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Titolo:
Measurement of the Lambda polarization in nu(mu) charged current interactions in the NOMAD experiment
Autore:
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, PW; 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; Silva, EDE; Dumarchez, J; Ellis, M; Fazio, T; Feldman, GJ; Ferrari, R; Ferrere, D; Flaminio, V; Fraternali, M; Gaillard, JM; Gangler, E; Geiser, A; Geppert, D; Gibin, D; Gninenko, S; Godley, A; Gomez-Cadenas, JJ; Gosset, J; Gossling, 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, JM; Linssen, L; Ljubicic, A; Long, J; Lupi, A; Marchionni, A; Martelli, F; Mechain, X; Mendiburu, JP; Meyer, JP; Mezzetto, M; Mishra, SR; Moorhead, GF; Naumov, D; Nedelec, P; Nefedov, Y; Nguyen-Mau, C; Orestano, D; Pastore, F; Peak, LS; Pannacchio, 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, FJP; Sozzi, G; Steele, D; Stiegler, U; Stipcevic, M; Stolarczyk, T; Tareb-Reyes, M; Taylor, GN; Tereshchenko, V; Toropin, A; Touchard, AM; Tovey, SN; Tran, MT; Tsesmelis, E; Ulrichs, J; Vacavant, L; Valdata-Nappi, M; Valuev, V; Vannucci, F; Varvell, KE; Veltri, M; Vercesi, V; Vieira, JM; Vinogradova, T; Weber, FV; Weisse, T; Wilson, FF; Winton, LJ; Yabsley, BD; Zaccone, H; Zuber, K; Zuccon, P;
Indirizzi:
Univ Paris 06, LPNHE, Paris, France Univ Paris 06 Paris FranceUniv Paris 06, LPNHE, Paris, France Univ Paris 07, Paris, France Univ Paris 07 Paris FranceUniv Paris 07, Paris, France LAPP, Annecy, France LAPP Annecy FranceLAPP, Annecy, France Johns Hopkins Univ, Baltimore, MD 21218 USA Johns Hopkins Univ Baltimore MD USA 21218 s Univ, Baltimore, MD 21218 USA Harvard Univ, Cambridge, MA 02138 USA Harvard Univ Cambridge MA USA 02138Harvard Univ, Cambridge, MA 02138 USA Univ Calabria, I-87036 Cosenza, Italy Univ Calabria Cosenza Italy I-87036 niv Calabria, I-87036 Cosenza, Italy Ist Nazl Fis Nucl, Cosenza, Italy Ist Nazl Fis Nucl Cosenza ItalyIst Nazl Fis Nucl, Cosenza, Italy Univ Dortmund, D-44221 Dortmund, Germany Univ Dortmund Dortmund Germany D-44221 rtmund, D-44221 Dortmund, Germany JINR, Dubna, Russia JINR Dubna RussiaJINR, Dubna, Russia Univ Florence, Florence, Italy Univ Florence Florence ItalyUniv Florence, Florence, Italy Ist Nazl Fis Nucl, I-50125 Florence, Italy Ist Nazl Fis Nucl Florence Italy I-50125 s Nucl, I-50125 Florence, Italy CERN, Geneva, Switzerland CERN Geneva SwitzerlandCERN, Geneva, Switzerland Univ Lausanne, CH-1015 Lausanne, Switzerland Univ Lausanne Lausanne Switzerland CH-1015 CH-1015 Lausanne, Switzerland Univ Calif Los Angeles, Los Angeles, CA 90024 USA Univ Calif Los Angeles Los Angeles CA USA 90024 Los Angeles, CA 90024 USA Univ Melbourne, Parkville, Vic 3052, Australia Univ Melbourne Parkville Vic Australia 3052 arkville, Vic 3052, Australia Russian Acad Sci, Inst Nucl Res, Moscow, Russia Russian Acad Sci Moscow Russia Acad Sci, Inst Nucl Res, Moscow, Russia Univ Padua, Padua, Italy Univ Padua Padua ItalyUniv Padua, Padua, Italy Ist Nazl Fis Nucl, Padua, Italy Ist Nazl Fis Nucl Padua ItalyIst Nazl Fis Nucl, Padua, Italy Univ Pavia, I-27100 Pavia, Italy Univ Pavia Pavia Italy I-27100Univ Pavia, I-27100 Pavia, Italy Ist Nazl Fis Nucl, I-27100 Pavia, Italy Ist Nazl Fis Nucl Pavia Italy I-27100 azl Fis Nucl, I-27100 Pavia, Italy Univ Pisa, Pisa, Italy Univ Pisa Pisa ItalyUniv Pisa, Pisa, Italy Ist Nazl Fis Nucl, Pisa, Italy Ist Nazl Fis Nucl Pisa ItalyIst Nazl Fis Nucl, Pisa, Italy Roma Tre Univ, Rome, Italy Roma Tre Univ Rome ItalyRoma Tre Univ, Rome, Italy Ist Nazl Fis Nucl, Rome, Italy Ist Nazl Fis Nucl Rome ItalyIst Nazl Fis Nucl, Rome, Italy CEA Saclay, DAPNIA, Gif Sur Yvette, France CEA Saclay Gif Sur Yvette France Saclay, DAPNIA, Gif Sur Yvette, France Univ S Carolina, Columbia, SC 29208 USA Univ S Carolina Columbia SC USA 29208 S Carolina, Columbia, SC 29208 USA Univ Sydney, Sydney, NSW 2006, Australia Univ Sydney Sydney NSW Australia2006 Sydney, Sydney, NSW 2006, Australia Univ Urbino, Florence, Italy Univ Urbino Florence ItalyUniv Urbino, Florence, Italy Ist Nazl Fis Nucl, I-50125 Florence, Italy Ist Nazl Fis Nucl Florence Italy I-50125 s Nucl, I-50125 Florence, Italy IFIC, Valencia, Spain IFIC Valencia SpainIFIC, Valencia, Spain Rudjer Boskovic Inst, Zagreb, Croatia Rudjer Boskovic Inst Zagreb Croatia djer Boskovic Inst, Zagreb, Croatia ETH Zurich, Zurich, Switzerland ETH Zurich Zurich SwitzerlandETH Zurich, Zurich, Switzerland
Titolo Testata:
NUCLEAR PHYSICS B
fascicolo: 1-2, volume: 588, anno: 2000,
pagine: 3 - 36
SICI:
0550-3213(20001106)588:1-2<3:MOTLPI>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
STRANGE PARTICLE-PRODUCTION; DEEP-INELASTIC-SCATTERING; LEPTON-NUCLEON SCATTERING; MUON-PROTON-SCATTERING; LUND MONTE-CARLO; ELECTROMAGNETIC CALORIMETER; SPIN STRUCTURE; QUARK DISTRIBUTIONS; JET FRAGMENTATION; E+E-PHYSICS;
Keywords:
neutrino interactions; lambda polarization; nucleon spin; spin transfer;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
62
Recensione:
Indirizzi per estratti:
Indirizzo: Di Lella, L Univ Paris 06, LPNHE, Paris, France Univ Paris 06 Paris France v Paris 06, LPNHE, Paris, France
Citazione:
P. Astier et al., "Measurement of the Lambda polarization in nu(mu) charged current interactions in the NOMAD experiment", NUCL PHYS B, 588(1-2), 2000, pp. 3-36

Abstract

The Lambda polarization in upsilon (mu) charged current interactions has been measured in the NOMAD experiment. The event sample (8087 reconstructed Lambda '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: P-x(x(F) < 0) = -0.21 +/-0.04(stat) +/- 0.02(sys). In the current fragmentation region we find P-x(x(F) > 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 tin the direction orthogonal to the Lambda production plane! has been observed for the first time in a neutrino experiment: P-y = -0.22 +/- 0.03(stat) +/- 0.01(sys). The dependence of the absolute value of P-y on the Lambda transverse momentum with respect to the hadronic jet direction is in qualitative agreement with the resuits from unpolarized hadron-hadron experiments. (C) 2000 Elsevier Science B.V. All rights reserved.

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Documento generato il 24/11/20 alle ore 08:28:17