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Start Over Author "Gunderson, B." Topic annihilation [electron positron]
11 results on '"Gunderson, B."'

1. Production of charged kaons by $e^+ e^-$ collisions between $\sqrt s$ = 3.6 and 5-GeV

Author

Brandelik, R., Braunschweig, W., Gadermann, E., Hultschig, H., Joos, P., Koch, W., Kotz, U., Krehbiel, H., Kreinick, D., McNeely, W. A., Moffeit, K. C., Romer, O., Martyn, H.-U., Rusch, R., Wiik, B. H., Wolf, G., Grindhammer, Guenter, Ludwig, J., Mess, K. H., Petersen, A., Poelz, G., Ringel, J., Sauerberg, K., Sander, H. G., Schmueser, Peter, de Boer, W., Buschhorn, G., Gunderson, B., Kotthaus, R., Lierl, H., Oberlack, H., Schliwa, M., Orito, S., Suda, T., Schmitz, D., Totsuka, Y., Yamada, S., DASP Collaboration, Strum, W., Wallraff, W., Cords, D., Felst, R., and Fries, R.

Subjects
INCLUSIVE REACTION [TOTAL CROSS SECTION], TOTAL CROSS SECTION [INCLUSIVE REACTION], INCLUSIVE REACTION: DIFFERENTIAL CROSS SECTION, +K%2B+ANYTHING%22">ELECTRON POSITRON --> K+ ANYTHING, K-: FINAL STATE, K+: FINAL STATE, FINAL STATE [K-], TOTAL CROSS SECTION: ENERGY DEPENDENCE, K- [FINAL STATE], ENERGY DEPENDENCE [TOTAL CROSS SECTION], ENERGY DEPENDENCE: YIELD, +K-+ANYTHING%22">ELECTRON POSITRON --> K- ANYTHING, ELECTRON POSITRON: INCLUSIVE REACTION, COLLIDING BEAMS [ELECTRON POSITRON], DIFFERENTIAL CROSS SECTION [INCLUSIVE REACTION], K- [ELECTROPRODUCTION], ANNIHILATION: ELECTRON POSITRON, ELECTRON POSITRON: COLLIDING BEAMS, ELECTROPRODUCTION [K-], RATIO [TOTAL CROSS SECTION], K-: ELECTROPRODUCTION, ELECTROPRODUCTION: K, ELECTRON POSITRON [ANNIHILATION], ANNIHILATION [ELECTRON POSITRON], K+: ELECTROPRODUCTION, ELECTROPRODUCTION: K+, 3.6-5.0 GEV-CMS, MAGNETIC SPECTROMETER: DASP, INCLUSIVE REACTION: TOTAL CROSS SECTION, YIELD [ENERGY DEPENDENCE], INCLUSIVE REACTION [DIFFERENTIAL CROSS SECTION], K: YIELD, DIFFERENTIAL CROSS SECTION: INCLUSIVE REACTION, ddc:530, FINAL STATE [K+], TOTAL CROSS SECTION: RATIO, COLLIDING BEAMS: ELECTRON POSITRON, EXPERIMENTAL RESULTS, K+ [ELECTROPRODUCTION], K+ [FINAL STATE], TOTAL CROSS SECTION: INCLUSIVE REACTION, DESY DORIS STOR, DASP [MAGNETIC SPECTROMETER], FINAL STATE: K+, FINAL STATE: K, ELECTRON POSITRON [COLLIDING BEAMS], INCLUSIVE REACTION [ELECTRON POSITRON], ELECTROPRODUCTION [K+], YIELD [K], ELECTRON POSITRON: ANNIHILATION
Abstract

(1977). doi:10.1016/0370-2693(77)90394-X, 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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2. On the semileptonic decay of charmed hadrons

Author

Brandelik, R., Braunschweig, W., Gadermann, E., Hultschig, H., Joos, P., Koch, W., Kotz, U., Krehbiel, H., Kreinick, D., Lynch, H. L., McNeely, W. A., Mikenberg, G., Martyn, H.-U., Moffeit, K. C., Notz, D., Rusch, R., Schliwa, M., Wiik, B. H., Wolf, G., Grindhammer, Guenter, Ludwig, J., Mess, K. H., Petersen, A., Sander, H. G., Poelz, G., Ringel, J., Romer, O., Sauerberg, K., Schmueser, Peter, de Boer, W., Buschhorn, G., Fues, W., von Gagern, C., Gunderson, B., Schmitz, D., Kotthaus, R., Lierl, H., Oberlack, H., Orito, S., Suda, T., Totsuka, Y., Yamada, S., DASP Collaboration, Sturm, W., Wallraff, W., Cords, D., Felst, R., and Fries, R.

Subjects
K: FINAL STATE, +%28N%29HADRON+3ELECTRON%22">ELECTRON POSITRON --> (N)HADRON 3ELECTRON, ELECTRON [FINAL STATE], HADRON [FINAL STATE], CHARMED HADRON: SEMILEPTONIC DECAY, CHARMED HADRON: LEPTONIC DECAY, FINAL STATE [ANTINEUTRINO/E/], ANTINEUTRINO/E/ [FINAL STATE], CHARMED HADRON [LEPTONIC DECAY], Nuclear Experiment, FINAL STATE [HADRON], +K+ELECTRON+ANTINEUTRINO%2FE%22">D --> K ELECTRON ANTINEUTRINO/E, +K*%28892%29+ELECTRON+ANTINEUTRINO%2FE%22">D --> K*(892) ELECTRON ANTINEUTRINO/E, K [FINAL STATE], FINAL STATE [ELECTRON], COLLIDING BEAMS [ELECTRON POSITRON], SEMILEPTONIC DECAY [CHARMED HADRON], ANNIHILATION: ELECTRON POSITRON, LEPTONIC DECAY: CHARMED HADRON, FINAL STATE: ELECTRON, ELECTRON POSITRON: COLLIDING BEAMS, D: SEMILEPTONIC DECAY, ELECTRON POSITRON [ANNIHILATION], SEMILEPTONIC DECAY: BRANCHING RATIO, +2CHARGED+PARTICLE+ELECTRON+ANYTHING%22">ELECTRON POSITRON --> 2CHARGED PARTICLE ELECTRON ANYTHING, ANNIHILATION [ELECTRON POSITRON], BRANCHING RATIO [SEMILEPTONIC DECAY], HADRON: FINAL STATE, FINAL STATE: HADRON, FINAL STATE: K, 4.0-5.2 GEV-CMS, FINAL STATE: ANTINEUTRINO/E, SEMILEPTONIC DECAY [D], ANTINEUTRINO/E/: FINAL STATE, DASP [MAGNETIC DETECTOR], ddc:530, COLLIDING BEAMS: ELECTRON POSITRON, EXPERIMENTAL RESULTS, ELECTRON: FINAL STATE, DESY DORIS STOR, High Energy Physics::Phenomenology, K*(892), LEPTONIC DECAY [CHARMED HADRON], FINAL STATE [K], ELECTRON POSITRON [COLLIDING BEAMS], High Energy Physics::Experiment, MAGNETIC DETECTOR: DASP, ELECTRON POSITRON: ANNIHILATION
Abstract

(1977). doi:10.1016/0370-2693(77)90684-0, 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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3. Measurements of $\tau$ decay modes and a precise determination of the mass

Author

Braunschweig, W., Martyn, H.-U., Hultschig, H., Joos, P., Koch, W., Kotz, U., Krehbiel, H., Kreinick, D., Lynch, H. L., McNeely, W. A., Mikenberg, G., Moffeit, K. C., Sander, H. G., Notz, Dieter, Rusch, R., Schliwa, M., Wiik, B. H., Wolf, G., Grindhammer, Guenter, Ludwig, J., Mess, K. H., Petersen, A., Poelz, G., Schmitz, D., Ringel, J., Romer, O., Sauerberg, K., Brandelik, R., Schmueser, Peter, de Boer, W., Buschhorn, G., Fues, W., von Gagern, C., Gunderson, B., Sturm, W., Kotthaus, R., Lierl, H., Oberlack, H., Orito, S., Suda, T., Totsuka, Y., Yamada, S., DASP Collaboration, Wallraff, W., Cords, D., Felst, R., Fries, R., and Gadermann, E.

Subjects
+CHARGED+HADRON+NEUTRINO%2FTAU%2F+%28N%29PHOTON%22">TAU --> CHARGED HADRON NEUTRINO/TAU/ (N)PHOTON, ELECTRON [FINAL STATE], FINAL STATE: MUON, ELECTRON MUON: UNIVERSALITY, +MUON+NEUTRINO%2FTAU%2F+ANTINEUTRINO%2FMU%22">TAU --> MUON NEUTRINO/TAU/ ANTINEUTRINO/MU, TAU [ELECTROPRODUCTION], DIFFERENTIAL CROSS SECTION: ENERGY DEPENDENCE, FINAL STATE [PHOTON], FINAL STATE [ANTINEUTRINO/E/], FINAL STATE [MUON], FINAL STATE: NEUTRINO/TAU, ANTINEUTRINO/E/ [FINAL STATE], MUON [FINAL STATE], TAU: PAIR PRODUCTION, TAU: BRANCHING RATIO, TAU: MASS, MUON: FINAL STATE, FINAL STATE [ELECTRON], WEAK INTERACTION: CURRENT, ELECTRON POSITRON: INCLUSIVE REACTION, PAIR PRODUCTION: TAU, COLLIDING BEAMS [ELECTRON POSITRON], ANNIHILATION: ELECTRON POSITRON, PAIR PRODUCTION [TAU], NEUTRINO/TAU/ [FINAL STATE], FINAL STATE: ELECTRON, +ELECTRON+NEUTRINO%2FTAU%2F+ANTINEUTRINO%2FE%22">TAU --> ELECTRON NEUTRINO/TAU/ ANTINEUTRINO/E, ELECTRON POSITRON: COLLIDING BEAMS, ELECTRON POSITRON [ANNIHILATION], ANNIHILATION [ELECTRON POSITRON], FINAL STATE [NEUTRINO/TAU/], 3.1-5.2 GEV-CM, BRANCHING RATIO [TAU], MAGNETIC SPECTROMETER: DASP, +%28N%29CHARGED+HADRON+NEUTRINO%2FTAU%2F+%28N%29PHOTON%22">TAU --> (N)CHARGED HADRON NEUTRINO/TAU/ (N)PHOTON, ANTINEUTRINO/MU/: FINAL STATE, FINAL STATE [ANTINEUTRINO/MU/], PHOTON [FINAL STATE], TAU: ELECTROPRODUCTION, FINAL STATE: ANTINEUTRINO/E, TAU [PAIR PRODUCTION], MASS [TAU], PHOTON: FINAL STATE, NEUTRINO/TAU/: FINAL STATE, ANTINEUTRINO/MU/ [FINAL STATE], ANTINEUTRINO/E/: FINAL STATE, ELECTROPRODUCTION: TAU, ddc:530, TAU [DECAY MODES], FINAL STATE: ANTINEUTRINO/MU, COLLIDING BEAMS: ELECTRON POSITRON, ELECTROPRODUCTION [TAU], EXPERIMENTAL RESULTS, ELECTRON: FINAL STATE, FINAL STATE: PHOTON, DESY DORIS STOR, DASP [MAGNETIC SPECTROMETER], TAU [MASS], UNIVERSALITY [ELECTRON MUON], CURRENT [WEAK INTERACTION], DECAY MODES [TAU], ELECTRON POSITRON [COLLIDING BEAMS], INCLUSIVE REACTION [ELECTRON POSITRON], ENERGY DEPENDENCE [DIFFERENTIAL CROSS SECTION], MASS: TAU, DECAY MODES: TAU, TAU: DECAY MODES, ELECTRON POSITRON: ANNIHILATION
Abstract

(1978). doi:10.1016/0370-2693(78)90183-1, 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 B μ / B e = 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 → ν τ + charged hadron + any photons) = 0.29 ± 0.11, B ( τ → ν τ + three or more charged hadrons + any photons) = 0.35 ± 0.11.

Published
1977
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4. Search for Light Leptoquark Bosons

Author

Behrend, H. J., Burger, J., Sindt, H., Timm, U., Winter, G. G., Zimmermann, W., Bussey, P. J., Buttar, C., Campbell, A. J., Dainton, J. B., Hendry, D., McCurrach, G., Criegee, L., Scarr, J. M., Skillicorn, I. O., Smith, K. M., Blobel, V., Feindt, M., Poppe, M., Spitzer, H., Apel, W. D., Boehrer, Armin, Engler, J., Fenner, H., Flugge, G., Fries, D. C., Fues, W., Gamerdinger, K., Grosse-Wiesmann, P., Hansmeyer, J., Henkes, T., Hopp, G., Jung, H., Knapp, J., Field, J. H., Kruger, M., Kuster, H., Mayer, P., Muller, H., Ranitzsch, K. H., Schneider, H., Wolf, J., de Boer, W., Buschhorn, G., Christiansen, W., Franke, G., Grindhammer, Guenter, Gunderson, B., Kiesling, Christian M., Kotthaus, R., Kroha, H., Luers, D., Oberlack, H., Sack, B., Schacht, P., Shooshtari, G., Fuster, J., Wiedenmann, W., Cordier, A., Davier, M., Fournier, D., Gaillard, M., Grivaz, J. F., Haissinski, J., Journe, V., Le Diberder, F., Ros, E., Holler, Y., Spadafora, A., Veillet, J. J., Fatah, B., George, R., Goldberg, M., Hamon, O., Kapusta, Frederic, Kovacs, F., Poggioli, L., Rivoal, M., Meyer, J., D'Agostini, G., Ferrarotto, F., Gaspero, Mario, Stella, B., Aleksan, R., Cozzika, G., Ducros, Y., Lavagne, Y., Ould Saada, F., Pamela, J., Schroder, V., Pierre, F., Zacek, J., Alexander, G., Bella, G., Gnat, Y., Grunhaus, J., Levy, A., and CELLO Collaboration

Subjects
LEPTOQUARK: PAIR PRODUCTION, DESY PETRA STOR, GOLDSTONE PARTICLE [POSTULATED PARTICLE], POSTULATED PARTICLE: LEPTOQUARK, LEPTOQUARK [SEMILEPTONIC DECAY], S056EGT, POSTULATED PARTICLE: GOLDSTONE PARTICLE, PAIR PRODUCTION: LEPTOQUARK, +%28N%29HADRON+MUON+MISSING-ENERGY%22">ELECTRON POSITRON --> (N)HADRON MUON MISSING-ENERGY, ddc:530, COLLIDING BEAMS: ELECTRON POSITRON, EXPERIMENTAL RESULTS, SEMILEPTONIC DECAY: LEPTOQUARK, +%28N%29HADRON+MISSING-ENERGY%22">ELECTRON POSITRON --> (N)HADRON MISSING-ENERGY, PAIR PRODUCTION [LEPTOQUARK], 43 GEV-CMS, COLLIDING BEAMS [ELECTRON POSITRON], LEPTOQUARK [PAIR PRODUCTION], SEMILEPTONIC DECAY [LEPTOQUARK], ANNIHILATION: ELECTRON POSITRON, ELECTRON POSITRON [COLLIDING BEAMS], LEPTOQUARK: SEMILEPTONIC DECAY, ELECTRON POSITRON: COLLIDING BEAMS, ELECTRON POSITRON [ANNIHILATION], ANNIHILATION [ELECTRON POSITRON], +%28N%29HADRON+2MUON%22">ELECTRON POSITRON --> (N)HADRON 2MUON, CELLO, LEPTOQUARK [POSTULATED PARTICLE], ELECTRON POSITRON: ANNIHILATION
Abstract

5 pp. (1987)., A search for light leptoquarks decaying into a lepton and a quark has been performed using the CELLO detector at the storage ring PETRA. Decay modes have been looked for where the lepton is either a muon or a neutrino, the latter being detected by a high missing transverse momentum. Except for one event previously reported no further two-jet events with two isolated muons were observed. No evidence for pair production of these particles has been found in other final states configurations. Our results are interpreted within a model where leptoquarks appear as a coloured Goldsone multiplet of charges 2/3.A 95% CL upper limit of 0.30 pb is set on the pair production cross section of such leptoquarks, thus excluding masses between 7 and 20.5 GeV.

Published
1987
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5. The three photon final state produced in $e^+ e^-$ collision at 3.6-GeV and at the $\psi'$

Author

Braunschweig, W., Martyn, H.-U., Gadermann, E., Hultschig, H., Joos, P., Koch, W., Kotz, U., Krehbiel, H., Kreinick, D., McNeely, W. A., Moffeit, K. C., Petersen, A., Sander, H. G., Rusch, R., Schliwa, M., Grindhammer, Guenter, Ludwig, J., Mess, K. H., Poelz, G., Ringel, J., Sauerberg, K., Schmueser, Peter, de Boer, W., Schmitz, D., Buschhorn, G., Gunderson, B., Kotthaus, R., Lierl, H., Oberlack, H., Pretzl, K., Orito, S., Suda, T., Totsuka, Y., Yamada, S., Sturm, W., DASP Collaboration, Wallraff, W., Berkelman, Karl, Cords, D., Felst, R., and Fries, R.

Subjects
PHOTON [FINAL STATE], QUANTUM ELECTRODYNAMICS, 3.7 GEV-CMS [3.6], FINAL STATE [PHOTON], BOUNDARY CONDITION [TOTAL CROSS SECTION], (3PHOTON) [FINAL STATE], EXPERIMENTAL RESULTS [DESY DORIS STOR], BRANCHING RATIO [PSI(3700)], ELECTROPRODUCTION [ETA(549)], +X%282830%29+PHOTON%22">PSI(3700) --> X(2830) PHOTON, ETA(549) [ELECTROPRODUCTION], WIDTH [RADIATIVE DECAY], DESY DORIS STOR [EXPERIMENTAL RESULTS], ELECTROPRODUCTION [X(2830)], DASP [MAGNETIC DETECTOR], ddc:530, +X%282830%29+PHOTON%22">ELECTRON POSITRON --> X(2830) PHOTON, COLLIDING BEAMS [ELECTRON POSITRON], +ETA%28549%29+PHOTON%22">ELECTRON POSITRON --> ETA(549) PHOTON, ELECTRON POSITRON [COLLIDING BEAMS], RADIATIVE DECAY [PSI(3700)], RADIATIVE DECAY [WIDTH], ELECTRON POSITRON [ANNIHILATION], ELECTROPRODUCTION [PSI(3700)], BOUNDARY CONDITION [WIDTH], ANNIHILATION [ELECTRON POSITRON], PSI(3700) [ELECTROPRODUCTION], X(2830) [ELECTROPRODUCTION]
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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6. Inclusive hadron production by $\mathrm{e^+ e^-}$ annihilation for s between 13 and 25 $\mathrm{GeV^2}$

Author

Brandelik, R., Braunschweig, W., Gadermann, E., Hultschig, H., Joos, P., Koch, W., Kotz, U., Krehbiel, H., Kreinick, D., McNeely, W. A., Moffeit, K. C., Romer, O., Martyn, H.-U., Rusch, R., Wiik, B. H., Wolf, G., Grindhammer, Guenter, Ludwig, J., Mess, K. H., Petersen, A., Poelz, G., Ringel, J., Sauerberg, K., Sander, H. G., Schmueser, Peter, de Boer, W., Buschhorn, G., Gunderson, B., Kottkaus, R., Lierl, H., Oberlack, H., Schliwa, M., Orito, S., Suda, T., Schmitz, D., Totsuka, Y., Yamada, S., DASP Collaboration, Strum, W., Wallraff, W., Cords, D., Felst, R., and Fries, R.

Subjects
HADRON [ELECTROPRODUCTION], DESY DORIS STOR, INCLUSIVE REACTION [DIFFERENTIAL CROSS SECTION], DASP [MAGNETIC SPECTROMETER], +CHARGED+HADRON+ANYTHING%22">ELECTRON POSITRON --> CHARGED HADRON ANYTHING, COLLIDING BEAMS [ELECTRON POSITRON], DIFFERENTIAL CROSS SECTION [INCLUSIVE REACTION], ELECTRON POSITRON [COLLIDING BEAMS], INCLUSIVE REACTION [ELECTRON POSITRON], ELECTRON POSITRON [ANNIHILATION], ELECTROPRODUCTION [HADRON], CHARGED PARTICLE [HADRON], ANNIHILATION [ELECTRON POSITRON], ddc:530, SCALING, EXPERIMENTAL RESULTS, 3.6-5.0 GEV-CMS
Abstract

Charged hadron production via e + e − → h ± X where h ± = π ± , K ± , p ̄ has been measured for s values between 13 and 25 GeV 2 . Inclusive cross sections and the evidence for scaling are presented.

Published
1977
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7. On the origin of inclusive electron events in $e^+ e^-$ annihilation between 3.6-GeV and 5.2-GeV

Author

Brandelik, R., Braunschweig, W., Gadermann, E., Hultschig, H., Joos, P., Koch, W., Kotz, U., Krehbiel, H., Kreinick, D., Lynch, H. L., McNeely, W. A., Moffeit, K. C., Martyn, H.-U., Notz, D., Rusch, R., Schliwa, M., Wiik, B. H., Wolf, G., Grindhammer, Guenter, Ludwig, J., Mess, K. H., Petersen, A., Poelz, G., Sander, H. G., Ringel, J., Romer, O., Sauerberg, K., Schmueser, Peter, de Boer, W., Buschhorn, G., Fues, W., von Gagern, C., Gunderson, B., Kotthaus, R., Schmitz, D., Lierl, H., Oberlack, H., Orito, S., Suda, T., Totsuka, Y., Yamada, S., DASP Collaboration, Sturm, W., Wallraff, W., Cords, D., Felst, R., and Fries, R.

Subjects
ELECTRON [FINAL STATE], K: MULTIPLE PRODUCTION, +ELECTRON+ANYTHING%22">ELECTRON POSITRON --> ELECTRON ANYTHING, MULTIPLE PRODUCTION: PI, RATIO [MULTIPLE PRODUCTION], MULTIPLE PRODUCTION: K, DASP [MAGNETIC DETECTOR], ddc:530, K [MULTIPLE PRODUCTION], COLLIDING BEAMS: ELECTRON POSITRON, EXPERIMENTAL RESULTS, ELECTRON: FINAL STATE, FINAL STATE [ELECTRON], SEMILEPTONIC DECAY [CHARMED PARTICLE], DESY DORIS STOR, 3.6-5.2 GEV-CMS, MULTIPLICITY [ELECTRON], MULTIPLE PRODUCTION [K], ELECTRON POSITRON: INCLUSIVE REACTION, PI: MULTIPLE PRODUCTION, COLLIDING BEAMS [ELECTRON POSITRON], ANNIHILATION: ELECTRON POSITRON, ELECTRON POSITRON [COLLIDING BEAMS], INCLUSIVE REACTION [ELECTRON POSITRON], FINAL STATE: ELECTRON, ELECTRON POSITRON: COLLIDING BEAMS, CHARMED PARTICLE: SEMILEPTONIC DECAY, MULTIPLE PRODUCTION: RATIO, ELECTRON POSITRON [ANNIHILATION], PI [MULTIPLE PRODUCTION], ELECTRON: MULTIPLICITY, ANNIHILATION [ELECTRON POSITRON], MULTIPLE PRODUCTION [PI], High Energy Physics::Experiment, MAGNETIC DETECTOR: DASP, ELECTRON POSITRON: ANNIHILATION
Abstract

(1977). doi:10.1016/0370-2693(77)90360-4, 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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8. Radiative decays of the J/$\psi$ and evidence for a new heavy resonance

Author

Braunschweig, W., Martyn, H.-U., Hultschig, H., Joos, P., Koch, W., Kotz, U., Krehbiel, H., Kreinick, D., McNeely, W. A., Moffeit, K. C., Petersen, A., Schliwa, M., Sander, H. G., Wiik, B. H., Wolf, G., Grindhammer, Guenter, Ludwig, J., Mess, K. H., Poelz, G., Ringel, J., Sauerberg, K., Schmueser, Peter, de Boer, W., Schmitz, Daniel, Buschhorn, G., Gunderson, B., Kotthaus, R., Lierl, H., Oberlack, H., Pretzl, K., Orito, S., Suda, T., Totsuka, Y., Yamada, S., Sturm, W., DASP Collaboration, Wallraff, W., Berkelman, Karl, Cords, D., Felst, R., and Gadermann, E.

Subjects
RADIATIVE DECAY: WIDTH, J/PSI(3100): ELECTROPRODUCTION, ELECTROPRODUCTION [J/PSI(3100)], FINAL STATE [PHOTON], ETA(549), (3PHOTON) [FINAL STATE], J/PSI(3100): BRANCHING RATIO, FINAL STATE [PI0], EXPERIMENTAL RESULTS [DESY DORIS STOR], EXPERIMENTAL RESULTS: DESY DORIS STOR, +X%282830%29+PHOTON%22">J/PSI(3100) --> X(2830) PHOTON, WIDTH: RADIATIVE DECAY, BRANCHING RATIO [J/PSI(3100)], +3PHOTON%22">J/PSI(3100) --> 3PHOTON, +ETA%28958%29+PHOTON%22">J/PSI(3100) --> ETA(958) PHOTON, +PI0+PHOTON%22">J/PSI(3100) --> PI0 PHOTON, PI0 [FINAL STATE], COLLIDING BEAMS [ELECTRON POSITRON], FINAL STATE: (3PHOTON), RADIATIVE DECAY [J/PSI(3100)], ANNIHILATION: ELECTRON POSITRON, ELECTROPRODUCTION: J/PSI(3100), ETA(958), ELECTRON POSITRON: COLLIDING BEAMS, ELECTRON POSITRON [ANNIHILATION], +ETA%28549%29+PHOTON%22">J/PSI(3100) --> ETA(549) PHOTON, ANNIHILATION [ELECTRON POSITRON], PI0: FINAL STATE, J/PSI(3100) [ELECTROPRODUCTION], X(2830), J/PSI(3100): RADIATIVE DECAY, MAGNETIC SPECTROMETER: DASP, FINAL STATE: PI0, PHOTON [FINAL STATE], PHOTON: FINAL STATE, WIDTH [RADIATIVE DECAY], DESY DORIS STOR [EXPERIMENTAL RESULTS], ddc:530, DESY DORIS STOR: EXPERIMENTAL RESULTS, COLLIDING BEAMS: ELECTRON POSITRON, 3.1 GEV-CMS, FINAL STATE: PHOTON, DASP [MAGNETIC SPECTROMETER], ELECTRON POSITRON [COLLIDING BEAMS], RADIATIVE DECAY [WIDTH], High Energy Physics::Experiment, ELECTRON POSITRON: ANNIHILATION
Abstract

(1977). doi:10.1016/0370-2693(77)90114-9, 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 π o γ 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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9. Evidence for the F meson

Author

Brandelik, R., Braunschweig, W., Gadermann, E., Hultschig, H., Joos, P., Koch, W., Kotz, U., Krehbiel, H., Kreinick, D., Lynch, H. L., McNeely, W. A., Mikenberg, G., Martyn, H.-U., Moffeit, K. C., Notz, D., Rusch, R., Schliwa, M., Shapira, A., Wiik, B. H., Wolf, G., Grindhammer, Guenter, Ludwig, J., Mess, K. H., Sander, H. G., Petersen, A., Poelz, G., Ringel, J., Romer, O., Sauerberg, K., Schmueser, Peter, de Boer, W., Buschhorn, G., Fues, W., von Gagern, C., Schmitz, D., Gunderson, B., Kotthaus, R., Lierl, H., Oberlack, H., Orito, S., Suda, T., Totsuka, Y., Yamada, S., DASP Collaboration, Sturm, W., Wallraff, W., Cords, D., Felst, R., and Fries, R.

Subjects
PRODUCTION: PHOTON, MASS: F*(2140), F- [POSTULATED PARTICLE], PRODUCTION [ETA(549)], PRODUCTION: ETA(549), +F+PHOTON%22">F*(2140) --> F PHOTON, ASSOCIATED PRODUCTION [CHARMED MESON], (ETA(549) PI-) [MASS SPECTRUM], F: MASS, ETA(549) [PRODUCTION], F*(2140) [POSTULATED PARTICLE], CHARMED MESON: ELECTROPRODUCTION, MASS [F*(2140)], MASS SPECTRUM: (ETA(549) PI-), +F*%282140%29+F%22">ELECTRON POSITRON --> F*(2140) F, (ETA(549) PI-): MASS SPECTRUM, ELECTRON POSITRON: INCLUSIVE REACTION, COLLIDING BEAMS [ELECTRON POSITRON], PRODUCTION [PHOTON], POSTULATED PARTICLE: F, +2F*%282140%29%22">ELECTRON POSITRON --> 2F*(2140), ANNIHILATION: ELECTRON POSITRON, ELECTROPRODUCTION [CHARMED MESON], ELECTRON POSITRON: COLLIDING BEAMS, F+ [POSTULATED PARTICLE], ELECTRON POSITRON [ANNIHILATION], ANNIHILATION [ELECTRON POSITRON], MASS: F, F*(2140): MASS, F [MASS], CHARMED MESON [ASSOCIATED PRODUCTION], MASS SPECTRUM: TWO-PHOTON, TWO-PHOTON: MASS SPECTRUM, CHARMED MESON: ASSOCIATED PRODUCTION, (ETA(549) PI+): MASS SPECTRUM, +ETA%28549%29+PI%22">F --> ETA(549) PI, 4.0-5.2 GEV-CMS, PHOTON: PRODUCTION, POSTULATED PARTICLE: F+, MASS SPECTRUM [TWO-PHOTON], DASP [MAGNETIC DETECTOR], ddc:530, ETA(549): PRODUCTION, F*(2140) [MASS], COLLIDING BEAMS: ELECTRON POSITRON, EXPERIMENTAL RESULTS, CHARMED MESON [ELECTROPRODUCTION], DESY DORIS STOR, MASS SPECTRUM: (ETA(549) PI+), MASS SPECTRUM [(ETA(549) PI-)], ELECTROPRODUCTION: CHARMED MESON, POSTULATED PARTICLE: F*(2140), MASS SPECTRUM [(ETA(549) PI+)], MASS [F], ELECTRON POSITRON [COLLIDING BEAMS], INCLUSIVE REACTION [ELECTRON POSITRON], (ETA(549) PI+) [MASS SPECTRUM], ASSOCIATED PRODUCTION: CHARMED MESON, PHOTON [PRODUCTION], TWO-PHOTON [MASS SPECTRUM], MAGNETIC DETECTOR: DASP, ELECTRON POSITRON: ANNIHILATION
Abstract

(1977). doi:10.1016/0370-2693(77)90361-6, 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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10. SEARCH FOR NARROW QUARKONIUM STATES AND PAIR PRODUCTION OF NEW HEAVY QUARKS AT c.m. ENERGIES FROM 33-GeV TO 36.7-GeV

Author

Behrend, H. J., Chen, Ch., Fries, D. C., Flugge, G., Hopp, G., Muller, H., Randoll, H., Schmidt, G., Schneider, H., de Boer, W., Buschhorn, G., Grindhammer, Guenter, Field, J. H., Grosse-Wiesmann, P., Gunderson, B., Kiesling, Christian M., Kotthaus, R., Kruse, U., Lierl, H., Luers, D., Meyer, T., Moss, L., Oberlack, H., Gumpel, U., Schacht, P., Schachter, M. J., Snyder, A., Steiner, H., Carnesecchi, G., Cordier, A., Davier, M., Fournier, D., Grivaz, J. F., Haissinski, J., Schroder, V., Journe, V., Klarsfeld, A., Laplanche, F., Le Diberder, F., Mallik, U., Veillet, J. J., Weitsch, A., George, R., Goldberg, M., Grossetete, B., Sindt, H., Kapusta, Frederic, Kovacs, F., London, G., Poggioli, L., Rivoal, M., Aleksan, R., Bouchez, J., Cozzika, G., Ducros, Y., Gaidot, A., Apel, W. D., Jadach, S., Lavagne, Y., Pamela, J., Pansart, J. P., Pierre, F., CELLO Collaboration, Bodenkamp, J., Chrobaczek, D., and Engler, J.

Subjects
MULTIPLE PRODUCTION [HADRON], RATIO: TOTAL CROSS SECTION, DESY PETRA STOR, TOTAL CROSS SECTION [RATIO], TRUTHONIUM [SEARCH FOR], HADRON: ELECTROPRODUCTION, MULTIPLE PRODUCTION: HADRON, QUARK: TRUTHONIUM, ELECTROPRODUCTION [HADRON], TOTAL CROSS SECTION [ENERGY DEPENDENCE], TRUTHONIUM [QUARK], ENERGY DEPENDENCE: TOTAL CROSS SECTION, ELECTROPRODUCTION: HADRON, TOTAL CROSS SECTION: RATIO, COLLIDING BEAMS: ELECTRON POSITRON, EXPERIMENTAL RESULTS, ENERGY DEPENDENCE [TOTAL CROSS SECTION], TOTAL CROSS SECTION: ENERGY DEPENDENCE, HADRON [ELECTROPRODUCTION], SEARCH FOR: TRUTHONIUM, COLLIDING BEAMS [ELECTRON POSITRON], HADRON [MULTIPLE PRODUCTION], HADRON: MULTIPLE PRODUCTION, ANNIHILATION: ELECTRON POSITRON, ELECTRON POSITRON [COLLIDING BEAMS], JET: SPHERICITY, RATIO [TOTAL CROSS SECTION], SPHERICITY [JET], ELECTRON POSITRON: COLLIDING BEAMS, ELECTRON POSITRON [ANNIHILATION], ANNIHILATION [ELECTRON POSITRON], CELLO, 33.0-36.7 GEV-CMS, ELECTRON POSITRON: ANNIHILATION
Abstract

13 pp. (1981).

Published
1981
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11. Proposal to upgrade the Cello Detector

Author

Behrend, H. J., Burger, J., Winter, G. g., Zimmermann, W., Bussey, P. j., Dainton, J. b., Hendry, D., Raine, C., Scarr, J. m., Skillicorn, I. o., Smith, K. m., Blobel, V., Criegee, L., Burkart, D., Poppe, M., Spitzer, H., Achterberg, O., D'Agostini, G., Apel, W. d., Engler, J., Flugge, G., Fries, D. c., Fues, W., Franke, G., Hopp, G., Kruger, M., Muller, H., Randoll, H., Schmidt, G., Schneider, H., De Boer, W., Buschhorn, G., Grindhammer, Guenter, Grosse-Wiesmann, P., Gaspero, Mario, Gunderson, B., Kiesling, Christian M., Kovacs, F., Poggioli, L., Rivoal, M., Aleksan, R., Kotthaus, R., Lierl, H., Luers, D., Oberlack, H., Meyer, J., Schacht, P., Alexander, G., Bella, G., Gnat, Y., Grunhaus, J., Fournier, D., Grivaz, J. f., Haissinski, J., Journe, V., Bonneaud, G., Schroder, V., Cordier, A., Davier, M., Jarry, P., Lavagne, Y., Pamela, J., Pansart, J. p., Pierre, F., Bouchez, J., Carnesecchi, G., Cozzika, G., Sindt, H., Ducros, Y., Gaidot, A., Le Diberder, F., Mallik, U., Veillet, J. j., Field, J. h., George, R., Goldberg, M., Hamon, O., Kapusta, Frederic, Stella, B., CELLO Collaboration, and Timm, U.

Subjects
VALIDITY TEST [QUANTUM CHROMODYNAMICS], PROPOSED [EXPERIMENTAL EQUIPMENT], MODEL: PARTON, DESY PETRA STOR, QUARK: TRUTHONIUM, TABLES, TRUTHONIUM [QUARK], SCINTILLATION COUNTER: LEAD-GLASS, NUMERICAL CALCULATIONS, PARTICLE IDENTIFICATION [CHARGED PARTICLE], TRIGGER, INELASTIC SCATTERING: ELECTRON POSITRON, TWO-PHOTON: EXCHANGE, EXCHANGE [TWO-PHOTON], EFFECT: ELECTROWEAK INTERACTION, SHOWERS: ELECTROMAGNETIC, ELECTROWEAK INTERACTION [EFFECT], COLLIDING BEAMS [ELECTRON POSITRON], INELASTIC SCATTERING [ELECTRON POSITRON], ANNIHILATION: ELECTRON POSITRON, ELECTRON POSITRON: COLLIDING BEAMS, ELECTRON POSITRON [ANNIHILATION], ELECTROWEAK INTERACTION: EFFECT, QUANTUM CHROMODYNAMICS: VALIDITY TEST, ANNIHILATION [ELECTRON POSITRON], QUARK [PAIR PRODUCTION], SHOWERS: ENERGY, QUARK: PAIR PRODUCTION, ELECTRON POSITRON [INELASTIC SCATTERING], PAIR PRODUCTION [QUARK], EXPERIMENTAL EQUIPMENT: PROPOSED, SHOWER DETECTOR, ELECTRON POSITRON: INELASTIC SCATTERING, DRIFT CHAMBER, REVIEW, ELECTROMAGNETIC [SHOWERS], STRUCTURE FUNCTION [PHOTON], COLLIDING BEAMS: ELECTRON POSITRON, TWO-PHOTON [EXCHANGE], CHARGED PARTICLE: PARTICLE IDENTIFICATION, ENERGY [SHOWERS], EFFECT [ELECTROWEAK INTERACTION], PAIR PRODUCTION: QUARK, ELECTRON POSITRON [COLLIDING BEAMS], PROPOSED EXPERIMENT, EXCHANGE: TWO-PHOTON, DATA ACQUISITION, CELLO, TRACK DATA ANALYSIS, PARTON [MODEL], PHOTON: STRUCTURE FUNCTION, ELECTRON POSITRON: ANNIHILATION, COSTS, LEAD-GLASS [SCINTILLATION COUNTER]
Abstract

61 pp. (1983).

Published
1983
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