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1. 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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2. 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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3. 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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4. 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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5. Formation of the Pseudoscalars $\pi^0$, $\eta$ and $\eta^\prime$ in the Reaction $\gamma \gamma \to \gamma \gamma$

Author

Williams, D., Antreasyan, D., Bartels, H. W. S., Besset, D., Bieler, C., Bienlein, J. K., Bizzeti, A., Bloom, Elliott D., Brock, I., Brockmuller, K., Cabenda, R., Cartacci, A., Cavalli-Sforza, M., Clare, R., Compagnucci, A., Conforto, G., Cooper, S., Cowan, R., Coyne, D. G., Drews, G., Engler, A., Fairfield, K., Folger, G., Fridman, A., Gaiser, J., Gelphman, D., Glaser, G., Godfrey, G., Heimlich, F. H., Hofstadter, R., Irion, J., Jakubowski, Z., Karch, K., Keh, S., Kilian, H., Kirkbride, I., Kloiber, T., Kobel, M., Koch, W. S., Konig, A. 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., Marlow, Daniel R., Marsiske, H., Maschmann, W. S., McBride, P., Messing, F., Metzger, W. J., Meyer, H., Monteleoni, B., Nernst, R., Niczyporuk, B., Nowak, G., Peck, C., Pelfer, P. G., Pollock, B., Porter, F., Prindle, D., Ratoff, P., Reidenbach, M., Renger, B., Rippich, C., Scheer, M., Schmitt, P., Schotanus, J., Schutte, J., Schwarz, Andreas S., Selonke, F., Sievers, D., Skwarnicki, T., Stock, V., Strauch, K., 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., Wegener, H., and Zschorsch, P.

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

Physical review / D 38(5), 1365 - 1376 (1988). doi:10.1103/PhysRevD.38.1365, 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 by Inst., Woodbury, NY

Published
1988
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6. Spin Analysis of the $\chi(b$) States

Author

Skwarnicki, T., Antreasyan, D., Besset, D., Bienlein, J. K., Bloom, Elliott D., Brock, I., Cabenda, R., Cartacci, A., Cavalli-Sforza, M., Clare, R., Conforto, G., Cooper, S., Cowan, R., Coyne, D. G., Edwards, C., Engler, A., Folger, G., Fridman, A., Gaiser, J., Gelphman, D., Godfrey, G., Heimlich, F. H., Hofstadter, R., Irion, J., Jakubowski, Z., Keh, S., Kilian, H., Kirkbride, I., Kloiber, T., Koch, W. S., 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., Marlow, Daniel R., Maschmann, W. S., Matsui, T., Messing, F., Metzger, W. J., Monteleoni, B., Nernst, R., Niczyporuk, B., Nowak, G., Peck, C., Pelfer, P. G., Pollock, B., Porter, F., Prindle, D., Ratoff, P., Renger, B., Rippich, C., Scheer, M., Schmitt, P., Schotanus, J., 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., Walk, W. S., Wegener, H., Williams, D., and Zschorsch, P.

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

Physical review letters 58(10), 972 - 975 (1987). doi:10.1103/PhysRevLett.58.972, 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 by APS, College Park, Md.

Published
1987
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7. Measurement of the $\eta^\prime$ and Search for Other Resonances in $\gamma \gamma \to \eta \pi^0 \pi^0$

Author

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

Subjects
search for: eta(1275), exchange: two-photon, +eta+2pi0+positron+electron%22">electron positron --> eta 2pi0 positron electron, +2PHOTON%22">ETA(1275) --> 2PHOTON, eta(958): width, electron positron: inelastic scattering, postulated particle: eta(1275), electron positron: colliding beams, eta(958): electroproduction, photon photon: interaction, eta(958): radiative decay, mass spectrum: (eta 2pi0), 10 GEV-CMS, E(1420): SEARCH FOR, approx. 10 GeV-cms, Crystal Ball, EXPERIMENTAL RESULTS, DESY DORIS II STOR
Abstract

Physical review / D 36(9), 2633 - 2640 (1987). doi:10.1103/PhysRevD.36.2633, The reaction e+e−→e+e−ηπ0π0 has been observed with the Crystal Ball detector at the DORIS II storage ring at DESY. The ηπ0π0 mass spectrum is dominated by the η’, and the two-photon width Γη’→γγ is determined to be 4.6±0.4±0.6 keV. Limits on ΓX→γγ×BX→ηππ are given for other possible states., Published by Inst., Woodbury, NY

Published
1987
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