arXiv subjects

Yong-Yeon Keum

Publications and source records attributed to Yong-Yeon Keum.

21 records · Page 2Linked to original sources

arXiv2001

Fat penguins and imaginary penguins in perturbative QCD

We evaluate $B\to Kπ$ decay amplitudes in perturbative QCD picture. It is found that penguin contributions are dynamically enhanced by nearly 50% compared to those assumed in the factorization approximation. It is also shown that annihilation diagrams are not negligible, and give large strong phases. Our results for branching ratios of $B\to Kπ$ decays for a representative parameter set are consistent with data. We evaluate $B\to Kπ$ decay amplitudes in perturbative QCD picture. It is found that penguin contributions are dynamically enhanced by nearly 50% compared to those assumed in the factorization approximation. It is also shown that annihilation diagrams are not negligible, and give large strong phases. Our results for branching ratios of $B\to Kπ$ decays for a representative parameter set are consistent with data.

hep-ph↗

arXiv2000

Nonleptonic charmless B decays: factorization vs perturbative QCD

We compare the factorization approach, the perturbative QCD approach and the Beneke-Buchalla-Neubert-Sachrajda approach to nonleptonic charmless $B$ meson decays. We discuss their treatments of factorizable, nonfactorizable, and annihilation contributions, infrared-cutoff and scale dependences, and strong phases. It is proposed that measurement of CP asymmetries in two-body $B$ meson decays provides an appropriate test of the these approaches.

hep-ph↗

arXiv1997

Probing penguin coefficients with the lifetime ratio tau(B_s)/tau(B_d)

We calculate penguin contributions to the lifetime splitting between the B_s and the B_d meson. In the Standard Model the penguin effects are found to be opposite in sign, but of similar magnitude as the contributions of the current-current operators, despite of the smallness of the penguin coefficients. We predict tau(B_s)/tau(B_d) -1 = ( -1.2 +/- 10.0 ) * 10^(-3) * (f_{B_s}/190 MeV)^2 where the error stems from hadronic uncertainties. Since penguin coefficients are sensitive to new physics and poorly tested experimentally, we analyze the possibility to extract them from a future precision measurement of tau(B_s)/tau(B_d). Anticipating progress in the determination of the hadronic parameters epsilon_1, epsilon_2 and f_{B_s}/f_{B_d} we find that the coefficient C_4 can be extracted with an uncertainty of order |Delta C_4|= 0.1 from the double ratio (tau(B_s)-tau(B_d))/(tau(B^+)-tau(B_d)), if |epsilon_1-epsilon_2| is not too small.

hep-ph↗