Measurement of the Λ polarization in νμ charged current interactions in the NOMAD experiment
Creators
- Astier, P.
- Autiero, D.
- Baldisseri, A.
- Baldo-Ceolin, M.
- Banner, M.
- Bassompierre, G.
- Benslama, K.
- Besson, N.
- Bird, I.
- Blumenfeld, B.
- Bobisut, F.
- Bouchez, J.
- Boyd, S.
- Bueno, A.
- Bunyatov, S.
- Camilleri, L.
- Cardini, A.
- Cattaneo, P.W.
- Cavasinni, V.
- Cervera-Villanueva, A.
- Chukanov, A.
- Collazuol, G.
- Conforto, G.
- Conta, C.
- Contalbrigo, M.
- Cousins, R.
- Daniels, D.
- Degaudenzi, H.
- Del Prete, T.
- De Santo, A.
- Dignan, T.
- Di Lella, L.
- Couto e Silva, E. do
- Dumarchez, J.
- Ellis, M.
- Fazio, T.
- Feldman, G.J.
- Ferrari, R.
- Ferrere, D.
- Flaminio, V.
- Fraternali, M.
- Gaillard, J.-M.
- Gangler, E.
- Geiser, A.
- Geppert, D.
- Gibin, D.
- Gninenko, S.
- Godley, A.
- Gomez-Cadenas, J.-J.
- Gosset, J.
- Goessling, C.
- Gouanere, M.
- Grant, A.
- Graziani, G.
- Guglielmi, A.
- Hagner, C.
- Hernando, J.
- Hubbard, D.
- Hurst, P.
- Hyett, N.
- Iacopini, E.
- Joseph, C.
- Juget, F.
- Kirsanov, M.
- Klimov, O.
- Kokkonen, J.
- Kovzelev, A.
- Krasnoperov, A.
- Kustov, D.
- Kuznetsov, V.
- Lacaprara, S.
- Lachaud, C.
- Lakic, B.
- Lanza, A.
- La Rotonda, L.
- Laveder, M.
- Letessier-Selvon, A.
- Levy, J.-M.
- Linssen, L.
- Ljubicic, A.
- Long, J.
- Lupi, A.
- Marchionni, A.
- Martelli, F.
- Mechain, X.
- Mendiburu, J.-P.
- Meyer, J.-P.
- Mezzetto, M.
- Mishra, S.R.
- Moorhead, G.F.
- Naumov, D.
- Nedelec, P.
- Nefedov, Yu.
- Nguyen-Mau, C.
- Orestano, D.
- Pastore, F.
- Peak, L.S.
- Pennacchio, E.
- Pessard, H.
- Petti, R.
- Placci, A.
- Polesello, G.
- Pollmann, D.
- Polyarush, A.
- Popov, B.
- Poulsen, C.
- Rathouit, P.
- Rico, J.
- Riemann, P.
- Roda, C.
- Rubbia, A.
- Salvatore, F.
- Schahmaneche, K.
- Schmidt, B.
- Schmidt, T.
- Sevior, M.
- Sillou, D.
- Soler, F.J.P.
- Sozzi, G.
- Steele, D.
- Stiegler, U.
- Stipcevic, M.
- Stolarczyk, Th.
- Tareb-Reyes, M.
- Taylor, G.N.
- Tereshchenko, V.
- Toropin, A.
- Touchard, A.-M.
- Tovey, S.N.
- Tran, M.-T.
- Tsesmelis, E.
- Ulrichs, J.
- Vacavant, L.
- Valdata-Nappi, M.
- Valuev, V.
- Vannucci, F.
- Varvell, K.E.
- Veltri, M.
- Vercesi, V.
- Vieira, J.-M.
- Vinogradova, T.
- Weber, F.V.
- Weisse, T.
- Wilson, F.F.
- Winton, L.J.
- Yabsley, B.D.
- Zaccone, H.
- Zuber, K.
- Zuccon, P.
Description
The Λ polarization in νμ charged current interactions has been measured in the NOMAD experiment. The event sample (8087 reconstructed Λ 's) is more than an order of magnitude larger than that of previous bubble chamber experiments, while the quality of event reconstruction is comparable. We observe negative polarization along the W -boson direction which is enhanced in the target fragmentation region: Px(xF<0)=-0.21±0.04(stat)±0.02(sys) . In the current fragmentation region we find Px(xF>0)=-0.09±0.06(stat)±0.03(sys) . These results provide a test of different models describing the nucleon spin composition and the spin transfer mechanisms. A significant transverse polarization (in the direction orthogonal to the Λ production plane) has been observed for the first time in a neutrino experiment: Py=-0.22±0.03(stat)±0.01(sys) . The dependence of the absolute value of Py on the Λ transverse momentum with respect to the hadronic jet direction is in qualitative agreement with the results from unpolarized hadron-hadron experiments
Additional details
Identifiers
- PII
- S0550321300005034;
Publishing Information
- Journal Title
- Nuclear Physics. B
- Journal Volume
- 588
- Journal Issue
- 1-2
- Journal Page Range
- p. 3-36
- ISSN
- 0550-3213
- CODEN
- NUPBBO
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 35027433
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Descriptors DEI
- CHARGED-CURRENT INTERACTIONS; HADRON-HADRON INTERACTIONS; INTERMEDIATE BOSONS; MUON NEUTRINOS; NEUTRINO DETECTION; NEUTRINO-NEUTRINO INTERACTIONS; POLARIZATION; SPIN; TRANSVERSE MOMENTUM
- Descriptors DEC
- ANGULAR MOMENTUM; BOSONS; DETECTION; ELEMENTARY PARTICLES; FERMIONS; INTERACTIONS; LEPTON-LEPTON INTERACTIONS; LEPTONS; LINEAR MOMENTUM; MASSLESS PARTICLES; NEUTRINOS; PARTICLE INTERACTIONS; PARTICLE PROPERTIES; RADIATION DETECTION
Optional Information
- Copyright
- Copyright (c) 2000 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.