As part of the "CESR-c" upgrade project, a full-scale prototype superferric wiggler module has been installed into the Cornell Electron Storage Ring (CESR) and successfully operated since October 2002. At least eleven more wigglers are to be installed to enable full operation of the CESR-c. The wiggler magnets are chosen to achieve the necessary damping for optimum operation of CESR-c at a beam energy of 1.88 GeV. The wiggler cryostat units are designed to be modular, of fixed length flange-to-flange, so that they can be easily installed and exchanged. The cryostat incorporates several novel features including a suspension system with very low heat leak that prevents any significant motion during cool down, a custom triple cryogenic feedthrough, and a helium vessel made in two halves, each enclosing a half-magnet. This article presents the design, fabrication, and operation of the CESR-c wiggler cryostat.

Using data recorded by the CLEO detector at CESR, we report preliminary evidence for previously of unknown charmed baryons. In the charm-strange sector, we find two states, one decaying into Xi (0)(c)'pi (+) with the subsequent decay Xi (0)(c)' --> Xi (0)(c)gamma, and its isospin partner decaying into Xi (+')(c)pi (-) followed by Xi (+')(c) --> Xi (+)(c)gamma. We measure the following mass differences for th two states: M(Xi (0)(c)gamma pi (+)) - M(Xi (0)(c)) = 319.3 +/- 1.7 +/- 2.5 MeV, and M(Xi (+)(c)gamma pi (-)) - M(Xi (+)(c)) = 323.0 +/- 1.9 +/- 2.5 MeV. We interpret these states are the J(P) = 1/2(-) Xi (c1) particles, the charmed-strange analogs of the Lambda (+)(c1)(2593). We have also investigated the spectrum of charmed baryons more massive than the Lambda (c1), which may decay into Lambda (+)(c)pi (-)pi (+), finding evidence for two new states. One is wide and has an invariant mass about 489 MeV above the Lambda (+)(c); the other is comparatively narrow and has an invariant mass of 596 +/- 1 +/-1 MeV above the Lambda (+)(c).

I report results of a search for several rare few-body decays of the B-meson. For the decays B0→π+π-, B0→K+π-, and B0→K+K-, we limit the branching fractions (at 90% confidence) toBππ<2.9·10−5,BKπ<2.6·10−5, andBKK<0.7·10−5. While there is no statistically significant signal in any single mode, the sum ofBππ andBKπ exceeds zero with a significance of more than four standard deviations, indicating that we have observed charmless hadronic B-decays. We have also detected the decays Bo→K* (892)o γ and B−→K* (892)− γ, evidence for the quark-level process b→sγ. The average branching fraction is (4.5±1.5±0.9)·10−5, consistent with standard model predictions from electromagnetic penguin diagrams.

Using almost 5fb −1 of e+e− data accumulated at the CESR collider in the energy region around 10.5 GeV, the CLEO II collaboration has found evidence for several narrow excitations of the Ξc. Two of these are seen in the modes Ξ c + γ and Ξ c 0 γ are identified with Ξ c 1 , the J p = 1/2 + c{sq} state, which is symmetric under exchange of light quark quantum numbers. The third state is seen in its decay to Ξ c + π+π− via an intermediate Ξ c * and is consistent with the Ξ c1 + , a J p = 3/2− p- wave state analogous to the ⋀ c1 + (2625). The mass differences relative to the ground state are: M(Ξ c + ′) − M(Ξc) = 107.8 ± 1.7 ± 2.5MeV/c2, M(Ξ c 0 ′) − M(Ξc) = 107.0 ± 1.5 ± 2.5MeV/c2, and M(Ξ c + ) − M(Ξ c + ) = 349.4 ± 0.7 ± 1.0MeV/c2

With a data sample of 2.6 million pairs and 4.8 million pairs produced at the CESR e(+)e(-) storage ring, the CLEOII collaboration has new results on several poorly known decay processes. We have measured the branching ratio and the form factor f(+)(q(2)) in the (B-0) over bar --> D(+)l(-)<(nu)over bar>. The differential decay rate, analyzed in terms of the variable w = v . v', agrees with the HQET prediction for the form factor at w = 1, F(1), and its slope rho(2). Further, we have determined the branching ratios for semileptonic B- decay to the p-wave charmed mesons, D-2(*0) and D-1(0), and made the first statistically significant measurement of the branching ratio for D*+ --> D(+)gamma.

CLEO's large sample of ♥(4S) decays has yielded measurements of the various exclusive semileptonic decays: (B̄0, B−) → (D+, D∗+)ℓ\̄gnℓ and (D0, D∗0)ℓ\̄gnℓ. These imply the ratio of the charged and neutral lifetimes to be τ−/τ0 = 0.89 ± 0.23. The (model dependent) vector/pseudoscalar decay-width ratio is found to be 2.6 ± 1.1. In contrast to this important but not unexpected result is the observation of ♥(4S) decays to non-BB̄ states, as evidenced by φ's beyond the kinematic limit for BB̄ decay. No compelling explanation is known for the branching ratio of greater than 0.2 percent.