Study of the ηc(1 1S0) state of charmonium formed in p¯p annihilations and a search for the ηc′(2 1S0)
The E760 Collaboration performed an experiment in the Antiproton Accumulator at Fermilab to study the two photon decay of the ηc(1 1S0) charmonium state formed in p¯p annihilations. This resulted in a new measurement of the mass Mηc=2988.3-3.1+3.3 MeV/c2 and of the product B(ηc→p¯p)×Γ(ηc→γγ) =(8.1-2...
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E-Artikel |
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1995 |
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Online-Ressource 16 |
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APS Digital Backfile Archive 1893-2003 |
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Enthalten in: Physical review / D - [S.l.] : Soc., 1970, 52(1995), 9, Seite 4839-4854 |
| Übergeordnetes Werk: |
volume:52 ; year:1995 ; number:9 ; pages:4839-4854 ; extent:16 |
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NLEJ250081466 |
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| 520 | |a The E760 Collaboration performed an experiment in the Antiproton Accumulator at Fermilab to study the two photon decay of the ηc(1 1S0) charmonium state formed in p¯p annihilations. This resulted in a new measurement of the mass Mηc=2988.3-3.1+3.3 MeV/c2 and of the product B(ηc→p¯p)×Γ(ηc→γγ) =(8.1-2.0+2.9) eV. We performed a search for the process p¯p→ηc′(2 1S0)→γγ over a limited range of center-of-mass energies. Since no signal was observed, we derived upper limits on the product of branching ratios B(ηc′→p¯p)×B(ηc′→γγ) in the center-of-mass energy range 3584≤ √s ≤3624 MeV. We observed no signal for the nonresonant process p¯+p→γ+γ and obtain upper limits. | ||
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(DE-627)NLEJ250081466 (DE-601)aps:1b60c6c286da3ecf4d325ad31efe6cb693de747d DE-627 ger DE-627 rakwb Study of the ηc(1 1S0) state of charmonium formed in p¯p annihilations and a search for the ηc′(2 1S0) 1995 Online-Ressource 16 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The E760 Collaboration performed an experiment in the Antiproton Accumulator at Fermilab to study the two photon decay of the ηc(1 1S0) charmonium state formed in p¯p annihilations. This resulted in a new measurement of the mass Mηc=2988.3-3.1+3.3 MeV/c2 and of the product B(ηc→p¯p)×Γ(ηc→γγ) =(8.1-2.0+2.9) eV. We performed a search for the process p¯p→ηc′(2 1S0)→γγ over a limited range of center-of-mass energies. Since no signal was observed, we derived upper limits on the product of branching ratios B(ηc′→p¯p)×B(ηc′→γγ) in the center-of-mass energy range 3584≤ √s ≤3624 MeV. We observed no signal for the nonresonant process p¯+p→γ+γ and obtain upper limits. APS Digital Backfile Archive 1893-2003 Armstrong, T. A. oth Bettoni, D. oth Bharadwaj, V. oth Biino, C. oth Blanford, G. oth Borreani, G. oth Broemmelsiek, D. oth Buzzo, A. oth Calabrese, R. oth Ceccucci, A. oth Cester, R. oth Church, M. oth Dalpiaz, P. oth Dalpiaz, P. F. oth Dimitroyannis, D. oth Fabbri, M. oth Fast, J. oth Gianoli, A. oth Ginsburg, C. M. oth Gollwitzer, K. oth Govi, G. oth Hahn, A. oth Hasan, M. oth Hsueh, S. oth Lewis, R. oth Luppi, E. oth Macrí, M. oth Majewska, A. M. oth Mandelkern, M. oth Marchetto, F. oth Marinelli, M. oth Marques, J. oth Marsh, W. oth Martini, M. oth Masuzawa, M. oth Menichetti, E. oth Migliori, A. oth Mussa, R. oth Palestini, S. oth Pallavicini, M. oth Passaggio, S. oth Pastrone, N. oth Patrignani, C. oth Peoples, J. oth Petrucci, F. oth Pia, M. G. oth Pordes, S. oth Rapidis, P. oth Ray, R. oth Reid, J. oth Rinaudo, G. oth Roccuzzo, B. oth Rosen, J. oth Santroni, A. oth Sarmiento, M. oth Savrré, M. oth Schultz, J. oth Seth, K. K. oth Smith, A. oth Smith, G. A. oth Sozzi, M. oth Trokenheim, S. oth Weber, M. F. oth Werkema, S. oth Zhang, Y. oth Zhao, J. oth Zioulas, G. oth Enthalten in Physical review / D [S.l.] : Soc., 1970 52(1995), 9, Seite 4839-4854 Online-Ressource (DE-627)NLEJ248237861 (DE-600)1461167-3 1550-2368 nnns volume:52 year:1995 number:9 pages:4839-4854 extent:16 https://www.tib.eu/de/suchen/id/aps%3A1b60c6c286da3ecf4d325ad31efe6cb693de747d Verlag Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-APS GBV_NL_ARTICLE AR 52 1995 9 4839-4854 16 |
| spelling |
(DE-627)NLEJ250081466 (DE-601)aps:1b60c6c286da3ecf4d325ad31efe6cb693de747d DE-627 ger DE-627 rakwb Study of the ηc(1 1S0) state of charmonium formed in p¯p annihilations and a search for the ηc′(2 1S0) 1995 Online-Ressource 16 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The E760 Collaboration performed an experiment in the Antiproton Accumulator at Fermilab to study the two photon decay of the ηc(1 1S0) charmonium state formed in p¯p annihilations. This resulted in a new measurement of the mass Mηc=2988.3-3.1+3.3 MeV/c2 and of the product B(ηc→p¯p)×Γ(ηc→γγ) =(8.1-2.0+2.9) eV. We performed a search for the process p¯p→ηc′(2 1S0)→γγ over a limited range of center-of-mass energies. Since no signal was observed, we derived upper limits on the product of branching ratios B(ηc′→p¯p)×B(ηc′→γγ) in the center-of-mass energy range 3584≤ √s ≤3624 MeV. We observed no signal for the nonresonant process p¯+p→γ+γ and obtain upper limits. APS Digital Backfile Archive 1893-2003 Armstrong, T. A. oth Bettoni, D. oth Bharadwaj, V. oth Biino, C. oth Blanford, G. oth Borreani, G. oth Broemmelsiek, D. oth Buzzo, A. oth Calabrese, R. oth Ceccucci, A. oth Cester, R. oth Church, M. oth Dalpiaz, P. oth Dalpiaz, P. F. oth Dimitroyannis, D. oth Fabbri, M. oth Fast, J. oth Gianoli, A. oth Ginsburg, C. M. oth Gollwitzer, K. oth Govi, G. oth Hahn, A. oth Hasan, M. oth Hsueh, S. oth Lewis, R. oth Luppi, E. oth Macrí, M. oth Majewska, A. M. oth Mandelkern, M. oth Marchetto, F. oth Marinelli, M. oth Marques, J. oth Marsh, W. oth Martini, M. oth Masuzawa, M. oth Menichetti, E. oth Migliori, A. oth Mussa, R. oth Palestini, S. oth Pallavicini, M. oth Passaggio, S. oth Pastrone, N. oth Patrignani, C. oth Peoples, J. oth Petrucci, F. oth Pia, M. G. oth Pordes, S. oth Rapidis, P. oth Ray, R. oth Reid, J. oth Rinaudo, G. oth Roccuzzo, B. oth Rosen, J. oth Santroni, A. oth Sarmiento, M. oth Savrré, M. oth Schultz, J. oth Seth, K. K. oth Smith, A. oth Smith, G. A. oth Sozzi, M. oth Trokenheim, S. oth Weber, M. F. oth Werkema, S. oth Zhang, Y. oth Zhao, J. oth Zioulas, G. oth Enthalten in Physical review / D [S.l.] : Soc., 1970 52(1995), 9, Seite 4839-4854 Online-Ressource (DE-627)NLEJ248237861 (DE-600)1461167-3 1550-2368 nnns volume:52 year:1995 number:9 pages:4839-4854 extent:16 https://www.tib.eu/de/suchen/id/aps%3A1b60c6c286da3ecf4d325ad31efe6cb693de747d Verlag Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-APS GBV_NL_ARTICLE AR 52 1995 9 4839-4854 16 |
| allfields_unstemmed |
(DE-627)NLEJ250081466 (DE-601)aps:1b60c6c286da3ecf4d325ad31efe6cb693de747d DE-627 ger DE-627 rakwb Study of the ηc(1 1S0) state of charmonium formed in p¯p annihilations and a search for the ηc′(2 1S0) 1995 Online-Ressource 16 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The E760 Collaboration performed an experiment in the Antiproton Accumulator at Fermilab to study the two photon decay of the ηc(1 1S0) charmonium state formed in p¯p annihilations. This resulted in a new measurement of the mass Mηc=2988.3-3.1+3.3 MeV/c2 and of the product B(ηc→p¯p)×Γ(ηc→γγ) =(8.1-2.0+2.9) eV. We performed a search for the process p¯p→ηc′(2 1S0)→γγ over a limited range of center-of-mass energies. Since no signal was observed, we derived upper limits on the product of branching ratios B(ηc′→p¯p)×B(ηc′→γγ) in the center-of-mass energy range 3584≤ √s ≤3624 MeV. We observed no signal for the nonresonant process p¯+p→γ+γ and obtain upper limits. APS Digital Backfile Archive 1893-2003 Armstrong, T. A. oth Bettoni, D. oth Bharadwaj, V. oth Biino, C. oth Blanford, G. oth Borreani, G. oth Broemmelsiek, D. oth Buzzo, A. oth Calabrese, R. oth Ceccucci, A. oth Cester, R. oth Church, M. oth Dalpiaz, P. oth Dalpiaz, P. F. oth Dimitroyannis, D. oth Fabbri, M. oth Fast, J. oth Gianoli, A. oth Ginsburg, C. M. oth Gollwitzer, K. oth Govi, G. oth Hahn, A. oth Hasan, M. oth Hsueh, S. oth Lewis, R. oth Luppi, E. oth Macrí, M. oth Majewska, A. M. oth Mandelkern, M. oth Marchetto, F. oth Marinelli, M. oth Marques, J. oth Marsh, W. oth Martini, M. oth Masuzawa, M. oth Menichetti, E. oth Migliori, A. oth Mussa, R. oth Palestini, S. oth Pallavicini, M. oth Passaggio, S. oth Pastrone, N. oth Patrignani, C. oth Peoples, J. oth Petrucci, F. oth Pia, M. G. oth Pordes, S. oth Rapidis, P. oth Ray, R. oth Reid, J. oth Rinaudo, G. oth Roccuzzo, B. oth Rosen, J. oth Santroni, A. oth Sarmiento, M. oth Savrré, M. oth Schultz, J. oth Seth, K. K. oth Smith, A. oth Smith, G. A. oth Sozzi, M. oth Trokenheim, S. oth Weber, M. F. oth Werkema, S. oth Zhang, Y. oth Zhao, J. oth Zioulas, G. oth Enthalten in Physical review / D [S.l.] : Soc., 1970 52(1995), 9, Seite 4839-4854 Online-Ressource (DE-627)NLEJ248237861 (DE-600)1461167-3 1550-2368 nnns volume:52 year:1995 number:9 pages:4839-4854 extent:16 https://www.tib.eu/de/suchen/id/aps%3A1b60c6c286da3ecf4d325ad31efe6cb693de747d Verlag Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-APS GBV_NL_ARTICLE AR 52 1995 9 4839-4854 16 |
| allfieldsGer |
(DE-627)NLEJ250081466 (DE-601)aps:1b60c6c286da3ecf4d325ad31efe6cb693de747d DE-627 ger DE-627 rakwb Study of the ηc(1 1S0) state of charmonium formed in p¯p annihilations and a search for the ηc′(2 1S0) 1995 Online-Ressource 16 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The E760 Collaboration performed an experiment in the Antiproton Accumulator at Fermilab to study the two photon decay of the ηc(1 1S0) charmonium state formed in p¯p annihilations. This resulted in a new measurement of the mass Mηc=2988.3-3.1+3.3 MeV/c2 and of the product B(ηc→p¯p)×Γ(ηc→γγ) =(8.1-2.0+2.9) eV. We performed a search for the process p¯p→ηc′(2 1S0)→γγ over a limited range of center-of-mass energies. Since no signal was observed, we derived upper limits on the product of branching ratios B(ηc′→p¯p)×B(ηc′→γγ) in the center-of-mass energy range 3584≤ √s ≤3624 MeV. We observed no signal for the nonresonant process p¯+p→γ+γ and obtain upper limits. APS Digital Backfile Archive 1893-2003 Armstrong, T. A. oth Bettoni, D. oth Bharadwaj, V. oth Biino, C. oth Blanford, G. oth Borreani, G. oth Broemmelsiek, D. oth Buzzo, A. oth Calabrese, R. oth Ceccucci, A. oth Cester, R. oth Church, M. oth Dalpiaz, P. oth Dalpiaz, P. F. oth Dimitroyannis, D. oth Fabbri, M. oth Fast, J. oth Gianoli, A. oth Ginsburg, C. M. oth Gollwitzer, K. oth Govi, G. oth Hahn, A. oth Hasan, M. oth Hsueh, S. oth Lewis, R. oth Luppi, E. oth Macrí, M. oth Majewska, A. M. oth Mandelkern, M. oth Marchetto, F. oth Marinelli, M. oth Marques, J. oth Marsh, W. oth Martini, M. oth Masuzawa, M. oth Menichetti, E. oth Migliori, A. oth Mussa, R. oth Palestini, S. oth Pallavicini, M. oth Passaggio, S. oth Pastrone, N. oth Patrignani, C. oth Peoples, J. oth Petrucci, F. oth Pia, M. G. oth Pordes, S. oth Rapidis, P. oth Ray, R. oth Reid, J. oth Rinaudo, G. oth Roccuzzo, B. oth Rosen, J. oth Santroni, A. oth Sarmiento, M. oth Savrré, M. oth Schultz, J. oth Seth, K. K. oth Smith, A. oth Smith, G. A. oth Sozzi, M. oth Trokenheim, S. oth Weber, M. F. oth Werkema, S. oth Zhang, Y. oth Zhao, J. oth Zioulas, G. oth Enthalten in Physical review / D [S.l.] : Soc., 1970 52(1995), 9, Seite 4839-4854 Online-Ressource (DE-627)NLEJ248237861 (DE-600)1461167-3 1550-2368 nnns volume:52 year:1995 number:9 pages:4839-4854 extent:16 https://www.tib.eu/de/suchen/id/aps%3A1b60c6c286da3ecf4d325ad31efe6cb693de747d Verlag Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-APS GBV_NL_ARTICLE AR 52 1995 9 4839-4854 16 |
| allfieldsSound |
(DE-627)NLEJ250081466 (DE-601)aps:1b60c6c286da3ecf4d325ad31efe6cb693de747d DE-627 ger DE-627 rakwb Study of the ηc(1 1S0) state of charmonium formed in p¯p annihilations and a search for the ηc′(2 1S0) 1995 Online-Ressource 16 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The E760 Collaboration performed an experiment in the Antiproton Accumulator at Fermilab to study the two photon decay of the ηc(1 1S0) charmonium state formed in p¯p annihilations. This resulted in a new measurement of the mass Mηc=2988.3-3.1+3.3 MeV/c2 and of the product B(ηc→p¯p)×Γ(ηc→γγ) =(8.1-2.0+2.9) eV. We performed a search for the process p¯p→ηc′(2 1S0)→γγ over a limited range of center-of-mass energies. Since no signal was observed, we derived upper limits on the product of branching ratios B(ηc′→p¯p)×B(ηc′→γγ) in the center-of-mass energy range 3584≤ √s ≤3624 MeV. We observed no signal for the nonresonant process p¯+p→γ+γ and obtain upper limits. APS Digital Backfile Archive 1893-2003 Armstrong, T. A. oth Bettoni, D. oth Bharadwaj, V. oth Biino, C. oth Blanford, G. oth Borreani, G. oth Broemmelsiek, D. oth Buzzo, A. oth Calabrese, R. oth Ceccucci, A. oth Cester, R. oth Church, M. oth Dalpiaz, P. oth Dalpiaz, P. F. oth Dimitroyannis, D. oth Fabbri, M. oth Fast, J. oth Gianoli, A. oth Ginsburg, C. M. oth Gollwitzer, K. oth Govi, G. oth Hahn, A. oth Hasan, M. oth Hsueh, S. oth Lewis, R. oth Luppi, E. oth Macrí, M. oth Majewska, A. M. oth Mandelkern, M. oth Marchetto, F. oth Marinelli, M. oth Marques, J. oth Marsh, W. oth Martini, M. oth Masuzawa, M. oth Menichetti, E. oth Migliori, A. oth Mussa, R. oth Palestini, S. oth Pallavicini, M. oth Passaggio, S. oth Pastrone, N. oth Patrignani, C. oth Peoples, J. oth Petrucci, F. oth Pia, M. G. oth Pordes, S. oth Rapidis, P. oth Ray, R. oth Reid, J. oth Rinaudo, G. oth Roccuzzo, B. oth Rosen, J. oth Santroni, A. oth Sarmiento, M. oth Savrré, M. oth Schultz, J. oth Seth, K. K. oth Smith, A. oth Smith, G. A. oth Sozzi, M. oth Trokenheim, S. oth Weber, M. F. oth Werkema, S. oth Zhang, Y. oth Zhao, J. oth Zioulas, G. oth Enthalten in Physical review / D [S.l.] : Soc., 1970 52(1995), 9, Seite 4839-4854 Online-Ressource (DE-627)NLEJ248237861 (DE-600)1461167-3 1550-2368 nnns volume:52 year:1995 number:9 pages:4839-4854 extent:16 https://www.tib.eu/de/suchen/id/aps%3A1b60c6c286da3ecf4d325ad31efe6cb693de747d Verlag Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-APS GBV_NL_ARTICLE AR 52 1995 9 4839-4854 16 |
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study of the ηc(1 1s0) state of charmonium formed in p¯p annihilations and a search for the ηc′(2 1s0) |
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Study of the ηc(1 1S0) state of charmonium formed in p¯p annihilations and a search for the ηc′(2 1S0) |
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The E760 Collaboration performed an experiment in the Antiproton Accumulator at Fermilab to study the two photon decay of the ηc(1 1S0) charmonium state formed in p¯p annihilations. This resulted in a new measurement of the mass Mηc=2988.3-3.1+3.3 MeV/c2 and of the product B(ηc→p¯p)×Γ(ηc→γγ) =(8.1-2.0+2.9) eV. We performed a search for the process p¯p→ηc′(2 1S0)→γγ over a limited range of center-of-mass energies. Since no signal was observed, we derived upper limits on the product of branching ratios B(ηc′→p¯p)×B(ηc′→γγ) in the center-of-mass energy range 3584≤ √s ≤3624 MeV. We observed no signal for the nonresonant process p¯+p→γ+γ and obtain upper limits. |
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The E760 Collaboration performed an experiment in the Antiproton Accumulator at Fermilab to study the two photon decay of the ηc(1 1S0) charmonium state formed in p¯p annihilations. This resulted in a new measurement of the mass Mηc=2988.3-3.1+3.3 MeV/c2 and of the product B(ηc→p¯p)×Γ(ηc→γγ) =(8.1-2.0+2.9) eV. We performed a search for the process p¯p→ηc′(2 1S0)→γγ over a limited range of center-of-mass energies. Since no signal was observed, we derived upper limits on the product of branching ratios B(ηc′→p¯p)×B(ηc′→γγ) in the center-of-mass energy range 3584≤ √s ≤3624 MeV. We observed no signal for the nonresonant process p¯+p→γ+γ and obtain upper limits. |
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The E760 Collaboration performed an experiment in the Antiproton Accumulator at Fermilab to study the two photon decay of the ηc(1 1S0) charmonium state formed in p¯p annihilations. This resulted in a new measurement of the mass Mηc=2988.3-3.1+3.3 MeV/c2 and of the product B(ηc→p¯p)×Γ(ηc→γγ) =(8.1-2.0+2.9) eV. We performed a search for the process p¯p→ηc′(2 1S0)→γγ over a limited range of center-of-mass energies. Since no signal was observed, we derived upper limits on the product of branching ratios B(ηc′→p¯p)×B(ηc′→γγ) in the center-of-mass energy range 3584≤ √s ≤3624 MeV. We observed no signal for the nonresonant process p¯+p→γ+γ and obtain upper limits. |
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Study of the ηc(1 1S0) state of charmonium formed in p¯p annihilations and a search for the ηc′(2 1S0) |
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Armstrong, T. A. Bettoni, D. Bharadwaj, V. Biino, C. Blanford, G. Borreani, G. Broemmelsiek, D. Buzzo, A. Calabrese, R. Ceccucci, A. Cester, R. Church, M. Dalpiaz, P. Dalpiaz, P. F. Dimitroyannis, D. Fabbri, M. Fast, J. Gianoli, A. Ginsburg, C. M. Gollwitzer, K. Govi, G. Hahn, A. Hasan, M. Hsueh, S. Lewis, R. Luppi, E. Macrí, M. Majewska, A. M. Mandelkern, M. Marchetto, F. Marinelli, M. Marques, J. Marsh, W. Martini, M. Masuzawa, M. Menichetti, E. Migliori, A. Mussa, R. Palestini, S. Pallavicini, M. Passaggio, S. Pastrone, N. Patrignani, C. Peoples, J. Petrucci, F. Pia, M. G. Pordes, S. Rapidis, P. Ray, R. Reid, J. Rinaudo, G. Roccuzzo, B. Rosen, J. Santroni, A. Sarmiento, M. Savrré, M. Schultz, J. Seth, K. K. Smith, A. Smith, G. A. Sozzi, M. Trokenheim, S. Weber, M. F. Werkema, S. Zhang, Y. Zhao, J. Zioulas, G. |
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<?xml version="1.0" encoding="UTF-8"?><collection xmlns="http://www.loc.gov/MARC21/slim"><record><leader>01000naa a22002652 4500</leader><controlfield tag="001">NLEJ250081466</controlfield><controlfield tag="003">DE-627</controlfield><controlfield tag="005">20231114103624.0</controlfield><controlfield tag="007">cr uuu---uuuuu</controlfield><controlfield tag="008">231114s1995 xx |||||o 00| ||und c</controlfield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-627)NLEJ250081466</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-601)aps:1b60c6c286da3ecf4d325ad31efe6cb693de747d</subfield></datafield><datafield tag="040" ind1=" " ind2=" "><subfield code="a">DE-627</subfield><subfield code="b">ger</subfield><subfield code="c">DE-627</subfield><subfield code="e">rakwb</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Study of the ηc(1 1S0) state of charmonium formed in p¯p annihilations and a search for the ηc′(2 1S0)</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">1995</subfield></datafield><datafield tag="300" ind1=" " ind2=" "><subfield code="a">Online-Ressource</subfield></datafield><datafield tag="300" ind1=" " ind2=" "><subfield code="a">16</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">Text</subfield><subfield code="b">txt</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">Computermedien</subfield><subfield code="b">c</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">Online-Ressource</subfield><subfield code="b">cr</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">The E760 Collaboration performed an experiment in the Antiproton Accumulator at Fermilab to study the two photon decay of the ηc(1 1S0) charmonium state formed in p¯p annihilations. This resulted in a new measurement of the mass Mηc=2988.3-3.1+3.3 MeV/c2 and of the product B(ηc→p¯p)×Γ(ηc→γγ) =(8.1-2.0+2.9) eV. We performed a search for the process p¯p→ηc′(2 1S0)→γγ over a limited range of center-of-mass energies. Since no signal was observed, we derived upper limits on the product of branching ratios B(ηc′→p¯p)×B(ηc′→γγ) in the center-of-mass energy range 3584≤ √s ≤3624 MeV. We observed no signal for the nonresonant process p¯+p→γ+γ and obtain upper limits.</subfield></datafield><datafield tag="533" ind1=" " ind2=" "><subfield code="f">APS Digital Backfile Archive 1893-2003</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Armstrong, T. 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