Measurement of spin-transfer observables in pp to $\Lambda \Lambda$ at 1.637 GeV/c

Spin-transfer observables for pp to Lambda Lambda have been measured using a transversely polarized frozen-spin target and a beam momentum of 1.637 GeV/c. Current models of the reaction near threshold are in good agreement with existing measurements performed with unpolarized particles in the initia...

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Detalles Bibliográficos
Autores principales: Bassalleck, B., Berdoz, A., Bradtke, C., Broders, R., Bunker, B., Dennert, H., Dutz, H., Eilerts, S., Eyrich, W., Fields, D., Fischer, H., Franklin, G., Franz, J., Gehring, R., Geyer, R., Goertz, S., Harmsen, J., Hauffe, J., Heinsius, F.H., Hertzog, D., Johansson, T., Jones, T., Khaustov, P., Kilian, K., Kingsberry, P., Kriegler, E., Lowe, J., Meier, A., Metzger, A., Meyer, C.A., Meyer, W., Moosburger, M., Oelert, W., Paschke, K.D., Pluckthun, M., Pomp, S., Quinn, B., Radtke, E., Reicherz, G., Rohrich, K., Sachs, K., Schmitt, H., Schoch, B., Sefzick, T., Stinzing, F., Stotzer, R., Tayloe, R., Wirth, St.
Lenguaje:eng
Publicado: 2002
Materias:
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1103/PhysRevLett.89.212302
http://cds.cern.ch/record/623650
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author Bassalleck, B.
Berdoz, A.
Bradtke, C.
Broders, R.
Bunker, B.
Dennert, H.
Dutz, H.
Eilerts, S.
Eyrich, W.
Fields, D.
Fischer, H.
Franklin, G.
Franz, J.
Gehring, R.
Geyer, R.
Goertz, S.
Harmsen, J.
Hauffe, J.
Heinsius, F.H.
Hertzog, D.
Johansson, T.
Jones, T.
Khaustov, P.
Kilian, K.
Kingsberry, P.
Kriegler, E.
Lowe, J.
Meier, A.
Metzger, A.
Meyer, C.A.
Meyer, W.
Moosburger, M.
Oelert, W.
Paschke, K.D.
Pluckthun, M.
Pomp, S.
Quinn, B.
Radtke, E.
Reicherz, G.
Rohrich, K.
Sachs, K.
Schmitt, H.
Schoch, B.
Sefzick, T.
Stinzing, F.
Stotzer, R.
Tayloe, R.
Wirth, St.
author_facet Bassalleck, B.
Berdoz, A.
Bradtke, C.
Broders, R.
Bunker, B.
Dennert, H.
Dutz, H.
Eilerts, S.
Eyrich, W.
Fields, D.
Fischer, H.
Franklin, G.
Franz, J.
Gehring, R.
Geyer, R.
Goertz, S.
Harmsen, J.
Hauffe, J.
Heinsius, F.H.
Hertzog, D.
Johansson, T.
Jones, T.
Khaustov, P.
Kilian, K.
Kingsberry, P.
Kriegler, E.
Lowe, J.
Meier, A.
Metzger, A.
Meyer, C.A.
Meyer, W.
Moosburger, M.
Oelert, W.
Paschke, K.D.
Pluckthun, M.
Pomp, S.
Quinn, B.
Radtke, E.
Reicherz, G.
Rohrich, K.
Sachs, K.
Schmitt, H.
Schoch, B.
Sefzick, T.
Stinzing, F.
Stotzer, R.
Tayloe, R.
Wirth, St.
author_sort Bassalleck, B.
collection CERN
description Spin-transfer observables for pp to Lambda Lambda have been measured using a transversely polarized frozen-spin target and a beam momentum of 1.637 GeV/c. Current models of the reaction near threshold are in good agreement with existing measurements performed with unpolarized particles in the initial state but produce conflicting predictions for the spin-transfer observables D/sub nn/ and K/sub nn/ (the normal-to-normal depolarization and polarization transfer), which are measurable only with polarized target or beam. Measurements of D/sub nn/ and K/sub nn/ presented here are found to be in disagreement with predictions from these models. (21 refs).
id cern-623650
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2002
record_format invenio
spelling cern-6236502023-03-14T20:20:45Zdoi:10.1103/PhysRevLett.89.212302http://cds.cern.ch/record/623650engBassalleck, B.Berdoz, A.Bradtke, C.Broders, R.Bunker, B.Dennert, H.Dutz, H.Eilerts, S.Eyrich, W.Fields, D.Fischer, H.Franklin, G.Franz, J.Gehring, R.Geyer, R.Goertz, S.Harmsen, J.Hauffe, J.Heinsius, F.H.Hertzog, D.Johansson, T.Jones, T.Khaustov, P.Kilian, K.Kingsberry, P.Kriegler, E.Lowe, J.Meier, A.Metzger, A.Meyer, C.A.Meyer, W.Moosburger, M.Oelert, W.Paschke, K.D.Pluckthun, M.Pomp, S.Quinn, B.Radtke, E.Reicherz, G.Rohrich, K.Sachs, K.Schmitt, H.Schoch, B.Sefzick, T.Stinzing, F.Stotzer, R.Tayloe, R.Wirth, St.Measurement of spin-transfer observables in pp to $\Lambda \Lambda$ at 1.637 GeV/cParticle Physics - ExperimentSpin-transfer observables for pp to Lambda Lambda have been measured using a transversely polarized frozen-spin target and a beam momentum of 1.637 GeV/c. Current models of the reaction near threshold are in good agreement with existing measurements performed with unpolarized particles in the initial state but produce conflicting predictions for the spin-transfer observables D/sub nn/ and K/sub nn/ (the normal-to-normal depolarization and polarization transfer), which are measurable only with polarized target or beam. Measurements of D/sub nn/ and K/sub nn/ presented here are found to be in disagreement with predictions from these models. (21 refs).Spin transfer observables for the strangeness-production reaction Antiproton-Proton -> Antilambda-Lambda have been measured by the PS185 collaboration using a transversely-polarized frozen-spin target with an antiproton beam momentum of 1.637 GeV/c at the Low Energy Antiproton Ring at CERN. This measurement investigates observables for which current models of the reaction near threshold make significantly differing predictions. Those models are in good agreement with existing measurements performed with unpolarized particles in the initial state. Theoretical attention has focused on the fact that these models produce conflicting predictions for the spin-transfer observables D_{nn} and K_{nn}, which are measurable only with polarized target or beam. Results presented here for D_{nn} and K_{nn} are found to be in disagreement with predictions from existing models. These results also underscore the importance of singlet-state production at backward angles, while current models predict complete or near-complete triplet-state dominance.nucl-ex/0206005oai:cds.cern.ch:6236502002
spellingShingle Particle Physics - Experiment
Bassalleck, B.
Berdoz, A.
Bradtke, C.
Broders, R.
Bunker, B.
Dennert, H.
Dutz, H.
Eilerts, S.
Eyrich, W.
Fields, D.
Fischer, H.
Franklin, G.
Franz, J.
Gehring, R.
Geyer, R.
Goertz, S.
Harmsen, J.
Hauffe, J.
Heinsius, F.H.
Hertzog, D.
Johansson, T.
Jones, T.
Khaustov, P.
Kilian, K.
Kingsberry, P.
Kriegler, E.
Lowe, J.
Meier, A.
Metzger, A.
Meyer, C.A.
Meyer, W.
Moosburger, M.
Oelert, W.
Paschke, K.D.
Pluckthun, M.
Pomp, S.
Quinn, B.
Radtke, E.
Reicherz, G.
Rohrich, K.
Sachs, K.
Schmitt, H.
Schoch, B.
Sefzick, T.
Stinzing, F.
Stotzer, R.
Tayloe, R.
Wirth, St.
Measurement of spin-transfer observables in pp to $\Lambda \Lambda$ at 1.637 GeV/c
title Measurement of spin-transfer observables in pp to $\Lambda \Lambda$ at 1.637 GeV/c
title_full Measurement of spin-transfer observables in pp to $\Lambda \Lambda$ at 1.637 GeV/c
title_fullStr Measurement of spin-transfer observables in pp to $\Lambda \Lambda$ at 1.637 GeV/c
title_full_unstemmed Measurement of spin-transfer observables in pp to $\Lambda \Lambda$ at 1.637 GeV/c
title_short Measurement of spin-transfer observables in pp to $\Lambda \Lambda$ at 1.637 GeV/c
title_sort measurement of spin-transfer observables in pp to $\lambda \lambda$ at 1.637 gev/c
topic Particle Physics - Experiment
url https://dx.doi.org/10.1103/PhysRevLett.89.212302
http://cds.cern.ch/record/623650
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