Measurement of Longitudinal Spin Transfer to Lambda Hyperons in Deep Inelastic Lepton Scattering
| Popis: | Spin transfer in deep-inelastic Lambda electroproduction has been studied with the HERMES detector using the 27.6 GeV polarized positron beam in the HERA storage ring. For an average fractional energy transfer = 0.45, the longitudinal spin transfer from the virtual photon to the Lambda has been extracted. The spin transfer along the Lambda momentum direction is found to be 0.11 +/- 0.17 (stat) +/- 0.03 (sys); similar values are found for other possible choices for the longitudinal spin direction of the Lambda. This result is the most precise value obtained to date from deep-inelastic scattering with charged lepton beams, and is sensitive to polarized up quark fragmentation to hyperon states. The experimental result is found to be in general agreement with various models of the Lambda spin content, and is consistent with the assumption of helicity conservation in the fragmentation process. Comment: 8 pages, 3 figures; new version has an expanded discussion and small format changes |
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| Popis souboru: | application/pdf |
| Jazyk: | English |
| ISSN: | 1550-2368 1550-7998 0556-2821 |
| DOI: | 10.1103/PhysRevD.64.112005 |
| Přístupová URL adresa: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f22d42c10bdfcf879bfa320d2b6a1962 https://doi.org/10.1103/PhysRevD.64.112005 |
| Rights: | OPEN |
| Přírůstkové číslo: | edsair.doi.dedup.....f22d42c10bdfcf879bfa320d2b6a1962 |
| Autor: | Th. Benisch, H. E. Jackson, V. G. Krivokhijine, A. Nagaitsev, S. Bernreuther, T. A. Shibata, Haiyan Gao, C. Baumgarten, M. Amarian, B. Braun, Michel Vetterli, F. Menden, S. Brauksiepe, Andrey V. Izotov, R.O. Avakian, Evaristo Cisbani, G. Rakness, E. Devitsin, V. A. Kozlov, W.-D. Nowak, N. Akopov, A. Metz, Ralf Kaiser, M. Guidal, A. Reali, Valeria Muccifora, A.O. Mateos, B. D. Fox, A. R. Reolon, A. Avetissian, W. Lachnit, A. Airapetian, G. S. Kyle, V. A. Korotkov, M. Iodice, E. Steffens, M. Henoch, A. Kisselev, A. Borissov, Robert Henderson, M. Kurisuno, M. Sutter, G. M. Urciuoli, A. Simon, G. Gavrilov, M. Düren, R. D. McKeown, P. Geiger, R. J. Holt, G. P. Capitani, J. van Hunen, Klaus Rith, M. Kolstein, M. Ruh, Adel Terkulov, F. Masoli, J. Visser, A. Dvoredsky, L. G. Greeniaus, S. Yoneyama, R. Mussa, Wolfgang Lorenzon, B. Tipton, F. Neunreither, P. Carter, R. Openshaw, B. R. Owen, E. De Sanctis, C. Scarlett, H. Schmitt, H. Avakian, Y. Gärber, U. Stosslein, Y. Holler, Michael Tytgat, S. Taroian, P. Rossi, Salvatore Frullani, E. E. W. Bruins, A. Fechtchenko, B. Bray, Franco Garibaldi, P. F. Dalpiaz, K. Königsmann, R. P. Redwine, E. Thomas, Michael Pitt, A. Brüll, C. A. Miller, G. Schnell, W. Wander, J. Ely, A. Jgoun, G. Elbakian, A. Gute, W. Brückner, S. E. Williamson, S. Belostotski, P.K.A. de Witt Huberts, P. Kitching, Ross Milner, H. Kolster, O. Grebeniouk, S. I. Manaenkov, Alessandra Fantoni, T. Shin, M. Nupieri, G. van der Steenhoven, G. Graw, A. Golendukhin, H. J. Bulten, Alan M. Nathan, F.H. Heinsius, P. Chumney, E. C. Aschenauer, E. R. Kinney, V. Shutov, V. Vikhrov, B. Bains, L. H. Kramer, Wolfgang Korsch, Y. Naryshkin, C. Simani, Naomi C R Makins, F. Meissner, V. Gyurjyan, Manuella Vincter, M.-A. Funk, E. Volk, Ralf Hertenberger, H. Ihssen, J. P. Haas, A. Schwind, Hiroaki Kobayashi, K. Fiedler, K. Shibatani, K. Woller, M. Spengos, J. Franz, K. McIlhany, I.A. Savin, P.W. Green, G.R. Court, M. McAndrew, H. Tallini, J. W. Martin, S. Rudnitsky, Dirk Ryckbosch, Thomas O'Neill, K. P. Schüler, N. Koch, Nicola Bianchi, O. Mikloukho, S. Potashov, H. Zohrabian, M. Kirsch, P. Di Nezza, M. A. Miller, C. Grosshauser, R. A. Ristinen, J. M. Niczyporuk, N. Meyners, J.-O. Hansen, M. Ferstl, M. Bouwhuis, H. Böttcher, S. F. Pate, V. Papavassiliou, R. Van de Vyver, P. Slavich, Jeffrey Brack, J. Stenger, J. E. Belz, J. Stewart, W. Haeberli, P. Lenisa, J. Seibert, J. Wendland, D. Hasch, B. W. Filippone, J. Blouw, D. H. Potterveld, W. Hoprich, H. Fischer, O. Häusser, D. De Schepper, K. Sinram, T. Wise, V. Gharibyan, F. Schmidt, M. Beckmann, J. F. J. van den Brand, Yasuhiro Sakemi, Jinsong Ouyang, M. Hartig, S. Brons, F. K. Martens |
| Přispěvatelé: | (Astro)-Particles Physics |
| Jazyk: | angličtina |
| Rok vydání: | 2001 |
| Předmět: |
Photon
HERMES (p pi-) [mass spectrum] PROTON 01 natural sciences polarization [up] High Energy Physics - Experiment High Energy Physics - Experiment (hep-ex) 27.5 GeV angular distribution deep inelastic scattering [positron p] STRUCTURE-FUNCTION G(1)(P) NUCLEON Nuclear Experiment Physics BARYONS Spin polarization HERA Helicity DESY HERA Stor polarization [Lambda] Lambda --> p pi Quark fragmentation [up] Nuclear and High Energy Physics Particle physics electroproduction [Lambda] MUON SCATTERING FOS: Physical sciences Nuclear physics ASYMMETRIES 0103 physical sciences ddc:530 SDG 7 - Affordable and Clean Energy 010306 general physics Z-DECAYS quark model parton 010308 nuclear & particles physics Hyperon (LAMBDA)OVER-BAR POLARIZATION Deep inelastic scattering conservation law [helicity] DEUTERON High Energy Physics::Experiment polarized beam [positron] positron p --> Lambda POLARIZED QUARK DISTRIBUTIONS Lepton experimental results |
| Zdroj: | Physical review / D 64(11), 112005 (2001). doi:10.1103/PhysRevD.64.112005 Physical Review D, 64(11):112005. American Physical Society Physical Review D, 64. American Physical Society Scopus-Elsevier Airapetian, A, van den Brand, J F J, Bulten, H J & Simani, M C 2001, ' Measurement of Longitudinal Spin Transfer to Lambda Hyperons in Deep Inelastic Lepton Scattering. ', Physical Review D, vol. 64, pp. 112005 . https://doi.org/10.1103/PhysRevD.64.112005 Airapetian, A, Akopov, N, Amarian, M, Aschenauer, E C, Avakian, H, Avakian, R, Avetissian, A, Bains, B, Baumgarten, C, Beckmann, M, Belostotski, S, Belz, J E, Benisch, T, Bernreuther, S, Bianchi, N, Blouw, J, Böttcher, H, Borissov, A, Bouwhuis, M, Brack, J, Brauksiepe, S, Braun, B, Bray, B, Brons, S, Brückner, W, Brüll, A, Bruins, E E W, Bulten, H J, Capitani, G P, Carter, P, Chumney, P, Cisbani, E, Court, G R, Dalpiaz, P F, De Sanctis, E, De Schepper, D, Devitsin, E, De Witt Huberts, P K A, Di Nezza, P, Düren, M, Dvoredsky, A, Elbakian, G, Ely, J, Fantoni, A, Fechtchenko, A, Ferstl, M, Fiedler, K, Filippone, B W, Fischer, H, Fox, B, Franz, J, Frullani, S, Funk, M A, Gärber, Y, Gao, H, Garibaldi, F, Gavrilov, G, Geiger, P, Gharibyan, V, Golendukhin, A, Graw, G, Grebeniouk, O, Green, P W, Greeniaus, L G, Grosshauser, C, Guidal, M, Gute, A, Gyurjyan, V, Haas, J P, Haeberli, W, Hausser, O, Hansen, J O, Hartig, M, Hasch, D, Heinsius, F H, Henderson, R, Henoch, M, Hertenberger, R, Holler, Y, Holt, R J, Hoprich, W, Ihssen, H, Iodice, M, Izotov, A, Jackson, H E, Jgoun, A, Kaiser, R, Kinney, E, Kirsch, M, Kisselev, A, Kitching, P, Kobayashi, H, Koch, N, Königsmann, K, Kolstein, M, Kolster, H, Korotkov, V, Korsch, W, Kozlov, V, Kramer, L H, Krivokhijine, V G, Kurisuno, M, Kyle, G, Lachnit, W, Lenisa, P, Lorenzon, W, Makins, N C R, Manaenkov, S I, Martens, F K, Martin, J W, Masoli, F, Mateos, A, McAndrew, M, McIlhany, K, McKeown, R D, Meissner, F, Menden, F, Metz, A, Meyners, N, Mikloukho, O, Miller, C A, Miller, M A, Milner, R, Most, A, Muccifora, V, Mussa, R, Nagaitsev, A, Naryshkin, Y, Nathan, A M, Neunreither, F, Niczyporuk, J M, Nowak, W D, Nupieri, M, O'Neill, T G, Openshaw, R, Ouyang, J, Owen, B R, Papavassiliou, V, Pate, S F, Pitt, M, Potashov, S, Potterveld, D H, Rakness, G, Reali, A, Redwine, R, Reolon, A R, Ristinen, R, Rith, K, Rossi, P, Rudnitsky, S, Ruh, M, Ryckbosch, D, Sakemi, Y, Savin, I, Scarlett, C, Schmidt, F, Schmitt, H, Schnell, G, Schüler, K P, Schwind, A, Seibert, J, Shibata, T A, Shibatani, K, Shin, T, Shutov, V, Simani, C, Simon, A, Sinram, K, Slavich, P, Spengos, M, Steffens, E, Stenger, J, Stewart, J, Stösslein, U, Sutter, M, Tallini, H, Taroian, S, Terkulov, A, Thomas, E, Tipton, B, Tytgat, M, Urciuoli, G M, Van Den Brand, J F J, Van Der Steenhoven, G, Van De Vyver, R, Van Hunen, J J, Vetterli, M C, Vikhrov, V, Vincter, M G, Visser, J, Volk, E, Wander, W, Wendland, J, Williamson, S E, Wise, T, Woller, K, Yoneyama, S & Zohrabian, H 2001, ' Measurement of longitudinal spin transfer to Λ hyperons in deep-inelastic lepton scattering ', Physical Review D, vol. 64, no. 11, 112005 . https://doi.org/10.1103/PhysRevD.64.112005 |
| ISSN: | 1550-2368 1550-7998 0556-2821 |
| DOI: | 10.1103/PhysRevD.64.112005 |
| Popis: | Spin transfer in deep-inelastic Lambda electroproduction has been studied with the HERMES detector using the 27.6 GeV polarized positron beam in the HERA storage ring. For an average fractional energy transfer = 0.45, the longitudinal spin transfer from the virtual photon to the Lambda has been extracted. The spin transfer along the Lambda momentum direction is found to be 0.11 +/- 0.17 (stat) +/- 0.03 (sys); similar values are found for other possible choices for the longitudinal spin direction of the Lambda. This result is the most precise value obtained to date from deep-inelastic scattering with charged lepton beams, and is sensitive to polarized up quark fragmentation to hyperon states. The experimental result is found to be in general agreement with various models of the Lambda spin content, and is consistent with the assumption of helicity conservation in the fragmentation process. Comment: 8 pages, 3 figures; new version has an expanded discussion and small format changes |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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