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Your search keyword '"Strohbusch, U."' showing total 7 results
Start Over Author "Strohbusch, U." Topic electron positron [colliding beams]
7 results on '"Strohbusch, U."'

1. Measurement of $\pi^0\pi^0$ production in two-photon collisions

Author

Marsiske, H., Antreasyan, D., Cabenda, R., Cartacci, A., Cavalli-Sforza, M., Clare, R., Compagnucci, A., Conforto, G., Cooper, S., Cowan, R., Coyne, D., Engler, A., Bartels, H. W., Fairfield, K., Folger, G., Fridman, A., Gaiser, D., Gelphman, D., Glaser, G., Godfrey, G., Graaf, K., Heimlich, F. H., Heinsius, F. H., Besset, D., Hofstadter, R., Irion, J., Jakubowski, Z., Janssen, H., Karch, K., Keh, S., Kiel, T., Kilian, H., Kirkbride, I., Kloiber, T., Bieler, Ch., Kobel, M., Koch, W., Konig, A. C., Konigsmann, K., Kraemer, R. W., Kruger, S., Landi, G., Lee, R., Leffler, S., Lekebusch, R., Bienlein, J. K., Litke, A. M., Lockman, W. S., Lowe, S., Lurz, B., Marlow, D., Maschmann, W., McBride, P., Messing, F., Metzger, W. J., Meyer, H., Bizzeti, A., Monteleoni, B., Muryn, B., Nernst, R., Niczyporuk, B., Nowak, G., Peck, C., Pelfer, P. G., Pollock, B., Porter, F. C., Prindle, D., Bloom, E. D., Ratoff, P., Reidenbach, M., Renger, B., Rippich, C., Scheer, M., Schmitt, P., Schotanus, J., Schutte, J., Schwarz, A., Sievers, D., Brock, I., Skwarnicki, T., Stock, V., Strauch, K., Strohbusch, U., Tompkins, J., Trost, H. J., van Uitert, B., Van de Walle, R. T., Vogel, H., Voigt, A., Brockmuller, K., Volland, U., Wachs, K., Wacker, K., Walk, W., Wegener, H., Williams, D. A., Zschorsch, P., and Crystal Ball Collaboration

Subjects
two-photon [exchange], channel cross section, photon photon [interaction], electroproduction [pi0], width [f2(1270)], DESY DORIS Stor, inelastic scattering [electron positron], +2pi0+positron+electron%22">electron positron --> 2pi0 positron electron, pi0 [electroproduction], helicity, ((1, interaction [photon photon], angular dependence [differential cross section], differential cross section [angular dependence], width [f0(1400)], colliding beams [electron positron], electron positron [inelastic scattering], ddc:530, electron positron [colliding beams], mass spectrum [(2pi0)], Crystal Ball, exchange [two-photon], (2pi0) [mass spectrum], width [f0(980)], experimental results
Abstract

The reaction $e^+e^−→e^+e^−π^0π^0$ has been analyzed using 97pb$^{−1}$ of data taken with the Crystal Ball detector at the DESY $e^−e^+$ storage ring DORIS II at beam energies around 5.3 GeV. For the first time we have measured the cross section for $γγ→π^0π^0$ for π0π0 mvariant masses ranging from threshold to about 2 GeV. We measure an approximately flat cross section of about 10 nb for W=$mπ^0π^0

Published
1990
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2. Limits on axion and light Higgs boson production in $\Upsilon (1S)$ decays

Author

Antreasyan, D., Bartels, H. W. S., Cartacci, A., Cavalli-Sforza, M., Clare, R., Compagnucci, A., Conforto, G., Cooper, S., Cowan, R., Coyne, D. G., Engler, A., Fairfield, K., Besset, D., Folger, G., Fridman, A., Gaiser, J., Gelphman, D., Glaser, G., Godfrey, G., Graaf, K., Heimlich, F. H., Heinsius, F. H., Hofstadter, R., Bieler, C., Irion, J., Jakubowski, Z., Janssen, H., Karch, K., Keh, S., Kiel, T., Kilian, H., Kirkbride, I., Kloiber, T., Kobel, M., Bienlein, J. K., Koch, W. S., Konig, A. C., Konigsmann, Kay, Kraemer, R. W., Kruger, S., Landi, G., Lee, R., Leffler, S., Lekebusch, R., Litke, A., Bizzeti, A., Lockman, William S., Lowe, S., Lurz, B., Marlow, Daniel R., Marsiske, H., Maschmann, W. S., McBride, P., Messing, F., Metzger, W. J., Meyer, H., Bloom, Elliott D., Monteleoni, B., Muryn, B., Nernst, R., Niczyporuk, B., Nowak, G., Peck, C., Pelfer, P. G., Pollock, B., Porter, F., Prindle, D., Brock, I., Ratoff, P., Reidenbach, M., Renger, B., Rippich, C., Scheer, M., Schmitt, P., Schotanus, J., Schutte, J., Schwarz, Andreas S., Sievers, D., Brockmuller, K., Skwarnicki, T., Stock, V., Strauch, K., Strohbusch, U., Tompkins, J., Trost, H. J., van Uitert, B., Van de Walle, R. T., Vogel, H., Voigt, A., Cabenda, R., Volland, U., Wachs, K., Wacker, K., Walk, W. S., Wegener, H., Williams, D., Zschorsch, P., and Crystal Ball Collaboration

Subjects
axion [search for], annihilation: electron positron, +photon+axion%22">Upsilon(9460) --> photon axion, Upsilon(9460) [electroproduction], radiative decay [Upsilon(9460)], DESY DORIS Stor, Upsilon(9460): electroproduction, branching ratio: upper limit, (photon): energy spectrum, annihilation [electron positron], electron positron: annihilation, Higgs particle [mass], electroproduction: Upsilon(9460), Higgs particle: search for, 10.57 GeV-cms [9.46], S055H2A, radiative decay: Upsilon(9460), postulated particle: axion, energy spectrum: (photon), +Higgs+particle+photon%22">Upsilon(9460) --> Higgs particle photon, search for: axion, ddc:530, electron positron [colliding beams], search for [Higgs particle], mass: Higgs particle, electron positron [annihilation], energy spectrum [(photon)], mass [Higgs particle], electron positron: colliding beams, Upsilon(9460) [radiative decay], Upsilon(9460): width, Higgs particle: mass, colliding beams: electron positron, 9.46: 10.57 GeV-cms, S029AXQ, colliding beams [electron positron], upper limit [branching ratio], electroproduction [Upsilon(9460)], width [Upsilon(9460)], axion [postulated particle], (photon) [energy spectrum], Crystal Ball, Upsilon(9460): radiative decay, experimental results
Abstract

7 pp. (1990)., We have searched for axion and light Higgs boson production in the channel $ϒ (1S)$ → $(a^0 or h^0) + γ$, where the non-interacting axion a0 and the Higgs boson $h^0$ do not decay in the detector. We find no evidence for an axion and give an upper limit,$ Br(ϒ (1S) → a^0γ) < 4.0 × 10^{−5} (90% CL)$, for long-lived axions. Combining our limit with the previous search in J/ψ decays, we are able to rule out the axion in the standard model with first order QCD corrections. Our $ϒ (1S)$ data also rule out a Higgs boson with mass mh < 86 MeV.

Published
1990
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3. Formation of the Pseudoscalars $\pi^0$, $\eta$ and $\eta^\prime$ in the Reaction $\gamma \gamma \to \gamma \gamma$

Author

Williams, D., Antreasyan, D., Cabenda, R., Cartacci, A., Cavalli-Sforza, M., Clare, R., Compagnucci, A., Conforto, G., Cooper, S., Cowan, R., Coyne, D. G., Drews, G., Bartels, H. W. S., Engler, A., Fairfield, K., Folger, G., Fridman, A., Gaiser, J., Gelphman, D., Glaser, G., Godfrey, G., Heimlich, F. H., Hofstadter, R., Besset, D., Irion, J., Jakubowski, Z., Karch, K., Keh, S., Kilian, H., Kirkbride, I., Kloiber, T., Kobel, M., Koch, W. S., Konig, A. C., Bieler, C., Konigsmann, Kay, Kraemer, R. W. S., Kruger, S., Landi, G., Lee, Roger A., Leffler, S., Lekebusch, R., Lockman, William S., Lowe, S., Lurz, B., Bienlein, J. K., Marlow, Daniel R., Marsiske, H., Maschmann, W. S., McBride, P., Messing, F., Metzger, W. J., Meyer, H., Monteleoni, B., Nernst, R., Niczyporuk, B., Bizzeti, A., Nowak, G., Peck, C., Pelfer, P. G., Pollock, B., Porter, F., Prindle, D., Ratoff, P., Reidenbach, M., Renger, B., Rippich, C., Bloom, Elliott D., Scheer, M., Schmitt, P., Schotanus, J., Schutte, J., Schwarz, Andreas S., Selonke, F., Sievers, D., Skwarnicki, T., Stock, V., Strauch, K., Brock, I., Strohbusch, U., Tompkins, J., Trost, H. J., Van de Walle, R. T., Vogel, H., Voigt, A., Volland, U., Wachs, K., Wacker, K., Walk, W. S., Brockmuller, K., Wegener, H., Zschorsch, P., and Crystal Ball Collaboration

Subjects
PSEUDOSCALAR MESON [ELECTROPRODUCTION], ELECTRON POSITRON [INELASTIC SCATTERING], SEARCH FOR [NARROW RESONANCE], BIBLIOGRAPHY, WIDTH [ETA], UPPER LIMIT, +POSITRON+ELECTRON+2PHOTON%22">ELECTRON POSITRON --> POSITRON ELECTRON 2PHOTON, EXCLUSIVE REACTION [PHOTON PHOTON], RADIATIVE DECAY [PSEUDOSCALAR MESON], WIDTH [ETA(958)], +2PHOTON%22">PSEUDOSCALAR MESON --> 2PHOTON, 9.4-10.6 GEV-CMS, ELECTROPRODUCTION [PSEUDOSCALAR MESON], ddc:530, EXPERIMENTAL RESULTS, DESY DORIS II STOR, TWO-PHOTON [EXCHANGE], EXCHANGE [TWO-PHOTON], COLLIDING BEAMS [ELECTRON POSITRON], INELASTIC SCATTERING [ELECTRON POSITRON], NARROW RESONANCE [SEARCH FOR], WIDTH [PI0], ELECTRON POSITRON [COLLIDING BEAMS], +PSEUDOSCALAR+MESON+POSITRON+ELECTRON%22">ELECTRON POSITRON --> PSEUDOSCALAR MESON POSITRON ELECTRON, PSEUDOSCALAR MESON [RADIATIVE DECAY], BRANCHING RATIO [WIDTH], Crystal Ball
Abstract

The Crystal Ball detector has been used at the DORIS II storage ring at DESY to study the reaction e+e−→e+e−γ*γ*→e+e−γγ, where X is a narrow resonance with mass between 100 and 3000 MeV. Formation of π0, η, and η’ mesons is observed, and the following meson partial widths are obtained: Γπ0Γ0→γγ=7.7±0.5±0.5 eV, Γη−γγ=0.514±0.017±0.035 keV, and Γη’→γγ=4.7±0.5±0.5 keV. No other narrow resonances are observed, and upper limits are given for the product ΓX→γγBX→γγ. .AE

Published
1988
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4. Total Cross-section for Hadron Production by $e^+ e^-$ Annihilation Between 9.4-{GeV} and 9.5-{GeV}

Author

Bock, P., Heinzelmann, G., Niczyporuk, B., Rippich, C., Schmitz, M., Vogel, H., Heimlich, F. H., Lezoch, P., Strohbusch, U., DESY-Hamburg-Heidelberg-MPI München Collaboration, Pietrzyk, B., Blanar, G., Blum, W., Dietl, H., Lorenz, E., Richter, Robert, Bienlein, J. K., and Leissner, M.

Subjects
+2GLUON+PHOTON%22">UPSILON(9500) --> 2GLUON PHOTON, RADIATIVE DECAY: UPSILON(9500), Physics::Instrumentation and Detectors, UPSILON(9500) [LEPTONIC DECAY], UPSILON(9500): WIDTH, FOUR-PI-DETECTOR [EXPERIMENTAL RESULTS], UPSILON(9500) [ELECTROPRODUCTION], ENERGY DEPENDENCE: TOTAL CROSS SECTION, DECAY WIDTH [UPSILON(9500)], Nuclear Experiment, UPSILON(9500): RADIATIVE DECAY, TOTAL CROSS SECTION: ENERGY DEPENDENCE, ENERGY DEPENDENCE [TOTAL CROSS SECTION], WIDTH [UPSILON(9500)], EXPERIMENTAL RESULTS [FOUR-PI-DETECTOR], LEPTONIC DECAY: UPSILON(9500), COLLIDING BEAMS [ELECTRON POSITRON], ANNIHILATION: ELECTRON POSITRON, LEPTONIC DECAY [UPSILON(9500)], ELECTRON POSITRON: COLLIDING BEAMS, RATIO [TOTAL CROSS SECTION], ELECTRON POSITRON [ANNIHILATION], RADIATIVE DECAY [UPSILON(9500)], ANNIHILATION [ELECTRON POSITRON], DECAY WIDTH: UPSILON(9500), UPSILON(9500): ELECTROPRODUCTION, UPSILON(10000): LEPTONIC DECAY, DECAY WIDTH: UPSILON(10000), HADRONIC DECAY [UPSILON(9500)], HADRONIC DECAY: UPSILON(10000), 9.4-9.5: 10.0 GEV-CM, LEPTONIC DECAY [UPSILON(10000)], RATIO: TOTAL CROSS SECTION, ELECTROPRODUCTION: UPSILON(9500), UPSILON(9500) [RADIATIVE DECAY], TOTAL CROSS SECTION [RATIO], 10.0 GEV-CM [9.4-9.5], UPSILON(10000): HADRONIC DECAY, TOTAL CROSS SECTION [ENERGY DEPENDENCE], UPSILON(10000) [LEPTONIC DECAY], HADRONIC DECAY: UPSILON(9500), EXPERIMENTAL RESULTS: FOUR-PI-DETECTOR, ddc:530, DECAY WIDTH [UPSILON(10000)], UPSILON(9500): DECAY WIDTH, TOTAL CROSS SECTION: RATIO, UPSILON(10000) [HADRONIC DECAY], COLLIDING BEAMS: ELECTRON POSITRON, UPSILON(9500): HADRONIC DECAY, UPSILON(9500) [DECAY WIDTH], UPSILON(9500): LEPTONIC DECAY, DESY DORIS STOR, FOUR-PI-DETECTOR: EXPERIMENTAL RESULTS, LEPTONIC DECAY: UPSILON(10000), ELECTRON POSITRON [COLLIDING BEAMS], ELECTROPRODUCTION [UPSILON(9500)], UPSILON(10000) [DECAY WIDTH], UPSILON(9500) [HADRONIC DECAY], HADRONIC DECAY [UPSILON(10000)], UPSILON(10000): DECAY WIDTH, High Energy Physics::Experiment, ELECTRON POSITRON: ANNIHILATION
Abstract

(1980). doi:10.1007/BF01588838, The total cross section fore+e− annihilation into hadrons for center of mass energies from 9.4 to 9.5 GeV has been measured with the nonmagnetic DESY-Heidelberg detector at DORIS. A value ofR=σhad/σµµ=3.8±0.7 for the continuum region around the Υ (9.46) resonance has been determined. The ratioΓeeΓhad/Γtot of electronic, hadronic and total widths has been reevaluated to be (1.00±0.23) keV for the Υ resonance and (0.37±0.16) keV for the Υ′. In addition, a search for directly produced pohotons from Υ decays of the type Υ→γ+gluon+gluon has been performed. The Υ decay into muon pairs has also been searched for.

Published
1980
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5. Spin Analysis of the $\chi(b$) States

Author

Skwarnicki, T., Antreasyan, D., Conforto, G., Cooper, S., Cowan, R., Coyne, D. G., Edwards, C., Engler, A., Folger, G., Fridman, A., Gaiser, J., Gelphman, D., Besset, D., Godfrey, G., Heimlich, F. H., Hofstadter, R., Irion, J., Jakubowski, Z., Keh, S., Kilian, H., Kirkbride, I., Kloiber, T., Koch, W. S., Bienlein, J. K., Konig, A. C., Konigsmann, Kay, Kraemer, R. W. S., Lee, Roger A., Leffler, S., Lekebusch, R., Litke, A., Lockman, William S., Lowe, S., Lurz, B., Bloom, Elliott D., Marlow, Daniel R., Maschmann, W. S., Matsui, T., Messing, F., Metzger, W. J., Monteleoni, B., Nernst, R., Niczyporuk, B., Nowak, G., Peck, C., Brock, I., Pelfer, P. G., Pollock, B., Porter, F., Prindle, D., Ratoff, P., Renger, B., Rippich, C., Scheer, M., Schmitt, P., Schotanus, J., Cabenda, R., Schwarz, Andreas S., Sievers, D., Strauch, K., Strohbusch, U., Tompkins, J., Trost, H. J., Van de Walle, R. T., Vogel, H., Volland, U., Wacker, K., Cartacci, A., Walk, W. S., Wegener, H., Williams, D., Zschorsch, P., Crystal Ball Collaboration, Cavalli-Sforza, M., and Clare, R.

Subjects
+CHI%2FB%289895%29+PHOTON%22">UPSILON(10020) --> CHI/B(9895) PHOTON, +POSITRON+ELECTRON%22">UPSILON(9460) --> POSITRON ELECTRON, POTENTIAL [MODEL], +MUON%2B+MUON%22">UPSILON(9460) --> MUON+ MUON, SPIN [CHI/B(9895)], ANGULAR CORRELATION, 10.02 GEV-CMS, +UPSILON%289460%29+PHOTON%22">CHI/B(9895) --> UPSILON(9460) PHOTON, +UPSILON%289460%29+PHOTON%22">CHI/B(9915) --> UPSILON(9460) PHOTON, ddc:550, UPSILON(10020) [CASCADE DECAY], CHI/B(9915) [SPIN], UPSILON(10020) [ELECTROPRODUCTION], SPIN [CHI/B(9915)], EXPERIMENTAL RESULTS, DESY DORIS II STOR, UPSILON(10020) [RADIATIVE DECAY], HEAVY [QUARKONIUM], CHI/B(9895) [SPIN], COLLIDING BEAMS [ELECTRON POSITRON], ENERGY SPECTRUM [(PHOTON)], CASCADE DECAY [UPSILON(10020)], RADIATIVE DECAY [UPSILON(10020)], ELECTRON POSITRON [COLLIDING BEAMS], (PHOTON) [ENERGY SPECTRUM], ELECTRON POSITRON [ANNIHILATION], +CHI%2FB%289915%29+PHOTON%22">UPSILON(10020) --> CHI/B(9915) PHOTON, ANNIHILATION [ELECTRON POSITRON], ELECTROPRODUCTION [UPSILON(10020)], Crystal Ball
Abstract

Angular correlations in the cascade reaction e+e−→Υ(2S)→γχb, χb→γΥ, Υ→μ+μ− or Υ→e+e−, have been used for the first time to investigate the spins of the χb states. The results support the χb spins predicted by the potential models of heavy quarkonia.

Published
1987
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6. A Precision Measurement of the $\Upsilon^\prime$ Meson Mass

Author

Barber, D. P., Bremer, H. D., Drews, G., Gaiser, J., Godfrey, G., Leffler, S., Lockman, William S., Lowe, S., Wacker, K., Gelphman, D., Hofstadter, R., Kirkbride, I., Lee, Roger A., Hasemann, H., Litke, A., Matsui, T., Pollock, B., Tompkins, J., Folger, G., Lurz, B., Volland, U., Wegener, H., Cartacci, A., Conforto, G., Philipp, A., De Judicibus, D., Monteleoni, B., Pelfer, P. G., Fridman, A., Heimlich, F., Lekebusch, R., Lezoch, P., Maschmann, W., Nernst, R., Schwarz, Andreas S., Schmidt-Parzefall, W., Sievers, D., Strohbusch, U., Konig, A., Schotanus, J., Van de Walle, R. T., Walk, W., Keh, S., Kilian, H., Konigsmann, Kay, Scheer, M., Schroder, H., Schmitt, P., Aschman, D., ARGUS Collaboration, Ball, Crystal, Schulz, H. D., Selonke, F., Wurth, R., Drescher, A., Grawe, B., Kewisch, J., Hofmann, W., Markees, A., Matthiesen, U., Spengler, J., Wegener, D., Heller, R., Schubert, Klaus R., Stiewe, J., Waldi, R., Weseler, S., Lewin, H. C., Edwards, K., Frisken, William R., Fukunaga, C., Goddard, M., Kim, P., Orr, R. S., Patel, P. M., Prentice, J. D., Seywerd, H., Yoon, T. S., Limberg, T., Ammar, R., Coppage, D., Davis, R., Kwak, N., Bockmann, P., Jonsson, L., Oku, Y., Arefev, A., Danilov, M., Lyubimov, V., Mais, H., Matveev, V., Nagovitsyn, V., Semenov, Yu., Shevchenko, V., Soloshenko, V., Sopov, V., Chernyshev, V., Tikhomirov, I., Chistilin, V., Zaitsev, Yu., Ripken, G., Childers, R., Darden, C. W., Gennow, H., Edwards, C., Peck, C., Porter, F., Ratoff, P., Brock, I., Engler, A., Kraemer, R. W., Rossmanith, R., Marlow, Daniel R., Messing, F., Prindle, D., Renger, B., Rippich, C., Jakubowski, Z., Niczyporuk, B., Nowak, G., Skwarnicki, T., Bienlein, J. K., Schmidt, R., Cooper, S., Gomez, B., Kloiber, T., Koch, W., Schmitz, M., Trost, H. J., Zschorsch, P., Antreasyan, D., Irion, J., Strauch, K., Albrecht, H., Williams, D., Besset, D., Cabenda, R., Cavalli-Sforza, M., Cowan, R., Coyne, D., Newman-Holmes, C., Bloom, Elliott D., Chestnut, R., and Clare, R.

Subjects
ARGUS, MASS [UPSILON(10020)], UPSILON(10020) [MASS], 9.96-10.04 GEV-CMS, COLLIDING BEAMS [ELECTRON POSITRON], ELECTRON POSITRON [COLLIDING BEAMS], ELECTRON [POLARIZED BEAM], POSITRON [POLARIZED BEAM], MASS DIFFERENCE [UPSILON(10020) UPSILON(9460)], ELECTRON POSITRON [ANNIHILATION], POLARIZED BEAM [POSITRON], ANNIHILATION [ELECTRON POSITRON], HADRONIC [TOTAL CROSS SECTION], TOTAL CROSS SECTION [HADRONIC], ddc:530, ELECTROPRODUCTION [UPSILON(10020)], POLARIZED BEAM [ELECTRON], UPSILON(10020) [ELECTROPRODUCTION], UPSILON(10020) UPSILON(9460) [MASS DIFFERENCE], Crystal Ball, EXPERIMENTAL RESULTS, DESY DORIS II STOR
Published
1984
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7. OBSERVATION OF AN EXCESS OF EVENTS IN e+ e- ANNIHILATIONS INTO NEUTRAL FINAL STATES LEADING TO THREE ELECTROMAGNETIC SHOWERS AT 10-GeV

Author

Bienlein, J. K., Horber, E., Strohbusch, U., Bock, P., Heinzelmann, G., Pietrzyk, B., Blanar, G., Blum, W., Dietl, H., Lorenz, E., Richter, Robert, Leissner, M., Niczyporuk, B., Rippich, C., Schmitz, M., Vogel, H., Glawe, U., Heimlich, F. H., and Lezoch, P.

Subjects
COUNTERS AND DETECTORS: EXPERIMENTAL RESULTS, CHANNEL CROSS SECTION, DESY DORIS STOR, SHOWERS: ELECTROMAGNETIC, QUANTUM ELECTRODYNAMICS, COLLIDING BEAMS [ELECTRON POSITRON], +3PHOTON%22">ELECTRON POSITRON --> 3PHOTON, ANNIHILATION: ELECTRON POSITRON, ELECTRON POSITRON [COLLIDING BEAMS], EXPERIMENTAL RESULTS [COUNTERS AND DETECTORS], ELECTRON POSITRON: COLLIDING BEAMS, ELECTRON POSITRON [ANNIHILATION], ANNIHILATION [ELECTRON POSITRON], 9.98-10.10 GEV-CM [9.41-9.51], ELECTROMAGNETIC [SHOWERS], EXPERIMENTAL RESULTS: COUNTERS AND DETECTORS, 9.41-9.51: 9.98-10.10 GEV-CM, COUNTERS AND DETECTORS [EXPERIMENTAL RESULTS], COLLIDING BEAMS: ELECTRON POSITRON, ELECTRON POSITRON: ANNIHILATION
Abstract

15 pp. (1979).

Published
1979
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