J. M. Bishop

Publications (24)3.95 Total impact

• Article: Observation of the vector meson Cabibbo suppressed decay D+ -> ϱ0μ+ν

  P. L. Frabetti, H. W. K. Cheung, J. P. Cumalat, C. Dallapiccola, J. F. Ginkel, W. E. Johns, M. S. Nehring, J. N. Butler, S. Cihangir, I. Gaines, [......], V. S. Paolone, P. M. Yager, J. R. Wilson, P. D. Sheldon, F. Davenport, K. Danyo, T. Handler, B. G. Cheon, J. S. Kang, K. Y. Kim
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  ABSTRACT: We report on the first statistically significant observation of the vector meson Cabibbo suppressed semileptonic decayD+ -> ϱ0μ+ν. We measure the branching ratio of the decay mode D+ -> ϱ0μ+ν (plus possible unobserved γ from D+ -> η'μ+ν, η' -> γϱ0) with respect to the decay mode D+ ->K*0 μ+ν to be BR (D+ -> ϱ0μ+ν)/BR (D+ -> K*0μ+ν) = 0.079 +/- 0.019 (stat) +/- 0.013 (syst). Data were collected by Fermilab photoproduction experiment E687.
  Physics Letters B 01/1997; 391:235-242. · 3.95 Impact Factor
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  Available from: Pier Luigi Frabetti

  Article: Charm-Anticharm Asymmetries in High Energy Photoproduction

  P L Frabetti, H W K Cheung, J P Cumalat, C Dallapiccola, J. F. Ginkel, W E Johns, M. S. Nehring, J N Butler, S Cihangir, I Gaines, [......], J. M. Bishop, N M Cason, C. J. Kennedy, G N Kim, T. F. Lin, D. L. Puseljic, R C Ruchti, W D Shephard, J. A. Swiatek, Z. Y. Wu
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  ABSTRACT: We report measurements of charm particle production asymmetries from the Fermilab photoproduction experiment E687. An asymmetry in the rate of production of charm versus anticharm particles is expected to arise primarily from fragmentation effects. We observe statistically significant asymmetries in the photoproduction of D + , D + and D 0 mesons and find small (but statistically weak) asymmetries in the production of the D + s meson and the + c baryon. Our inclusive photoproduction asymmetries are compared to predictions from nonperturbative models of charm quark fragmentation. PACS numbers: 13.60.Le, 13.60.Rj Typeset using REVT E X From a data sample of approximately 55000 charm particle decays obtained using silicon vertex detectors and a forward multiparticle spectrometer, we have investigated the production asymmetry between charm and anticharm hadrons produced by the interaction of high energy photons with a Beryllium target. The data were recorded by the E687 Colla...
  02/1996;
• Article: New results on heavy-flavor photoproduction from the E687 experiment at FNAL

  Collaboration, P. L. Frabetti, H. W. K. Cheung, J. P. Cumalat, C. Dallapiccola, J. F. Ginkel, S. V. Greene, W. E. Johns, M. S. Nehring, J. N. Butler, [......], J. R. Wilson, P. D. Sheldon, F. Davenport, J. F. Filaseta, G. R. Blackett, M. Pisharody, T. Handler, B. G. Cheon, J. S. Kang, K. Y. Kim
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  ABSTRACT: The new results on charm from E687 photoproduction experiment are presented. They follow from very high statistic measurents and cover a wide variety of physics items in the charm sector. Charm photoproduction studies, very accurate lifetime measurements, analysis of several semi-leptonic decays and hadronic decays are discussed. Particular attention has been devoted to compare E687 results with other experiments.
  Il Nuovo Cimento A 09/1994; 107(10):2025-2043.
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  Available from: Pier Luigi Frabetti

  Article: Study of charged hadronic four-body decays of the D0 meson

  P.L. Frabetti, H.W.K. Cheung, J.P. Cumalat, C. Dallapiccola, J.F. Ginkel, S.V. Greene, W.E. Johns, M.S. Nehring, J.N. Butler, S. Cihangir, [......], J.R. Wilson, P.D. Sheldon, F. Davenport, G.R. Blackett, K. Danyo, M. Pisharody, T. Handler, B.G. Cheon, J.S. Kang, K.Y. Kim
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  ABSTRACT: Charged hadronic four-body decays of D0 mesons have been studied in the E687 photoproduction experiment at Fermilab. Branching ratios relative to the D0 → K−π+π+π− decay mode for the Cabibbo-suppressed decays D0 → π−π+π−π+, D0 → K−K+π−π+ have been measured and the first evidence of the D0 → K−K+K−π+ decay mode is reported. An analysis of the D0 → K−K+π−π+ resonance structure is also presented.
  Physics Letters B.
• Article: Analysis of three D → Kππ Dalitz plots

  P.L. Frabetti, H.W.K. Cheung, J.P. Cumalat, C. Dallapiccola, J.F. Ginkel, S.V. Greene, W.E. Johns, M.S. Nehring, J.N. Butler, S. Cihangir, [......], P.M. Yager, J.R. Wilson, P.D. Sheldon, F. Davenport, G.R. Blackett, M. Pisharody, T. Handler, B.G. Cheon, J.S. Kang, K.Y. Kim
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  ABSTRACT: Analysis of three D → Kππ Dalitz plots is presented using data collected by the Fermilab high energy photoproduction experiment E687. Our data are fit to a model consisting of a sum of Breit-Wigner amplitudes for the intermediate two-body resonant decay modes and a constant term for the nonresonant contribution. We extract branching fractions and relative phases and compare them to the results obtained in other experiments. Although this model qualitatively reproduces many features of our data, statistically significant discrepancies are observed in some of our fits.
  Physics Letters B.
• Article: Study of D0→KS0π+π− and D0→KS0K+K− in high energy photoproduction

  P.L. Frabetti, C.W. Bogart, H.W.K. Cheung, S. Culy, J.P. Cumalat, J.N. Butler, F. Davenport, I. Gaines, P.H. Garbincius, S. Gourlay, [......], E.J. Mannel, R.J. Mountain, D.L. Puseljic, R.C. Ruchti, W.D. Shephard, M.E. Zanabria, G. Boca, S.P. Ratti, P. Vitulo, A. Lopez
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  ABSTRACT: Analysis of the resonant and non-resonant branching fractions for the decays D0→KS0π+π−and D0→KS0K+K− is presented. For the D0→KS0π+π− decay, a fit to the observed Dalitz plot was performed to determine the complex amplitudes of the sub-component modes. For the D0→KS0K+K− decay, measurements of the branching ratios D0→KS0K+K− (inclusive), D0→KS0φ, and D0→KS0(K+K−)non-φ relative to the D0→KS0π+π− mode are reported. The data were collected by the Fermilab high energy photoproduction experiment E687.
  Physics Letters B.
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  Available from: Pier Luigi Frabetti

  Article: Evidence for a narrow dip structure at 1.9 GeV/c2 in 3π+3π− diffractive photoproduction

  P.L. Frabetti, H.W.K. Cheung, J.P. Cumalat, C. Dallapiccola, J.F. Ginkel, W.E. Johns, M.S. Nehring, E.W. Vaandering, J.N. Butler, S. Cihangir, [......], F. Davenport, K. Cho, K. Danyo, T. Handler, B.G. Cheon, Y.S. Chung, J.S. Kang, K.Y. Kim, K.B. Lee, S.S. Myung
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  ABSTRACT: A narrow dip structure has been observed at 1.9 GeV/c2 in a study of diffractive photoproduction of the 3π+3π− final state performed by the Fermilab experiment E687.
  Physics Letters B.
• Article: First evidence of Ωc0→Ω−π+

  P.L. Frabetti, H.W.K. Cheung, J.P. Cumalat, C. Dallapiccola, J.F. Ginkel, S.V. Greene, W.E. Johns, M.S. Nehring, J.N. Butler, S. Cihangir, [......], J.R. Wilson, P.D. Sheldon, F. Davenport, J.F. Filasetta, G.R. Blackett, M. Pisharody, T. Handler, B.G. Cheon, J.S. Kang, K.Y. Kim
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  ABSTRACT: We report evidence of a narrow resonance at a mass of 2705.9 ± 3.3 ± 2.0 MeV/c2 in the final state Ω−π+ and the charge conjugate. The mass and width support the interpretation of a weakly decaying doubly strange charmed baryon, the . Limits on the relative branching ratios for and are also presented.
  Physics Letters B.
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  Available from: Gabriele Gianini

  Article: Search for rare and forbidden decays of the charmed meson D+

  P.L. Frabetti, H.W.K. Cheung, J.P. Cumalat, C. Dallapiccola, J.F. Ginkel, W.E. Johns, M.S. Nehring, E.W. Vaandering, J.N. Butler, S. Cihangir, [......], P.D. Sheldon, F. Davenport, K. Danyo, T. Handler, B.G. Cheon, Y.S. Chung, J.S. Kang, K.Y. Kim, K.B. Lee, S.S. Myung
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  ABSTRACT: We report on the results of a search for fourteen flavor changing neutral current, lepton number violating, or lepton family number violating decays of the charmed meson D+ in the large charm sample recorded by the Fermilab photoproduction experiment E687. No evidence is seen for these rare and standard-model-forbidden decays, of the form D+ → h±ℓ∓ℓ+ (with h = π, K and ℓ = e, μ); we determine 90% confidence level upper limits on their absolute branching fractions in the range (9–20) × 10−5.
  Physics Letters B.
• Article: Precise measurements of the D0 and D+ meson lifetimes

  P.L. Frabetti, H.W.K. Cheung, J.P. Cumalat, C. Dallapiccola, J.F. Ginkel, S.V. Greene, W.E. Johns, M.S. Nehring, J.N. Butler, S. Cihangir, [......], J.R. Wilson, P.D. Sheldon, F. Davenport, J.F. Filaseta, G.R. Blackett, M. Pisharody, T. Handler, B.G. Cheon, J.S. Kang, K.Y. Kim
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  ABSTRACT: We report precise measurements of the D0 and D+ meson lifetimes by the E687 Collaboration at Fermilab. The measurements have been made using 16000 fully reconstructed decays of the D0 into the K−π+ and K−π+π−π+ final states and 9000 decays of the D+ into the K−π+π+ final state. The lifetimes of the D0 and D+ mesons are measured to be 0.413±0.004±0.003 ps and 1.048±0.015±01011 ps respectively.
  Physics Letters B.
• Article: A measurement of the Cabibbo-suppressed decays D0 → π−π+ and D0 → K−K+

  P.L. Frabetti, H.W.K. Cheung, J.P. Cumalat, C. Dallapiccola, J.F. Ginkel, S.V. Greene, W.E. Johns, M.S. Nehring, J.N. Butler, S. Cihangir, [......], J.R. Wilson, P.D. Sheldon, F. Davenport, J.F. Filaseta, G.R. Blackett, M. Pisharody, T. Handler, B.G. Cheon, J.S. Kang, K.Y. Kim
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  ABSTRACT: We report a measurement of the relative branching ratio of two Cabibbo-suppressed decay modes: D0 → π−π+ and D0 → K−K+. The data were accumulated in the 1990–1991 fixed target run of Fermilab high energy photoproduction experiment E687. The branching ratios of these modes relative to the Cabibbo-allowed decay D0 → K−π+ are also presented. The relative branching ratios are measured to be Γ(D0 → KK)/Γ(D0 → ππ) = 2.53 ± 0.46 ± 0.19, Γ(D0 → KK)/Γ(D0 → Kπ) = 0.109 ± 0.007 ± 0.009, and Γ(D0 → ππ)/Γ(D0 → Kπ) = 0.043 ± 0.007 ± 0.003.
  Physics Letters B.
• Article: Description and performance of the Fermilab E687 spectrometer

  P.L. Frabetti, V. Giordano, G. Molinari, C.W. Bogart, H.W.K. Cheung, P. Coteus, S. Culy, J.P. Cumalat, C. Dallapiccola, E. Erdos, [......], R. Diaferia, S.P. Ratti, C. Riccardi, P. Vitulo, A. Lopez, H. Mendez, V. Paolone, P.M. Yager, J.R. Wilson, J.F. Filasetta
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  ABSTRACT: The magnetic spectrometer and charged particle tracking system used in Fermilab experiment 687 to study the photoproduction and decay of charm particles are described in detail. The photons are produced by a wideband electron beam which can operate at energies up to 600 GeV/c. The spectrometer consists of a high resolution silicon microstrip detector, a large aperture dipole magnet, proportional chambers, a second large aperture dipole, and more proportional chambers. Three multi-cell threshold Cherenkov counters provide charged particle identification. The tracking system is capable of resolving the secondary decay vertices of charm and beauty mesons and baryons from the primary interaction vertex. It also determines the invariant mass of the multibody final states of particles containing heavy quarks with excellent resolution. The particle identification system allows one to identify kaons and protons present in these final states clearly. This collection of detectors produces very clean signals for charm particles and permits one to make many cross checks of the apparatus. The performance is illustrated for a variety of charm signals. Of particular interest is a description of the tracking through the silicon microstrip detector and its use in isolating downstream decay vertices. Two complementary approaches to the reconstruction of secondary decay vertices are presented and insight is gained by comparing their strengths and weaknesses.
  Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.
• Article: Doubly and singly Cabibbo suppressed charm decays into the K+π−π+ final state

  P.L. Frabetti, H.W.K. Cheung, J.P. Cumalat, C. Dallapiccola, J.F. Ginkel, W.E. Johns, M.S. Nehring, J.N. Butler, S. Cihangir, I. Gaines, [......], P.M. Yager, J.R. Wilson, P.D. Sheldon, F. Davenport, G.R. Blackett, M. Pisharody, T. Handler, B.G. Cheon, J.S. Kang, K.Y. Kim
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  ABSTRACT: Branching ratios and upper limits at 90% confidence level for D+ and Ds+ → K+π−π+ decays collected in Fermilab photoproduction experiment E-687 are reported. The D+ results are: , , and . The Ds+ results are: , , and .
  Physics Letters B.
• Article: Study of higher mass charm baryons decaying to Λc+

  P.L. Frabetti, H.W.K. Cheung, J.P. Cumalat, C. Dallapiccola, J.F. Ginkel, W.E. Johns, M.S. Nehring, J.N. Butler, S. Cihangir, I. Gaines, [......], J.R. Wilson, P.D. Sheldon, F. Davenport, G.R. Blackett, K. Danyo, M. Pisharody, T. Handler, B.G. Cheon, J.S. Kang, K.Y. Kim
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  ABSTRACT: We report on the study of charm baryons decaying to Λc+: Λc★+(2625) → Λc+π+π−, Λc★+(2593) → Λc+π+π−, Σc0 → Λc+π− and Σc++ → Λc+π+. We present a confirmation of the state (2593) and determine its mass difference to be M(Λc★+(2593)) − M(Λc+) = 309.2 ± 0.7 ± 0.3 MeV/c2. We determine the lower limit on the resonant branching ratio to be (90% c.l.). We also measure the mass differences M(Σc0) − M(Λc+) = 166.6±0.5±0.6 MeV/c2 and M(Σc++) − M(Λc+) = 167.6±0.6±0.6 MeV/c2. Finally, we measure the relative photoproduction cross sections for Λc★+ and Σc with respect to the (inclusive) photoproduction cross section for Λc+.
  Physics Letters B.
• Article: Observation and mass measurement of Ωc0 → Σ+K−K−π+

  P.L. Frabetti, H.W.K. Cheung, J.P. Cumalat, C. Dallapiccola, J.F. Ginkel, S.V. Greene, W.E. Johns, M.S. Nehring, J.N. Butler, S. Cihangir, [......], P.M. Yager, J.R. Wilson, P.D. Sheldon, F. Davenport, G.R. Blackett, M. Pisharody, T. Handler, B.G. Cheon, J.S. Kang, K.Y. Kim
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  ABSTRACT: We present evidence for the in a new decay mode , for which we find 42.5 ± 8.8 events with a mass of . The data are from Fermilab high energy photoproduction experiment E687.
  Physics Letters B.
• Article: Analysis of the D+, Ds+ → K+K−π+ Dalitz plots

  P.L. Frabetti, H.W.K. Cheung, J.P. Cumalat, C. Dallapiccola, J.F. Ginkel, S.V. Greene, W.E. Johns, M.S. Nehring, J.N. Butler, S. Cihangir, [......], P.M. Yager, J.R. Wilson, P.D. Sheldon, F. Davenport, G.R. Blackett, M. Pisharody, T. Handler, B.G. Cheon, J.S. Kang, K.Y. Kim
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  ABSTRACT: Amplitude analyses of the D+ and Ds+ → K+K−π+ Dalitz plots are presented using data collected by the Fermilab high energy photoproduction experiment E687. Our data are fit to a model consisting of a sum of Breit-Wigner amplitudes for the intermediate two-body resonant decay modes. We extract decay fractions and relative phases. These results are used to infer new branching ratios for D+ → K+K−π+ inclusive as well as the Φπ+ and channels.
  Physics Letters B.
• Article: Measurement of the decays D0 → π+π+π−π−, D0 → K−K+ and D+s → фπ+π+π−

  P.L. Frabetti, C.W. Bogart, H.W.K. Cheung, S. Culy, J.P. Cumalat, J.N. Butler, F. Davenport, I. Gaines, P.H. Garbincius, S. Gourlay, [......], E.J. Mannel, R.J. Mountain, D.L. Puseljic, R.C. Ruchti, W.D. Shephard, M.E. Zanabria, V. Arena, S.P. Ratti, P. Vitulo, A. Lopez
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  ABSTRACT: We present measurements of the branching ratios for two Cabibbo suppressed decays of the D0 meson, D0 → π+π+π−π− and D0 → K−K+, and for the decay . The physics signals were extracted from a data sample consisting of 60 million triggers, collected by Fermilab Photoproduction Experiment E687 from December 1987 to February 1988. The relative branching ratios are measured to be: Γ(D0 → 4π)/Γ(D0 → K3π) = 0.108±0.024±0.008, Γ(D0 → KK)/Γ(D0 → Kπ) = 0.138±0.027 ±0.010 and .
  Physics Letters B.
• Article: A measurement of Γ (DS+ → φμ+ν) /Γ (DS+ → φπ+)

  P.L. Frabetti, H.W.K. Cheung, J.P. Cumalat, C. Dallapiccola, J.F. Ginkel, S.V. Greene, W.E. Johns, M.S. Nehring, J.N. Butler, S. Cihangir, [......], J.R. Wilson, P.D. Sheldon, F. Davenport, J.F. Filaseta, G.R. Blackett, M. Pisharody, T. Handler, B.G. Cheon, J.S. Kang, K.Y. Kim
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  ABSTRACT: Fermilab high-energy photoproduction experiment E687 measures a branching ratio of Γ (DS+ → φμ+ν) /Γ (DS+ → φμ+) = 0.58 ± 0.17 (stat) ± 0.07 (sys). This branching ratio is combined with theoretical inputs to obtain a new measurement of the DS+ absolute branching ratio of Γ (DS+ → φμ+) / Γ (DS+ → all) = 0.031 ± 0.009 (stat 0.005 (sys) ± 0.004 (theoretical).
  Physics Letters B.
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  Available from: Gabriele Gianini

  Article: Analysis of the decay mode D0 → K−μ+νμ

  P.L. Frabetti, H.W.K. Cheung, J.P. Cumalat, C. Dallapiccola, J.F. Ginkel, S.V. Greene, W.E. Johns, M.S. Nehring, J.N. Butler, S. Cihangir, [......], J.R. Wilson, P.D. Sheldon, F. Davenport, G.R. Blackett, K. Danyo, M. Pisharody, T. Handler, B.G. Cheon, J.S. Kang, K.Y. Kim
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  ABSTRACT: Studies of the decay D0 → K−μ+νμ are reported by Fermilab photoproduction experiment E687. The ratio is determined to be 0.852 ± 0.034 (statistical) ± 0.028 (systematic). Using this result and an isospin argument we infer the ratio . The pole mass from the single pole form factor is measured to be Mpole = 1.87−0.08−0.06+0.11+0.07 GeV/c2. Using Mpole and , we calculate |f + (0)| = 0.71 ± 0.03 ± 0.03. We also measure the ratio .
  Physics Letters B.
• Article: Measurement of the form factors for the decay D+s → φμ+ν

  P.L. Frabetti, H.W.K. Cheung, J.P. Cumalat, D. Dallapiccola, J.F. Ginkel, S.V. Greene, W.E. Johns, M.S. Nehring, J.N. Butler, S. Cihangir, [......], J.R. Wilson, P.D. Sheldon, F. Davenport, J.F. Filaseta, G.R. Blackett, M. Pisharody, T. Handler, B.G. Cheon, J.S. Kang, K.Y. Kim
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  ABSTRACT: The fermilab high-energy photoproduction experiment E687 provides a sample of approximately 90 events of the decay mode D+s→ φμ+ν. The ratios of the form factors governing the decay are measured to be Rv=1.8±0.9±0.2 and R2= 1.1±0.8±0.1, implying a polarization of for the electron decay, consistent with our measurement of the form factor for the decay .
  Physics Letters B.