D. M. Coffman
Cornell University
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Featured researches published by D. M. Coffman.
Physical Review Letters | 1989
Joan Adler; D.H. Coward; D. E. Dorfan; W. Stockhausen; W. J. Wisniewski; G. Eigen; D. Pitman; R. E. Cassell; D. Wisinski; K. O. Bunnell; A. I. Mincer; Robert F. Mozley; J. D. Richman; K. Einsweiler; A. Li; C. A. Heusch; A. J. Weinstein; I. E. Stockdale; H. J. Willutzki; A. Odian; R. P. Hamilton; B. Tripsas; R. H. Schindler; U. Mallik; T. Browder; C. Simopoulos; C. Gatto; S. A. Plaetzer; J. Drinkard; D. M. Coffman
Measurements of the exclusive branching fractions B(D^0→π^-e^+ν_e) and B(D^0→K^-e^+ν_e), using data collected at the ψ(3770) with the Mark III detector at the SLAC e^+e^- storage ring SPEAR, are used to determine the ratio of the Kobayashi-Maskawa matrix elements │V_(cd)/V_(cs)│^2 =0.057_(-0.015)^(+0.038)±0.005.
Physics Letters B | 1987
Joan Adler; J. J. Becker; G. Blaylock; T. A. Bolton; J. S. Brown; K. O. Bunnell; T. H. Burnett; R. E. Cassell; D. M. Coffman; V. Cook; D.H. Coward; D. E. Dorfan; G. P. Dubois; A. L. Duncan; G. Eigen; K. Einsweiler; B. I. Eisenstein; T. Freese; G. E. Gladding; C. Grab; F. Grancagnolo; R. P. Hamilton; J. Hauser; C. A. Heusch; D. G. Hitlin; J. M. Izen; L. Köpke; A. Li; W. S. Lockman; U. Mallik
Abstract Dalitz plot analyses of four Kππ decays of the D 0 and D + mesons are presented. The relative amounts of K ∗ π, Kϱ and non-resonant Kππ in each decay mode are determined, and isospin amplitudes and phases are derived. These results are compared with predictions from QCD. The K − π + π + mode has a non-uniform, non-resonant contribution; attempts to fit this distribution are described.
Physics Letters B | 1989
P. Avery; D. Besson; L. Garren; J. Yelton; T. Bowcock; K. Kinoshita; F. M. Pipkin; M. Procario; Richard Wilson; J. Wolinski; D. Xiao; P. Baringer; P. Haas; Ha Lam; A. Jawahery; C. H. Park; D. Perticone; R. Poling; R. Fulton; M. Hempstead; T. Jensen; D. R. Johnson; H. Kagan; R. Kass; F. Morrow; J. Whitmore; W.-Y. Chen; J. Dominick; R. L. McIlwain; David Harry Miller
Abstract We have measured upper limits on branching fractions for rare exclusive decays of B mesons arising from one-loop diagrams in the standard model of electroweak interactions. We also obtain an upper limit for the lepton-number-violating decay B 0 → μ ± e ∓ .
Physics Letters B | 1989
M. S. Alam; N. Katayama; I. J. Kim; W. C. Li; X. C. Lou; C. R. Sun; D. Bortoletto; M. Goldberg; N. Horwitz; M. D. Mestayer; G. C. Moneti; V. Sharma; I. P. J. Shipsey; T. Skwarnicki; S. E. Csorna; T. Letson; I. Brock; T. Ferguson; J. P. Alexander; M. Artuso; C. Bebek; K. Berkelman; D. G. Cassel; E. Cheu; D. M. Coffman; G. Crawford; J. W. DeWire; P. S. Drell; R. Ehrlich; R. S. Galik
Abstract Using the CLEO detector, we present a measurement of the mass of the charged charmed strange baryon Ξ + c and its neutral counterpart the Ξ 0 c . The Ξ + c is observed through its decay to Ξ - π + π + , and its mass is measured to be (2467±3±4) MeV. The isospin mass splitting of the Ξ c system is found to be M ( Ξ + c )- M ( Ξ 0 c )=(−5±4±1)MeV.
Physics Letters B | 1988
Joan Adler; J. J. Becker; G. Blaylock; T. A. Bolton; J. C. Brient; J. S. Brown; K. O. Bunnell; Mark J. Burchell; T. H. Burnett; R. E. Cassell; D. M. Coffman; V. Cook; D.H. Coward; D. E. Dorfan; J. Drinkard; G. P. Dubois; A. L. Duncan; G. Eigen; K. Einsweiler; B. I. Eisenstein; T. Freese; C. Gatto; G. E. Gladding; C. Grab; R. P. Hamilton; J. Hauser; C. A. Heusch; D. G. Hitlin; J. M. Izen; P. C. Kim
We report a new measurement of the D∗ branching ratios, using data obtained with the Mark III detector at the e^+e^− storage ring SPEAR at s=4.14GeV. A fit to the recoil mass squared spectrum of D mesons reconstructed through the decay modes K^−π^+π^+ and K^−π^+ is used to extract the D^(∗+) → γD^+, π^0D^+, π^+D^0 and D^(∗0) → γD^0, π^0D^0 branching ratios.
Physical Review Letters | 1990
Z. Bai; G. Blaylock; T. A. Bolton; T. E. Browder; J. S. Brown; K. O. Bunnell; T. H. Burnett; R. E. Cassell; D. M. Coffman; Cook; F. DeJongh; D. E. Dorfan; J. Drinkard; G. P. Dubois; G. Eigen; K. Einsweiler; B. I. Eisenstein; T. Freese; C. Gatto; G. E. Gladding; J. Hauser; C. A. Heusch; D. G. Hitlin; J. M. Izen; P. Kim; J. Labs; A. Li; W. S. Lockman; U. Mallik; C. G. Matthews
We present a study of the radiative decay J/ψ→γOO in the γK + K − K + K − and γK + K − K S 0 K L 0 final states. A pseudoscalar state is observed in the OO invariant-mass spectrum at 2.22 GeV/c 2 with a width of 150 MeV/c 2 . The product branching ratios are B(J/ψ→γX)B(X→OO)=(3.3±0.8±0.5)×10 −4 for the MeV/c γK + K − K + K − mode and B(J/ψ→γX)B(X→OO)=(2.7±0.6±0.6)×10 −4 for the γK + K − K S 0 K L 0 mode. No evidence for 2 ++ states below 2.4 GeV/c 2 is found in this decay
Physical Review Letters | 1990
J. P. Alexander; M. Artuso; C. Bebek; K. Berkelman; T. E. Browder; D. G. Cassel; E. Cheu; D. M. Coffman; G. Crawford; J. W. DeWire; P. S. Drell; R. Ehrlich; R. S. Galik; B. Gittelman; S. W. Gray; A. M. Halling; D. L. Hartill; B. K. Heltsley; J. Kandaswamy; N. Katayama; D. L. Kreinick; J. D. Lewis; G. S. Ludwig; N. B. Mistry; J. Mueller; S. Nandi; E. Nordberg; C. Oegrady; D. Peterson; M. Pisharody
Using the CLEO detector at the Cornell Electron Storage Ring (CESR), we have determined the ratio {Gamma}({ital D}{sub {ital s}}{sup +}{r arrow}{phi}{ital l}{sup +}{nu})/{Gamma}({ital D}{sub {ital s}}{sup +} {r arrow}{phi}{pi}{sup +})=0.49{plus minus}0.10{sub {minus}0.14}{sup +0.10}. We use this measurement to derive {ital B}({ital D}{sub {ital s}}{sup +}{r arrow}{phi}{pi}{sup +}).
Physical Review Letters | 1995
R. Balest; K. Cho; W. T. Ford; M. Lohner; H. Park; P. Rankin; J. G. Smith; J. P. Alexander; C. Bebek; B. E. Berger; K. Berkelman; K. Bloom; T. E. Browder; D. G. Cassel; H. A. Cho; D. M. Coffman; D. S. Crowcroft; M. Dickson; P. S. Drell; D. J. P. Dumas; R. Ehrlich; R. Elia; P. Gaidarev; M. Garcia-Sciveres; B. Gittelman; S. W. Gray; D. L. Hartill; B. K. Heltsley; S. Henderson; C. D. Jones
We use a data sample of 2.8 × 10 6 produced τ-pair events, obtained with the CLEO II detector, to measure B(τ - Ⅵh - h + h - (π 0 )ν τ ), where h refers to either a charged π or K. These branching fractions are measured with samples of lepton-tagged and 3 vs 3 events. We find B(τ - Ⅵh - h + h - ν τ )=0.0951±0.0007±0.0020 and B(τ - Ⅵh - h + h - π 0 ν τ )=0.0423±0.0006±0.0022. We also measure B(τ - Ⅵωh - ν τ )=0.0195±0.0007±0.0011.
Physics Letters B | 1990
W.-Y. Chen; R. L. McIlwain; D. H. Miller; C. R. Ng; S. F. Schaffner; E. I. Shibata; W. M. Yao; K. Sparks; E. H. Thorndike; C. H. Wang; M. S. Alam; I. J. Kim; W. C. Li; X. C. Lou; C. R. Sun; P. N. Wang; M. I. Zoeller; D. Bortoletto; M. Goldberg; N. Horwitz; V. Jain; M. D. Mestayer; G. C. Moneti; V. Sharma; I. P. J. Shipsey; T. Skwarnicki; M. Thulasidas; S. E. Csorna; T. Letson; J. P. Alexander
Abstract Using the CLEO detector at the Cornell Electron Storage Ring, we have searched for two-photon production of charmonium in four-track final states. We have measured Γ γγ ( η c )=5.9 +2.1 −1.8 ±1.9 keV, and we have obtained 95% CL upper limits of Γ γγ ( X c 0 ) Γ γγ ( X c 2 )
Physical Review Letters | 1997
C. P. Jessop; K. Lingel; H. Marsiske; M. Perl; S. F. Schaffner; D. Ugolini; R. Wang; X. Zhou; T. E. Coan; V. Fadeyev; I. Korolkov; Y. Maravin; I. Narsky; V. G. Shelkov; J. Staeck; R. Stroynowski; I. Volobouev; J. Ye; M. Artuso; A. Efimov; F. Frasconi; M. Gao; M. Goldberg; D. He; S. Kopp; G. C. Moneti; R. Mountain; Y. Mukhin; S. Schuh; T. Skwarnicki
Using data taken with the CLEO II detector, we present the first full angular analysis in the color-suppressed modes B{sup 0} {yields} J/{psi} K*{sup 0} and B{sup +} {yields} J/{psi} K*{sup +}. This leads to a complete determination of the decay amplitudes of these modes. In addition, we update the branching fractions for B {yields} J/{psi} K and B {yields} J/{psi} K*.
