Measurement of the $\Lambda$ polarization in $\nu_\mu$ charged current interactions in the NOMAD experiment

P. Astier; D. Autiero; A. Baldisseri; M. Baldo-Ceolin; M. Banner; G. Bassompierre; K. Benslama; N. Besson; I. Bird; B. Blumenfeld; F. Bobisut; J. Bouchez; S. Boyd; A. Bueno; S. Bunyatov; L. Camilleri; A. Cardini; P W. Cattaneo; V. Cavasinni; A. Cervera-Villanueva; A. Chukanov; G M. Collazuol; G. Conforto; C. Conta; M. Contalbrigo; R. Cousins; D. Daniels; H. Degaudenzi; T. del Prete; A. de Santo; T. Dignan; L. Di Lella; E Silva E. Do Couto; J. Dumarchez; M. Ellis; T. Fazio; G J. Feldman; R. Ferrari; D. Ferrere; V. Flaminio; M. Fraternali; J.M. Gaillard; E. Gangler; A. Geiser; D. Geppert; D. Gibin; S. Gninenko; A. Godley; J J. Gomez-Cadenas; J. Gosset; C. Gssling; M. Gouanere; A. Grant; G. Graziani; a M. Guglielmi; C. Hagner; J. Hernando; D. Hubbard; P. Hurst; N. Hyett; E. Iacopini; C. Joseph; F. Juget; M. Kirsanov; O. Klimov; J. Kokkonen; A. Kovzelev; A. Krasnoperov; D. Kustov; V. Kuznetsov; S. Lacaprara; C. Lachaud; B. Lakic; A. Lanza; L. La Rotonda; M. Laveder; A. Letessier-Selvon; J M. Levy; L. Linssen; A. Ljubicic; J. Long; A. Lupi; A. Marchionni; F. Martelli; X. Mechain; J.P. Mendiburu; J P. Meyer; M. Mezzetto; S R. Mishra; G F. Moorhead; D. Naumov; P. Nedelec; Yu. Nefedov; C. Nguyen-Mau; D. Orestano; F. Pastore; L S. Peak; E. Pennacchio; H. Pessard; R. Petti; A. Placci; G. Polesello; D. Pollmann; A. Polyarush; B. Popov; C. Poulsen; P. Rathouit; J. Rico; P. Riemann; C. Roda; A. Rubbia; F. Salvatore; K. Schahmaneche; B. Schmidt; T. Schmidt; M E. Sevior; D. Sillou; F J P. Soler; Gabriella Sozzi; D. D. Steele; U. Stiegler; M. Stipcevic; T. Stolarczyk; M. Tareb-Reyes; G N. Taylor; S. Tereshchenko; A. Toropin; a M. Touchard; S N. Tovey; M T. Tran; E. Tsesmelis; J. Ulrichs; L. Vacavant; M. Valdata-Nappi; V. Valuev; F. Vannucci; K E. Varvell; M. Veltri; V. Vercesi; J M. Vieira; T. Vinogradova; F. Weber; T. Weisse; F F. Wilson; L J. Winton; B D. Yabsley; H. Zaccone; K. Zuber; P. Zuccon

Journal Articles Nuclear Physics B Year : 2000

Measurement of the $\Lambda$ polarization in $\nu_\mu$ charged current interactions in the NOMAD experiment

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P. Astier

Function : Author

D. Autiero

Function : Author

A. Baldisseri

Function : Author

M. Baldo-Ceolin

Function : Author

M. Banner

Function : Author

G. Bassompierre

Function : Author

Laboratoire d'Annecy de Physique des Particules

K. Benslama

Function : Author

N. Besson

Function : Author

I. Bird

Function : Author

B. Blumenfeld

Function : Author

F. Bobisut

Function : Author

J. Bouchez

Function : Author

S. Boyd

Function : Author

A. Bueno

Function : Author

S. Bunyatov

Function : Author

L. Camilleri

Function : Author

A. Cardini

Function : Author

P W. Cattaneo

Function : Author

V. Cavasinni

Function : Author

A. Cervera-Villanueva

Function : Author

A. Chukanov

Function : Author

G M. Collazuol

Function : Author

G. Conforto

Function : Author

C. Conta

Function : Author

M. Contalbrigo

Function : Author

R. Cousins

Function : Author

D. Daniels

Function : Author

H. Degaudenzi

Function : Author

T. del Prete

Function : Author

A. de Santo

Function : Author

T. Dignan

Function : Author

L. Di Lella

Function : Author

E Silva E. Do Couto

Function : Author

J. Dumarchez

Function : Author

M. Ellis

Function : Author

T. Fazio

Function : Author

Laboratoire d'Annecy de Physique des Particules

G J. Feldman

Function : Author

R. Ferrari

Function : Author

D. Ferrere

Function : Author

V. Flaminio

Function : Author

M. Fraternali

Function : Author

J.M. Gaillard

Function : Author

Laboratoire d'Annecy de Physique des Particules

E. Gangler

Function : Author

A. Geiser

Function : Author

D. Geppert

Function : Author

D. Gibin

Function : Author

S. Gninenko

Function : Author

A. Godley

Function : Author

J J. Gomez-Cadenas

Function : Author

J. Gosset

Function : Author

C. Gssling

Function : Author

M. Gouanere

Function : Author

Laboratoire d'Annecy de Physique des Particules

A. Grant

Function : Author

G. Graziani

Function : Author

a M. Guglielmi

Function : Author

C. Hagner

Function : Author

J. Hernando

Function : Author

D. Hubbard

Function : Author

P. Hurst

Function : Author

N. Hyett

Function : Author

E. Iacopini

Function : Author

C. Joseph

Function : Author

F. Juget

Function : Author

M. Kirsanov

Function : Author

O. Klimov

Function : Author

J. Kokkonen

Function : Author

A. Kovzelev

Function : Author

A. Krasnoperov

Function : Author

Laboratoire d'Annecy de Physique des Particules

D. Kustov

Function : Author

V. Kuznetsov

Function : Author

S. Lacaprara

Function : Author

C. Lachaud

Function : Author

B. Lakic

Function : Author

A. Lanza

Function : Author

L. La Rotonda

Function : Author

M. Laveder

Function : Author

A. Letessier-Selvon

Function : Author
PersonId : 739493
IdHAL : antoine-letessier-selvon
ORCID : 0000-0002-2044-3103
IdRef : 089440757

J M. Levy

Function : Author

L. Linssen

Function : Author

A. Ljubicic

Function : Author

J. Long

Function : Author

A. Lupi

Function : Author

A. Marchionni

Function : Author

F. Martelli

Function : Author

X. Mechain

Function : Author

J.P. Mendiburu

Function : Author

Laboratoire d'Annecy de Physique des Particules

J P. Meyer

Function : Author

M. Mezzetto

Function : Author

S R. Mishra

Function : Author

G F. Moorhead

Function : Author

D. Naumov

Function : Author

P. Nedelec

Function : Author

Laboratoire d'Annecy de Physique des Particules

Yu. Nefedov

Function : Author

C. Nguyen-Mau

Function : Author

D. Orestano

Function : Author

F. Pastore

Function : Author

L S. Peak

Function : Author

E. Pennacchio

Function : Author

H. Pessard

Function : Author

Laboratoire d'Annecy de Physique des Particules

R. Petti

Function : Author

A. Placci

Function : Author

G. Polesello

Function : Author

D. Pollmann

Function : Author

A. Polyarush

Function : Author

B. Popov

Function : Author
PersonId : 738388
IdHAL : boris-popov
ORCID : 0000-0001-5416-9301
IdRef : 178706841

C. Poulsen

Function : Author

P. Rathouit

Function : Author

J. Rico

Function : Author
PersonId : 755236
ORCID : 0000-0003-4137-1134

P. Riemann

Function : Author

C. Roda

Function : Author

A. Rubbia

Function : Author

F. Salvatore

Function : Author

K. Schahmaneche

Function : Author

B. Schmidt

Function : Author

T. Schmidt

Function : Author

M E. Sevior

Function : Author

D. Sillou

Function : Author

Laboratoire d'Annecy de Physique des Particules

F J P. Soler

Function : Author

Gabriella Sozzi

Function : Author

D. D. Steele

Function : Author

U. Stiegler

Function : Author

M. Stipcevic

Function : Author

T. Stolarczyk

Function : Author
PersonId : 170270
IdHAL : thierry-stolarczyk
ORCID : 0000-0002-0551-7581
IdRef : 122893980

M. Tareb-Reyes

Function : Author

G N. Taylor

Function : Author

S. Tereshchenko

Function : Author

A. Toropin

Function : Author

a M. Touchard

Function : Author

S N. Tovey

Function : Author

M T. Tran

Function : Author

E. Tsesmelis

Function : Author

J. Ulrichs

Function : Author

L. Vacavant

Function : Author

M. Valdata-Nappi

Function : Author

V. Valuev

Function : Author

Laboratoire d'Annecy de Physique des Particules

F. Vannucci

Function : Author

K E. Varvell

Function : Author

M. Veltri

Function : Author

V. Vercesi

Function : Author

J M. Vieira

Function : Author

T. Vinogradova

Function : Author

F. Weber

Function : Author

T. Weisse

Function : Author

F F. Wilson

Function : Author

L J. Winton

Function : Author

B D. Yabsley

Function : Author

H. Zaccone

Function : Author

K. Zuber

Function : Author

P. Zuccon

Function : Author

Abstract

The $\Lambda$ polarization in $\nu_\mu$ 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: $P_x (x_F 0) = -0.21 \pm 0.04 \mbox{(stat)} \pm 0.02 \mbox{(sys)}$. In the current fragmentation region we find $P_x (x_F 0) = -0.09 \pm 0.06 \mbox{(stat)} \pm 0.03 \mbox{(sys)}$. 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 $\Lambda$ production plane) has been observed for the first time in a neutrino experiment: $P_y = -0.22 \pm 0.03 \mbox{(stat)} \pm 0.01 \mbox{(sys)}$. 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 results from unpolarized hadron-hadron experiments.

Keywords

presuppositions about human communication epistemology

Domains

High Energy Physics - Experiment [hep-ex]

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Submitted on : Monday, November 20, 2000-1:59:54 PM

Last modification on : Thursday, April 11, 2024-1:18:11 PM

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in2p3-00006059 , version 1 (20-11-2000)

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HAL Id : in2p3-00006059 , version 1

Cite

P. Astier, D. Autiero, A. Baldisseri, M. Baldo-Ceolin, M. Banner, et al.. Measurement of the $\Lambda$ polarization in $\nu_\mu$ charged current interactions in the NOMAD experiment. Nuclear Physics B, 2000, 588, pp.3-36. ⟨in2p3-00006059⟩

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Measurement of the $\Lambda$ polarization in $\nu_\mu$ charged current interactions in the NOMAD experiment

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