Polarization and forward-backward asymmetry of Λ baryons in hadronic Z0 decays

被引：0

作者：

Ackerstaff, K ^{[1
]}

Alexander, G

Allison, J

Altekamp, N

Anderson, KJ

Anderson, S

Arcelli, S

Asai, S

Axen, D

Azuelos, G

Ball, AH

Barberio, E

Barlow, RJ

Bartoldus, R

Batley, JR

Baumann, S

Bechtluft, J

Beeston, C

Behnke, T

Bell, AN

Bell, KW

Bella, G

Bentvelsen, S

Bethke, S

Biebel, O

Biguzzi, A

Bird, SD

Blobel, V

Bloodworth, IJ

Bloomer, JE

Bobinski, M

Bock, P

Bonacorsi, D

Boutemeur, M

Bouwens, BT

Braibant, S

Brigliadori, L

Brown, RM

Burckhart, HJ

Burgard, C

Burgin, R

Capiluppi, P

Carnegie, RK

Carter, AA

Carter, JR

Chang, CY

Charlton, DG

Chrisman, D

Clarke, PEL

Cohen, I

机构：

[1] CERN, European Lab Particle Phys, CH-1211 Geneva 23, Switzerland

[2] Univ Birmingham, Sch Phys & Space Res, Birmingham B15 2TT, W Midlands, England

[3] Ist Nazl Fis Nucl, I-40126 Bologna, Italy

[4] Univ Bologna, Dipartimento Fis, I-40126 Bologna, Italy

[5] Univ Bonn, Inst Phys, D-53115 Bonn, Germany

[6] Univ Calif Riverside, Dept Phys, Riverside, CA 92521 USA

[7] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[8] Carleton Univ, Dept Phys, Ottawa Carleton Inst Phys, Ottawa, ON K1S 5B6, Canada

[9] Carleton Univ, Ctr Res Particle Phys, Ottawa, ON K1S 5B6, Canada

[10] Univ Chicago, Dept Phys, Chicago, IL 60637 USA

[11] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

[12] Univ Freiburg, Fak Phys, D-79104 Freiburg, Germany

[13] Heidelberg Univ, Inst Phys, D-69120 Heidelberg, Germany

[14] Indiana Univ, Dept Phys, Bloomington, IN 47405 USA

[15] Queen Mary Univ London, London E1 4NS, England

[16] UCL, London WC1E 6BT, England

[17] Univ Manchester, Schuster Lab, Dept Phys, Manchester M13 9PL, Lancs, England

[18] Univ Montreal, Nucl Phys Lab, Quebec City, PQ H3C 3J7, Canada

[19] Univ Maryland, Dept Phys, College Pk, MD 20742 USA

[20] Univ Oregon, Dept Phys, Eugene, OR 97403 USA

[21] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England

[22] Technion Israel Inst Technol, Dept Phys, IL-32000 Haifa, Israel

[23] Tel Aviv Univ, Dept Phys & Astron, IL-69978 Tel Aviv, Israel

[24] Univ Tokyo, Dept Phys, Tokyo 113, Japan

[25] Univ Tokyo, Int Ctr Elementary Particle Phys, Tokyo 113, Japan

[26] Kobe Univ, Kobe, Hyogo 657, Japan

[27] Brunel Univ, Uxbridge UB8 3PH, Middx, England

[28] Weizmann Inst Sci, Particle Phys Dept, IL-76100 Rehovot, Israel

[29] Univ Hamburg, DESY, Inst Expt Phys 2, D-22607 Hamburg, Germany

[30] Univ Victoria, Dept Phys, Victoria, BC V8W 3P6, Canada

[31] Univ British Columbia, Dept Phys, Vancouver, BC V6T 1Z1, Canada

[32] Univ Alberta, Dept Phys, Edmonton, AB T6G 2J1, Canada

[33] Duke Univ, Dept Phys, Durham, NC 27708 USA

[34] Res Inst Particle & Nucl Phys, H-1525 Budapest, Hungary

[35] Inst Nucl Res, H-4001 Debrecen, Hungary

[36] Univ Munich, Sekt Phys, D-85748 Garching, Germany

[37] TRIUMF, Vancouver, BC V6T 2A3, Canada

[38] Lajos Kossuth Univ, Dept Expt Phys, Debrecen, Hungary

[39] NYU, Dept Phys, New York, NY USA

来源：

EUROPEAN PHYSICAL JOURNAL C | 1998年 / 2卷 / 01期

关键词：

D O I：

10.1007/s100520050123

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 longitudinal polarization, the transverse polarization, and the forward-backward asymmetry of A baryons, have been measured using a sample of 4.34 million hadronic Z(0) decays collected with the OPAL detector at LEP between 1990 and 1995. These results are important as an aid to the understanding of hadronization mechanisms. Significant longitudinal polarization has been observed at intermediate and high momentum. For x(E) (= 2(Lambda)/root s) > 0.3, the longitudinal polarization has been measured to be -32.9 +/- 5.5 (stat) +/- 5.2 (syst)%. We have observed no transverse polarization A significant forward backward asymmetry has been measured and can be described by a JETSET model.

引用

页码：49 / 59

页数：11

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