Annihilation-type charmless radiative decays of B meson in non-universal Z′ model

Juan Hua; C.S. Kim; Ying Li

doi:10.1140/epjc/s10052-010-1395-2

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2023 Impact factor 4.2

Particles and Fields

Eur. Phys. J. C 69, 139-146 (2010)
https://doi.org/10.1140/epjc/s10052-010-1395-2

Annihilation-type charmless radiative decays of B meson in non-universal Z′ model

Juan Hua¹, C.S. Kim² and Ying Li¹^,2

¹ Department of Physics, Yantai University, Yantai, 264-005, China
² Department of Physics and IPAP, Yonsei University, Seoul, 120-479, Korea

cskim@yonsei.ac.kr

Received: 1 June 2010
Published online: 3 August 2010

Abstract

We study charmless pure annihilation type radiative B decays within the QCD factorization approach. After adding the vertex corrections to the naive factorization approach, we find that the branching ratios of $\overline{B}^{0}_{d}\to\phi\gamma$ , $\overline{B}^{0}_{s}\to\rho^{0}\gamma$ and $\overline{B}^{0}_{s}\to\omega\gamma$ within the standard model are at the order of $\mathcal{O}(10^{-12})$ , $\mathcal{O}(10^{-10})$ and $\mathcal{O}(10^{-11})$ , respectively. The smallness of these decays in the standard model makes them sensitive probes of flavor physics beyond the standard model. To explore their physics potential, we have estimated the contribution of Z′ boson in the decays. Within the allowed parameter space, the branching ratios of these decay modes can be enhanced remarkably in the non-universal Z′ model: The branching ratios can reach to $\mathcal{O}(10^{-8})$ for $\overline{B}_{s}^{0}\to \rho^{0}(\omega)\gamma$ and $\mathcal{O}(10^{-10})$ for the $\overline{B}_{d}^{0}\to \phi \gamma$ , which are large enough for LHC-b and/or Super B-factories to detect those channels in near future. Moreover, we also predict large CP asymmetries in suitable parameter space. The observation of these modes could in turn help us to constrain the Z′ mass within the model.