%0 Journal Article
%T Anomalous (t q photon) coupling effects in exclusive radiative B-meson decays
%A Li, X. Q.
%A Yang, Y. D.
%A Yuan, X. B.
%J Journal of High Energy Physics
%D 2011
%V 08
%N 8
%I Springer
%@ 1126-6708
%G English
%F Li_etal2011
%O WOS:000294901400007
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=773), last updated on Sun, 16 Dec 2012 18:37:42 +0000
%X The top-quark FCNC processes will be searched for at the CERN LHC, which are correlated with the B-meson decays. In this paper, we study the e ff ects of top-quark anomalous interactions tq gamma in the exclusive radiative B --> K*gamma and B --> rho gamma decays. With the current experimental data of the branching ratios, the direct CP and the isospin asymmetries, bounds on the coupling kappa(gamma)(tcR) from B --> K*gamma and kappa(gamma)(tuR) from B --> rho gamma decays are derived, respectively. The bound on vertical bar kappa(gamma)(tcR)vertical bar from B (B --> K*gamma) is generally compatible with that from B (B --> X(s)gamma). However, the isospin asymmetry Delta (K*gamma) further restrict the phase of kappa(gamma)(tuR), and the combined bound results in the upper limit, B (t --> c gamma) < 0 : 21%, which is lower than the CDF result. For real kappa(gamma)(tuR), the upper bound on B (t --> c gamma) is about of the same order as the 5 sigma discovery potential of ATLAS with an integrated luminosity of 10 fb(-1). For B --> rho gamma decays, the NP contribution is enhanced by a large CKM factor vertical bar V(ud)/V(td)vertical bar, and the constraint on tu gamma coupling is rather restrictive, B (t --> u gamma) < 1 : 44 x 10(-5). With re fi ned measurements to be available at the LHCb and the future super-B factories, we can get close correlations between B --> V gamma and the rare t --> q gamma decays, which will be studied directly at the LHC ATLAS and CMS.
%K Beyond Standard Model
%K B-Physics
%R 10.1007/JHEP08(2011)075
%U http://arxiv.org/abs/1105.0364
%U https://doi.org/10.1007/JHEP08(2011)075
%P 075-22pp