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Measurement of the average polarization of b baryons in hadronic $Z^0$ decays
In the Standard Model, b quarks produced in e^+e^- annihilation at the Z^0 peak have a large average longitudinal polarization of -0.94. Some fraction of this polarization is expected to be transferred to b-flavored baryons during hadronization. The average longitudinal polarization of weakly decayi...
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Lenguaje: | eng |
Publicado: |
1998
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1016/S0370-2693(98)01387-2 http://cds.cern.ch/record/362079 |
_version_ | 1780892730666254336 |
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author | Abbiendi, G. Ackerstaff, K. Alexander, G. Allison, John Altekamp, N. Anderson, K.J. Anderson, S. Arcelli, S. Asai, S. Ashby, S.F. Axen, D. Azuelos, G. Ball, A.H. Barberio, E. Barlow, Roger J. Bartoldus, R. 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. Bird, S.D. Blobel, V. Bloodworth, I.J. Bobinski, M. Bock, P. Bohme, J. Bonacorsi, D. Boutemeur, M. Braibant, S. Bright-Thomas, P. Brigliadori, L. Brown, Robert M. Burckhart, H.J. Burgard, C. Burgin, R. 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. Couyoumtzelis, C. Coxe, R.L. Cuffiani, M. Dado, S. Dallavalle, G.Marco Davis, R. De Jong, S. del Pozo, L.A. De Roeck, A. Desch, K. Dienes, B. Dixit, M.S. Dubbert, J. Duchovni, E. Duckeck, G. Duerdoth, I.P. Eatough, D. Estabrooks, P.G. Etzion, E. Evans, H.G. Fabbri, F. Fanti, M. Faust, A.A. Fiedler, F. Fierro, M. Fleck, I. Folman, R. Furtjes, A. Futyan, D.I. Gagnon, P. Gary, J.W. Gascon, J. Gascon-Shotkin, S.M. Gaycken, G. Geich-Gimbel, C. Giacomelli, G. Giacomelli, P. Gibson, V. Gibson, W.R. Gingrich, D.M. Glenzinski, D. Goldberg, J. Gorn, W. Grandi, C. Gross, E. Grunhaus, J. Gruwe, M. Hanson, G.G. Hansroul, M. Hapke, M. Harder, K. Hargrove, C.K. Hartmann, C. Hauschild, M. Hawkes, C.M. Hawkings, R. Hemingway, R.J. Herndon, M. Herten, G. Heuer, R.D. Hildreth, M.D. Hill, J.C. Hillier, S.J. Hobson, P.R. Hocker, James Andrew 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. Karlen, D. Kartvelishvili, V. Kawagoe, K. Kawamoto, T. Kayal, P.I. Keeler, R.K. Kellogg, R.G. Kennedy, B.W. Klier, A. Kluth, S. Kobayashi, T. Kobel, M. Koetke, D.S. Kokott, T.P. Kolrep, M. Komamiya, S. Kowalewski, Robert V. Kress, T. Krieger, P. von Krogh, J. Kuhl, T. Kyberd, P. Lafferty, G.D. Lanske, D. Lauber, J. Lautenschlager, S.R. Lawson, I. Layter, J.G. Lazic, D. Lee, A.M. Lellouch, D. Letts, J. Levinson, L. Liebisch, R. List, B. Littlewood, C. Lloyd, A.W. Lloyd, S.L. Loebinger, F.K. Long, G.D. Losty, M.J. Ludwig, J. Lui, D. Macchiolo, A. Macpherson, A. Mader, W. Mannelli, M. Marcellini, S. Markopoulos, C. 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. Menke, S. Merritt, F.S. Mes, H. Meyer, J. Michelini, A. Mihara, S. Mikenberg, G. Miller, D.J. Mir, R. Mohr, W. Montanari, A. Mori, T. Nagai, K. Nakamura, I. Neal, H.A. Nellen, B. Nisius, R. O'Neale, S.W. Oakham, F.G. Odorici, F. Ogren, H.O. Oreglia, M.J. Orito, S. Palinkas, J. 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. Polok, J. Przybycien, M. Rembser, C. Rick, H. Robertson, S. Robins, S.A. Rodning, N. Roney, J.M. 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. Scharf, F. Scharff-Hansen, P. Schieck, J. Schmitt, B. 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. Sittler, A. Skuja, A. Smith, A.M. Snow, G.A. Sobie, R. Soldner-Rembold, S. Sproston, M. Stahl, A. Stephens, K. Steuerer, J. Stoll, K. Strom, David M. Strohmer, R. Surrow, B. Talbot, S.D. Tanaka, S. Taras, P. Tarem, S. Teuscher, R. Thiergen, M. Thomson, M.A. von Torne, E. Torrence, E. Towers, S. Trigger, I. Trocsanyi, Z. Tsur, E. Turcot, A.S. Turner-Watson, M.F. Van Kooten, Rick J. Vannerem, P. Verzocchi, M. Voss, H. Wackerle, F. Wagner, A. Ward, C.P. Ward, D.R. Watkins, P.M. Watson, A.T. Watson, N.K. Wells, P.S. Wermes, N. White, J.S. Wilson, G.W. Wilson, J.A. Wyatt, T.R. Yamashita, S. Yekutieli, G. Zacek, V. Zer-Zion, D. |
author_facet | Abbiendi, G. Ackerstaff, K. Alexander, G. Allison, John Altekamp, N. Anderson, K.J. Anderson, S. Arcelli, S. Asai, S. Ashby, S.F. Axen, D. Azuelos, G. Ball, A.H. Barberio, E. Barlow, Roger J. Bartoldus, R. 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. Bird, S.D. Blobel, V. Bloodworth, I.J. Bobinski, M. Bock, P. Bohme, J. Bonacorsi, D. Boutemeur, M. Braibant, S. Bright-Thomas, P. Brigliadori, L. Brown, Robert M. Burckhart, H.J. Burgard, C. Burgin, R. 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. Couyoumtzelis, C. Coxe, R.L. Cuffiani, M. Dado, S. Dallavalle, G.Marco Davis, R. De Jong, S. del Pozo, L.A. De Roeck, A. Desch, K. Dienes, B. Dixit, M.S. Dubbert, J. Duchovni, E. Duckeck, G. Duerdoth, I.P. Eatough, D. Estabrooks, P.G. Etzion, E. Evans, H.G. Fabbri, F. Fanti, M. Faust, A.A. Fiedler, F. Fierro, M. Fleck, I. Folman, R. Furtjes, A. Futyan, D.I. Gagnon, P. Gary, J.W. Gascon, J. Gascon-Shotkin, S.M. Gaycken, G. Geich-Gimbel, C. Giacomelli, G. Giacomelli, P. Gibson, V. Gibson, W.R. Gingrich, D.M. Glenzinski, D. Goldberg, J. Gorn, W. Grandi, C. Gross, E. Grunhaus, J. Gruwe, M. Hanson, G.G. Hansroul, M. Hapke, M. Harder, K. Hargrove, C.K. Hartmann, C. Hauschild, M. Hawkes, C.M. Hawkings, R. Hemingway, R.J. Herndon, M. Herten, G. Heuer, R.D. Hildreth, M.D. Hill, J.C. Hillier, S.J. Hobson, P.R. Hocker, James Andrew 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. Karlen, D. Kartvelishvili, V. Kawagoe, K. Kawamoto, T. Kayal, P.I. Keeler, R.K. Kellogg, R.G. Kennedy, B.W. Klier, A. Kluth, S. Kobayashi, T. Kobel, M. Koetke, D.S. Kokott, T.P. Kolrep, M. Komamiya, S. Kowalewski, Robert V. Kress, T. Krieger, P. von Krogh, J. Kuhl, T. Kyberd, P. Lafferty, G.D. Lanske, D. Lauber, J. Lautenschlager, S.R. Lawson, I. Layter, J.G. Lazic, D. Lee, A.M. Lellouch, D. Letts, J. Levinson, L. Liebisch, R. List, B. Littlewood, C. Lloyd, A.W. Lloyd, S.L. Loebinger, F.K. Long, G.D. Losty, M.J. Ludwig, J. Lui, D. Macchiolo, A. Macpherson, A. Mader, W. Mannelli, M. Marcellini, S. Markopoulos, C. 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. Menke, S. Merritt, F.S. Mes, H. Meyer, J. Michelini, A. Mihara, S. Mikenberg, G. Miller, D.J. Mir, R. Mohr, W. Montanari, A. Mori, T. Nagai, K. Nakamura, I. Neal, H.A. Nellen, B. Nisius, R. O'Neale, S.W. Oakham, F.G. Odorici, F. Ogren, H.O. Oreglia, M.J. Orito, S. Palinkas, J. 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. Polok, J. Przybycien, M. Rembser, C. Rick, H. Robertson, S. Robins, S.A. Rodning, N. Roney, J.M. 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. Scharf, F. Scharff-Hansen, P. Schieck, J. Schmitt, B. 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. Sittler, A. Skuja, A. Smith, A.M. Snow, G.A. Sobie, R. Soldner-Rembold, S. Sproston, M. Stahl, A. Stephens, K. Steuerer, J. Stoll, K. Strom, David M. Strohmer, R. Surrow, B. Talbot, S.D. Tanaka, S. Taras, P. Tarem, S. Teuscher, R. Thiergen, M. Thomson, M.A. von Torne, E. Torrence, E. Towers, S. Trigger, I. Trocsanyi, Z. Tsur, E. Turcot, A.S. Turner-Watson, M.F. Van Kooten, Rick J. Vannerem, P. Verzocchi, M. Voss, H. Wackerle, F. Wagner, A. Ward, C.P. Ward, D.R. Watkins, P.M. Watson, A.T. Watson, N.K. Wells, P.S. Wermes, N. White, J.S. Wilson, G.W. Wilson, J.A. Wyatt, T.R. Yamashita, S. Yekutieli, G. Zacek, V. Zer-Zion, D. |
author_sort | Abbiendi, G. |
collection | CERN |
description | In the Standard Model, b quarks produced in e^+e^- annihilation at the Z^0 peak have a large average longitudinal polarization of -0.94. Some fraction of this polarization is expected to be transferred to b-flavored baryons during hadronization. The average longitudinal polarization of weakly decaying b baryons, <P_L^{\Lambda_b}>, is measured in approximately 4.3 million hadronic Z^0 decays collected with the OPAL detector between 1990 and 1995 at LEP. Those b baryons that decay semileptonically and produce a \Lambda baryon are identified through the correlation of the baryon number of the \Lambda and the electric charge of the lepton. In this semileptonic decay, the ratio of the neutrino energy to the lepton energy is a sensitive polarization observable. The neutrino energy is estimated using missing energy measurements. From a fit to the distribution of this ratio, the value <P_L^{\Lambda_b}> = -0.56^{+0.20}_{-0.13} +/- 0.09 is obtained, where the first error is statistical and the second systematic. |
id | cern-362079 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 1998 |
record_format | invenio |
spelling | cern-3620792023-03-12T06:02:21Zdoi:10.1016/S0370-2693(98)01387-2http://cds.cern.ch/record/362079engAbbiendi, G.Ackerstaff, K.Alexander, G.Allison, JohnAltekamp, N.Anderson, K.J.Anderson, S.Arcelli, S.Asai, S.Ashby, S.F.Axen, D.Azuelos, G.Ball, A.H.Barberio, E.Barlow, Roger J.Bartoldus, R.Batley, J.R.Baumann, S.Bechtluft, J.Behnke, T.Bell, Kenneth WatsonBella, G.Bellerive, A.Bentvelsen, S.Bethke, S.Betts, S.Biebel, O.Biguzzi, A.Bird, S.D.Blobel, V.Bloodworth, I.J.Bobinski, M.Bock, P.Bohme, J.Bonacorsi, D.Boutemeur, M.Braibant, S.Bright-Thomas, P.Brigliadori, L.Brown, Robert M.Burckhart, H.J.Burgard, C.Burgin, R.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.Couyoumtzelis, C.Coxe, R.L.Cuffiani, M.Dado, S.Dallavalle, G.MarcoDavis, R.De Jong, S.del Pozo, L.A.De Roeck, A.Desch, K.Dienes, B.Dixit, M.S.Dubbert, J.Duchovni, E.Duckeck, G.Duerdoth, I.P.Eatough, D.Estabrooks, P.G.Etzion, E.Evans, H.G.Fabbri, F.Fanti, M.Faust, A.A.Fiedler, F.Fierro, M.Fleck, I.Folman, R.Furtjes, A.Futyan, D.I.Gagnon, P.Gary, J.W.Gascon, J.Gascon-Shotkin, S.M.Gaycken, G.Geich-Gimbel, C.Giacomelli, G.Giacomelli, P.Gibson, V.Gibson, W.R.Gingrich, D.M.Glenzinski, D.Goldberg, J.Gorn, W.Grandi, C.Gross, E.Grunhaus, J.Gruwe, M.Hanson, G.G.Hansroul, M.Hapke, M.Harder, K.Hargrove, C.K.Hartmann, C.Hauschild, M.Hawkes, C.M.Hawkings, R.Hemingway, R.J.Herndon, M.Herten, G.Heuer, R.D.Hildreth, M.D.Hill, J.C.Hillier, S.J.Hobson, P.R.Hocker, James AndrewHomer, 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.Karlen, D.Kartvelishvili, V.Kawagoe, K.Kawamoto, T.Kayal, P.I.Keeler, R.K.Kellogg, R.G.Kennedy, B.W.Klier, A.Kluth, S.Kobayashi, T.Kobel, M.Koetke, D.S.Kokott, T.P.Kolrep, M.Komamiya, S.Kowalewski, Robert V.Kress, T.Krieger, P.von Krogh, J.Kuhl, T.Kyberd, P.Lafferty, G.D.Lanske, D.Lauber, J.Lautenschlager, S.R.Lawson, I.Layter, J.G.Lazic, D.Lee, A.M.Lellouch, D.Letts, J.Levinson, L.Liebisch, R.List, B.Littlewood, C.Lloyd, A.W.Lloyd, S.L.Loebinger, F.K.Long, G.D.Losty, M.J.Ludwig, J.Lui, D.Macchiolo, A.Macpherson, A.Mader, W.Mannelli, M.Marcellini, S.Markopoulos, C.Martin, A.J.Martin, J.P.Martinez, G.Mashimo, T.Mattig, PeterMcDonald, W.JohnMcKenna, J.Mckigney, E.A.McMahon, T.J.McPherson, R.A.Meijers, F.Menke, S.Merritt, F.S.Mes, H.Meyer, J.Michelini, A.Mihara, S.Mikenberg, G.Miller, D.J.Mir, R.Mohr, W.Montanari, A.Mori, T.Nagai, K.Nakamura, I.Neal, H.A.Nellen, B.Nisius, R.O'Neale, S.W.Oakham, F.G.Odorici, F.Ogren, H.O.Oreglia, M.J.Orito, S.Palinkas, J.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.Polok, J.Przybycien, M.Rembser, C.Rick, H.Robertson, S.Robins, S.A.Rodning, N.Roney, J.M.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.Scharf, F.Scharff-Hansen, P.Schieck, J.Schmitt, B.Schmitt, S.Schoning, A.Schroder, MatthiasSchumacher, M.Schwick, C.Scott, W.G.Seuster, R.Shears, T.G.Shen, B.C.Shepherd-Themistocleous, C.H.Sherwood, P.Siroli, G.P.Sittler, A.Skuja, A.Smith, A.M.Snow, G.A.Sobie, R.Soldner-Rembold, S.Sproston, M.Stahl, A.Stephens, K.Steuerer, J.Stoll, K.Strom, David M.Strohmer, R.Surrow, B.Talbot, S.D.Tanaka, S.Taras, P.Tarem, S.Teuscher, R.Thiergen, M.Thomson, M.A.von Torne, E.Torrence, E.Towers, S.Trigger, I.Trocsanyi, Z.Tsur, E.Turcot, A.S.Turner-Watson, M.F.Van Kooten, Rick J.Vannerem, P.Verzocchi, M.Voss, H.Wackerle, F.Wagner, A.Ward, C.P.Ward, D.R.Watkins, P.M.Watson, A.T.Watson, N.K.Wells, P.S.Wermes, N.White, J.S.Wilson, G.W.Wilson, J.A.Wyatt, T.R.Yamashita, S.Yekutieli, G.Zacek, V.Zer-Zion, D.Measurement of the average polarization of b baryons in hadronic $Z^0$ decaysParticle Physics - ExperimentIn the Standard Model, b quarks produced in e^+e^- annihilation at the Z^0 peak have a large average longitudinal polarization of -0.94. Some fraction of this polarization is expected to be transferred to b-flavored baryons during hadronization. The average longitudinal polarization of weakly decaying b baryons, <P_L^{\Lambda_b}>, is measured in approximately 4.3 million hadronic Z^0 decays collected with the OPAL detector between 1990 and 1995 at LEP. Those b baryons that decay semileptonically and produce a \Lambda baryon are identified through the correlation of the baryon number of the \Lambda and the electric charge of the lepton. In this semileptonic decay, the ratio of the neutrino energy to the lepton energy is a sensitive polarization observable. The neutrino energy is estimated using missing energy measurements. From a fit to the distribution of this ratio, the value <P_L^{\Lambda_b}> = -0.56^{+0.20}_{-0.13} +/- 0.09 is obtained, where the first error is statistical and the second systematic.In the Standard Model, b quarks produced in e^+e^- annihilation at the Z^0 peak have a large average longitudinal polarization of -0.94. Some fraction of this polarization is expected to be transferred to b-flavored baryons during hadronization. The average longitudinal polarization of weakly decaying b baryons, <P_L^{\Lambda_b}>, is measured in approximately 4.3 million hadronic Z^0 decays collected with the OPAL detector between 1990 and 1995 at LEP. Those b baryons that decay semileptonically and produce a \Lambda baryon are identified through the correlation of the baryon number of the \Lambda and the electric charge of the lepton. In this semileptonic decay, the ratio of the neutrino energy to the lepton energy is a sensitive polarization observable. The neutrino energy is estimated using missing energy measurements. From a fit to the distribution of this ratio, the value <P_L^{\Lambda_b}> = -0.56^{+0.20}_{-0.13} +/- 0.09 is obtained, where the first error is statistical and the second systematic.In the Standard Model, b quarks produced in e^+e^- annihilation at the Z^0 peak have a large average longitudinal polarization of -0.94. Some fraction of this polarization is expected to be transferred to b-flavored baryons during hadronization. The average longitudinal polarization of weakly decaying b baryons, <P_L^{\Lambda_b}>, is measured in approximately 4.3 million hadronic Z^0 decays collected with the OPAL detector between 1990 and 1995 at LEP. Those b baryons that decay semileptonically and produce a \Lambda baryon are identified through the correlation of the baryon number of the \Lambda and the electric charge of the lepton. In this semileptonic decay, the ratio of the neutrino energy to the lepton energy is a sensitive polarization observable. The neutrino energy is estimated using missing energy measurements. From a fit to the distribution of this ratio, the value <P_L^{\Lambda_b}> = -0.56^{+0.20}_{-0.13} +/- 0.09 is obtained, where the first error is statistical and the second systematic.In the Standard Model, b quarks produced in e^+e^- annihilation at the Z^0 peak have a large average longitudinal polarization of -0.94. Some fraction of this polarization is expected to be transferred to b-flavored baryons during hadronization. The average longitudinal polarization of weakly decaying b baryons, <P_L^{\Lambda_b}>, is measured in approximately 4.3 million hadronic Z^0 decays collected with the OPAL detector between 1990 and 1995 at LEP. Those b baryons that decay semileptonically and produce a \Lambda baryon are identified through the correlation of the baryon number of the \Lambda and the electric charge of the lepton. In this semileptonic decay, the ratio of the neutrino energy to the lepton energy is a sensitive polarization observable. The neutrino energy is estimated using missing energy measurements. From a fit to the distribution of this ratio, the value <P_L^{\Lambda_b}> = -0.56^{+0.20}_{-0.13} +/- 0.09 is obtained, where the first error is statistical and the second systematic.In the Standard Model, b quarks produced in e^+e^- annihilation at the Z^0 peak have a large average longitudinal polarization of -0.94. Some fraction of this polarization is expected to be transferred to b-flavored baryons during hadronization. The average longitudinal polarization of weakly decaying b baryons, <P_L^{\Lambda_b}>, is measured in approximately 4.3 million hadronic Z^0 decays collected with the OPAL detector between 1990 and 1995 at LEP. Those b baryons that decay semileptonically and produce a \Lambda baryon are identified through the correlation of the baryon number of the \Lambda and the electric charge of the lepton. In this semileptonic decay, the ratio of the neutrino energy to the lepton energy is a sensitive polarization observable. The neutrino energy is estimated using missing energy measurements. From a fit to the distribution of this ratio, the value <P_L^{\Lambda_b}> = -0.56^{+0.20}_{-0.13} +/- 0.09 is obtained, where the first error is statistical and the second systematic.In the Standard Model, b quarks produced in e^+e^- annihilation at the Z^0 peak have a large average longitudinal polarization of -0.94. Some fraction of this polarization is expected to be transferred to b-flavored baryons during hadronization. The average longitudinal polarization of weakly decaying b baryons, <P_L^{\Lambda_b}>, is measured in approximately 4.3 million hadronic Z^0 decays collected with the OPAL detector between 1990 and 1995 at LEP. Those b baryons that decay semileptonically and produce a \Lambda baryon are identified through the correlation of the baryon number of the \Lambda and the electric charge of the lepton. In this semileptonic decay, the ratio of the neutrino energy to the lepton energy is a sensitive polarization observable. The neutrino energy is estimated using missing energy measurements. From a fit to the distribution of this ratio, the value <P_L^{\Lambda_b}> = -0.56^{+0.20}_{-0.13} +/- 0.09 is obtained, where the first error is statistical and the second systematic.In the Standard Model, b quarks produced in e^+e^- annihilation at the Z^0 peak have a large average longitudinal polarization of -0.94. Some fraction of this polarization is expected to be transferred to b-flavored baryons during hadronization. The average longitudinal polarization of weakly decaying b baryons, <P_L^{\Lambda_b}>, is measured in approximately 4.3 million hadronic Z^0 decays collected with the OPAL detector between 1990 and 1995 at LEP. Those b baryons that decay semileptonically and produce a \Lambda baryon are identified through the correlation of the baryon number of the \Lambda and the electric charge of the lepton. In this semileptonic decay, the ratio of the neutrino energy to the lepton energy is a sensitive polarization observable. The neutrino energy is estimated using missing energy measurements. From a fit to the distribution of this ratio, the value <P_L^{\Lambda_b}> = -0.56^{+0.20}_{-0.13} +/- 0.09 is obtained, where the first error is statistical and the second systematic.In the Standard Model, b quarks produced in e^+e^- annihilation at the Z^0 peak have a large average longitudinal polarization of -0.94. Some fraction of this polarization is expected to be transferred to b-flavored baryons during hadronization. The average longitudinal polarization of weakly decaying b baryons, <P_L^{\Lambda_b}>, is measured in approximately 4.3 million hadronic Z^0 decays collected with the OPAL detector between 1990 and 1995 at LEP. Those b baryons that decay semileptonically and produce a \Lambda baryon are identified through the correlation of the baryon number of the \Lambda and the electric charge of the lepton. In this semileptonic decay, the ratio of the neutrino energy to the lepton energy is a sensitive polarization observable. The neutrino energy is estimated using missing energy measurements. From a fit to the distribution of this ratio, the value <P_L^{\Lambda_b}> = -0.56^{+0.20}_{-0.13} +/- 0.09 is obtained, where the first error is statistical and the second systematic.In the Standard Model, b quarks produced in e^+e^- annihilation at the Z^0 peak have a large average longitudinal polarization of -0.94. Some fraction of this polarization is expected to be transferred to b-flavored baryons during hadronization. The average longitudinal polarization of weakly decaying b baryons, <P_L^{\Lambda_b}>, is measured in approximately 4.3 million hadronic Z^0 decays collected with the OPAL detector between 1990 and 1995 at LEP. Those b baryons that decay semileptonically and produce a \Lambda baryon are identified through the correlation of the baryon number of the \Lambda and the electric charge of the lepton. In this semileptonic decay, the ratio of the neutrino energy to the lepton energy is a sensitive polarization observable. The neutrino energy is estimated using missing energy measurements. From a fit to the distribution of this ratio, the value <P_L^{\Lambda_b}> = -0.56^{+0.20}_{-0.13} +/- 0.09 is obtained, where the first error is statistical and the second systematic.In the Standard Model, b quarks produced in e + e − annihilation at the Z 0 peak have a large average longitudinal polarization of −0.94. Some fraction of this polarization is expected to be transferred to b-flavored baryons during hadronization. The average longitudinal polarization of weakly decaying b baryons, 〈 P L Λ b 〉, is measured in approximately 4.3 million hadronic Z 0 decays collected with the OPAL detector between 1990 and 1995 at LEP. Those b baryons that decay semileptonically and produce a Λ baryon are identified through the correlation of the baryon number of the Λ and the electric charge of the lepton. In this semileptonic decay, the ratio of the neutrino energy to the lepton energy is a sensitive polarization observable. The neutrino energy is estimated using missing energy measurements. From a fit to the distribution of this ratio, the value 〈 P L Λ b 〉=−0.56 +0.20 −0.13 ±0.09 is obtained, where the first error is statistical and the second systematic.hep-ex/9808006CERN-EP-98-119CERN-EP-98-119oai:cds.cern.ch:3620791998-07-20 |
spellingShingle | Particle Physics - Experiment Abbiendi, G. Ackerstaff, K. Alexander, G. Allison, John Altekamp, N. Anderson, K.J. Anderson, S. Arcelli, S. Asai, S. Ashby, S.F. Axen, D. Azuelos, G. Ball, A.H. Barberio, E. Barlow, Roger J. Bartoldus, R. 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. Bird, S.D. Blobel, V. Bloodworth, I.J. Bobinski, M. Bock, P. Bohme, J. Bonacorsi, D. Boutemeur, M. Braibant, S. Bright-Thomas, P. Brigliadori, L. Brown, Robert M. Burckhart, H.J. Burgard, C. Burgin, R. 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. Couyoumtzelis, C. Coxe, R.L. Cuffiani, M. Dado, S. Dallavalle, G.Marco Davis, R. De Jong, S. del Pozo, L.A. De Roeck, A. Desch, K. Dienes, B. Dixit, M.S. Dubbert, J. Duchovni, E. Duckeck, G. Duerdoth, I.P. Eatough, D. Estabrooks, P.G. Etzion, E. Evans, H.G. Fabbri, F. Fanti, M. Faust, A.A. Fiedler, F. Fierro, M. Fleck, I. Folman, R. Furtjes, A. Futyan, D.I. Gagnon, P. Gary, J.W. Gascon, J. Gascon-Shotkin, S.M. Gaycken, G. Geich-Gimbel, C. Giacomelli, G. Giacomelli, P. Gibson, V. Gibson, W.R. Gingrich, D.M. Glenzinski, D. Goldberg, J. Gorn, W. Grandi, C. Gross, E. Grunhaus, J. Gruwe, M. Hanson, G.G. Hansroul, M. Hapke, M. Harder, K. Hargrove, C.K. Hartmann, C. Hauschild, M. Hawkes, C.M. Hawkings, R. Hemingway, R.J. Herndon, M. Herten, G. Heuer, R.D. Hildreth, M.D. Hill, J.C. Hillier, S.J. Hobson, P.R. Hocker, James Andrew 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. Karlen, D. Kartvelishvili, V. Kawagoe, K. Kawamoto, T. Kayal, P.I. Keeler, R.K. Kellogg, R.G. Kennedy, B.W. Klier, A. Kluth, S. Kobayashi, T. Kobel, M. Koetke, D.S. Kokott, T.P. Kolrep, M. Komamiya, S. Kowalewski, Robert V. Kress, T. Krieger, P. von Krogh, J. Kuhl, T. Kyberd, P. Lafferty, G.D. Lanske, D. Lauber, J. Lautenschlager, S.R. Lawson, I. Layter, J.G. Lazic, D. Lee, A.M. Lellouch, D. Letts, J. Levinson, L. Liebisch, R. List, B. Littlewood, C. Lloyd, A.W. Lloyd, S.L. Loebinger, F.K. Long, G.D. Losty, M.J. Ludwig, J. Lui, D. Macchiolo, A. Macpherson, A. Mader, W. Mannelli, M. Marcellini, S. Markopoulos, C. 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. Menke, S. Merritt, F.S. Mes, H. Meyer, J. Michelini, A. Mihara, S. Mikenberg, G. Miller, D.J. Mir, R. Mohr, W. Montanari, A. Mori, T. Nagai, K. Nakamura, I. Neal, H.A. Nellen, B. Nisius, R. O'Neale, S.W. Oakham, F.G. Odorici, F. Ogren, H.O. Oreglia, M.J. Orito, S. Palinkas, J. 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. Polok, J. Przybycien, M. Rembser, C. Rick, H. Robertson, S. Robins, S.A. Rodning, N. Roney, J.M. 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. Scharf, F. Scharff-Hansen, P. Schieck, J. Schmitt, B. 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. Sittler, A. Skuja, A. Smith, A.M. Snow, G.A. Sobie, R. Soldner-Rembold, S. Sproston, M. Stahl, A. Stephens, K. Steuerer, J. Stoll, K. Strom, David M. Strohmer, R. Surrow, B. Talbot, S.D. Tanaka, S. Taras, P. Tarem, S. Teuscher, R. Thiergen, M. Thomson, M.A. von Torne, E. Torrence, E. Towers, S. Trigger, I. Trocsanyi, Z. Tsur, E. Turcot, A.S. Turner-Watson, M.F. Van Kooten, Rick J. Vannerem, P. Verzocchi, M. Voss, H. Wackerle, F. Wagner, A. Ward, C.P. Ward, D.R. Watkins, P.M. Watson, A.T. Watson, N.K. Wells, P.S. Wermes, N. White, J.S. Wilson, G.W. Wilson, J.A. Wyatt, T.R. Yamashita, S. Yekutieli, G. Zacek, V. Zer-Zion, D. Measurement of the average polarization of b baryons in hadronic $Z^0$ decays |
title | Measurement of the average polarization of b baryons in hadronic $Z^0$ decays |
title_full | Measurement of the average polarization of b baryons in hadronic $Z^0$ decays |
title_fullStr | Measurement of the average polarization of b baryons in hadronic $Z^0$ decays |
title_full_unstemmed | Measurement of the average polarization of b baryons in hadronic $Z^0$ decays |
title_short | Measurement of the average polarization of b baryons in hadronic $Z^0$ decays |
title_sort | measurement of the average polarization of b baryons in hadronic $z^0$ decays |
topic | Particle Physics - Experiment |
url | https://dx.doi.org/10.1016/S0370-2693(98)01387-2 http://cds.cern.ch/record/362079 |
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measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT montanaria measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT morit measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT nagaik measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT nakamurai measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT nealha measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT nellenb measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT nisiusr measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT onealesw measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT oakhamfg measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT odoricif measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT ogrenho measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT oregliamj measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT oritos 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polokj measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT przybycienm measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT rembserc measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT rickh measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT robertsons measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT robinssa measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT rodningn measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT roneyjm measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT roscoek measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT rossiam measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT rozeny measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT rungek measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT runolfssono measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT rustdr measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT sachsk measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT saekit measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT sahro measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT sangwm measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT sarkisianekg measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT sbarrac measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT schailead measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT schaileo measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT scharff measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT scharffhansenp measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT schieckj measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT schmittb measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT schmitts measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT schoninga measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT schrodermatthias measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT schumacherm measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT schwickc measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT scottwg measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT seusterr measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT shearstg measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT shenbc measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT shepherdthemistocleousch measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT sherwoodp measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT siroligp measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT sittlera measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT skujaa measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT smitham measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT snowga measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT sobier measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT soldnerrembolds measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT sprostonm measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT stahla measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT stephensk measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT steuererj measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT stollk measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT stromdavidm measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT strohmerr measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT surrowb measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT talbotsd measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT tanakas measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT tarasp measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT tarems measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT teuscherr measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT thiergenm measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT thomsonma measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT vontornee measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT torrencee measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT towerss measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT triggeri measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT trocsanyiz measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT tsure measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT turcotas measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT turnerwatsonmf measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT vankootenrickj measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT vanneremp measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT verzocchim measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT vossh measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT wackerlef measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT wagnera measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT wardcp measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT warddr measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT watkinspm measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT watsonat measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT watsonnk measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT wellsps measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT wermesn measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT whitejs measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT wilsongw measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT wilsonja measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT wyatttr measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT yamashitas measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT yekutielig measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT zacekv measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays AT zerziond measurementoftheaveragepolarizationofbbaryonsinhadronicz0decays |