K1(1270)-K1(1400) Mixing Angle and New-Physics Effects in B to K1 l+ l- Decays

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dc.creatorHatanaka, Hisaki
dc.creatorYang, Kwei-Chou
dc.date2008-08-27
dc.date2008-09-16
dc.date.accessioned2026-07-07T11:45:39Z
dc.date.available2026-07-07T11:45:39Z
dc.descriptionWe study semileptonic B meson decays B to K_1(1270) l^+ l^- and K_1(1400) l^+ l^- (l=e, mu, tau), where the strange P-wave mesons, K_1(1270) and K_1(1400), are the mixtures of the K_{1A} and K_{1B}, which are the 1^3P_1 and 1^1P_1 states, respectively. We show that the ratio R_l = Br(B to K_1(1400) l^+ l^-)/Br(B to K_1(1270) l^+ l^-), insensitive to new-physics parameters, is suitable for determining the K_1(1270)-K_1(1400) mixing angle, theta_{K_1}. The forward-backward asymmetry shows a weak theta_{K_1}-dependence for B to K_1(1270) mu^+ mu^-, but relatively strong for B to K_1(1400) mu^+ mu^-. We investigate model-independent new-physics corrections to operators relevant to the b to s l^+ l^- electroweak-penguin and weak-box diagrams. Furthermore, for the B to K_1(1270) mu^+ mu^- decay the position of the forward-backward asymmetry zero, which is almost independent of the value of theta_{K_1}, can be dramatically changed under variation of new-physics parameters.
dc.description21 pages, 8 figures, 6 tables (v3) typos corrected, a reference added
dc.identifierhttps://arxiv.org/abs/0808.3731
dc.identifierhttp://arxiv.org/abs/0808.3731
dc.identifierPhys.Rev.D78:074007,2008
dc.identifierdoi:10.1103/PhysRevD.78.074007
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/201952
dc.subjectHigh Energy Physics - Phenomenology
dc.titleK1(1270)-K1(1400) Mixing Angle and New-Physics Effects in B to K1 l+ l- Decays
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