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

Publication ,  Journal Article
Airapetian, A; Akopov, N; Amarian, M; Aschenauer, EC; Avakian, H; Avakian, R; Avetissian, A; Bains, B; Baumgarten, C; Beckmann, M; Belz, JE ...
Published in: Physical Review D
2001

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. ©2001 the American Physical Society.

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Published In

Physical Review D

ISSN

0556-2821

Publication Date

2001

Volume

64

Issue

11

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5101 Astronomical sciences
  • 4902 Mathematical physics
  • 0206 Quantum Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
 

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Airapetian, A., Akopov, N., Amarian, M., Aschenauer, E. C., Avakian, H., Avakian, R., … Zohrabian, H. (2001). Measurement of longitudinal spin transfer to Λ hyperons in deep-inelastic lepton scattering. Physical Review D, 64(11).
Airapetian, A., N. Akopov, M. Amarian, E. C. Aschenauer, H. Avakian, R. Avakian, A. Avetissian, et al. “Measurement of longitudinal spin transfer to Λ hyperons in deep-inelastic lepton scattering.” Physical Review D 64, no. 11 (2001).
Airapetian A, Akopov N, Amarian M, Aschenauer EC, Avakian H, Avakian R, et al. Measurement of longitudinal spin transfer to Λ hyperons in deep-inelastic lepton scattering. Physical Review D. 2001;64(11).
Airapetian, A., et al. “Measurement of longitudinal spin transfer to Λ hyperons in deep-inelastic lepton scattering.” Physical Review D, vol. 64, no. 11, 2001.
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, Sanctis ED, Schepper DD, Devitsin E, Huberts PKADW, Nezza PD, 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, Brand JFJVD, Steenhoven GVD, Vyver RVD, Hunen JJV, Vetterli MC, Vikhrov V, Vincter MG, Visser J, Volk E, Wander W, Wendland J, Williamson SE, Wise T, Woller K, Yoneyama S, Zohrabian H. Measurement of longitudinal spin transfer to Λ hyperons in deep-inelastic lepton scattering. Physical Review D. 2001;64(11).

Published In

Physical Review D

ISSN

0556-2821

Publication Date

2001

Volume

64

Issue

11

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5101 Astronomical sciences
  • 4902 Mathematical physics
  • 0206 Quantum Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences