Spin alignment of leading K*(892)degrees mesons in hadronic Z degrees decays

被引：42

作者：

Ackerstaff, K

Alexander, G

Allison, J

Altekamp, N

Anderson, KJ

Anderson, S

Arcelli, S

Asai, S

Axen, D

Azuelos, G

Ball, AH

Barberio, E

Barillari, T

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

Burckhardt, HJ

Burgard, C

Burgin, R

Capiluppi, P

Carnegie, RK

Carter, AA

Carter, JR

Chang, CY

Charlton, DG

Chrisman, D

Clarke, PEL

机构：

[1] UNIV BIRMINGHAM, SCH PHYS & SPACE RES, BIRMINGHAM B15 2TT, W MIDLANDS, ENGLAND

[2] UNIV BOLOGNA, DIPARTIMENTO FIS, I-40126 BOLOGNA, ITALY

[3] IST NAZL FIS NUCL, I-40126 BOLOGNA, ITALY

[4] UNIV BONN, INST PHYS, D-53115 BONN, GERMANY

[5] UNIV CALIF RIVERSIDE, DEPT PHYS, RIVERSIDE, CA 92521 USA

[6] UNIV CAMBRIDGE, CAVENDISH LAB, CAMBRIDGE CB3 0HE, ENGLAND

[7] CARLETON UNIV, DEPT PHYS, OTTAWA CARLETON INST PHYS, OTTAWA, ON K1S 5B6, CANADA

[8] CARLETON UNIV, CTR RES PARTICLE PHYS, OTTAWA, ON K1S 5B6, CANADA

[9] UNIV CHICAGO, ENRICO FERMI INST, CHICAGO, IL 60637 USA

[10] UNIV CHICAGO, DEPT PHYS, CHICAGO, IL 60637 USA

[11] UNIV FREIBURG, FAK PHYS, D-79104 FREIBURG, GERMANY

[12] UNIV HEIDELBERG, INST PHYS, D-69120 HEIDELBERG, GERMANY

[13] INDIANA UNIV, DEPT PHYS, BLOOMINGTON, IN 47405 USA

[14] UNIV LONDON QUEEN MARY & WESTFIELD COLL, LONDON E1 4NS, ENGLAND

[15] RHEIN WESTFAL TH AACHEN, INST PHYS 3, D-52056 AACHEN, GERMANY

[16] UCL, LONDON WC1E 6BT, ENGLAND

[17] UNIV MANCHESTER, SCHUSTER LAB, DEPT PHYS, MANCHESTER M13 9PL, LANCS, ENGLAND

[18] UNIV MARYLAND, DEPT PHYS, COLLEGE PK, MD 20742 USA

[19] UNIV MONTREAL, PHYS NUCL LAB, MONTREAL, PQ H3C 3J7, CANADA

[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] 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] INST NUCL RES, H-4001 DEBRECEN, HUNGARY

[40] NYU, DEPT PHYS, NEW YORK, NY 10003 USA

来源：

PHYSICS LETTERS B | 1997年 / 412卷 / 1-2期

关键词：

D O I：

10.1016/S0370-2693(97)01077-0

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Helicity density matrix elements for inclusive K*(892)(0) mesons from hadronic Z(0) decays have been measured over the full range of K*(0) momentum using data taken with the OPAL experiment at LEP. A preference for occupation of the helicity zero state is observed at all scaled momentum x(p) values above 0.3, with the matrix element rho(00) rising to 0.66+/-0.11 for x(p)>0.7. The values of the real part of the off-diagonal element rho(1-1) are negative at large x(p), with a weighted average value of -0.09+/-0.03 for x(p)>0.3, in agreement with new theoretical predictions based on Standard Model parameters and coherent fragmentation of the q (q) over bar system from the Z(0) decay. All other helicity density matrix elements measured are consistent with zero over the entire x(p) range. The K*(0) fragmentation function has also been measured and the total rate determined to be 0.74+/-0.02+/-0.02 K*(892)(0) mesons per hadronic Z(0) decay. (C) 1997 Published by Elsevier Science B.V.

引用

页码：210 / 224

页数：15

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