DirectCPviolation inΛbdecays

Antitriplet charmed baryon decays with SU(3) flavor symmetry

“…Since BESIII and LHCb are expected to search for all possible antitriplet charmed baryon decays, one can test whether or not the studies of Λ þ c → B n M can be applied to Ξ 0;þ c → B n M. Theoretically, the factorization for the b baryon decays [8][9][10][11][12][13] does not work for the charmed baryon decays, which receive corrections by taking into account the nonfactorizable effects [14][15][16][17][18][19]. On the other hand, the possible b or c hadron decay modes can be examined by the SUð3Þ f symmetry [20][21][22][23][24][25][26][27][28][29][30][31].…”

Study of $$\Lambda _b\rightarrow \Lambda (\phi ,\eta ^{(\prime )})$$ Λ b → Λ ( ϕ , η ( ′ ) ) and $$\Lambda _b\rightarrow \Lambda K^+K^-$$ Λ b → Λ K + K - decays

“…(5), we have neglected the form factors related toū σ μν q ν (γ 5 )u b andū q μ (γ 5 )u b that flip the helicity [24]. With the double-pole momentum dependences, f 1 and g 1 can be written as [8,9] …”

“…Moreover, the first work on b → η with the branching ratios predicted to be O(10 −6 − 10 −5 ) in comparison with the data in Eq. (1) was done before the observations of b → p(K − , π − ), which can be used to extract the b → B n transition form factors from QCD models [8,9,20]. For a reconciliation, we would like to reanalyze b → η ( ) .…”

“…In this work, we will use the factorization approach for the theoretical calculations of b → φ and b → η ( ) as those in the b → p(K * − , π − , ρ − ) decays [8,9].…”

“…Theoretically, b → p(K * − , π − , ρ − ) decays via b → uū (d, s) at the quark level have been studied in the literature [4][5][6][7][8][9][10]. In particular, it is interesting to point out that the direct CP violating asymmetry in b → pK * − is predicted to be as large as 20 %, which is promising as regards a e-mail: geng@phys.nthu.edu.tw observation in the future measurements.…”