Exploring CP violation with $B_s^0\to \overline{D^0}\varphi$ decays

Abstract

We note that it is possible to determine the weak phase \gamma from the time dependent measurements of the decays $B_s^0(t)({\bar{B}}_s^0(t))\to {\bar{D}}^0\varphi withoutanyhadronicuncertainties.Thesedecaysaredescribedbythecolorsuppressedtreediagramsandhencearefreefromthepenguinpollutions.Wefurtherdemonstratethat\gamma canalsobeextractedwithnohadronicuncertaintiesfromanangularanalysisofcorrespondingvectorvectormodes,$B_s^0(t) (\bar B_s^0 (t)) \to \bar D^{* 0} \phi $.Althoughthebranchingratiosforthesedecaymodesarequitesmall$ {\cal O} (10^{-5}-10^{-6})$, the strategies presented here appear to be particularly interesting for the "second generation" experiments at hadronic B factories.

Comments: 13 pages, LaTeX, 2 references added, Minor changes in the text, to appear in Phys. Rev. D