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Measurement of the lambda polarization in nu_mu charged current interactions in the NOMAD experiment


Astier, P.; Autiero, D.; Baldisseri, A.; Baldo-Ceolin, M.; Ballocchi, G.; Banner, M.; Bassompierre, G.; Benslama, K.; Besson, N.; Bird, I. et al.
Measurement of the lambda polarization in nu_mu charged current interactions in the NOMAD experiment // Nuclear physics B, 588 (2000), 3-36 (međunarodna recenzija, članak, znanstveni)


Naslov
Measurement of the lambda polarization in nu_mu charged current interactions in the NOMAD experiment

Autori
Astier, P. ; Autiero, D. ; Baldisseri, A. ; Baldo-Ceolin, M. ; Ballocchi, G. ; 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. ; do Couto e Silva, E. ; 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.M. ; Klimov, O. ; Kokkonen, J. ; Kovzelev, A. ; Krasnoperov, A. ; Kuznetsov, V.E. ; Lacaprara, S. ; Lakić, Biljana ; Lanza, A. ; La Rotonda, L. ; Laveder, M. ; C. ; Letessier-Selvon, A. ; Levy, J.M. ; Linssen, L. ; Ljubičić, Ante ; Long, J. ; Lupi, A. ; Manola-Pogiolli, E. ; 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. ; Pluquet, A. ; Polesello, G. ; Pollmann, D. ; Polyarush, P. ; 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. ; Stipčević, Mario ; Stolarczyk, T. ; Tareb-Reyes, M. ; Taylor, G.N. ; Tereschenko, 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.

Izvornik
Nuclear physics B (0550-3213) 588 (2000); 3-36

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Neutrino interactions; lambda polarization; nucleon spin; spin transfer

Sažetak
The polarization in ľ charged current interactions has been measured in the NOMAD experiment. The event sample (8087 reconstructed '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)=0.21ą0.04(stat)ą0.02(sys). In the current fragmentation region we find (xF>0)=0.09ą0.06(stat)ą0.03(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 production plane) has been observed for the first time in a neutrino experiment: Py=0.22ą0.03(stat)ą0.01(sys) . The dependence of the absolute value of Py on the transverse momentum with respect to the hadronic jet direction is in qualitative agreement with the results from unpolarized hadron-hadron experiments.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
00980204

Ustanove
Institut "Ruđer Bošković", Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus