B, Bs -> K form factors: an update of light-cone sum rule results

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dc.creatorDuplancic, G.
dc.creatorMelic, B.
dc.date2008-05-27
dc.date2008-09-01
dc.date.accessioned2026-07-07T12:14:35Z
dc.date.available2026-07-07T12:14:35Z
dc.descriptionWe present an improved QCD light-cone sum rule (LCSR) calculation of the B -> K and Bs -> K form factors, by including SU(3)-symmetry breaking corrections. We use recently updated K-meson distribution amplitudes which incorporate the complete SU(3)-breaking structure. By applying the method of the direct integration in the complex plane, which is presented in a detail, the analytical extraction of the imaginary parts of LCSR hard-scattering amplitudes becomes unnecessary and therefore the complexity of the calculation is greatly reduced. The values obtained for the relevant B_{(s)} -> K form factors are as follows: f^+_{BK}(0)= 0.36^{+0.05}_{-0.04}, f^+_{B_sK}(0)= 0.30^{+0.04}_{-0.03} and f^T_{BK}(0)= 0.38\pm 0.05, f^T_{B_sK}(0)= 0.30\pm 0.05. By comparing with the B -> pi form factors extracted recently by the same method, we find the following SU(3) violation among the B -> light form factors: f^+_{BK}(0)/f^+_{Bπ}(0) = 1.38^{+0.11}_{-0.10}, f^+_{B_sK}(0)/f^+_{Bπ}(0) = 1.15^{+0.17}_{-0.09}, f^T_{BK}(0)/f^T_{Bπ}(0) = 1.49^{+0.18}_{-0.06} and f^T_{B_sK}(0)/f^T_{Bπ}(0) = 1.17^{+0.15}_{-0.11}.
dc.description14 pages, 9 figures, some figures and discussions added; version to appear in PRD
dc.identifierhttps://arxiv.org/abs/0805.4170
dc.identifierhttp://arxiv.org/abs/0805.4170
dc.identifierPhys.Rev.D78:054015,2008
dc.identifierdoi:10.1103/PhysRevD.78.054015
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/211243
dc.subjectHigh Energy Physics - Phenomenology
dc.titleB, Bs -> K form factors: an update of light-cone sum rule results
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