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We present the recent measurements of the B0 -> eta K0 and the B -> omega K decay modes based on the full data set of 772x10^6 BBbar pairs collected by the Belle detector at the KEKB e+e- collider. In the B0 -> eta K^{0} mode, we obtain the CP-violating parameters A(etaK0) = +0.03+/-0.05(stat)+/-0.04(syst), S(etaK0) = +0.68+/-0.07(stat)+/-0.03(syst). This is the worlds most precise result on the eta K0 CP parameters. In B -> omega K decays, we measure the branching fractions B(B0 -> omega K0) = (4.5+/-0.4(stat)+/-0.3(syst))x10^-6, B(B- -> omega K-) = (6.8+/-0.4(stat)+/-0.4(syst))x10^-6, which are their current most precise results. We measure the first evidence of CP violation in the B0 -> omega K0S decay mode, obtaining the CP-violating parameters A(omega K0S} = -0.36+/-0.19(stat)+/-0.05(syst), S(omega K0S} = +0.91+/-0.32(stat)+/-0.05(syst). In the B- -> omega K- mode, we measure the direct CP-violation parameter A(omega K-) = -0.03+/-0.04(stat)+/-0.01(syst), which is its most precise measurement to date.
We report on preliminary measurements of branching fractions, charge-parity-violating asymmetries, and longitudinal polarization fractions in charmless bottom-meson decays from the Belle~II experiment. We use samples of electron-positron collisions c
The search for multi-quark states beyond the constituent quark model (CQM) has resulted in the discovery of many new exotic states, starting with the observation of the X(3872), discovered by Belle in 2003. Also in the sector of charm-strange physics
We present the first measurements of absolute branching fractions of $Xi_c^0$ decays into $Xi^- pi^+$, $Lambda K^- pi^+$, and $p K^- K^- pi^+$ final states. The measurements are made using a data set comprising $(772pm 11)times 10^{6}$ $Bbar{B}$ pair
We present the first measurements of the absolute branching fractions of $Xi_c^+$ decays into $Xi^- pi^+ pi^+$ and $p K^- pi^+$ final states. Our analysis is based on a data set of $(772pm 11)times 10^{6}$ $Bbar{B}$ pairs collected at the $Upsilon(4S
Quarkonium is the bound state of a heavy quark and its anti-quark counterpart. The study of this system has experienced a renaissance thanks to results from e+e- collider experiments, including discoveries of long-predicted conventional quarkonia, an