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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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 › peer-review
}
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 -