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Recent charm physics results from CLEO
No full textIn this talk I present recent charm physics results from the CLEO experiment. Final state interactions and W-annihilation effects in charmed mesons decays are discussed. These include an isospin analysis of D {yields} K{anti K}, observation of the candidate W- annihilation decay D{sup +}{sub s} {yields} {omega}{pi}{sup +}, and evidence of non-factorizable effects in D{sup +}{sub s} {yields} {eta}{pi}{sup +}, {eta}`{pi}{sup +}, {eta}{rho}{sup +}, and {eta}`{rho}{sup +} decays. Presented next are CLEO`s observations of the spin 3/2 {sup +} excited charmed baryons {Sigma}{sup *++}{sub c} and {Sigma}{sup *0}{sub c}, and the excited charmed-strange baryons {Xi}{sup *+}{sub c} and {Xi}{sup *0}{sub c}. I conclude with future prospects in charm physics with CLEO`s new silicon detector
ΛΛ Production in Two-photon Interactions at CLEO
No full textUsing the CLEO detector at the Cornell e + e − storage ring, CESR, we study the two-photon production of ΛΛ, making the first observation of γγ → ΛΛ. We present the cross-section for γγ → ΛΛ as a function of the γγ center of mass energy and compare it to that predicted by the quark-diquark model
First determination of the CP content of D → ∏+∏−∏0 and D → K +K −∏0
No full textQuantum-correlated View the MathML source decays collected by the CLEO-c experiment are used to perform first measurements of F+, the fractional CP -even content of the self-conjugate decays D→∏+∏−∏0 and D→K+K−∏0. Values of 0.968±0.017±0.006 and 0.731±0.058±0.021 are obtained for ∏+∏−∏0 and K+K−∏0, respectively. It is demonstrated how modes of this sort can be cleanly included in measurements of the unitarity triangle angle γ using B∓→DK∓ decays. The high CP -even content of D→∏+∏−∏0, in particular, makes this a promising mode for improving the precision on γ
Limit on the Two-Photon Production of the Glueball Candidate fJ(2220) at CLEO
No full textWe use the CLEO detector at the Cornell e + e − storage ring, CESR, to search for the two-photon production of the glueball candidate fJ(2220) in its decay to KsKs. We present a restrictive upper limit on the product of the two-photon partial width and the KsKs branching fraction, (Γγγ BKsKs)fJ(2220). We use this limit to calculate a lower limit on the stickiness, which is a measure of the two-gluon coupling relative to the two-photon coupling. This limit on stickiness indicates that th
New determination of the D0→K -π +π0 and D0→K -π +π +π - coherence factors and average strong-phase d
No full textMeasurements of the coherence factors (RKππ0 and R K3π) and the average strong-phase differences (δDKππ0 and δDK3π) for the decays D0→K -π +π0 and D0→K -π +π +π - are presented. These parameters are important inputs to the determination of the unitarity triangle angle γ in B ∓→DK ∓ decays, where D designates a D0 or D-0 meson decaying to a common final state. The measurements are made using quantum correlated DD- decays collected by the CLEO-c experiment at the ψ(3770) resonance, and augment a previously published analysis by the inclusion of new events in which the signal decay is tagged by the mode D→KS0π+π- The measurements also benefit from improved knowledge of external inputs, namely the D0D-0 mixing parameters, rDKπ and several D-meson branching fractions. The measured values are RKππ0=0.82±0.07, δDKππ0=(164-14+20)°, RK3π=0.32-0.28+0.20 and δDK3π=(225-78+21)°. Consideration is given to how these measurements can be improved further by using the larger quantum-correlated data set collected by BESIII
CLEO Contributions to Tau Physics
No full textIntroduction Over the last dozen years, the CLEO Collaboration has made use of data collected by the the CLEO-II detector [1] to measure many of the properties of the tau lepton and its neutrino. Now that the experiment is making a transition from operation in the 10 GeV (B factory) region to the 3-5 GeV tau-charm factory region [2], it seemed to the author and the Tau02 conference organizers to be a good time to review the contributions of the CLEO experiment to tau physics. We are consciously omitting results from CLEO-I (data taken before 1989). The author has chosen to take a semi-critical approach, emphasizing both the strengths and weaknesses of tau physics at CLEO: past, present, and future. 2. Tau Production at 10 GeV We begin by discussing a topic on which CLEO has not published: tau pair production. In e e collisions, one can study taus in production and/or decay. The production reaction is governed by wellunderstood QED. As such, it is not terribly interesti
Cultural Placemaking Through the Arts - Cleo Leslie Smith
No full textCleo Leslie Smith is the owner of Cleo\u27s Silversmith Studio and Gallery in South Bethlehem. In this interview, Smith describes the importance of small businesses and galleries to a thriving community and artistic scene. Smith describes her own experience in becoming a craftsperson and in running her business, which was established by her father, who was from Allentown. Cleo\u27s has been in South Bethlehem since 1996. She talks about the importance of walkability and a diversity of stores to creating an interesting place. Smith discusses the hardships that artists and local businesses have been facing in recent times. In the time since this interview was conducted, Cleo\u27s has closed so that Smith can retire. This interview is part of a series of interviews conducted by Lehigh University in collaboration with area artists Doug Roysdon (Mock Turtle Marionette Theater), Anna Russell, and Avi Setton. These interviews were supported in part by the Lehigh University Mellon Digital Humanities Initiative. An oral history interview is an act of memory and hence both highly selective and highly subjective. While it accurately reflects what a narrator remembers (or chooses to tell) of his or her experience and viewpoints, it may not accurately represent what actually transpired or what another person may have experienced. As such users should subject interviews to the same degree of critical scrutiny they would any other historical source
Observation af the Omega(0)(c) charmed baryon at CLEO
No full textThe CLEO experiment at the CESR, collider has used 13.7 fb(-1) of data to search for the production of the Omega (0)(c) (css ground state) in e(+)e(-) collisions at roots similar or equal to 10.6 GeV. The modes used to study the Omega (0)(c) are Omega (-)pi (+), Omega (-)pi (+)pi (0), Xi (-)K(-)pi (+)pi (+), Xi (0)K(-)pi (+), and Omega (-)pi (+)pi (+)pi (-). We observe a signal of 40.4 +/- 9.0(stat) events at a mass of 2694.6 +/- 2.6(stat) 1.9(stat) MeV/c(2), for all modes combined
CLEO III operation
No full textOne year after the installation of most of the components of CLEO III, a strongly upgraded successor to the successful CLEO phase I and II experiments, and about half a year after its completion by the installation of the Silicon Detector, the experiment has successfully passed its commissioning phase and completed its first data-taking period. Major components of the detector upgrade are a new Drift Chamber with improved material distribution and a reduced volume to accommodate focussing accelerator components and the new particle identification system, a new four-layer Silicon Detector integrated in the overall tracking system to compensate for the reduced tracking volume and a proximity-focussing RICH with solid LiF crystal radiators and multi-wire proportional chambers filled with CH4/triethylamine. Preliminary performance benchmark studies have been completed and show that the CLEO III upgrade has been successful in achieving its design goals. (C) 2001 Published by Elsevier Science B.V
Measurement of the Pseudoscalar Decay Constant fDs Using Charm-Tagged Events
No full textWe present a new determination of fDs using 5 million e + e − → cc events obtained with the CLEO II detector. Our value is derived from our new measured ratio Γ(D + s → µ + ν)/Γ(D + s → φπ +) = 0.173 ± 0.021 ± 0.031. Using B(D + s → φπ+) = (3.6 ± 0.9)%, we extract fDs = (280 ± 17 ± 25 ± 34) MeV. We compare this result with various model calculations
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