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29 results on '"D. Kreinick"'

1. Experimental results on the decay sequences ψ'(3685)→γPc/χ→γγJ/ψ,γπ+π−,γK+K− and the decays ψ'→ηJ/ψ,π°J/ψ

Author

G. Grindhammer, Guenter Wolf, H. U. Martyn, H. Lierl, Shinya Yamada, D. Cords, P. Schmüser, W. Fues, K. Sauerberg, O. Römer, W. De Boer, W. Koch, D.W. Schmitz, W. Braunschweig, H. G. Sander, G. Poelz, G. Buschhorn, H. Hultschig, A. Petersen, K.C. Moffeit, Ch. Von Gagern, W. Sturm, B. H. Wiik, W. Wallraff, B. Gunderson, M. Schliwa, R. Kotthaus, Horst Oberlack, R. Felst, D. Kreinick, J. Ringel, S. Orito, R. Fries, A. Shapira, P. Joos, E. Gadermann, W. A. McNelly, K. H. Mess, G. Mikenberg, L. Ludwig, H. Krehbiel, D. Notz, R. Rüsch, U. Kötz, R. Brandelik, Teruhiro Suda, Y. Totsuka, and H. L. Lynch

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation
Published
1979
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2. radiative decays into ππγ and KKγ

Author

O. Römer, D. Notz, R. Rüsch, K. H. Mess, D. Cords, U. Kötz, Shinya Yamada, W. Braunschweig, P. Schmüser, B. Gunderson, H. Krehbiel, W. Fues, K. Sauerberg, D. Kreinick, A. Petersen, M. Schliwa, K. C. Moffeit, R. Brandelik, E. Gadermann, Gy. Wolf, H. Hultschig, B. H. Wiik, S. Orito, Teruhiro Suda, H. U. Martyn, Y. Totsuka, W. A. McNeely, R. Felst, H. Lierl, H. L. Lynch, P. Joos, R. Kotthaus, G. Mikenberg, Ch. Von Gagern, D.W. Schmitz, W. De Boer, G. Grindhammer, G. Buschhorn, W. Sturm, R. Fries, W. Wallraff, Horst Oberlack, A. Shapira, J. Ringel, J. Ludwig, H. G. Sander, W. Koch, and G. Poelz

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Theoretical physics, Spectrometer, Radiative transfer, DORIS (geodesy)
Abstract

The radiative decays of J ψ into f/γ, f′γ, ππγ and KKγ have been measured using the double arm spectrometer DASP at DORIS. We find B(J/φ→fγ)=(J/φ→fγ)/(J/φ→all)=(0.9±0.3)×10−3 to (1.5±0.4)×10−3 depending on the multi- pole mode of the J ψ decay and that B( J /φ→ f ′γ) B( J /γ→ f γ)⪕ 1 3 .

Published
1978
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3. The three photon final state produced in e+e− collision at 3.6 GeV and at the ψ′

Author

K. C. Moffeit, W. A. McNeely, G. Buschhorn, M. Schliwa, A. Petersen, W. Sturm, W. Deboer, H. U. Martyn, H. Krehbiel, Teruhiro Suda, W. Braunschweig, J. Ringel, Y. Totsuka, R. Kotthaus, K. Bekkelman, D. Cords, E. Gadermann, R. Rüsch, G. Grindhammer, P. Joos, D. Kreinick, H. Hultschig, P. Schmüser, J. Ludwig, B. Gunderson, H. Lierl, R. Fries, B. H. Wiik, W. Wallraff, K. Sauerberg, S. Orito, Shinya Yamada, H. G. Sander, K. P. Pretzl, U. Kötz, R. Felst, D.W. Schmitz, Horst Oberlack, Gy. Wolf, W. Koch, G. Poelz, and K. H. Mess

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Photon, Spectrometer, Radiative transfer, State (functional analysis), Atomic physics, Collision, Resonance (particle physics)
Abstract

The three photon final state produced in e + e − collisions at 3.6 GeV and at the mass of the ψ′ resonance has been measured using the nonmagnetic part of the double arm spectrometer DASP. A total of 31 events is observed outside the resonance region compared to 35.1 events predicted from QED. At the mass of the ψ′ 49 events are observed compared to 37.2 events expected from QED. Limits on radiative decays via intermediate states are given.

Published
1977
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4. On the semileptonic decay of charmed hadrons

Author

O. Römer, J. Ringel, R. Kotthaus, P. Schmüser, W. Fues, K. Sauerberg, Y. Totsuka, W. Wallraff, H. Hultschig, B. H. Wiik, K. H. Mess, Ch. Von Gagern, Horst Oberlack, J. Ludwig, H. L. Lynch, S. Orito, U. Kötz, R. Fries, R. Felst, Shinya Yamada, A. Petersen, W. A. McNeely, R. Brandelik, D. Cords, G. Buschhorn, K. C. Moffeit, M. Schliwa, H. Krehbiel, W. Koch, D. Kreinick, G. Poelz, W. Sturm, P. Joos, D. Notz, R. Rüsch, Teruhiro Suda, Gy. Wolf, D.W. Schmitz, E. Gadermann, H. G. Sander, G. Mikenberg, W. Braunschweig, B. Gunderson, H. Lierl, W. De Boer, H. U. Martyn, and G. Grindhammer

Subjects
Physics, Semileptonic decay, Nuclear and High Energy Physics, Particle physics, Antiparticle, Meson, Branching fraction, Electron–positron annihilation, High Energy Physics::Phenomenology, Elementary particle, Nuclear physics, Particle decay, High Energy Physics::Experiment, Nuclear Experiment, Lepton
Abstract

The semileptonic and leptonic decay modes of charmed hadrons produced in e+e− collisions above 4 GeV in the cm have been investigated by selecting events with a single electron plus at least two charged tracks. The electron momentum spectrum peaks near 0.5 GeV/c with few events above 0.7 GeV/c. The spectrum excludes large rates for the decays D → e v e and D → e v e π , but is compatible with D → e v e K ∗ (892) , D → e v e K or a mixture of both. The semileptonic branching ratio is obtained both by comparing the inclusive electron cross section with the total cross section attributable to charm, and by studying the fraction of events containing a second electron. The semileptonic charm branching ratios obtained are 0.11 ± 0.03 and 0.16 ± 0.06 respectively. A single event with three electrons and hadrons is found, consistent with the estimated background. The 90% confidence upper limit for σ(e+e− → 3e + hadrons) is 0.1 nb.

Published
1977
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5. Two-body hadronic decays of the 3.1 GeV resonance

Author

S. Orito, M. Schliwa, W. Wallraff, Horst Oberlack, Shinya Yamada, R. Kotthaus, U. Kötz, D. Kreinick, H. G. Sander, Y. Totsuka, H. Krehbiel, K. H. Mess, H. Hultschig, Teruhiro Suda, B. H. Wiik, R. Felst, P. Joos, G. Vogel, W. Braunschweig, J. Ludwig, D.W. Schmitz, W. Koch, U. Kruse, G. Poelz, K. Pretz, E. Gadermann, Gy. Wolf, H. U. Martyn, K. Berkelman, G. Grindhammer, P. Schmüser, H. Lierl, K. Sauerberg, G. Buschhorn, W. Sturm, K. C. Moffeit, and D. Cords

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Branching fraction, Hadron
Abstract

Hadronic two body decays of the 3.1 GeV resonance were measured and the following branching ratios were obtained: Γπ+π−/Γμμ Γ p p / Γ μ μμ = 0.036 ± 0.010 assuming the p p decay distribution is ≈ + cos2θ.

Published
1975
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6. and ψ′ decays into two hadrons

Author

R. Kotthaus, Guenter Wolf, M. Schliwa, B. Gittelman, Y. Totsuka, G. Buschhorn, S. Orito, W. Sturm, B. Gunderson, W. De Boer, H. G. Sander, W. Wallraff, J. Ringel, G. Grindhammer, Horst Oberlack, H. Krehbiel, Shinya Yamada, J. Ludwig, H. U. Martyn, H. Lierl, W. Koch, U. Kruse, G. Poelz, U. Kötz, K. P. Pretzl, K. Berkelman, W. Braunschweig, D. Kreinick, Teruhiro Suda, Annette Petersen, W. A. McNeely, K. H. Mess, D.W. Schmitz, E. Gadermann, P. Joos, K. C. Moffeit, D. Cords, P. Schmüser, K. Sauerberg, H. Hultschig, B. H. Wiik, and R. Felst

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Hadron, Branching (polymer chemistry)
Abstract

Branching ratios have been determined for the decays of J ψ and ψ ′ into π+π−, K+K−, p p , π±ϱ∓ and K ± K ∗ (892) ∓ . Results on a search for other two body decays of J ψ and ψ′ are given. Also presented are values for the π and K from factors at s = 3.1 and 3.7 GeV .

Published
1976
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7. Production of charged kaons by e+e− collisions between √s = 3.6 and 5 GeV

Author

A. Petersen, R. Rüsch, W. Wallraff, Horst Oberlack, M. Schliwa, O. Römer, H. Lierl, W. A. McNeely, W. Koch, J. Ringel, Gy. Wolf, D. Cords, H. Hultschig, Shinya Yamada, B. H. Wiik, K. C. Moffeit, W. De Boer, G. Poelz, K. H. Mess, P. Joos, S. Orito, J. Ludwig, W. Braunschweig, R. Felst, G. Grindhammer, P. Schmüser, K. Sauerberg, R. Kotthaus, Teruhiro Suda, G. Buschhorn, B. Gunderson, D.W. Schmitz, Y. Totsuka, W. Sturm, D. Kreinick, R. Fries, E. Gadermann, R. Brandelik, H. U. Martyn, U. Kötz, H. G. Sander, and H. Krehbiel

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Cross section (physics)
Abstract

The total cross section for K ± production in e + e − collisions was measured for cms energies between 3.6 and 5 GeV and was found to increase by a factor of 2–3 from 3.6 to 4.1 GeV.

Published
1977
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8. π0andρ0photoproduction from 6 to 18 GeV

Author

D. Kreinick, K. Young, F. J. Sciulli, B. A. Sherwood, B. C. Barish, J. Pine, A. V. Tollestrup, C. W. Peck, and R. Gomez

Subjects
Physics, Nuclear physics, Momentum, Photon, Nuclear Theory, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Differential (mathematics)
Abstract

Differential cross sections for π0 and ρ0 photoproduction from protons have been measured at photon energies 6, 12, and 18 GeV and momentum transfers 0.5 to 3 (GeV/c)^2.

Published
1974
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9. Charged pion, kaon and nucleon production by e+e− annihilation for c.m. energies between 3.6 and 5.2 GeV

Author

P. Joos, M. Schliwa, D. Kreinick, A. Petersen, W. Koch, G. Poelz, B. Gunderson, K. C. Moffeit, Gy. Wolf, W. Wallraff, Peter Schmueser, Horst Oberlack, O. Römer, G. Grindhammer, W. A. McNeely, W. Braunschweig, C. Von Gagern, H. Hultschig, B. H. Wiik, R. Brandelik, Teruhiro Suda, Y. Totsuka, G. Buschhorn, R. Kotthaus, H. L. Lynch, H. Krehbiel, S. Orito, Shinya Yamada, D. Notz, R. Felst, W. Sturm, R. Rüsch, J. Ringel, D. Cords, R. Fries, A. Shapira, W. Fues, K. Sauerberg, J. Ludwig, H. U. Martyn, H. G. Sander, H. Lierl, U. Kötz, W. De Boer, D.W. Schmitz, E. Gadermann, G. Mikenberg, and K. H. Mess

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Scattering, Electron–positron annihilation, High Energy Physics::Phenomenology, Spectral line, Nuclear physics, Pion, High Energy Physics::Experiment, Charm (quantum number), Nuclear Experiment, Nucleon, Scaling
Abstract

Inclusive production of ifπ±, K± and p has been studied near charm threshold for c.m. energies between 3.6 and 5.2 GeV. Differential and scaling cross sections together with particle multiplicities have been determinated. By comparing data below and above charm threshold the charm contribution to if π± and K± production has been extracted. A comparison has been made between inclusice p production and inelastic electron-proton scattering. To study differences between three-gluon annihilation and two-quark production of the spectra from J/ decay and from non-resonant production at 3.6 GeV has been compared.

Published
1979
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10. A measurement of large angle e+e− scattering at the 3100 MeV resonance

Author

K. Berkelman, Y. Totsuka, H. G. Sander, R. Kotthaus, Shinya Yamada, P. Schmüser, W. Koch, D. Notz, K. Sauerberg, H. Hultschig, K.C. Moffeitt, G. Poelz, H.G. Grindhammer, Gy. Wolf, B. H. Wiik, C.L. Jordan, P. Joos, D. Cords, K. H. Mess, H. Krehbiel, R. Felst, Teruhiro Suda, H. Lierl, S. Orito, U. Kruse, M. Schliwa, G. Buschhorn, W. Sturm, W. Braunschweig, D. Kreinick, G. Vogel, K. P. Pretzl, DASP-Collaboration, D.W. Schmitz, U. Martyn, E. Gadermann, J. Ludwig, W. Wallraff, Horst Oberlack, and U. Kötz

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Cross section (physics), Angular distribution, Scattering, Scattering length, Atomic physics, Resonance (particle physics)
Abstract

Elastic e + e − scattering has been measured at total energies covering the newly found resonance at 3100 MeV. The angular distribution is consistent with spin-parity 1 - , and the cross section integrated over energy yields Г 2 ee /Г tot = 0.23 ± 0.05 keV for the resonance.

Published
1974
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11. Momentum spectra of charged hadrons from the decays of and ψ'

Author

Shinya Yamada, H. Hultschig, J. Ringel, D. Cords, B. H. Wiik, D.W. Schmitz, P. Joos, Y. Totsuka, K. C. Moffeit, J. Ludwig, E. Gadermann, M. Schliwa, Guenter Wolf, P. Schmüser, K. Sauerberg, W. Braunschweig, W. Wallraff, Horst Oberlack, R. Kotthaus, K. P. Pretzl, Teruhiro Suda, S. Orito, W. Koch, Annette Petersen, G. Poelz, D. Kreinick, U. Kötz, K. H. Mess, H. G. Sander, U. Kruse, R. Felst, W. A. McNeely, H. Krehbiel, K. Berkelman, H. U. Martyn, W. De Boer, B. Gunderson, G. Grindhammer, B. Gittelman, G. Buschhorn, W. Sturm, and H. Lierl

Subjects
Nuclear physics, Physics, Momentum, Nuclear and High Energy Physics, Pion, Nuclear magnetic resonance, Nuclear Theory, Hadron, Particle, High Energy Physics::Experiment, Nuclear Experiment, Nucleon, Spectral line
Abstract

Momentum spectra and particle ratios are presented for charged pions, kaons and nucleons emitted in the decays of J ψ and ψ'.

Published
1976
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12. Measurements of tau decay modes and a precise determination of the mass

Author

A. Petersen, W. Wallraff, Horst Oberlack, K. H. Mess, D. Cords, U. Kötz, W. Braunschweig, P. Schmüser, O. Römer, W. Fues, K. Sauerberg, Y. Totsuka, R. Kotthaus, H. L. Lynch, Shinya Yamada, K. C. Moffeit, G. Buschhorn, D. Notz, H. G. Sander, R. Fries, H. Hultschig, B. H. Wiik, R. Rüsch, R. Felst, Teruhiro Suda, W. Koch, G. Poelz, J. Ringel, M. Schliwa, P. Joos, R. Brandelik, J. Ludwig, H. Krehbiel, W. A. McNeely, Gy. Wolf, W. Sturm, Ch. Von Gagern, H. Lierl, D. Kreinick, B. Gunderson, W. De Boer, G. Grindhammer, H. U. Martyn, S. Orito, E. Gadermann, G. Mikenberg, and D.W. Schmitz

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Photon, Electron–positron annihilation, Hadron
Abstract

The cross sections for e+e− → e+(μ+ + non showering track + any photons have been measured for cm energies between 3.1 GeV and 5.2 GeV. We observe τ-pair production below the thresholdfor charm production and determine the τ mass to be 1.807 ± 0.020 GeV from a fit to the energy dependence of the cross section. The ration of the leptonic branching ratios Bμ/Be = 0.92 ± 0.32 is consistent with eμ-universality. The following branching ratios are determined for a V-A coupling: B(τ → ν τ e ν ) = B(τ → ν τ μ ν ) = 0.182 + 0.028 . B(τ → ντ + charged hadron + any photons) = 0.29 ± 0.11, B(τ → ντ + three or more charged hadrons + any photons) = 0.35 ± 0.11.

Published
1978
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13. Radiative decays of the and evidence for a new heavy resonance

Author

J. Ringel, H. Krehbiel, H. Hultschig, B. H. Wiik, Shinya Yamada, J. Ludwig, R. Felst, W. A. McNeely, B. Gunderson, P. Joos, H. G. Sander, Gy. Wolf, G. Grindhammer, R. Kotthaus, G. Buschhorn, W. Sturm, K. Berkelman, S. Orito, A. Petersen, D. Kreinick, H. Lierl, W. Koch, H. U. Martyn, W. Deboer, Teruhiro Suda, Y. Totsuka, D.W. Schmitz, G. Poelz, M. Schliwa, E. Gadermann, K. H. Mess, K. P. Pretzl, P. Schmüser, K. Sauerberg, U. Kötz, K. C. Moffeit, W. Braunschweig, D. Cords, W. Wallraff, and Horst Oberlack

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Photon, Spectrometer, Radiative transfer, Mass spectrum, High Energy Physics::Experiment
Abstract

The three photon final state produced in e+e− collisions has been measured at the mass of the J ψ resonance using the nonmagnetic part of the double arm spectrometer DASP. The decays J ψ → ηγ, η'γ and πoγ were observed and their branching ratios are given. A four standard deviation signal was observed in the γγ mass spectrum at a mass of (2.83 ± 0.03) GeV. An upper limit is given for the direct decay J ψ → 3γ .

Published
1977
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14. On the origin of inclusive electron events in e+e− annihilation between 3.6 and 5.2 GeV

Author

K. H. Mess, O. Römer, B. Gunderson, D.W. Schmitz, P. Joos, H. Lierl, W. Koch, Ch. Von Gagern, R. Kotthaus, A. Petersen, Teruhiro Suda, J. Ringel, W. De Boer, W. A. McNeely, G. Poelz, Y. Totsuka, H. L. Lynch, H. G. Sander, H. Krehbiel, W. Braunschweig, G. Grindhammer, E. Gadermann, D. Kreinick, W. Wallraff, R. Brandelik, Horst Oberlack, H. U. Martyn, R. Fries, J. Ludwig, K. C. Moffeit, G. Buschhorn, D. Notz, W. Sturm, R. Rüsch, Shinya Yamada, U. Kötz, S. Orito, H. Hultschig, R. Felst, P. Schmüser, W. Fues, K. Sauerberg, D. Cords, M. Schliwa, B. H. Wilk, and Gy. Wolf

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Photon, Annihilation, Electron–positron annihilation, High Energy Physics::Experiment, Multiplicity (mathematics), Electron, Weak current, High multiplicity, Multiplicity distribution
Abstract

The multiplicity distribution of inclusive electron events above 4 GeV cm energy shows two distinct classes of events: two prong no photon and high multiplicity events. If the high multiplicity events are attributed to the semi-leptonic decay of charmed particles the two prong no photon events must come from the weak decay of a different type of particle. The charged K to π ratio was measured for these events. The average number of charged kaons is 0.07 ± 0.06 per two prong event and 0.90 ± 0.18 per multiprong event. Thus the weak current responsible for the low multiplicity events has a small coupling to strange particles.

Published
1977
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15. A measurement of collinear and nearly collinear photon pairs produced by e+e− annihilation at the 3100 MeV resonance

Author

Y. Totsuka, B. H. Wiik, M. Schliwa, S. Orita, R. Felst, W. Braunschweig, R. Kotthaus, D. Kreinick, W. Wallraff, Horst Oberlack, Teruhiro Suda, G. Vogel, D.W. Schmitz, C.L. Jordan, K. H. Mess, U. Kötz, U. Martyn, P. Joos, H. Hultsching, D. Notz, W. Koch, E. Gadermann, K. P. Pretzl, G. Poelz, J. Ludwig, H. G. Sander, Shinya Yamada, Gy. Wolf, H. Krehbiel, G. Grindhammer, K. Berkelman, G. Buschhorn, W. Sturm, H. Lierl, U. Kruse, P. Schmüser, K. Sauerberg, D. Cords, and K. C. Moffeit

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Cross section (physics), Angular distribution, Photon, Annihilation, Atomic physics, Resonance (particle physics)
Abstract

We have measured collinear and nearly collinear photon pairs from e+e− annihilation at total energies covering the resonance at 3100 MeV. The observed cross section is in good agreement with the e+e− → γγ cross section expected from quantum electrodynamics. Upper limits for the decay modes (3100) → γγ, πOγ and other modes are derived.

Published
1975
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16. Electroproduction of neutral pions at energies above the resonance region

Author

F.W. Brasse, R. Haidan, J. May, J. Gayler, P. Schmüser, J. Ludwig, U. Kötz, K. H. Mess, D. Kreinick, B. H. Wiik, V. Korbel, W. Fehrenbach, S.P. Goel, M. Merkwitz, and W. Flauger

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Spectrometer, Electron, Resonance (particle physics), Nuclear physics, Lead glass, Pion, Hodoscope, visual_art, visual_art.visual_art_medium, Electron scattering
Abstract

The reaction e p→e'p π 0 has been measured at W =2.55 GeV a fixed electron scattering angle of 10.3°. Two magnetic spectrometers and a lead glass hodoscope were used to detect all four final state particles. Electroproduction cross sections in the t range −0.15 to −1.4 (GeV/ c ) 2 at q 2 = −0.22, −0.55 and −0.85 (GeV/ c ) 2 are presented. Above | t |=0.6 (GeV/ c ) 2 the cross sections are considerably smaller than those for photoproduction.

Published
1975
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17. Production characteristics of the F meson

Author

J. Ringel, J. Ludwig, H. U. Martyn, Teruhiro Suda, Ch. Von Gagern, D. Cords, D. Kreinick, G. Buschhorn, Y. Totsuka, W. Sturm, H. L. Lynch, G. Grindhammer, Guenter Wolf, W. Koch, R. Kotthaus, W. De Boer, W. Braunschweig, D. Notz, G. Poelz, R. Rüsch, H. Lierl, R. Fries, U. Kötz, A. Shapira, D.W. Schmitz, H. Krehbiel, P. Joos, P. Schmüser, W. Fues, K. Sauerberg, H. G. Sander, B. Gunderson, E. Gadermann, S. Orito, G. Mikenberg, M. Schliwa, R. Brandelik, W. A. McNeely, H. Hultschig, B. H. Wiik, R. Felst, W. Wallraff, Horst Oberlack, Shinya Yamada, O. Römer, K. H. Mess, A. Petersen, and K.C. Moffeit

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Low energy, Photon, Annihilation, Meson, Electron–positron annihilation, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, Resonance (particle physics)
Abstract

Inclusive cross sections of η production by e+e- annihilation for c.m. energies between 4.0 and 5.0 GeV are presented. The η production is shown to be correlated with the production of a weakly decaying particle, indicating that its main source is F production. At the 4.42 GeV resonance it is correlated with a low energy photon, suggesting FF∗ or F∗F∗ production. A mass determination of the F is made at 4.42 GeV using the F → ηπ decay channel.

Published
1979
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18. Evidence for weakly decaying new hadrons in e+e− collisions above 4 GeV cms

Author

E. Gadermann, Shinya Yamada, O. Römer, W. Wallraff, W. Koch, D. Cords, W. A. McNeely, Horst Oberlack, R. Kotthaus, G. Poelz, D. Kreinick, P. Petersen, Teruhiro Suda, P. Schmüser, J. Ringel, M. Schliwa, P. Joos, D.W. Schmitz, K. Sauerberg, R. Rüsch, Y. Totsuka, S. Orito, W. Braunschweig, R. Fries, H. G. Sander, K. C. Moffeit, J. Ludwig, H. Hultschig, B. H. Wiik, H. Krehbiel, R. Felst, K. H. Mess, U. Kötz, Gy. Wolf, H. U. Martyn, B. Gittelman, G. Buschhorn, W. Sturm, B. Gunderson, W. De Boer, G. Grindhammer, and H. Lierl

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Spectrometer, Electron–positron annihilation, Hadron, Electron, Quantum number, Nuclear physics, Electromagnetic interaction, Electron yield, High Energy Physics::Experiment, Multiplicity (chemistry), Nuclear Experiment
Abstract

Single electrons produced with hadrons in e + e − collisions at cms energies of 4.0 to 4.2 GeV have been observed at DORIS using the double arm spectrometer DASP. The measured electron spectrum peaks at low momentum and the associated hadron multiplicity is high. These experimental results are consistent with the electromagnetic production and weak decay of a hadron with a new quantum number that is conserved by the strong and electromagnetic interaction. The electron yield at 3.7 GeV (the ψ′ resonance) and at lower energies was found to be consistent with the estimated background, indicating that the production threshold lies between 3.7 and 4.0 GeV.

Published
1976
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19. Inclusive hadron production by e+e− annihilation for s between 13 and 25 GeV2

Author

W. Wallraff, Horst Oberlack, B. Gunderson, W. Braunschweig, J. Ringel, H. U. Martyn, Shinya Yamada, P. Joos, J. Ludwig, H. Krehbiel, A. Petersen, R. Rüsch, G. Buschhorn, W. Sturm, H. Hultschig, D. Kreinick, W. A. McNeely, B. H. Wiik, R. Brandelik, R. Felst, D. Cords, W. De Boer, R. Kotthaus, O. Römer, G. Grindhammer, K. H. Mess, Teruhiro Suda, U. Kötz, S. Orito, H. Lierl, Y. Totsuka, P. Schmüser, K. Sauerberg, D.W. Schmitz, R. Fries, H. G. Sander, E. Gadermann, W. Koch, G. Poelz, M. Schliwa, K. C. Moffeöt, and Gy. Wolf

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Electron–positron annihilation, Hadron
Abstract

Charged hadron production via e + e − → h ± X where h ± = π ± , K ± , p has been measured for s values between 13 and 25 GeV2. Inclusive cross sections and the evidence for scaling are presented.

Published
1977
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20. Results from DASP one + e ? annihilation between 3.1 and 5.2 GeV

Author

J. Ringel, W. Koch, G. Poelz, Y. Totsuka, H. U. Martyn, G. Grindhammer, U. Kötz, Ch. Von Gagern, E. Gadermann, Takafumi Suda, R. Brandelik, G. Mikenberg, W. de Boer, K. H. Mess, R. Kotthaus, A. Petersen, D.W. Schmitz, S. Orito, Gy. Wolf, P. Schmüser, W. Fues, P. Joos, K. Sauerberg, M. Schliwa, W. Wallraff, W. A. McNeely, R. Fries, H. L. Lynch, A. Shapira, D. Kreinick, J. Ludwig, H. Krehbiel, K. C. Moffeit, O. Romer, R. Rüsch, D. Notz, H. Hultschig, Horst Oberlack, B. H. Wiik, D. Cords, R. Felst, H. G. Sander, W. Braunschweig, S. Yamada, H. Lierl, G. Buschhorn, W. Sturm, and B. Gunderson

Subjects
Physics, Particle physics, Range (particle radiation), Annihilation, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, High Energy Physics::Phenomenology, Elementary particle, Nuclear physics, Radiative transfer, High Energy Physics::Experiment, Quantum field theory, Nuclear Experiment, Engineering (miscellaneous), Lepton
Abstract

This paper summarizes the measurements one+e− annihilation performed by the DASP Collaboration in the energy range between 3.1 and 5.2 GeV. The following topics are covered: total cross section, production and two body decays of the narrow resonances, radiative decays of theJ/ψ and ψ′ resonances and evidence for theX(2.82), ψ′ cascade decays, inclusive η production and evidence for theF meson, semileptonic decays of charmed mesons and properties of the heavy lepton.

Published
1979
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21. sdependence of proton fragmentation by hadrons. I. Incident laboratory momenta 4-24 GeV/c

Author

D. Kreinick, E. W. Beier, H. Weisberg, G. Featherston, R. Patton, K. Raychaudhuri, H. Takeda, R. Van Berg, H. Brody, and R. Thern

Subjects
Baryon, Nuclear physics, Physics, Particle physics, Pion, Meson, Proton, Hadron, Elementary particle, Fermion, Nucleon
Abstract

Measurements of the dependence on $s={({p}_{a}+{p}_{b})}^{2}$ of the cross sections for production of single charged hadrons in the reactions $a+b\ensuremath{\rightarrow}c+\mathrm{anything}$ are presented. Particle $c$ was detected in a fixed interval of laboratory momentum and angle in the fragmentation region of the target proton. The ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ and ${K}^{+}$ production data are consistent with the Mueller-Regge prediction of an approach to scaling as $A+B{s}^{\ensuremath{-}\frac{1}{2}}$. Further tests of a simple Regge-pole model indicate that the $s$ dependence measured is fortuitous, and that higher-energy data are required in order to make detailed tests of the model.

Published
1978
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22. Total cross section for hadron production by e+e−-annihilation at center of mass energies between 3.6 and 5.2 GeV

Author

P. Schmüser, D. Kreinick, W. Fues, J. Ringel, K. Sauerberg, R. Kotthaus, W. Koch, G. Poelz, G. Grindhammer, E. Gadermann, U. Kötz, D. Notz, H. G. Sander, D. Cords, J. Ludwig, B. Gunderson, Shinya Yamada, Ch. Von Gagern, Gy. Wolf, R. Fries, R. Rüsch, H. Hultschig, G. Mikenberg, B. H. Wiik, A. Shapira, K. H. Mess, K. C. Moffeit, R. Brandelik, G. Buschhorn, H. U. Martyn, R. Felst, W. Sturm, Teruhiro Suda, Y. Totsuka, M. Schliwa, W. Wallraff, D.W. Schmitz, H. L. Lynch, Horst Oberlack, W. De Boer, W. Braunschweig, H. Lierl, O. Römer, H. Krehbiel, A. Petersen, W. A. McNeely, P. Joos, and S. Orito

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, Annihilation, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, Hadron, Charged particle, Nuclear physics, Cross section (physics), High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Center of mass, Nuclear Experiment, Astrophysics::Galaxy Astrophysics
Abstract

The total cross section for e + e − annihilation into hadronic final states between 3.6 and 5.2 GeV was measured by the nonmagnetic inner detector of DASP, which has similar trigger and detection efficiencies for photons and charged particles. The measured difference in R = σ had / σμμ between 3.6 GeV and 5.2 GeV is ΔR = 2.1 ± 0.3. We observe three peaks at cm energies of 4.04, 4.16 and 4.417 GeV, the parameters of which, when interpreted as resonances, are given.

Published
1978
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23. Muon pair production by e+e− annihilation at the 3100 MeV resonance

Author

U. Kruse, U. Martyn, U. Kötz, J. Ludwig, G. Grindhammer, D.W. Schmitz, R. Kotthaus, H. G. Sander, E. Königs, W. Wallraff, G. Buschhorn, Teruhiro Suda, W. Koch, Horst Oberlack, Y. Totsuka, W. Sturm, P. Joos, G. Poelz, C.L. Jordan, K. Berkelman, M. Schliwa, E. Gadermann, D. Kreinick, W. Braunschweig, H. Lierl, D. Notz, K. P. Pretzl, Shinya Yamada, S. Orito, H. Krehbiel, K. H. Mess, P. Schmüser, K. Sauerberg, D. Cords, K. C. Moffeit, G. Vogel, H. Hultschig, B. H. Wiik, R. Felst, and Gy. Wolf

Subjects
Physics, Nuclear and High Energy Physics, Annihilation, Muon, media_common.quotation_subject, Asymmetry, Resonance (particle physics), Nuclear physics, Cross section (physics), Pair production, Angular distribution, High Energy Physics::Experiment, Total energy, Atomic physics, Nuclear Experiment, media_common
Abstract

We report results for μ pair production in e+e− collisions at the 3100 MeV resonance. We find a resonance cross section, integrated over total energy of 1240 ± 140 nb-MeV implying Γ μμΓee/Γtot = 0.51 ± 0.09 KeV. The angular distribution is consistent with ∼(1 + cos2θ). No forward-backward asymmetry is observed.

Published
1975
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24. Observation of the two photon cascade 3.7 → 3.1 + γγ via an intermediate state Pc

Author

J. Ringel, Y. Totsuka, J. Ludwig, Shinya Yamada, E. Gadermann, H. Krehbiel, D.W. Schmitz, K. P. Pretzl, A. Petersen, P. Joos, K. Sauerberg, D. Kreinick, S. Orito, H. Lierl, P. Schmu¨ser, D. Cords, H. G. Sander, K. C. Moffeit, K. Berkelman, Teruhiro Suda, W. Wallraff, U. Ko¨tz, G. Grindhammer, W. Koch, H. U. Martyn, Horst Oberlack, G. Buschhorn, G. Vogel, G. Poelz, W. Braunschweig, W. Sturm, H. Hultschig, R. Kotthaus, B. H. Wiik, R. Felst, DASP-Collaboration, U. Kruse, M. Schliwa, K. H. Mess, and Gy. Wolf

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Photon, Two-photon excitation microscopy, Cascade, Electron–positron annihilation, Resonance, Intermediate state, High Energy Physics::Experiment, Charge (physics), Nuclear Experiment
Abstract

The two photon cascade decay of the 3.7 GeV resonance into the 3.1 GeV resonance has been observed in two nearly independent experiments. The clustering of the photon energies around 160 MeV and 420 MeV observed in the channel 3.7 → (3.1 → μ + μ − ) + γγ indicates the existence of at least one intermediate state with even charge conjugation at a mass around 3.52 GeV or 3.26 GeV.

Published
1975
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25. Evidence for the F meson

Author

W. De Boer, H. Hultschig, K. C. Moffeit, B. H. Wiik, M. Schliwa, G. Grindhammer, P. Schmüser, W. Fues, K. Sauerberg, R. Felst, R. Brandelik, D. Cords, O. Römer, D.W. Schmitz, W. Koch, H. Lierl, D. Kreinick, Gy. Wolf, Teruhiro Suda, H. U. Martyn, Y. Totsuka, A. Petersen, G. Buschhorn, H. L. Lynch, W. A. McNeely, G. Poelz, K. H. Mess, Ch. Von Gagern, S. Orito, W. Sturm, J. Ringel, H. Krehbiel, U. Kötz, W. Braunschweig, J. Ludwig, B. Gunderson, E. Gadermann, D. Notz, G. Mikenberg, R. Rüsch, H. G. Sander, R. Kotthaus, Shinya Yamada, R. Fries, A. Shapira, P. Joos, W. Wallraff, and Horst Oberlack

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Photon, Low energy, Annihilation, Meson, Electron–positron annihilation
Abstract

Inclusive η production by e+e− annihilation for cm energies between 4 and 5.2 GeV was studied. A strong η signal was observed at 4.4 GeV, produced predominantly in conjunction with a low energy photon suggestive of F F ∗ or F∗ F ∗ production. From events containing a π±, and η, and a low energy photon the F and F∗ masses were found to be 2.03 ± 0.06 and 2.14 ± 0.06 GeV, respectively.

Published
1977
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26. High-Energy Photomeson Production from Hydrogen Via the 'uChannel'

Author

J. Johnson, W. G. Jones, D. Kreinick, R. L. Anderson, D. Gustavson, Roy Weinstein, and D. M. Ritson

Subjects
Physics, Elastic scattering, Hydrogen, Meson, Center (category theory), General Physics and Astronomy, chemistry.chemical_element, Lambda, Pion, chemistry, High Energy Physics::Experiment, Production (computer science), Atomic physics, Nucleon
Abstract

We have investigated the photoproduction process $\ensuremath{\gamma}+p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}+n$ over a wide range of energies and $u$ values at the Stanford Linear Accelerator Center (SLAC) accelerator. We also have investigated $\ensuremath{\gamma}+p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}+{N}^{*++}$ at one value of $u$ and $\ensuremath{\gamma}+p\ensuremath{\rightarrow}{K}^{+}+{\ensuremath{\Lambda}}^{0}$, ${\ensuremath{\Sigma}}^{0}$ at one $u$ value and three energies. Our results for $\frac{d\ensuremath{\sigma}}{\mathrm{du}}$ for the photoproduction of ${\ensuremath{\pi}}^{+}$ mesons from hydrogen are roughly $\frac{\ensuremath{\alpha}}{2\ensuremath{\pi}}$ of the corresponding cross sections for the elastic scattering of ${\ensuremath{\pi}}^{\ensuremath{-}}$ mesons from hydrogen. The $u$ dependence of our cross sections is not dominated by nucleon exchange as it is in the case of ${\ensuremath{\pi}}^{+}p$ elastic scattering.

Published
1968
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27. Neutral-Boson Photoproduction on Hydrogen at High Energies

Author

R. L. Anderson, B. H. Wiik, W. G. Jones, D. Kreinick, F. V. Murphy, D. M. Ritson, D. Gustavson, Roy Weinstein, and J.R. Johnson

Subjects
Quark, Nuclear physics, Physics, Pion, Photon, Hydrogen, chemistry, Quantum electrodynamics, chemistry.chemical_element, Elementary particle, Field theory (psychology), Boson
Published
1970
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28. Forward Photoproduction of Vector Mesons from Hydrogen at Energies from 6.5 to 17.8 gev

Author

D. Gustavson, D. Kreinick, F. V. Murphy, D. M. Ritson, Roy Weinstein, J. Johnson, R. L. Anderson, M. W. Gettner, and W. G. Jones

Subjects
Physics, Particle physics, Photon, Meson, Hydrogen, chemistry, General Physics and Astronomy, chemistry.chemical_element, Production (computer science), Atomic physics, Resonance (particle physics), Square (algebra)
Abstract

We report measurements of the differential cross sections of ${\ensuremath{\rho}}^{0}$- and $\ensuremath{\phi}$-meson photo-production on hydrogen for a range of the square of the four-momentum transfer $t$ from -0.2 to -0.9 ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$ and a range of incident photon energies from 6.5 to 17.8 GeV. We find that differential cross sections obtained for ${\ensuremath{\rho}}^{0}$ production are in good agreement with the vector-dominance model.

Published
1968
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