνl)=\|Vub\|2(13±12)1012s−1, which can be used to give upper bounds on the rates.
dc.language.iso	eng
dc.relation.ispartof	Nuclear Physics B, 1994, vol. 416, num. 2, p. 675-695
dc.subject	Física
dc.title	Semi-leptonic decays of heavy flavours on a fine grained lattice
dc.type	journal article	es_ES
dc.date.updated	2015-04-23T11:41:26Z
dc.identifier.doi	10.1016/0550-3213(94)90327-1
dc.identifier.idgrec	081422
dc.rights.accessRights	open access	es_ES