We report the observation of two narrow structures in the mass spectra of the π^{±}Υ(nS)(n=1, 2, 3) and π^{±}h_{b}(mP)(m=1, 2) pairs that are produced in association with a single charged pion in Υ(5S) decays. The measured masses and widths of the two structures averaged over the five final states are M_{1}=(10 607.2±2.0)  MeV/c^{2}, Γ_{1}=(18.4±2.4)  MeV, and M_{2}=(10 652.2±1.5)  MeV/c^{2}, Γ_{2}=(11.5±2.2)  MeV. The results are obtained with a 121.4  fb^{-1} data sample collected with the Belle detector in the vicinity of the Υ(5S) resonance at the KEKB asymmetric-energy e^{+}e^{-} collider.

We search for CP violation in Cabibbo-suppressed charged D meson decays by measuring the difference between the CP-violating asymmetries for the Cabibbo-suppressed decays D^{±}→K^{+}K^{-}π^{±} and the Cabibbo-favored decays D_{s}^{±}→K^{+}K^{-}π^{±} in the K^{+}K^{-} mass region of the ϕ resonance. Using 955  fb^{-1} of data collected with the Belle detector, we obtain A_{CP}^{D^{+}→ϕπ^{+}}=(+0.51±0.28±0.05)%. The measurement improves the sensitivity of previous searches by more than a factor of 5. We find no evidence for direct CP violation.

We report the first observations of the spin-singlet bottomonium states h_{b}(1P) and h_{b}(2P). The states are produced in the reaction e^{+}e^{-}→h_{b}(nP)π^{+}π^{-} using a 121.4  fb^{-1} data sample collected at energies near the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. We determine M[h_{b}(1P)]=(9898.2_{-1.0-1.1}^{+1.1+1.0})  MeV/c^{2} and M[h_{b}(2P)]=(10 259.8±0.6_{-1.0}^{+1.4})  MeV/c^{2}, which correspond to P-wave hyperfine splittings ΔM_{HF}=(+1.7±1.5) and (+0.5_{-1.2}^{+1.6})  MeV/c^{2}, respectively. The significances of the h_{b}(1P) and h_{b}(2P) are 5.5σ and 11.2σ, respectively. We find that the production of the h_{b}(1P) and h_{b}(2P) is not suppressed relative to the production of the Υ(1S), Υ(2S), and Υ(3S).

We report measurements of the branching fractions and CP asymmetries for B^{±}→ηh^{±}(h=K or π) and the observation of the decay B^{0}→ηK^{0} from the final data sample of 772×10^{6}  BB[over ¯] pairs collected with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. The measured branching fractions are B(B^{±}→ηK^{±})=(2.12±0.23±0.11)×10^{-6}, B(B^{±}→ηπ^{±})=(4.07±0.26±0.21)×10^{-6}, and B(B^{0}→ηK^{0})=(1.27_{-0.29}^{+0.33}±0.08)×10^{-6}, where the last decay is observed for the first time with a significance of 5.4 standard deviations (σ). We also find evidence for CP violation in the charged B modes, A_{CP}(B^{±}→ηK^{±})=-0.38±0.11±0.01 and A_{CP}(B^{±}→ηπ^{±})=-0.19±0.06±0.01 with significances of 3.8  σ and 3.0  σ, respectively. For all measurements, the first and second uncertainties are statistical and systematic, respectively.

Flow coefficients v_{n} for n=2, 3, 4, characterizing the anisotropic collective flow in Au+Au collisions at sqrt[s_{NN}]=200  GeV, are measured relative to event planes Ψ_{n}, determined at large rapidity. We report v_{n} as a function of transverse momentum and collision centrality, and study the correlations among the event planes of different order n. The v_{n} are well described by hydrodynamic models which employ a Glauber Monte Carlo initial state geometry with fluctuations, providing additional constraining power on the interplay between initial conditions and the effects of viscosity as the system evolves. This new constraint can serve to improve the precision of the extracted shear viscosity to entropy density ratio η/s.

We report the first observation of the doubly Cabibbo-suppressed decays D^{+}→K^{+}η^{(')} using a 791  fb^{-1} data sample collected with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. The ratio of the branching fractions of doubly Cabibbo-suppressed relative to singly Cabibbo-suppressed D^{+}→π^{+}η^{(')} decays are B(D^{+}→K^{+}η)/B(D^{+}→π^{+}η)=(3.06±0.43±0.14)% and B(D^{+}→K^{+}η^{'})/B(D^{+}→π^{+}η^{'})=(3.77±0.39±0.10)%. From these, we find that the relative final-state phase difference between the tree and annihilation amplitudes in D^{+} decays, δ_{TA}, is (72±9)° or (288±9)°. We also report the most precise measurements of CP asymmetries to date: A_{CP}^{D^{+}→π^{+}η}=(+1.74±1.13±0.19)% and A_{CP}^{D^{+}→π^{+}η^{'}}=(-0.12±1.12±0.17)%.

Back-to-back hadron pair yields in d+Au and p+p collisions at √s(NN)=200 GeV were measured with the PHENIX detector at the Relativistic Heavy Ion Collider. Rapidity separated hadron pairs were detected with the trigger hadron at pseudorapidity |η|<0.35 and the associated hadron at forward rapidity (deuteron direction, 3.0<η<3.8). Pairs were also detected with both hadrons measured at forward rapidity; in this case, the yield of back-to-back hadron pairs in d+Au collisions with small impact parameters is observed to be suppressed by a factor of 10 relative to p+p collisions. The kinematics of these pairs is expected to probe partons in the Au nucleus with a low fraction x of the nucleon momenta, where the gluon densities rise sharply. The observed suppression as a function of nuclear thickness, p(T), and η points to cold nuclear matter effects arising at high parton densities.

We present measurements of J/ψ yields in d+Au collisions at sqrt[s(NN)]=200  GeV recorded by the PHENIX experiment and compare them with yields in p+p collisions at the same energy per nucleon-nucleon collision. The measurements cover a large kinematic range in J/ψ rapidity (-2.2<y<2.4) with high statistical precision and are compared with two theoretical models: one with nuclear shadowing combined with final state breakup and one with coherent gluon saturation effects. In order to remove model dependent systematic uncertainties we also compare the data to a simple geometric model. The forward rapidity data are inconsistent with nuclear modifications that are linear or exponential in the density weighted longitudinal thickness, such as those from the final state breakup of the bound state.

We report a study of B→(J/ψγ)K and B→(ψ^{'}γ)K decay modes using 772×10^{6} BB[over ¯] events collected at the Υ(4S) resonance with the Belle detector at the KEKB energy-asymmetric e^{+}e^{-} collider. We observe X(3872)→J/ψγ and report the first evidence for χ_{c2}→J/ψγ in B→(X_{cc[over ¯]}γ)K decays, while in a search for X(3872)→ψ^{'}γ no significant signal is found. We measure the branching fractions, B(B^{±}→X(3872)K^{±})B(X(3872)→J/ψγ)=(1.78_{-0.44}^{+0.48}±0.12)×10^{-6}, B(B^{±}→χ_{c2}K^{±})=(1.11_{-0.34}^{+0.36}±0.09)×10^{-5}, B(B^{±}→X(3872)K^{±})B(X(3872)→ψ^{'}γ)<3.45×10^{-6}(upper limit at 90% C.L.), and also provide upper limits for other searches.

The interference fragmentation function translates the fragmentation of a quark with a transverse projection of the spin into an azimuthal asymmetry of two final-state hadrons. In e^{+}e^{-} annihilation the product of two interference fragmentation functions is measured. We report nonzero asymmetries for pairs of charge-ordered π^{+}π^{-} pairs, which indicate a significant interference fragmentation function in this channel. The results are obtained from a 672  fb^{-1} data sample that contains 711×10^{6} π^{+}π^{-} pairs and was collected at and near the Υ(4S) resonance, with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider.