Measurement of the polarization in νμ charged current interactions in the NOMAD experiment

6533b833fe1ef96bd129caaf

RESEARCH PRODUCT

Measurement of the polarization in νμ charged current interactions in the NOMAD experiment

J. Long J. Gosset J.-p. Mendiburu J. A. Hernando Alessandro Cardini D. Gibin A. Letessier-selvon P. Hurst L. S. Peak T. Vinogradova A. Placci J.m. Gaillard Barry Blumenfeld L. Di Lella D. Steele D. Steele D. Daniels Giacomo Polesello M. Tareb-reyes Th. Stolarczyk D. Kustov A. Polyarush Kevin Varvell M. E. Sevior A. Cervera-villanueva A. Cervera-villanueva A. De Santo T. Dignan C. Conta M. Gouanere G. Vidal-sitjes M. Kirsanov Achim Geiser Achim Geiser Didier Ferrere B. Schmidt B. Schmidt Antonio Bueno Antonio Bueno R. Petti A. Marchionni R. Cousins Fergus Wilson O.l. Klimov J.-m. Vieira A. N. Toropin A.-m. Touchard T. Weisse André Rubbia André Rubbia G. Conforto G. Conforto A. Grant P. Nedelec L. Camilleri G. Bassompierre M. Mezzetto Caroline Poulsen Artem Chukanov E. Iacopini S. Boyd F. Martelli B. Lakić M. Veltri G. Collazuol Mario Stipčević J. Kokkonen G. N. Taylor Sergei Gninenko Sergei Gninenko Kai Zuber Malcolm Ellis A. Kovzelev Valentin Kuznetsov Valentin Kuznetsov Vincenzo Cavasinni E. Do Couto E Silva J-p. Meyer B. A. Popov B. A. Popov V. Flaminio L.j. Winton S.a. Bunyatov Nathalie Besson F. J. P. Soler F. J. P. Soler Roberto Ferrari J. Ulrichs Yu. Nefedov L. Vacavant J.j. Gómez-cadenas J.j. Gómez-cadenas L. La Rotonda G. Sozzi I. Bird I. Bird A. Baldisseri J. Bouchez U. Stiegler D. Geppert P.w. Cattaneo Ante Ljubičić Bruce Yabsley X. Méchain A. Guglielmi A. Lupi P. Riemann Claus Gößling Alexey Krasnoperov Alexey Krasnoperov F. Salvatore E. Tsesmelis Caren Hagner M. Baldo-ceolin M. Banner A. Lanza Marco Fraternali T. Schmidt A. Godley M. T. Tran E. Gangler E. Gangler Valerio Vercesi S.r. Mishra S.r. Mishra M. Valdata-nappi M. Valdata-nappi Frédéric Juget Chiara Roda Chiara Roda Vyacheslav Valuev Vyacheslav Valuev Dmitry V. Naumov P. Astier J. Rico F. Vannucci D. Autiero E. Pennacchio N. Hyett D. Pollmann D. Hubbard P. Zuccon H. Zaccone T. Fazio C. Joseph H. Pessard Domizia Orestano Marco Laveder L. Linssen J. Dumarchez M. Contalbrigo F.v. Weber F.v. Weber J. M. Levy H. Degaudenzi G. J. Feldman G. F. Moorhead C. Lachaud Giacomo Graziani K. Schahmaneche S. Lacaprara V. Tereshchenko F. Bobisut C. Nguyen-mau T. Del Prete D. Sillou S.n. Tovey S.n. Tovey Fr Pastore

subject

Physics Nuclear and High Energy Physics Angular momentum 010308 nuclear & particles physics Elementary particle Polarization (waves)7. Clean energy 01 natural sciences Nuclear physics 0103 physical sciences Bubble chamber High Energy Physics::Experiment Nuclear Experiment 010306 general physics Nucleon Charged current Lepton Boson

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)=−0.09±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.

year	journal	country	edition	language
2001-07-01	Nuclear Physics B

https://doi.org/10.1016/s0550-3213(01)00181-x