Looking from the East at an Elephant Trotting West: Direct CP Violation in $B^0$ Decays

Details Looking from the East at an Elephant Trotting West: Direct CP Violation in $B^0$ Decays Looking from the East at an Elephant Trotting West: Direct CP Violation in $B^0$ Decays

2002-03-17

arxiv.org/abs/hep-ph/0203157v2

Phys.Lett. B535 (2002) 155-158

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, LATEX, no figures; references added and corrected; BABAR data on $B_d(t) \to \pi^+\pi^-$ included; text slightly exte

Scientific paper

10.1016/S0370-2693(02)01756-2

With the time dependant CP asymmetry in $B_d(t) \to \psi K_S$ well measured, the most powerful method to search for {\em direct} CP violation in $B_d$ decays is to analyze whether the CP asymmetry of other transitions like $B_d(t) \to \pi ^+ \pi ^-, \eta ^{\prime}K_S$ etc. can be described by a $sin$ term taken from $B_d(t) \to \psi K_S$ and without a cos term. The failure of such a constrained fit would establish direct CP violation (even if no CP asymmetry were observed in these other modes).

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