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Exclusive \(B \to (K^*, \rho) \gamma\) decays in general two-Higgs-doublet models

theoretical physics

Abstract.

By employing the QCD factorization approach, we calculated the next-to-leading order new physics contributions to the branching ratios, CP asymmetries, isospin and U-spin symmetry breaking of the exclusive decays \(B \to V \gamma\) (\(V = K^*, \rho\)), induced by the charged Higgs penguins in general two-Higgs-doublet models. Within the considered parameter space, we found that (a) the new physics corrections to the observables are generally small in model I and model III-A, moderate in model II, but large in model III-B; (b) from the well measured branching ratios and upper limits, a lower bound of M H > 200 GeV in model II was obtained, while the allowed range of M H in model III-B is \( 226 \leq M_{H} \leq 293 \) GeV; these bounds are comparable with those from the inclusive \(B \to X_s \gamma\) decay; (c) the NLO Wilson coefficient C 7(m b ) in model III-B is positive and disfavored by the measured value of isospin symmetry breaking \( \Delta_{0-}^{\mathrm{{exp}}} (K^*\gamma) = (3.9 \pm 4.8)\%\), but it still cannot be excluded if we take the large errors into account; (d) the CP asymmetry \(\mathcal{A}_{CP}(B \to \rho \gamma)\) in model III-B has an opposite sign to the one in the standard model (SM), which may be used as a good observable to distinguish the SM from model III-B; (e) the isospin symmetry breaking \( \Delta(\rho\gamma)\) is less than \(10\%\) in the region of \(\gamma = [ 40 \sim 70]^\circ\) preferred by the global fit result, but it can be as large as 20 to \(40\%\) in the regions of \(\gamma \leq 10^\circ\) and \(\gamma \geq 120^\circ\). The SM and model III-B predictions for \( \Delta(\rho\gamma)\) are opposite in sign for small or large values of the CKM angles; (f) the U-spin symmetry breaking \(\Delta U(K^*,\rho)\) in the SM and the general two-Higgs-doublet models is generally small in size: \(\sim 10^{-7}\).

Keywords

Symmetry Breaking Factorization Approach Physic Contribution Higgs Penguin 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin/Heidelberg 2004

Authors and Affiliations

  1. 1.Department of PhysicsNanjing Normal UniversityNanjing, JiangsuP.R. China
  2. 2.CCAST (World Laboratory)BeijingP.R. China
  3. 3.Department of PhysicsNanjing Normal UniversityNanjing, JiangsuP.R.China

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