Using 20.7 pb −1 of e + e − annihilation data taken at √ s = 3.671 GeV with the CLEO-c detector, precision measurements of the electromagnetic form factors of the charged pion, charged kaon, and proton have been made for timelike momentum transfer of |Q 2 | = 13.48 GeV 2 by the reaction e + e − → h + h − . The measurements are the first ever with identified pions and kaons of |Q 2 | > 4 GeV 2 , with the results F π (13.48 GeV 2 ) = 0.075 ± 0.008(stat) ± 0.005(syst) and F K (13.48 GeV 2 ) = 0.063±0.004(stat)±0.001(syst). The result for the proton, assumingGeV 2 ) = 0.014 ± 0.002(stat) ± 0.001(syst), which is in agreement with earlier results.

Using 13.5 fb Ϫ1 of e ϩ e Ϫ annihilation data collected with the CLEO II detector, we have observed a narrow resonance decaying to D s * ϩ 0 with a mass near 2.46 GeV/c 2. The search for such a state was motivated by the recent discovery by the BaBar Collaboration of a narrow state at 2.32 GeV/c 2 , the D sJ * (2317) ϩ , that decays to D s ϩ 0. Reconstructing the D s ϩ 0 and D s * ϩ 0 final states in CLEO data, we observe peaks in both of the corresponding reconstructed mass difference distributions, ⌬M (D s 0)ϭM (D s 0)ϪM (D s) and ⌬M (D s * 0)ϭM (D s * 0)ϪM (D s *), both of them at values near 350 MeV/c 2. We interpret these peaks as signatures of two distinct states, the D sJ * (2317) ϩ plus a new state, designated as the D sJ (2463) ϩ. Because of the similar ⌬M values, each of these states represents a source of background for the other if photons are lost, ignored or added. A quantitative accounting of these reflections confirms that both states exist. We have measured the mean mass differences ͗⌬M (D s 0)͘ϭ350.0Ϯ1.2 (stat)Ϯ1.0 (syst) MeV/c 2 for the D sJ * (2317) ϩ state, and ͗⌬M (D s * 0)͘ϭ351.2Ϯ1.7 (stat)Ϯ1.0 (syst) MeV/c 2 for the new D sJ (2463) ϩ state. We have also searched, but find no evidence, for decays of the two states via the channels D s * ϩ ␥, D s ϩ ␥, and D s ϩ ϩ Ϫ. The observations of the two states at 2.32 and 2.46 GeV/c 2 , in the D s ϩ 0 and D s * ϩ 0 decay channels, respectively, are consistent with their interpretations as cs mesons with an orbital angular momentum Lϭ1 and spin and parity J P ϭ0 ϩ and 1 ϩ .

Using data collected with the CLEO detector operating at the CESR e+e- collider at sqrt[s]=3.97-4.26 GeV, we investigate 15 charmonium decay modes of the psi(4040), psi(4160), and Y(4260) resonances. We confirm, at 11 sigma significance, the BABAR Y(4260)-->pi+pi- J/psi discovery, make the first observation of Y(4260)--> pi(0)pi(0) J/psi (5.1 sigma), and find the first evidence for Y(4260)-->K+K- J/psi(3.7 sigma). We measure e+e- cross sections at sqrt[s]=4.26 GeV as sigma(pi+pi- J/psi)=58(+12)(-10)+/-4 pb, sigma(pi(0)pi(0) J/psi)=23(+12)(-8)+/-1 pb, and sigma(K+K- J/psi)=9(+9)(-5)+/-1 pb, in which the uncertainties are statistical and systematic, respectively. Upper limits are placed on other decay rates from all three resonances.

We have studied semileptonic B decay to the exclusive charmless states π, ρ/ω, η and η using the full 15.5 fb −1 CLEO Υ(4S) sample, with measurements performed in subregions of phase space to minimize dependence on a priori knowledge of the form factors involved. We find total branching fractions B(B 0 → π − + ν) = (1.37 ± 0.15 stat ± 0.11 sys ) × 10 −4 and B(B 0 → ρ − + ν) = (2.93 ± 0.37 stat ± 0.37 sys ) × 10 −4 . We find evidence for B + → η + ν, with B(B + → η + ν) = (2.66 ± ±0.80 stat ± 0.56 sys ) × 10 −4 and 1.20 × 10 −4 < B(B + → η + ν) < 4.46 × 10 −4 (90% CL). We also limit B(B + → η + ν) < 1.01 × 10 −4 (90% CL). By combining our B → π ν information with unquenched lattice calculations, we find |V ub | = (3.6 ± 0.4 stat ± 0.2 sys +0.6 −0.4thy ) × 10 −3 .2

The decay branching fractions of the three narrow Upsilon resonances to mu(+)mu(-) have been measured by analyzing about 4.3 fb(-1) e(+)e(-) data collected with the CLEO III detector. The branching fraction B(Upsilon(1S)-->mu(+)mu(-))=(2.49+/-0.02+/-0.07)% is consistent with the current world average, but B(Upsilon(2S)-->mu(+)mu(-))=(2.03+/-0.03+/-0.08)% and B(Upsilon(3S)-->mu(+)mu(-))=(2.39+/-0.07+/-0.10)% are significantly larger than prior results. These new muonic branching fractions imply a narrower total decay width for the Upsilon(2S) and Upsilon(3S) resonances and lower other branching fractions that rely on these decays in their determination.