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EnglishThe 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. RI Vercesi, Valerio/C-6672-2008; Collazuol, Gianmaria/C-5670-2012; Soler, Paul/E-8464-2011; Moorhead, Gareth/B-6634-2009
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| Autori: | 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 |
| Titolo: | Measurement of the Lambda polarization in nu(mu) charged current interactions in the NOMAD experiment |
| Anno del prodotto: | 2000 |
| Digital Object Identifier (DOI): | 10.1016/S0550-3213(00)00503-4 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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