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

被引：94

作者：

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 ^{[1
]}

Silva, EDE

Dumarchez, J

Ellis, M

Fazio, T

Feldman, GJ

Ferrari, R

Ferrère, D

Flaminio, V

Fraternali, M

Gaillard, JM

Gangler, E

Geiser, A

Geppert, D

Gibin, D

Gninenko, S

Godley, A

Gomez-Cadenas, JJ

Gosset, J

机构：

[1] Univ Paris 06, LPNHE, Paris, France

[2] Univ Paris 07, Paris, France

[3] LAPP, Annecy, France

[4] Johns Hopkins Univ, Baltimore, MD 21218 USA

[5] Harvard Univ, Cambridge, MA 02138 USA

[6] Univ Calabria, I-87036 Cosenza, Italy

[7] Ist Nazl Fis Nucl, Cosenza, Italy

[8] Univ Dortmund, D-44221 Dortmund, Germany

[9] JINR, Dubna, Russia

[10] Univ Florence, Florence, Italy

[11] Ist Nazl Fis Nucl, I-50125 Florence, Italy

[12] CERN, Geneva, Switzerland

[13] Univ Lausanne, CH-1015 Lausanne, Switzerland

[14] Univ Calif Los Angeles, Los Angeles, CA 90024 USA

[15] Univ Melbourne, Parkville, Vic 3052, Australia

[16] Russian Acad Sci, Inst Nucl Res, Moscow, Russia

[17] Univ Padua, Padua, Italy

[18] Ist Nazl Fis Nucl, Padua, Italy

[19] Univ Pavia, I-27100 Pavia, Italy

[20] Ist Nazl Fis Nucl, I-27100 Pavia, Italy

[21] Univ Pisa, Pisa, Italy

[22] Ist Nazl Fis Nucl, Pisa, Italy

[23] Roma Tre Univ, Rome, Italy

[24] Ist Nazl Fis Nucl, Rome, Italy

[25] CEA Saclay, DAPNIA, Gif Sur Yvette, France

[26] Univ S Carolina, Columbia, SC 29208 USA

[27] Univ Sydney, Sydney, NSW 2006, Australia

[28] Univ Urbino, Florence, Italy

[29] Ist Nazl Fis Nucl, I-50125 Florence, Italy

[30] IFIC, Valencia, Spain

[31] Rudjer Boskovic Inst, Zagreb, Croatia

[32] ETH Zurich, Zurich, Switzerland

来源：

NUCLEAR PHYSICS B | 2000年 / 588卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

neutrino interactions; lambda polarization; nucleon spin; spin transfer;

D O I：

10.1016/S0550-3213(00)00503-4

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

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.

引用

页码：3 / 36

页数：34

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