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451. Tests of the standard model and constraints on new physics from measurements of fermion-pair production at 189 GeV at LEP

Author

Abbiendi, G., Ackerstaff, K., Alexander, G., Allison, J., Anderson, K. J., Anderson, S., Arcelli, S., Asai, S., Ashby, S. F., Axen, D., Azuelos, G., Ball, A. H., Barberio, E., Barlow, R. J., Batley, J. R., Baumann, S., Bechtluft, J., Behnke, T., Bell, K. W., Bella, G., Bellerive, A., Bentvelsen, S., Bethke, S., Betts, S., Biebel, O., Biguzzi, A., Bloodworth, I. J., Bock, P., Böhme, J., Boeriu, O., Bonacorsi, D., Boutemeur, M., Braibant, S., Bright-Thomas, P., Brigliadori, L., Brown, R. M., Burckhart, H. J., Capiluppi, P., Carnegie, R. K., Carter, A. A., Carter, J. R., Chang, C. Y., Charlton, D. G., Chrisman, D., Ciocca, C., Clarke, P. E. L., Clay, E., Cohen, I., Conboy, J. E., Cooke, O. C., Couchman, J., Couyoumtzelis, C., Coxe, R. L., Cuffiani, M., Dado, S., Dallavalle, G. M., Dallison, S., Davis, R., Jong, S., Roeck, A., Dervan, P., Desch, K., Dienes, B., Dixit, M. S., Donkers, M., Dubbert, J., Duchovni, E., Duckeck, G., Duerdoth, I. P., Estabrooks, P. G., Etzion, E., Fabbri, F., Fanfani, A., Fanti, M., Faust, A. A., Feld, L., Ferrari, P., Fiedler, F., Fierro, M., Fleck, I., Frey, A., Fürtjes, A., Futyan, D. I., Gagnon, P., Gary, J. W., Gaycken, G., Geich-Gimbel, C., Giacomelli, G., Paolo Giacomelli, Gibson, W. R., Gingrich, D. M., Glenzinski, D., Goldberg, J., Gorn, W., Grandi, C., Graham, K., Gross, E., Grunhaus, J., Gruwé, M., Hajdu, C., Hanson, G. G., Hansroul, M., Hapke, M., Harder, K., Harel, A., Hargrove, C. K., Harin-Dirac, M., Hauschild, M., Hawkes, C. M., Hawkings, R., Hemingway, R. J., Herten, G., Heuer, R. D., Hildreth, M. D., Hill, J. C., Hobson, P. R., Hocker, A., Hoffman, K., Homer, R. J., Honma, A. K., Horváth, D., Hossain, K. R., Howard, R., Huntemeyer, P., Igo-Kemenes, P., Imrie, D. C., Ishii, K., Jacob, F. R., Jawahery, A., Jeremie, H., Jimack, M., Jones, C. R., Jovanovic, P., Junk, T. R., Kanaya, N., Kanzaki, J., Karlen, D., Kartvelishvili, V., Kawagoe, K., Kawamoto, T., Kayal, P. I., Keeler, R. K., Kellogg, R. G., Kennedy, B. W., Kim, D. H., Klier, A., Kobayashi, T., Kobel, M., Kokott, T. P., Kolrep, M., Komamiya, S., Kowalewski, R. V., Kress, T., Krieger, P., Krogh, J., Kuhl, T., Kyberd, P., Lafferty, G. D., Landsman, H., Lanske, D., Lauber, J., Lawson, I., Layter, J. G., Lellouch, D., Letts, J., Levinson, L., Liebisch, R., Lillich, J., List, B., Littlewood, C., Lloyd, A. W., Lloyd, S. L., Loebinger, F. K., Long, G. D., Losty, M. J., Lu, J., Ludwig, J., Liu, D., Macchiolo, A., Macpherson, A., Mader, W., Mannelli, M., Marcellini, S., Marchant, T. E., Martin, A. J., Martin, J. P., Martinez, G., Mashimo, T., Mättig, P., Mcdonald, W. J., Mckenna, J., Mckigney, E. A., Mcmahon, T. J., Mcpherson, R. A., Meijers, F., Mendez-Lorenzo, P., Merritt, F. S., Mes, H., Meyer, I., Michelini, A., Mihara, S., Mikenberg, G., Miller, D. J., Mohr, W., Montanari, A., Mori, T., Nagai, K., Nakamura, I., Neal, H. A., Nisius, R., O Neale, S. W., Oakham, F. G., Odorici, F., Ogren, H. O., Okpara, A., Oreglia, M. J., Orito, S., Pásztor, G., Pater, J. R., Patrick, G. N., Patt, J., Perez-Ochoa, R., Petzold, S., Pfeifenschneider, P., Pilcher, J. E., Pinfold, J., Plane, D. E., Poffenberger, P., Poli, B., Polok, J., Przybycień, M., Quadt, A., Rembser, C., Rick, H., Robertson, S., Robins, S. A., Rodning, N., Roney, J. M., Rosati, S., Roscoe, K., Rossi, A. M., Rozen, Y., Runge, K., Runolfsson, O., Rust, D. R., Sachs, K., Saeki, T., Sahr, O., Sang, W. M., Sarkisyan, E. K. G., Sbarra, C., Schaile, A. D., Schaile, O., Scharff-Hansen, P., Schieck, J., Schmitt, S., Schöning, A., Schröder, M., Schumacher, M., Schwick, C., Scott, W. G., Seuster, R., Shears, T. G., Shen, B. C., Shepherd-Themistocleous, C. H., Sherwood, P., Siroli, G. P., Skuja, A., Smith, A. M., Snow, G. A., Sobie, R., Söldner-Rembold, S., Spagnolo, S., Sproston, M., Stahl, A., Stephens, K., Stoll, K., Strom, D., Ströhmer, R., Surrow, B., Talbot, S. D., Taras, P., Tarem, S., Teuscher, R., Thiergen, M., Thomas, J., Thomson, M. A., Torrence, E., Towers, S., Trefzger, T., Trigger, I., Trócsányi, Z., Tsur, E., Turner-Watson, M. F., Ueda, I., Kooten, R., Vannerem, P., Verzocchi, M., Voss, H., Wäckerle, F., Wagner, A., Waller, D., Ward, C. P., Ward, D. R., Watkins, P. M., Watson, A. T., Watson, N. K., Wells, P. S., Wermes, N., Wetterling, D., White, J. S., Wilson, G. W., Wilson, J. A., Wyatt, T. R., Yamashita, S., Zacek, V., Zer-Zion, D., G., Abbiendi, K., Ackerstaff, G., Alexander, J., Allison, K. J., Anderson, S., Anderson, S., Arcelli, S., Asai, S. F., Ashby, D., Axen, G., Azuelo, A. H., Ball, E., Barberio, R. J., Barlow, J. R., Batley, S., Baumann, J., Bechtluft, T., Behnke, K. W., Bell, G., Bella, A., Bellerive, S., Bentvelsen, S., Bethke, S., Bett, O., Biebel, A., Biguzzi, I. J., Bloodworth, P., Bock, J., Bohme, O., Boeriu, D., Bonacorsi, M., Boutemeur, S., Braibant, P., Bright Thoma, L., Brigliadori, R. M., Brown, H. J., Burckhart, P., Capiluppi, R. K., Carnegie, A. A., Carter, J. R., Carter, C. Y., Chang, D. G., Charlton, D., Chrisman, C., Ciocca, P. E., L., E., Clay, I., Cohen, J. E., Conboy, O. C., Cooke, J., Couchman, C., Couyoumtzeli, R. L., Coxe, M., Cuffiani, S., Dado, G. M., Dallavalle, S., Dallison, R., Davi, S., De Jong, A., de Roeck, P., Dervan, K., Desch, B., Diene, M. S., Dixit, M., Donker, J., Dubbert, E., Duchovni, G., Duckeck, I. P., Duerdoth, P. G., Estabrook, E., Etzion, F., Fabbri, A., Fanfani, M., Fanti, A. A., Faust, L., Feld, P., Ferrari, F., Fiedler, M., Fierro, I., Fleck, A., Frey, A., Furtje, D. I., Futyan, P., Gagnon, J. W., Gary, G., Gaycken, C., Geich Gimbel, G., Giacomelli, P., Giacomelli, W. R., Gibson, D. M., Gingrich, D., Glenzinski, J., Goldberg, W., Gorn, C., Grandi, K., Graham, E., Gro, J., Grunhau, M., Gruwe, C., Hajdu, G. G., Hanson, M., Hansroul, M., Hapke, K., Harder, A., Harel, C. K., Hargrove, M., Harin Dirac, M., Hauschild, C. M., Hawke, R., Hawking, R. J., Hemingway, G., Herten, R. D., Heuer, M. D., Hildreth, J. C., Hill, P. R., Hobson, A., Hocker, K., Hoffman, R. J., Homer, A. K., Honma, D., Horvath, K. R., Hossain, R., Howard, P., Huntemeyer, P., Igo Kemene, D. C., Imrie, K., Ishii, F. R., Jacob, A., Jawahery, H., Jeremie, M., Jimack, C. R., Jone, P., Jovanovic, T. R., Junk, N., Kanaya, J., Kanzaki, D., Karlen, V., Kartvelishvili, K., Kawagoe, T., Kawamoto, P. I., Kayal, R. K., Keeler, R. G., Kellogg, B. W., Kennedy, D. H., Kim, A., Klier, T., Kobayashi, M., Kobel, T. P., Kokott, M., Kolrep, S., Komamiya, R. V., Kowalewski, T., Kre, P., Krieger, J., von Krogh, T., Kuhl, P., Kyberd, G. D., Lafferty, H., Landsman, D., Lanske, J., Lauber, I., Lawson, J. G., Layter, D., Lellouch, J., Lett, L., Levinson, R., Liebisch, J., Lillich, B., List, C., Littlewood, A. W., Lloyd, S. L., Lloyd, F. K., Loebinger, G. D., Long, M. J., Losty, J., Lu, J., Ludwig, D., Liu, A., Macchiolo, A., Macpherson, W., Mader, M., Mannelli, S., Marcellini, T. E., Marchant, A. J., Martin, J. P., Martin, G., Martinez, T., Mashimo, P., Mattig, W. J., Mcdonald, J., Mckenna, E. A., Mckigney, T. J., Mcmahon, R. A., Mcpherson, F., Meijer, P., Mendez Lorenzo, F. S., Merritt, H., Me, I., Meyer, A., Michelini, S., Mihara, G., Mikenberg, D. J., Miller, W., Mohr, A., Montanari, T., Mori, K., Nagai, I., Nakamura, H. A., Neal, R., Nisiu, S. W., O'Neale, F. G., Oakham, F., Odorici, H. O., Ogren, A., Okpara, M. J., Oreglia, S., Orito, G., Pasztor, J. R., Pater, G. N., Patrick, J., Patt, R., Perez Ochoa, S., Petzold, P., Pfeifenschneider, J. E., Pilcher, J., Pinfold, D. E., Plane, P., Poffenberger, B., Poli, J., Polok, M., Przybycien, A., Quadt, C., Rembser, H., Rick, S., Robertson, S. A., Robin, N., Rodning, J. M., Roney, S., Rosati, K., Roscoe, A. M., Rossi, Y., Rozen, K., Runge, O., Runolfsson, D. R., Rust, K., Sach, T., Saeki, O., Sahr, W. M., Sang, E. K., G., C., Sbarra, A. D., Schaile, O., Schaile, P., Scharff Hansen, J., Schieck, S., Schmitt, A., Schoning, M., Schroder, M., Schumacher, C., Schwick, W. G., Scott, R., Seuster, T. G., Shear, B. C., Shen, C. H., Shepherd Themistocleou, P., Sherwood, G. P., Siroli, A., Skuja, A. M., Smith, G. A., Snow, R., Sobie, S., Soldner Rembold, Spagnolo, Stefania Antonia, M., Sproston, A., Stahl, K., Stephen, K., Stoll, D., Strom, R., Strohmer, B., Surrow, S. D., Talbot, P., Tara, S., Tarem, R., Teuscher, M., Thiergen, J., Thoma, M. A., Thomson, E., Torrence, S., Tower, T., Trefzger, I., Trigger, Z., Trocsanyi, E., Tsur, M. F., Turner Watson, I., Ueda, R., Van Kooten, P., Vannerem, M., Verzocchi, H., Vo, F., Wackerle, A., Wagner, D., Waller, C. P., Ward, D. R., Ward, P. M., Watkin, A. T., Watson, N. K., Watson, P. S., Well, N., Werme, D., Wetterling, J. S., White, G. W., Wilson, J. A., Wilson, T. R., Wyatt, S., Yamashita, V., Zacek, and D., Zer Zion

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract

Cross-sections and angular distributions for hadronic and lepton pair final states in e+e- collisions at a centre-of-mass energy near 189 GeV, measured with the OPAL detector at LEP, are presented and compared with the predictions of the Standard Model. The results are used to measure the energy dependence of the electromagnetic coupling constant alpha_em, and to place limits on new physics as described by four-fermion contact interactions or by the exchange of a new heavy particle such as a sneutrino in supersymmetric theories with R-parity violation. A search for the indirect effects of the gravitational interaction in extra dimensions on the mu+mu- and tau+tau- final states is also presented. Cross-sections and angular distributions for hadronic and lepton pair final states in e+e- collisions at a centre-of-mass energy near 189 GeV, measured with the OPAL detector at LEP, are presented and compared with the predictions of the Standard Model. The results are used to measure the energy dependence of the electromagnetic coupling constant alpha_em, and to place limits on new physics as described by four-fermion contact interactions or by the exchange of a new heavy particle such as a sneutrino in supersymmetric theories with R-parity violation. A search for the indirect effects of the gravitational interaction in extra dimensions on the mu+mu- and tau+tau- final states is also presented. Cross-sections and angular distributions for hadronic and lepton pair final states in e+e- collisions at a centre-of-mass energy near 189 GeV, measured with the OPAL detector at LEP, are presented and compared with the predictions of the Standard Model. The results are used to measure the energy dependence of the electromagnetic coupling constant alpha_em, and to place limits on new physics as described by four-fermion contact interactions or by the exchange of a new heavy particle such as a sneutrino in supersymmetric theories with R-parity violation. A search for the indirect effects of the gravitational interaction in extra dimensions on the mu+mu- and tau+tau- final states is also presented.

452. Measurement of the production rate of charm quark pairs from gluons in hadronic Z0 decays

Author

Abbiendi, G., Ackerstaff, K., Alexander, G., Allison, John, Anderson, K. J., Anderson, S., Arcelli, S., Asai, S., Ashby, S. F., Axen, D., Azuelos, G., Ball, A. H., Barberio, E., Barlow, Roger J., Batley, J. R., Baumann, S., Bechtluft, J., Behnke, T., Bell, Kenneth Watson, Bella, G., Bellerive, A., Bentvelsen, S., Bethke, S., Betts, S., Biebel, O., Biguzzi, A., Bloodworth, I. J., Bock, P., Bohme, J., Boeriu, O., Bonacorsi, D., Boutemeur, M., Braibant, S., Bright-Thomas, P., Brigliadori, L., Brown, Robert M., Burckhart, H. J., Capiluppi, P., Carnegie, R. K., Carter, A. A., Carter, J. R., Chang, C. Y., Charlton, David G., Chrisman, D., Ciocca, C., Clarke, P. E. L., Clay, E., Cohen, I., Conboy, J. E., Cooke, O. C., Couchman, J., Couyoumtzelis, C., Coxe, R. L., Cuffiani, M., Dado, S., Dallavalle, G. Marco, Dallison, S., Davis, R., Jong, S., Roeck, A., Dervan, P., Desch, K., Dienes, B., Dixit, M. S., Donkers, M., Dubbert, J., Duchovni, E., Duckeck, G., Duerdoth, I. P., Estabrooks, P. G., Etzion, E., Fabbri, F., Fanfani, A., Fanti, M., Faust, A. A., Feld, L., Ferrari, P., Fiedler, F., Fierro, M., Fleck, I., Frey, A., Furtjes, A., Futyan, D. I., Gagnon, P., Gary, J. W., Gaycken, G., Geich-Gimbel, C., Giacomelli, G., Giacomelli, P., Gibson, W. R., Gingrich, D. M., Glenzinski, D., Goldberg, J., Gorn, W., Grandi, C., Graham, K., Gross, E., Grunhaus, J., Gruwe, M., Hajdu, C., Hanson, G. G., Hansroul, M., Hapke, M., Harder, K., Harel, A., Hargrove, C. K., Harin-Dirac, M., Michael Hauschild, Hawkes, C. M., Hawkings, R., Hemingway, R. J., Herten, G., Heuer, R. D., Hildreth, M. D., Hill, J. C., Hobson, P. R., Hocker, James Andrew, Hoffman, Kara Dion, Homer, R. J., Honma, A. K., Horvath, D., Hossain, K. R., Howard, R., Huntemeyer, P., Igo-Kemenes, P., Imrie, D. C., Ishii, K., Jacob, F. R., Jawahery, A., Jeremie, H., Jimack, M., Jones, C. R., Jovanovic, P., Junk, T. R., Kanaya, N., Kanzaki, J., Karlen, D., Kartvelishvili, V., Kawagoe, K., Kawamoto, T., Kayal, P. I., Keeler, R. K., Kellogg, R. G., Kennedy, B. W., Kim, D. H., Klier, A., Kobayashi, T., Kobel, M., Kokott, T. P., Kolrep, M., Komamiya, S., Kowalewski, Robert V., Kress, T., Krieger, P., Krogh, J., Kuhl, T., Kyberd, P., Lafferty, G. D., Landsman, H., Lanske, D., Lauber, J., Lawson, I., Layter, J. G., Lellouch, D., Letts, J., Levinson, L., Liebisch, R., Lillich, J., List, B., Littlewood, C., Lloyd, A. W., Lloyd, S. L., Loebinger, F. K., Long, G. D., Losty, M. J., Lu, J., Ludwig, J., Lui, D., Macchiolo, A., Macpherson, A., Mader, W., Mannelli, M., Marcellini, S., Marchant, T. E., Martin, A. J., Martin, J. P., Martinez, G., Mashimo, T., Mattig, Peter, Mcdonald, W. John, Mckenna, J., Mckigney, E. A., Mcmahon, T. J., Mcpherson, R. A., Meijers, F., Mendez-Lorenzo, P., Merritt, F. S., Mes, H., Meyer, I., Michelini, A., Mihara, S., Mikenberg, G., Miller, D. J., Mohr, W., Montanari, A., Mori, T., Nagai, K., Nakamura, I., Neal, H. A., Nisius, R., O Neale, S. W., Oakham, F. G., Odorici, F., Ogren, H. O., Okpara, A., Oreglia, M. J., Orito, S., Pasztor, G., Pater, J. R., Patrick, G. N., Patt, J., Perez-Ochoa, R., Petzold, S., Pfeifenschneider, P., Pilcher, J. E., Pinfold, J., Plane, David E., Poffenberger, P., Poli, B., Polok, J., Przybycien, M., Quadt, A., Rembser, C., Rick, H., Robertson, S., Robins, S. A., Rodning, N., Roney, J. M., Rosati, S., Roscoe, K., Rossi, A. M., Rozen, Y., Runge, K., Runolfsson, O., Rust, D. R., Sachs, K., Saeki, T., Sahr, O., Sang, W. M., Sarkisian, E. K. G., Sbarra, C., Schaile, A. D., Schaile, O., Scharff-Hansen, P., Schieck, J., Schmitt, S., Schoning, A., Schroder, Matthias, Schumacher, M., Schwick, C., Scott, W. G., Seuster, R., Shears, T. G., Shen, B. C., Shepherd-Themistocleous, C. H., Sherwood, P., Siroli, G. P., Skuja, A., Smith, A. M., Snow, G. A., Sobie, R., Soldner-Rembold, S., Spagnolo, S., Sproston, M., Stahl, A., Stephens, K., Stoll, K., Strom, David M., Strohmer, R., Surrow, B., Talbot, S. D., Taras, P., Tarem, S., Teuscher, R., Thiergen, M., Thomas, J., Thomson, M. A., Torrence, E., Towers, S., Trefzger, T., Trigger, I., Trocsanyi, Z., Tsur, E., Turner-Watson, M. F., Ueda, I., Kooten, Rick J., Vannerem, P., Verzocchi, M., Voss, H., Wackerle, F., Wagner, A., Waller, D., Ward, C. P., Ward, D. R., Watkins, P. M., Watson, A. T., Watson, N. K., Wells, P. S., Wermes, N., Wetterling, D., White, J. S., Wilson, G. W., Wilson, J. A., Wyatt, T. R., Yamashita, S., Zacek, V., Zer-Zion, D., G., Abbiendi, K., Ackerstaff, G., Alexander, J., Allison, K. J., Anderson, S., Anderson, S., Arcelli, S., Asai, S. F., Ashby, D., Axen, G., Azuelo, A. H., Ball, E., Barberio, R. J., Barlow, J. R., Batley, S., Baumann, J., Bechtluft, T., Behnke, K. W., Bell, G., Bella, A., Bellerive, S., Bentvelsen, S., Bethke, S., Bett, O., Biebel, A., Biguzzi, I. J., Bloodworth, P., Bock, J., Bohme, O., Boeriu, D., Bonacorsi, M., Boutemeur, S., Braibant, P., Bright Thoma, L., Brigliadori, R. M., Brown, H. J., Burckhart, P., Capiluppi, R. K., Carnegie, A. A., Carter, J. R., Carter, C. Y., Chang, D. G., Charlton, D., Chrisman, C., Ciocca, P. E., L., E., Clay, I., Cohen, J. E., Conboy, O. C., Cooke, J., Couchman, C., Couyoumtzeli, R. L., Coxe, M., Cuffiani, S., Dado, G. M., Dallavalle, S., Dallison, R., Davi, S., De Jong, A., de Roeck, P., Dervan, K., Desch, B., Diene, M. S., Dixit, M., Donker, J., Dubbert, E., Duchovni, G., Duckeck, I. P., Duerdoth, P. G., Estabrook, E., Etzion, F., Fabbri, A., Fanfani, M., Fanti, A. A., Faust, L., Feld, P., Ferrari, F., Fiedler, M., Fierro, I., Fleck, A., Frey, A., Furtje, D. I., Futyan, P., Gagnon, J. W., Gary, G., Gaycken, C., Geich Gimbel, G., Giacomelli, P., Giacomelli, W. R., Gibson, D. M., Gingrich, D., Glenzinski, J., Goldberg, W., Gorn, C., Grandi, K., Graham, E., Gro, J., Grunhau, M., Gruwe, C., Hajdu, G. G., Hanson, M., Hansroul, M., Hapke, K., Harder, A., Harel, C. K., Hargrove, M., Harin Dirac, M., Hauschild, C. M., Hawke, R., Hawking, R. J., Hemingway, G., Herten, R. D., Heuer, M. D., Hildreth, J. C., Hill, P. R., Hobson, A., Hocker, K., Hoffman, R. J., Homer, A. K., Honma, D., Horvath, K. R., Hossain, R., Howard, P., Huntemeyer, P., Igo Kemene, D. C., Imrie, K., Ishii, F. R., Jacob, A., Jawahery, H., Jeremie, M., Jimack, C. R., Jone, P., Jovanovic, T. R., Junk, N., Kanaya, J., Kanzaki, D., Karlen, V., Kartvelishvili, K., Kawagoe, T., Kawamoto, P. I., Kayal, R. K., Keeler, R. G., Kellogg, B. W., Kennedy, D. H., Kim, A., Klier, T., Kobayashi, M., Kobel, T. P., Kokott, M., Kolrep, S., Komamiya, R. V., Kowalewski, T., Kre, P., Krieger, J., von Krogh, T., Kuhl, P., Kyberd, G. D., Lafferty, H., Landsman, D., Lanske, J., Lauber, I., Lawson, J. G., Layter, D., Lellouch, J., Lett, L., Levinson, R., Liebisch, J., Lillich, B., List, C., Littlewood, A. W., Lloyd, S. L., Lloyd, F. K., Loebinger, G. D., Long, M. J., Losty, J., Lu, J., Ludwig, D., Liu, A., Macchiolo, A., Macpherson, W., Mader, M., Mannelli, S., Marcellini, T. E., Marchant, A. J., Martin, J. P., Martin, G., Martinez, T., Mashimo, P., Mattig, W. J., Mcdonald, J., Mckenna, E. A., Mckigney, T. J., Mcmahon, R. A., Mcpherson, F., Meijer, P., Mendez Lorenzo, F. S., Merritt, H., Me, I., Meyer, A., Michelini, S., Mihara, G., Mikenberg, D. J., Miller, W., Mohr, A., Montanari, T., Mori, K., Nagai, I., Nakamura, H. A., Neal, R., Nisiu, S. W., O'Neale, F. G., Oakham, F., Odorici, H. O., Ogren, A., Okpara, M. J., Oreglia, S., Orito, G., Pasztor, J. R., Pater, G. N., Patrick, J., Patt, R., Perez Ochoa, S., Petzold, P., Pfeifenschneider, J. E., Pilcher, J., Pinfold, D. E., Plane, P., Poffenberger, B., Poli, J., Polok, M., Przybycien, A., Quadt, C., Rembser, H., Rick, S., Robertson, S. A., Robin, N., Rodning, J. M., Roney, S., Rosati, K., Roscoe, A. M., Rossi, Y., Rozen, K., Runge, O., Runolfsson, D. R., Rust, K., Sach, T., Saeki, O., Sahr, W. M., Sang, E. K., G., C., Sbarra, A. D., Schaile, O., Schaile, P., Scharff Hansen, J., Schieck, S., Schmitt, A., Schoning, M., Schroder, M., Schumacher, C., Schwick, W. G., Scott, R., Seuster, T. G., Shear, B. C., Shen, C. H., Shepherd Themistocleou, P., Sherwood, G. P., Siroli, A., Skuja, A. M., Smith, G. A., Snow, R., Sobie, S., Soldner Rembold, Spagnolo, Stefania Antonia, M., Sproston, A., Stahl, K., Stephen, K., Stoll, D., Strom, R., Strohmer, B., Surrow, S. D., Talbot, P., Tara, S., Tarem, R., Teuscher, M., Thiergen, J., Thoma, M. A., Thomson, E., Torrence, S., Tower, T., Trefzger, I., Trigger, Z., Trocsanyi, E., Tsur, M. F., Turner Watson, I., Ueda, R., Van Kooten, P., Vannerem, M., Verzocchi, H., Vo, F., Wackerle, A., Wagner, D., Waller, C. P., Ward, D. R., Ward, P. M., Watkin, A. T., Watson, N. K., Watson, P. S., Well, N., Werme, D., Wetterling, J. S., White, G. W., Wilson, J. A., Wilson, T. R., Wyatt, S., Yamashita, V., Zacek, and D., Zer Zion

Subjects
High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment
Abstract

The rate of secondary charm-quark-pair production has been measured in 4.4 million hadronic Z0 decays collected by OPAL. By selecting events with three jets and tagging charmed hadrons in the gluon jet candidate using leptons and charged D* mesons, the average number of secondary charm-quark pairs per hadronic event is found to be (3.20+-0.21+-0.38)x10-2. The rate of secondary charm-quark-pair production has been measured in 4.4 million hadronic Z0 decays collected by OPAL. By selecting events with three jets and tagging charmed hadrons in the gluon jet candidate using leptons and charged D* mesons, the average number of secondary charm-quark pairs per hadronic event is found to be (3.20+-0.21+-0.38)x10-2.

453. Vaginal evisceration 3 years after abdominal hysterectomy and bilateral salpingo-oophorectomy.

Author

Orito S, Masuya N, Sakurabashi A, and Minoura S

Subjects
Female, Hernia, Herniorrhaphy, Humans, Middle Aged, Postmenopause, Visceral Prolapse surgery, Coitus, Hysterectomy adverse effects, Intestine, Small, Vagina injuries, Visceral Prolapse etiology
Abstract

Vaginal evisceration after a pelvic operation is a rare gynecological emergency. When intercourse is the cause, most cases occur within 1 year of surgery. A 53-year-old woman presented to the emergency room for vaginal evisceration half a day after the first postoperative occurrence of intercourse 3 years after an abdominal hysterectomy and bilateral salpingo-oophorectomy. In an emergency laparotomy, the protruding small bowel was replaced within the abdominal cavity. The avulsed vaginal cuff, which measured 6 cm in length and had atrophic but non-necrotic margins, was sutured. Women who go for long periods without intercourse after a hysterectomy, especially post-menopausal women, should be made aware of unrecognized vaginal atrophy that could, in some cases, lead to rupture and evisceration during the next occurrence of intercourse., (© 2012 The Authors. Journal of Obstetrics and Gynaecology Research © 2012 Japan Society of Obstetrics and Gynecology.)

Published
2012
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454. Search for charged Higgs bosons in e + e - collisions at [Formula: see text].

Author

Abbiendi G, Ainsley C, Åkesson PF, Alexander G, Anagnostou G, Anderson KJ, Asai S, Axen D, Bailey I, Barberio E, Barillari T, Barlow RJ, Batley RJ, Bechtle P, Behnke T, Bell KW, Bell PJ, Bella G, Bellerive A, Benelli G, Bethke S, Biebel O, Boeriu O, Bock P, Boutemeur M, Braibant S, Brown RM, Burckhart HJ, Campana S, Capiluppi P, Carnegie RK, Carter AA, Carter JR, Chang CY, Charlton DG, Ciocca C, Csilling A, Cuffiani M, Dado S, Dallavalle M, De Roeck A, De Wolf EA, Desch K, Dienes B, Dubbert J, Duchovni E, Duckeck G, Duerdoth IP, Etzion E, Fabbri F, Ferrari P, Fiedler F, Fleck I, Ford M, Frey A, Gagnon P, Gary JW, Geich-Gimbel C, Giacomelli G, Giacomelli P, Giunta M, Goldberg J, Gross E, Grunhaus J, Gruwé M, Gupta A, Hajdu C, Hamann M, Hanson GG, Harel A, Hauschild M, Hawkes CM, Hawkings R, Herten G, Heuer RD, Hill JC, Hoffman K, Horváth D, Igo-Kemenes P, Ishii K, Jeremie H, Jovanovic P, Junk TR, Kanzaki J, Karlen D, Kawagoe K, Kawamoto T, Keeler RK, Kellogg RG, Kennedy BW, Kluth S, Kobayashi T, Kobel M, Komamiya S, Krämer T, Krasznahorkay A Jr, Krieger P, von Krogh J, Kuhl T, Kupper M, Lafferty GD, Landsman H, Lanske D, Lellouch D, Letts J, Levinson L, Lillich J, Lloyd SL, Loebinger FK, Lu J, Ludwig A, Ludwig J, Mader W, Marcellini S, Marchant TE, Martin AJ, Mashimo T, Mättig P, McKenna J, McPherson RA, Meijers F, Menges W, Merritt FS, Mes H, Meyer N, Michelini A, Mihara S, Mikenberg G, Miller DJ, Mohr W, Mori T, Mutter A, Nagai K, Nakamura I, Nanjo H, Neal HA, O'Neale SW, Oh A, Okpara A, Oreglia MJ, Orito S, Pahl C, Pásztor G, Pater JR, Pilcher JE, Pinfold J, Plane DE, Pooth O, Przybycień M, Quadt A, Rabbertz K, Rembser C, Renkel P, Roney JM, Rossi AM, Rozen Y, Runge K, Sachs K, Saeki T, Sarkisyan EKG, Schaile AD, Schaile O, Scharff-Hansen P, Schieck J, Schörner-Sadenius T, Schröder M, Schumacher M, Seuster R, Shears TG, Shen BC, Sherwood P, Skuja A, Smith AM, Sobie R, Söldner-Rembold S, Spano F, Stahl A, Strom D, Ströhmer R, Tarem S, Tasevsky M, Teuscher R, Thomson MA, Torrence E, Toya D, Trigger I, Trócsányi Z, Tsur E, Turner-Watson MF, Ueda I, Ujvári B, Vollmer CF, Vannerem P, Vértesi R, Verzocchi M, Voss H, Vossebeld J, Ward CP, Ward DR, Watkins PM, Watson AT, Watson NK, Wells PS, Wengler T, Wermes N, Wilson GW, Wilson JA, Wolf G, Wyatt TR, Yamashita S, Zer-Zion D, and Zivkovic L

Abstract

A search is made for charged Higgs bosons predicted by Two-Higgs-Doublet extensions of the Standard Model (2HDM) using electron-positron collision data collected by the OPAL experiment at [Formula: see text], corresponding to an integrated luminosity of approximately 600 pb -1 . Charged Higgs bosons are assumed to be pair-produced and to decay into [Formula: see text], τν τ or AW ± . No signal is observed. Model-independent limits on the charged Higgs-boson production cross section are derived by combining these results with previous searches at lower energies. Under the assumption [Formula: see text], motivated by general 2HDM type II models, excluded areas on the [Formula: see text] plane are presented and charged Higgs bosons are excluded up to a mass of 76.3 GeV at 95 % confidence level, independent of the branching ratio BR(H ± → τν τ ). A scan of the 2HDM type I model parameter space is performed and limits on the Higgs-boson masses [Formula: see text] and m A are presented for different choices of tan β .

Published
2012
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455. Postpartum maternal pneumococcal meningitis complicated by endocarditis.

Author

Kakogawa J, Orito S, Masuya N, Sadatsuki M, Gomibuchi H, and Minoura S

Subjects
Adult, Endocarditis, Bacterial therapy, Female, Humans, Meningitis, Pneumococcal therapy, Puerperal Infection therapy, Endocarditis, Bacterial complications, Endocarditis, Bacterial diagnosis, Meningitis, Pneumococcal complications, Meningitis, Pneumococcal diagnosis, Puerperal Infection diagnosis, Puerperal Infection etiology
Abstract

Bacterial meningitis is associated with high morbidity and mortality. Few cases of pneumococcal meningitis during pregnancy and the postpartum period have been reported. We describe a case of postpartum pneumococcal meningitis complicated by endocarditis. A 26-year-old para-2 woman who had had a normal vaginal delivery at 38 weeks at a maternity home was transported to our hospital with a 39.5°C fever 11 days postpartum. Eight hours after her arrival, her state of consciousness deteriorated rapidly. Lumbar puncture revealed Gram-positive cocci consistent with Streptococcus pneumoniae. She was immediately treated with antibiotics and subsequently diagnosed with endocarditis. Final culture results from the blood and cerebrospinal fluid confirmed the presence of S. pneumoniae. She recovered completely with no evidence of neurological damage. Maintaining a high clinical suspicion and initiating appropriate diagnostic testing and therapeutic interventions promptly are essential to reducing the morbidity and mortality associated with bacterial meningitis., (© 2010 The Authors Acta Obstetricia et Gynecologica Scandinavica© 2010 Nordic Federation of Societies of Obstetrics and Gynecology.)

Published
2011
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456. Impact of dietary intake, education, and physical activity on bone mineral density among North Indian women.

Author

Kumar A, Mittal S, Orito S, Ishitani K, and Ohta H

Subjects
Absorptiometry, Photon, Adult, Aged, Body Mass Index, Calcium administration & dosage, Cross-Sectional Studies, Dietary Fats administration & dosage, Dietary Proteins administration & dosage, Educational Status, Energy Intake, Female, Humans, India, Middle Aged, Osteoporosis, Postmenopausal prevention & control, Statistics as Topic, Surveys and Questionnaires, Young Adult, Bone Density physiology, Diet, Motor Activity
Abstract

The aim of the study was to determine the relationship of dietary nutrients and bone mineral density (BMD) in North Indian women. This cross-sectional study was conducted from April 2006 to March 2008. Subjects included 255 healthy women, aged 20-69 years, who were relatives of patients being admitted in the hospital. Various demographic characteristics including socioeconomic status and serum parameters in relationship to BMD were evaluated. In addition, the daily dietary intake of energy, protein, fat, and calcium and the amount of physical activity were assessed. BMD at the lumbar spine, femoral neck, and Ward's triangle was measured by dual-energy X-ray absorptiometry (DXA). Body mass index (BMI), physical activity, and educational level were positively correlated with BMD. The daily intakes of energy (1563.4 +/- 267.2 kcal) and protein (48.7 +/- 8.7 g) were below the recommended dietary allowance. Daily dietary energy, protein, and calcium intakes were correlated with BMD at the lumbar spine. Stepwise multiple linear regression analyses showed that age, BMI, and physical activity were significant predictors for BMD at all sites. In addition, energy intake was also a predictor for BMD at the lumbar spine. The protein intake was associated with BMD at the spine (P = 0.02 and beta = 0.163) even after making adjustments for energy intake. Thus, dietary pattern coupled with higher education levels and greater physical activity favored bone health.

Published
2010
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457. Influence of maternal genetic and lifestyle factors on bone mineral density in adolescent daughters: a cohort study in 387 Japanese daughter-mother pairs.

Author

Kuroda T, Onoe Y, Miyabara Y, Yoshikata R, Orito S, Ishitani K, Okano H, and Ohta H

Subjects
Adolescent, Body Weight physiology, Child, Cohort Studies, Exercise physiology, Female, Humans, Japan, Lumbar Vertebrae physiology, Menarche physiology, Multivariate Analysis, Statistics, Nonparametric, Asian People, Bone Density genetics, Life Style, Mothers, Nuclear Family
Abstract

We conducted a cross-sectional study in a cohort of Japanese adolescent schoolgirls (12-18 years of age) and their mothers (387 pairs). Age, lumbar bone mineral density (BMD), birth and menarche-related status, height, body weight and lifestyles were surveyed in the participants. The values of BMD, height and body weight were converted to standard deviation (SD) by age. There were 49 (12.7%) pre-menarche and 338 (87.3%) post-menarche daughters. BMD-SD, height-SD, vitamin D intake and vitamin K intake were significantly correlated between the pre-menarche daughters and mothers (P < 0.05), while BMD-SD, birth weight, age at menarche and all lifestyle-related factors were significantly correlated between the post-menarche daughters and mothers (P < 0.05). BMD-SD in the pre-menarche daughters was affected by BMD-SD in mothers (R (2) = 0.069, P = 0.033) and their own height-SD (R (2) = 0.199, P = 0.001) (model R (2) = 0.340), independently. BMD-SD in the post-menarche daughters was affected by BMD-SD in mothers (R (2) = 0.073, P < 0.001) as well as by their own age at menarche (R (2) = 0.020, P = 0.001), height-SD (R (2) = 0.022, P < 0.001), body weight-SD (R (2) = 0.081, P < 0.001) and intensity of exercise (R (2) = 0.015, P = 0.045) (model R (2) = 0.372), independently. The results suggest that BMD is strongly correlated between daughters and mothers and that a greater age at menarche leads to lower peak bone mass. It was also suggested that maintaining high-intensity physical activity and adequate body weight is important in achieving maximum BMD as factors amenable to intervention in post-menarche daughters.

Published
2009
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458. Age-related distribution of bone and skeletal parameters in 1,322 Japanese young women.

Author

Orito S, Kuroda T, Onoe Y, Sato Y, and Ohta H

Subjects
Adolescent, Adult, Aging, Alkaline Phosphatase blood, Body Weight, Bone Density, Calcium blood, Child, Child, Preschool, Collagen Type I blood, Female, Hip, Humans, Lumbar Vertebrae pathology, Peptides blood, Phosphorus blood, Bone and Bones metabolism
Abstract

We explored factors that could serve as indices for therapeutic intervention aimed at prevention of osteoporosis. In this cross-sectional study, we investigated the timing of peak bone mass (PBM) in 1,322 Japanese women aged 12-30 years old. We measured height, body weight, bone mineral density (BMD), bone mineral content (BMC), and bone area at the lumbar spine and total hip, as well as the blood markers calcium, phosphorus, and the bone metabolic markers bone alkaline phosphatase (BAP) and type I collagen cross-linked N-telopeptide (NTX). All measurements were standardized with the mean at age 18 defined as 100% to identify age-related differences. In the total hip, BMD peaked at age 18, while, in the lumbar spine, BMD peaked at age 29, of which 99.8% was attained at age 18, suggesting that peak BMD was attained at age 18 at both the total hip and lumbar spine. No age difference was observed in serum calcium, while there was a 15.1% decrease between ages 12 and 18 in serum phosphorus. There were 273.8% and 208.5% decreases in serum BAP and NTX, respectively, between ages 12 and 18, while these levels remained constant thereafter, suggesting that bone and calcium metabolism are constant between ages 19 and 30. Factors that had stronger correlations with BMD, BMC, and bone area from 12 years to 18 years were height and body weight. PBM was reached at age 18. Control of body weight by using total hip BMD as an index for intervention should be reasonable.

Published
2009
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459. The impact of lifestyle factors on serum 25-hydroxyvitamin D levels: a cross-sectional study in Japanese women aged 19-25 years.

Author

Ohta H, Kuroda T, Onoe Y, Orito S, Ohara M, Kume M, Harada A, Tsugawa N, Okano T, and Sasaki S

Subjects
Adult, Bone Density, Calcium, Dietary metabolism, Cross-Sectional Studies, Exercise, Female, Humans, Japan, Lumbar Vertebrae metabolism, Regression Analysis, Sunlight, Vitamin D blood, Young Adult, Life Style, Vitamin D analogs & derivatives
Abstract

Insufficient levels of serum 25-hydroxyvitamin D [25(OH)D] lead to low bone mineral density (BMD) by increasing serum levels of intact parathyroid hormone (PTH), and are associated with a high mortality rate. Therefore, the 25(OH)D level is used as an indicator of frailty in older persons. To obtain higher serum 25(OH)D levels, management of lifestyle habits and nutrient intake is important beginning in a person's younger years. This study evaluated the degree of association between serum 25(OH)D concentrations and lifestyle factors in young Japanese women. A cohort study was conducted from December 2003, and the survey was finished by February 2004. The subjects were 274 Japanese women aged 19-25 years old. The parameters evaluated in these subjects included: (1) serum concentrations of 25(OH)D, intact PTH, calcium, and phosphorus; (2) BMD in the lumbar spine and hip; and (3) lifestyle factors (nutrient intake, physical activity, and duration of sunlight exposure). The serum 25(OH)D level was negatively associated with the intact PTH level (Spearman; r = -0.17, P = 0.006). The BMD was significantly higher in the high 25(OH)D and low intact PTH group than the other group (P < 0.05). The serum 25(OH)D level was significantly correlated with daily intake of dietary vitamin D (r = 0.20, P = 0.001), the mean number of steps taken per day (r = 0.16, P = 0.010) and the mean time spent in sedentary activity (r = -0.14, P = 0.018) among the lifestyle factors evaluated. Multiple regression analysis showed the degree of association between lifestyle factors and serum 25(OH)D to be small (R (2) = 0.084). Daily intake of dietary vitamin D and daily walking may be useful for increasing the serum 25(OH)D level in young Japanese women.

Published
2009
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460. Effects of water hardness and existence of adsorbent on toxic surface tension of surfactants for aquatic species.

Author

Oya M, Orito S, Ishikawa Y, and Iizuka T

Subjects
Adsorption, Animals, Crustacea drug effects, Oryzias, Soil, Surface Tension, Toxicity Tests, Minerals chemistry, Surface-Active Agents chemistry, Surface-Active Agents toxicity, Water chemistry
Abstract

We have studied the effectiveness of surface tension on surfactants risk assessment. gamma(tox) was defined as surface tension at a point where acute aquatic toxicity of a surfactant emerges. Oryzias latipes, Daphnia magna, and Podocopida were used for acute aquatic toxicity test of 7 surfactants and 3 detergents. Gamma(tox)values were plotted on surface tension curves, and the effect of water hardness on toxicity and surface tension were examined. Results showed that gamma(tox) varies greatly by kind of surfactant or detergent. Therefore, aquatic toxicity cannot only be explained by surface tension. The change of aquatic toxicity with varying water hardness, however, could be explained by the change of surface tension. Aquatic toxicity of LAS (Linear Alkylbenzene Sulphonate) increased and aquatic toxicity of SOAP decreased with an increase of water hardness, but both gamma(tox), values were constant. Aquatic toxicity was decreased by an addition of mud soil as adsorbent into surfactant solution. The toxicity change can be explained by the surface tension since gamma(tox) value of solution with and without mud soil were equal. These results showed that the change of aquatic toxicity of a surfactant caused by water property, such as water hardness, could be explained by the change of surface tension.

Published
2007
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461. Peripheral arterial thrombosis induced by chemotherapy in ovarian carcinoma coexisted with endometrial carcinoma.

Author

Hida K, Ikeda S, Shimizu S, Yoshikata R, Orito S, Tatsuduki A, and Ohta H

Subjects
Adenocarcinoma surgery, Carboplatin administration & dosage, Endometrial Neoplasms surgery, Fatal Outcome, Female, Humans, Middle Aged, Ovarian Neoplasms surgery, Paclitaxel administration & dosage, Postmenopause, Thrombocytopenia chemically induced, Thrombocytopenia complications, Adenocarcinoma drug therapy, Antineoplastic Combined Chemotherapy Protocols adverse effects, Endometrial Neoplasms drug therapy, Ovarian Neoplasms drug therapy, Peripheral Vascular Diseases chemically induced, Thrombosis chemically induced
Abstract

Introduction: Most patients with peripheral arterial occlusion have underlying atherosclerosis. Peripheral arterial thrombosis induced by chemotherapy in gynecological malignancies is rare., Case Report: A 60-year-old woman was diagnosed with ovarian carcinoma coexisting with endometrial carcinoma after surgical histopathological examination. Chemotherapy was started on postoperative day 11. On day 2 of chemotherapy, she developed bilateral lower extremity cyanosis. Thrombocytopenia due to chemotherapy was diagnosed and treated with repeated platelet transfusions. Anticoagulant therapy was also continued. However, the patient worsened steadily and died of liver dysfunction due to multiple liver metastases., Conclusion: Although arterial thrombosis induced by chemotherapy is rare, it is important for physicians to consider this possibility in the course of treatment with cytotoxic agents because this complication has serious health implications.

Published
2007
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462. Statistical analysis of washing efficiency for solid particle soil.

Author

Ishikawa Y, Orito S, and Oya M

Subjects
Adhesiveness, Alcohols chemistry, Ferric Compounds chemistry, Sodium Dodecyl Sulfate chemistry, Solubility, Oils chemistry, Soil, Surface-Active Agents chemistry
Abstract

In a previous study, statistical method using two distributions was applied to analyze detergency of oily soil. The method uses statistical distributions of detergent power and adhesive force of soil. In this paper, this method was applied to an analysis of detergency of solid particles. Soiled cotton cloth was prepared with red iron oxide dispersion liquid in Terg-O-Tometer. Four-time consecutive washings tests were conducted with dodecyl sulfuric acid sodium salt (SDS) and alcohol ethoxylate (AE) aqueous solutions in Terg-O-Tometer. Change of removal efficiencies due to repetitive washing was utilized to seek the two distributions. Predicted removal efficiencies calculated from computer simulation corresponded to experimental values. Different adhered states of soil, prepared by varying soiling conditions, were expressed as Removal Resistance. As soiling mechanical power increased, Removal Resistance shifted toward higher adhesive force of soil and an amount of soil had also increased. Iron oxide concentration only had an affect on an amount of soil. The results showed that the method using two statistical distributions can be applied to the detergency of solid particle.

Published
2007
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463. Search for cosmic-ray antideuterons.

Author

Fuke H, Maeno T, Abe K, Haino S, Makida Y, Matsuda S, Matsumoto H, Mitchell JW, Moiseev AA, Nishimura J, Nozaki M, Orito S, Ormes JF, Sasaki M, Seo ES, Shikaze Y, Streitmatter RE, Suzuki J, Tanaka K, Tanizaki K, Yamagami T, Yamamoto A, Yamamoto Y, Yamato K, Yoshida T, and Yoshimura K

Abstract

We performed a search for cosmic-ray antideuterons using data collected during four BESS balloon flights from 1997 to 2000. No candidate was found. We derived, for the first time, an upper limit of 1.9 x 10(-4) (m2s sr GeV/nucleon)(-1) for the differential flux of cosmic-ray antideuterons, at the 95% confidence level, between 0.17 and 1.15 GeV/nucleon at the top of the atmosphere.

Published
2005
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464. Measurements of cosmic-ray low-energy antiproton and proton spectra in a transient period of solar field reversal.

Author

Asaoka Y, Shikaze Y, Abe K, Anraku K, Fujikawa M, Fuke H, Haino S, Imori M, Izumi K, Maeno T, Makida Y, Matsuda S, Matsui N, Matsukawa T, Matsumoto H, Matsunaga H, Mitchell J, Mitsui T, Moiseev A, Motoki M, Nishimura J, Nozaki M, Orito S, Ormes JF, Saeki T, Sanuki T, Sasaki M, Seo ES, Sonoda T, Streitmatter R, Suzuki J, Tanaka K, Tanizaki K, Ueda I, Wang JZ, Yajima Y, Yamagami Y, Yamamoto A, Yamamoto Y, Yamato K, Yoshida T, and Yoshimura K

Abstract

The energy spectra of cosmic-ray low-energy antiprotons ( *p's) and protons ( p's) have been measured by BESS in 1999 and 2000, during a period covering reversal at the solar magnetic field. Based on these measurements, a sudden increase of the *p/p flux ratio following the solar magnetic field reversal was observed, and it generally agrees with a drift model of the solar modulation.

Published
2002
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465. Precision measurement of cosmic-Ray antiproton spectrum

Author

Orito S, Maeno T, Matsunaga H, Abe K, Anraku K, Asaoka Y, Fujikawa M, Imori M, Ishino M, Makida Y, Matsui N, Matsumoto H, Mitchell J, Mitsui T, Moiseev A, Motoki M, Nishimura J, Nozaki M, Ormes J, Saeki T, Sanuki T, Sasaki M, Seo ES, Shikaze Y, Sonoda T, and Streitmatter R

Abstract

The energy spectrum of cosmic-ray antiprotons ( &pmacr;'s) has been measured in the range 0.18-3.56 GeV, based on 458 &pmacr;'s collected by BESS in a recent solar-minimum period. We have detected for the first time a characteristic peak at 2 GeV of &pmacr;'s originating from cosmic-ray interactions with the interstellar gas. The peak spectrum is reproduced by theoretical calculations, implying that the propagation models are basically correct and that different cosmic-ray species undergo a universal propagation. Future BESS data with still higher statistics will allow us to study the solar modulation and the propagation in detail and to search for primary &pmacr; components.

Published
2000
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