Phenomenology of nonstandard Z couplings in exclusive semileptonic b\s transitions

By G. Buchalla, G. Hiller, G. Isidori. 2000

200 citations recorded by the source corpus.

The rare decays $\stackrel{\ensuremath{\rightarrow}}{B}{K}^{(*)}{l}^{+}{l}^{\ensuremath{-}},$ $\stackrel{\ensuremath{\rightarrow}}{B}{K}^{(*)}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ and ${B}_{s}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ are analyzed in a generic scenario where new physics effects enter predominantly via Z penguin contributions. We show that this possibility is well motivated on theoretical grounds, as the $\overline{s}\mathrm{bZ}$ vertex is particularly susceptible to nonstandard dynamics. In addition, such a framework is also interesting phenomenologically since the $\overline{s}\mathrm{bZ}$ coupling is rather poorly constrained by present data. The characteristic features of this scenario for the relevant decay rates and distributions are investigated. We emphasize that both sign and magnitude of the forward-backward asymmetry of the decay leptons in $\overline{B}\ensuremath{\rightarrow}{K}^{*}{l}^{+}{l}^{\ensuremath{-}},$ ${\mathcal{A}}_{\mathrm{FB}}^{(\overline{B})},$ carry sensitive information on new physics. The observable ${\mathcal{A}}_{\mathrm{FB}}^{(\overline{B})}+{\mathcal{A}}_{\mathrm{FB}}^{(B)}$ is proposed as a useful probe of nonstandard $\mathrm{CP}$ violation in $\overline{s}\mathrm{bZ}$ couplings.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/9a57c45cd1abfe930527969eb3a8883aafc646db

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In Nuclear and High Energy Physics

Citations in the corpus

Physics at Super B Factory (2004, background): “Besides the observables mentioned above, the forward-backward CP asymmetry of b → sl+l− is useful under the presence of new source of CP violation [207].”
Rare K and B Decays in a warped extra dimension with custodial protection (2008, background): “10) The dilepton spectrum, sensitive only to |Xs|, can be found in equation (35) of [39].”
Model-independent constraints on new physics in b → s transitions (2011, methodology): “For example, in the MSSM with MFV and flavour blind phases [81], in effective SUSY with flavour blind phases [82] and in effective SUSY with a U(2)3 symmetry [83, 84], NP effects in ∆B = ∆S = 1 processes arise almost exclusively through complex contributions to C7 (and C8).”
More benefits of semileptonic rare B decays at low recoil: CP violation (2011, background): “and could make the theoretical uncertainties blow up. We note that a (1) equals the direct CP asymmetry in the rate, ACP + . Furthermore, a (2) equals A CP AFB+ AFB AFB AFB [ 19 ], the”