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More precise determination of V_cb & V_ub and direct CP violation in charmless B decays
Yue-liang Wu,Yu-Feng Zhou,YWhen-Yu Wang 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.2
More precise extractions on the two important CKM matrix elements jVcbj and jVubj are presented up to 1=m2 Q corrections, based on the complete heavy-quark eective eld theory (HQEFT) of QCD. The HQEFT as a large component QCD provides us with a complete theoretical framework for correctly and systematically evaluating the subleading and higher-order contributions in 1=mQ expansion of heavy quarks. A global analysis on charmless B decays is made, based on the isospin and SU(3) avor symmetry. An isospin relation is found to be very useful for studying SU(3) symmetry-breaking eects of strong phases and exploring new types of electroweak penguin eects. The direct CP violation in charmless B decays is predicted, and its precise measurement is helpful either for testing SU(3) symmetry breaking eects of strong phases or for probing new physics beyond standard model.