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. Häusser; 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

doi:10.1103/PhysRevD.64.112005

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. Häusser, 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

Physics And Astronomy

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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
Pages (from-to)	1120051-1120057
Number of pages	7
Journal	Physical review D
Volume	64
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevD.64.112005
State	Published - Dec 1 2001

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevD.64.112005

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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., ... Kozlov, V. (2001). Measurement of longitudinal spin transfer to Λ hyperons in deep-inelastic lepton scattering. Physical review D, 64(11), 1120051-1120057. Article 112005. https://doi.org/10.1103/PhysRevD.64.112005

@article{d98c63b9d9944e988488fa03da427294,

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. H{\"a}usser 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",

year = "2001",

month = dec,

day = "1",

doi = "10.1103/PhysRevD.64.112005",

language = "English",

volume = "64",

pages = "1120051--1120057",

number = "11",

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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, Häusser, 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 2001, 'Measurement of longitudinal spin transfer to Λ hyperons in deep-inelastic lepton scattering', Physical review D, vol. 64, no. 11, 112005, pp. 1120051-1120057. https://doi.org/10.1103/PhysRevD.64.112005

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 - Häusser, 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.

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

U2 - 10.1103/PhysRevD.64.112005

DO - 10.1103/PhysRevD.64.112005

M3 - Article

AN - SCOPUS:0035581061

SN - 0556-2821

VL - 64

SP - 1120051

EP - 1120057

JO - Physical review D

JF - Physical review D

IS - 11

M1 - 112005

ER -

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

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