Measurement of longitudinal spin transfer to Λ hyperons in deep-inelastic lepton scattering

A. Airapetian; N. Akopov; M. Amarian; E. C. Aschenauer; H. Avakian; R. Avakian; A. Avetissian; B. Bains; C. Baumgarten; M. Beckmann; S. Belostotski; J. E. Belz; Th Benisch; S. Bernreuther; N. Bianchi; J. Blouw; H. Böttcher; A. Borissov; M. Bouwhuis; J. Brack; S. Brauksiepe; B. Braun; B. Bray; S. Brons; W. Brückner; A. Brüll; E. E.W. Bruins; H. J. Bulten; G. P. Capitani; P. Carter; P. Chumney; E. Cisbani; G. R. Court; P. F. Dalpiaz; E. De Sanctis; D. De Schepper; E. Devitsin; P. K.A. De Witt Huberts; P. Di Nezza; M. Düren; A. Dvoredsky; G. Elbakian; J. Ely; A. Fantoni; A. Fechtchenko; M. Ferstl; K. Fiedler; B. W. Filippone; H. Fischer; B. Fox; J. Franz; S. Frullani; M. A. Funk; Y. Gärber; H. Gao; F. Garibaldi; G. Gavrilov; P. Geiger; V. Gharibyan; A. Golendukhin; G. Graw; O. Grebeniouk; P. W. Green; L. G. Greeniaus; C. Grosshauser; M. Guidal; A. Gute; V. Gyurjyan; J. P. Haas; W. Haeberli; O. Hausser; J. O. Hansen; M. Hartig; D. Hasch; F. H. Heinsius; R. Henderson; M. Henoch; R. Hertenberger; Y. Holler; R. J. Holt; W. Hoprich; H. Ihssen; M. Iodice; A. Izotov; H. E. Jackson; A. Jgoun; R. Kaiser; E. Kinney; M. Kirsch; A. Kisselev; P. Kitching; H. Kobayashi; N. Koch; K. Königsmann; M. Kolstein; H. Kolster; V. Korotkov; W. Korsch; V. Kozlov; L. H. Kramer; V. G. Krivokhijine; M. Kurisuno; G. Kyle; W. Lachnit; P. Lenisa; W. Lorenzon; N. C.R. Makins; S. I. Manaenkov; F. K. Martens; J. W. Martin; F. Masoli; A. Mateos; M. McAndrew; K. McIlhany; R. D. McKeown; F. Meissner; F. Menden; A. Metz; N. Meyners; O. Mikloukho; C. A. Miller; M. A. Miller; R. Milner; A. Most; V. Muccifora; R. Mussa; A. Nagaitsev; Y. Naryshkin; A. M. Nathan; F. Neunreither; J. M. Niczyporuk; W. D. Nowak; M. Nupieri; T. G. O'Neill; R. Openshaw; J. Ouyang; B. R. Owen; V. Papavassiliou; S. F. Pate; M. Pitt; S. Potashov; D. H. Potterveld; G. Rakness; A. Reali; R. Redwine; A. R. Reolon; R. Ristinen; K. Rith; P. Rossi; S. Rudnitsky; M. Ruh; D. Ryckbosch; Yasuhiro Sakemi; I. Savin; C. Scarlett; F. Schmidt; H. Schmitt; G. Schnell; K. P. Schüler; A. Schwind; J. Seibert; T. A. Shibata; K. Shibatani; T. Shin; V. Shutov; C. Simani; A. Simon; K. Sinram; P. Slavich; M. Spengos; E. Steffens; J. Stenger; J. Stewart; U. Stösslein; M. Sutter; H. Tallini; S. Taroian; A. Terkulov; E. Thomas; B. Tipton; M. Tytgat; G. M. Urciuoli; J. F.J. Van Den Brand; G. Van Der Steenhoven; R. Van De Vyver; J. J. Van Hunen; M. C. Vetterli; V. Vikhrov; M. G. Vincter; J. Visser; E. Volk; W. Wander; J. Wendland; S. E. Williamson; T. Wise; K. Woller; S. Yoneyama; H. Zohrabian

Measurement of longitudinal spin transfer to Λ hyperons in deep-inelastic lepton scattering

A. Airapetian, N. Akopov, M. Amarian, E. C. Aschenauer, H. Avakian, R. Avakian, A. Avetissian, B. Bains, C. Baumgarten, M. Beckmann, S. Belostotski, J. E. Belz, Th Benisch, S. Bernreuther, N. Bianchi, J. Blouw, H. Böttcher, A. Borissov, M. Bouwhuis, J. BrackS. Brauksiepe, B. Braun, B. Bray, S. Brons, W. Brückner, A. Brüll, E. E.W. Bruins, H. J. Bulten, G. P. Capitani, P. Carter, P. Chumney, E. Cisbani, G. R. Court, P. F. Dalpiaz, E. De Sanctis, D. De Schepper, E. Devitsin, P. K.A. De Witt Huberts, P. Di Nezza, M. Düren, A. Dvoredsky, G. Elbakian, J. Ely, A. Fantoni, A. Fechtchenko, M. Ferstl, K. Fiedler, B. W. Filippone, H. Fischer, B. Fox, J. Franz, S. Frullani, M. A. Funk, Y. Gärber, H. Gao, F. Garibaldi, G. Gavrilov, P. Geiger, V. Gharibyan, A. Golendukhin, G. Graw, O. Grebeniouk, P. W. Green, L. G. Greeniaus, C. Grosshauser, M. Guidal, A. Gute, V. Gyurjyan, J. P. Haas, W. Haeberli, O. Hausser, J. O. Hansen, M. Hartig, D. Hasch, F. H. Heinsius, R. Henderson, M. Henoch, R. Hertenberger, Y. Holler, R. J. Holt, W. Hoprich, H. Ihssen, M. Iodice, A. Izotov, H. E. Jackson, A. Jgoun, R. Kaiser, E. Kinney, M. Kirsch, A. Kisselev, P. Kitching, H. Kobayashi, N. Koch, K. Königsmann, M. Kolstein, H. Kolster, V. Korotkov, W. Korsch, V. Kozlov, L. H. Kramer, V. G. Krivokhijine, M. Kurisuno, G. Kyle, W. Lachnit, P. Lenisa, W. Lorenzon, N. C.R. Makins, S. I. Manaenkov, F. K. Martens, J. W. Martin, F. Masoli, A. Mateos, M. McAndrew, K. McIlhany, R. D. McKeown, F. Meissner, F. Menden, A. Metz, N. Meyners, O. Mikloukho, C. A. Miller, M. A. Miller, R. Milner, A. Most, V. Muccifora, R. Mussa, A. Nagaitsev, Y. Naryshkin, A. M. Nathan, F. Neunreither, J. M. Niczyporuk, W. D. Nowak, M. Nupieri, T. G. O'Neill, R. Openshaw, J. Ouyang, B. R. Owen, V. Papavassiliou, S. F. Pate, M. Pitt, S. Potashov, D. H. Potterveld, G. Rakness, A. Reali, R. Redwine, A. R. Reolon, R. Ristinen, K. Rith, P. Rossi, S. Rudnitsky, M. Ruh, D. Ryckbosch, Yasuhiro Sakemi, I. Savin, C. Scarlett, F. Schmidt, H. Schmitt, G. Schnell, K. P. Schüler, A. Schwind, J. Seibert, T. A. Shibata, K. Shibatani, T. Shin, V. Shutov, C. Simani, A. Simon, K. Sinram, P. Slavich, M. Spengos, E. Steffens, J. Stenger, J. Stewart, U. Stösslein, M. Sutter, H. Tallini, S. Taroian, A. Terkulov, E. Thomas, B. Tipton, M. Tytgat, G. M. Urciuoli, J. F.J. Van Den Brand, G. Van Der Steenhoven, R. Van De Vyver, J. J. Van Hunen, M. C. Vetterli, V. Vikhrov, M. G. Vincter, J. Visser, E. Volk, W. Wander, J. Wendland, S. E. Williamson, T. Wise, K. Woller, S. Yoneyama, H. Zohrabian

Cyclotron and Radioisotope Center (CYRIC)

Research output: Contribution to journal › Article

49 Citations (Scopus)

Abstract

Spin transfer in deep-inelastic Λ electroproduction has been studied with the HERMES detector using the 27.6 GeV polarized positron beam in the DESY HERA storage ring. For an average fractional energy transfer 〈z〉 = 0.45, the longitudinal spin transfer from the virtual photon to the Λ has been extracted. The spin transfer along the Λ momentum direction is found to be 0.11±0.17(stat)±0.03(syst); similar values are found for other possible choices for the longitudinal spin direction of the Λ. 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 Λ spin content, and is consistent with the assumption of helicity conservation in the fragmentation process.

Original language	English
Article number	112005
Journal	Physical Review D
Volume	64
Issue number	11
Publication status	Published - 2001 Dec 1

ASJC Scopus subject areas

Nuclear and High Energy Physics
Physics and Astronomy (miscellaneous)

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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., ... Zohrabian, H. (2001). Measurement of longitudinal spin transfer to Λ hyperons in deep-inelastic lepton scattering. Physical Review D, 64(11), [112005].

Measurement of longitudinal spin transfer to Λ hyperons in deep-inelastic lepton scattering. / 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, Th; 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, Yasuhiro; 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.

In: Physical Review D, Vol. 64, No. 11, 112005, 01.12.2001.

Research output: Contribution to journal › Article

Airapetian, A, Akopov, N, Amarian, M, Aschenauer, EC, Avakian, H, Avakian, R, Avetissian, A, Bains, B, Baumgarten, C, Beckmann, M, Belostotski, S, Belz, JE, 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, EEW, Bulten, HJ, Capitani, GP, Carter, P, Chumney, P, Cisbani, E, Court, GR, Dalpiaz, PF, De Sanctis, E, De Schepper, D, Devitsin, E, De Witt Huberts, PKA, Di Nezza, P, Düren, M, Dvoredsky, A, Elbakian, G, Ely, J, Fantoni, A, Fechtchenko, A, Ferstl, M, Fiedler, K, Filippone, BW, Fischer, H, Fox, B, Franz, J, Frullani, S, Funk, MA, Gärber, Y, Gao, H, Garibaldi, F, Gavrilov, G, Geiger, P, Gharibyan, V, Golendukhin, A, Graw, G, Grebeniouk, O, Green, PW, Greeniaus, LG, Grosshauser, C, Guidal, M, Gute, A, Gyurjyan, V, Haas, JP, Haeberli, W, Hausser, O, Hansen, JO, Hartig, M, Hasch, D, Heinsius, FH, Henderson, R, Henoch, M, Hertenberger, R, Holler, Y, Holt, RJ, Hoprich, W, Ihssen, H, Iodice, M, Izotov, A, Jackson, HE, 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, LH, Krivokhijine, VG, Kurisuno, M, Kyle, G, Lachnit, W, Lenisa, P, Lorenzon, W, Makins, NCR, Manaenkov, SI, Martens, FK, Martin, JW, Masoli, F, Mateos, A, McAndrew, M, McIlhany, K, McKeown, RD, Meissner, F, Menden, F, Metz, A, Meyners, N, Mikloukho, O, Miller, CA, Miller, MA, Milner, R, Most, A, Muccifora, V, Mussa, R, Nagaitsev, A, Naryshkin, Y, Nathan, AM, Neunreither, F, Niczyporuk, JM, Nowak, WD, Nupieri, M, O'Neill, TG, Openshaw, R, Ouyang, J, Owen, BR, Papavassiliou, V, Pate, SF, Pitt, M, Potashov, S, Potterveld, DH, Rakness, G, Reali, A, Redwine, R, Reolon, AR, 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, KP, Schwind, A, Seibert, J, Shibata, TA, 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, GM, Van Den Brand, JFJ, Van Der Steenhoven, G, Van De Vyver, R, Van Hunen, JJ, Vetterli, MC, Vikhrov, V, Vincter, MG, Visser, J, Volk, E, Wander, W, Wendland, J, Williamson, SE, 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.

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, Th ; 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, Yasuhiro ; 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. / Measurement of longitudinal spin transfer to Λ hyperons in deep-inelastic lepton scattering. In: Physical Review D. 2001 ; Vol. 64, No. 11.

@article{5aa86526ae724c11be4936584ef37c66,

title = "Measurement of longitudinal spin transfer to Λ hyperons in deep-inelastic lepton scattering",

abstract = "Spin transfer in deep-inelastic Λ electroproduction has been studied with the HERMES detector using the 27.6 GeV polarized positron beam in the DESY HERA storage ring. For an average fractional energy transfer 〈z〉 = 0.45, the longitudinal spin transfer from the virtual photon to the Λ has been extracted. The spin transfer along the Λ momentum direction is found to be 0.11±0.17(stat)±0.03(syst); similar values are found for other possible choices for the longitudinal spin direction of the Λ. 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 Λ spin content, and is consistent with the assumption of helicity conservation in the fragmentation process.",

author = "A. Airapetian and N. Akopov and M. Amarian and Aschenauer, {E. C.} and H. Avakian and R. Avakian and A. Avetissian and B. Bains and C. Baumgarten and M. Beckmann and S. Belostotski and Belz, {J. E.} and Th Benisch and S. Bernreuther and N. Bianchi and J. Blouw and H. B{\"o}ttcher and A. Borissov and M. Bouwhuis and J. Brack and S. Brauksiepe and B. Braun and B. Bray and S. Brons and W. Br{\"u}ckner and A. Br{\"u}ll and Bruins, {E. E.W.} and Bulten, {H. J.} and Capitani, {G. P.} and P. Carter and P. Chumney and E. Cisbani and Court, {G. R.} and Dalpiaz, {P. F.} and {De Sanctis}, E. and {De Schepper}, D. and E. Devitsin and {De Witt Huberts}, {P. K.A.} and {Di Nezza}, P. and M. D{\"u}ren and A. Dvoredsky and G. Elbakian and J. Ely and A. Fantoni and A. Fechtchenko and M. Ferstl and K. Fiedler and Filippone, {B. W.} and H. Fischer and B. Fox and J. Franz and S. Frullani and Funk, {M. A.} and Y. G{\"a}rber and H. Gao and F. Garibaldi and G. Gavrilov and P. Geiger and V. Gharibyan and A. Golendukhin and G. Graw and O. Grebeniouk and Green, {P. W.} and Greeniaus, {L. G.} and C. Grosshauser and M. Guidal and A. Gute and V. Gyurjyan and Haas, {J. P.} and W. Haeberli and O. Hausser and Hansen, {J. O.} and M. Hartig and D. Hasch and Heinsius, {F. H.} and R. Henderson and M. Henoch and R. Hertenberger and Y. Holler and Holt, {R. J.} and W. Hoprich and H. Ihssen and M. Iodice and A. Izotov and Jackson, {H. E.} and A. Jgoun and R. Kaiser and E. Kinney and M. Kirsch and A. Kisselev and P. Kitching and H. Kobayashi and N. Koch and K. K{\"o}nigsmann and M. Kolstein and H. Kolster and V. Korotkov and W. Korsch and V. Kozlov and Kramer, {L. H.} and Krivokhijine, {V. G.} and M. Kurisuno and G. Kyle and W. Lachnit and P. Lenisa and W. Lorenzon and Makins, {N. C.R.} and Manaenkov, {S. I.} and Martens, {F. K.} and Martin, {J. W.} and F. Masoli and A. Mateos and M. McAndrew and K. McIlhany and McKeown, {R. D.} and F. Meissner and F. Menden and A. Metz and N. Meyners and O. Mikloukho and Miller, {C. A.} and Miller, {M. A.} and R. Milner and A. Most and V. Muccifora and R. Mussa and A. Nagaitsev and Y. Naryshkin and Nathan, {A. M.} and F. Neunreither and Niczyporuk, {J. M.} and Nowak, {W. D.} and M. Nupieri and O'Neill, {T. G.} and R. Openshaw and J. Ouyang and Owen, {B. R.} and V. Papavassiliou and Pate, {S. F.} and M. Pitt and S. Potashov and Potterveld, {D. H.} and G. Rakness and A. Reali and R. Redwine and Reolon, {A. R.} and R. Ristinen and K. Rith and P. Rossi and S. Rudnitsky and M. Ruh and D. Ryckbosch and Yasuhiro Sakemi and I. Savin and C. Scarlett and F. Schmidt and H. Schmitt and G. Schnell and Sch{\"u}ler, {K. P.} and A. Schwind and J. Seibert and Shibata, {T. A.} and K. Shibatani and T. Shin and V. Shutov and C. Simani and A. Simon and K. Sinram and P. Slavich and M. Spengos and E. Steffens and J. Stenger and J. Stewart and U. St{\"o}sslein and M. Sutter and H. Tallini and S. Taroian and A. Terkulov and E. Thomas and B. Tipton and M. Tytgat and Urciuoli, {G. M.} and {Van Den Brand}, {J. F.J.} and {Van Der Steenhoven}, G. and {Van De Vyver}, R. and {Van Hunen}, {J. J.} and Vetterli, {M. C.} and V. Vikhrov and Vincter, {M. G.} and J. Visser and E. Volk and W. Wander and J. Wendland and Williamson, {S. E.} and T. Wise and K. Woller and S. Yoneyama and H. Zohrabian",

year = "2001",

month = dec,

day = "1",

language = "English",

volume = "64",

journal = "Physical review D: Particles and fields",

issn = "0556-2821",

publisher = "American Institute of Physics",

number = "11",

}

TY - JOUR

T1 - Measurement of longitudinal spin transfer to Λ hyperons in deep-inelastic lepton scattering

AU - Airapetian, A.

AU - Akopov, N.

AU - Amarian, M.

AU - Aschenauer, E. C.

AU - Avakian, H.

AU - Avakian, R.

AU - Avetissian, A.

AU - Bains, B.

AU - Baumgarten, C.

AU - Beckmann, M.

AU - Belostotski, S.

AU - Belz, J. E.

AU - Benisch, Th

AU - Bernreuther, S.

AU - Bianchi, N.

AU - Blouw, J.

AU - Böttcher, H.

AU - Borissov, A.

AU - Bouwhuis, M.

AU - Brack, J.

AU - Brauksiepe, S.

AU - Braun, B.

AU - Bray, B.

AU - Brons, S.

AU - Brückner, W.

AU - Brüll, A.

AU - Bruins, E. E.W.

AU - Bulten, H. J.

AU - Capitani, G. P.

AU - Carter, P.

AU - Chumney, P.

AU - Cisbani, E.

AU - Court, G. R.

AU - Dalpiaz, P. F.

AU - De Sanctis, E.

AU - De Schepper, D.

AU - Devitsin, E.

AU - De Witt Huberts, P. K.A.

AU - Di Nezza, P.

AU - Düren, M.

AU - Dvoredsky, A.

AU - Elbakian, G.

AU - Ely, J.

AU - Fantoni, A.

AU - Fechtchenko, A.

AU - Ferstl, M.

AU - Fiedler, K.

AU - Filippone, B. W.

AU - Fischer, H.

AU - Fox, B.

AU - Franz, J.

AU - Frullani, S.

AU - Funk, M. A.

AU - Gärber, Y.

AU - Gao, H.

AU - Garibaldi, F.

AU - Gavrilov, G.

AU - Geiger, P.

AU - Gharibyan, V.

AU - Golendukhin, A.

AU - Graw, G.

AU - Grebeniouk, O.

AU - Green, P. W.

AU - Greeniaus, L. G.

AU - Grosshauser, C.

AU - Guidal, M.

AU - Gute, A.

AU - Gyurjyan, V.

AU - Haas, J. P.

AU - Haeberli, W.

AU - Hausser, O.

AU - Hansen, J. O.

AU - Hartig, M.

AU - Hasch, D.

AU - Heinsius, F. H.

AU - Henderson, R.

AU - Henoch, M.

AU - Hertenberger, R.

AU - Holler, Y.

AU - Holt, R. J.

AU - Hoprich, W.

AU - Ihssen, H.

AU - Iodice, M.

AU - Izotov, A.

AU - Jackson, H. E.

AU - Jgoun, A.

AU - Kaiser, R.

AU - Kinney, E.

AU - Kirsch, M.

AU - Kisselev, A.

AU - Kitching, P.

AU - Kobayashi, H.

AU - Koch, N.

AU - Königsmann, K.

AU - Kolstein, M.

AU - Kolster, H.

AU - Korotkov, V.

AU - Korsch, W.

AU - Kozlov, V.

AU - Kramer, L. H.

AU - Krivokhijine, V. G.

AU - Kurisuno, M.

AU - Kyle, G.

AU - Lachnit, W.

AU - Lenisa, P.

AU - Lorenzon, W.

AU - Makins, N. C.R.

AU - Manaenkov, S. I.

AU - Martens, F. K.

AU - Martin, J. W.

AU - Masoli, F.

AU - Mateos, A.

AU - McAndrew, M.

AU - McIlhany, K.

AU - McKeown, R. D.

AU - Meissner, F.

AU - Menden, F.

AU - Metz, A.

AU - Meyners, N.

AU - Mikloukho, O.

AU - Miller, C. A.

AU - Miller, M. A.

AU - Milner, R.

AU - Most, A.

AU - Muccifora, V.

AU - Mussa, R.

AU - Nagaitsev, A.

AU - Naryshkin, Y.

AU - Nathan, A. M.

AU - Neunreither, F.

AU - Niczyporuk, J. M.

AU - Nowak, W. D.

AU - Nupieri, M.

AU - O'Neill, T. G.

AU - Openshaw, R.

AU - Ouyang, J.

AU - Owen, B. R.

AU - Papavassiliou, V.

AU - Pate, S. F.

AU - Pitt, M.

AU - Potashov, S.

AU - Potterveld, D. H.

AU - Rakness, G.

AU - Reali, A.

AU - Redwine, R.

AU - Reolon, A. R.

AU - Ristinen, R.

AU - Rith, K.

AU - Rossi, P.

AU - Rudnitsky, S.

AU - Ruh, M.

AU - Ryckbosch, D.

AU - Sakemi, Yasuhiro

AU - Savin, I.

AU - Scarlett, C.

AU - Schmidt, F.

AU - Schmitt, H.

AU - Schnell, G.

AU - Schüler, K. P.

AU - Schwind, A.

AU - Seibert, J.

AU - Shibata, T. A.

AU - Shibatani, K.

AU - Shin, T.

AU - Shutov, V.

AU - Simani, C.

AU - Simon, A.

AU - Sinram, K.

AU - Slavich, P.

AU - Spengos, M.

AU - Steffens, E.

AU - Stenger, J.

AU - Stewart, J.

AU - Stösslein, U.

AU - Sutter, M.

AU - Tallini, H.

AU - Taroian, S.

AU - Terkulov, A.

AU - Thomas, E.

AU - Tipton, B.

AU - Tytgat, M.

AU - Urciuoli, G. M.

AU - Van Den Brand, J. F.J.

AU - Van Der Steenhoven, G.

AU - Van De Vyver, R.

AU - Van Hunen, J. J.

AU - Vetterli, M. C.

AU - Vikhrov, V.

AU - Vincter, M. G.

AU - Visser, J.

AU - Volk, E.

AU - Wander, W.

AU - Wendland, J.

AU - Williamson, S. E.

AU - Wise, T.

AU - Woller, K.

AU - Yoneyama, S.

AU - Zohrabian, H.

PY - 2001/12/1

Y1 - 2001/12/1

N2 - Spin transfer in deep-inelastic Λ electroproduction has been studied with the HERMES detector using the 27.6 GeV polarized positron beam in the DESY HERA storage ring. For an average fractional energy transfer 〈z〉 = 0.45, the longitudinal spin transfer from the virtual photon to the Λ has been extracted. The spin transfer along the Λ momentum direction is found to be 0.11±0.17(stat)±0.03(syst); similar values are found for other possible choices for the longitudinal spin direction of the Λ. 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 Λ spin content, and is consistent with the assumption of helicity conservation in the fragmentation process.

AB - Spin transfer in deep-inelastic Λ electroproduction has been studied with the HERMES detector using the 27.6 GeV polarized positron beam in the DESY HERA storage ring. For an average fractional energy transfer 〈z〉 = 0.45, the longitudinal spin transfer from the virtual photon to the Λ has been extracted. The spin transfer along the Λ momentum direction is found to be 0.11±0.17(stat)±0.03(syst); similar values are found for other possible choices for the longitudinal spin direction of the Λ. 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 Λ spin content, and is consistent with the assumption of helicity conservation in the fragmentation process.

UR - http://www.scopus.com/inward/record.url?scp=0035581061&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035581061&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0035581061

VL - 64

JO - Physical review D: Particles and fields

JF - Physical review D: Particles and fields

SN - 0556-2821

IS - 11

M1 - 112005

ER -