Observation of Y production in hadronic Z(0) decays

被引：21

作者：

Alexander, G ^{[25
]}

Allison, J

Altekamp, N

Ametewee, K

Anderson, KJ

Anderson, S

Arcelli, S

Asai, S

Axen, D

Azuelos, G

Ball, AH

Barberio, E

Barlow, RJ

Bartoldus, R

Batley, JR

Beaudoin, G

Bechtluft, J

Beck, GA

Beeston, C

Behnke, T

Bell, AN

Bell, KW

Bella, G

Bentvelsen, S

Berlich, P

Bethke, S

Biebel, O

Bloodworth, IJ

Bloomer, JE

Bock, P

Bosch, HM

Boutemeur, M

Bouwens, BT

Braibant, S

BrightThomas, P

Brown, RM

Burckhart, HJ

Burgard, C

Burgin, R

Capiluppi, P

Carnegie, RK

Carter, AA

Carter, JR

Chang, CY

Charlesworth, C

Charlton, DG

Chrisman, D

Chu, SL

Clarke, PEL

Clowes, SG

机构：

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

[2] UNIV BOLOGNA, DIPARTMENTO 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] CAVENDISH LAB, CAMBRIDGE CB3 OHE, ENGLAND

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

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

[9] CERN, EUROPEAN ORG NUCL RES, CH-1211 GENEVA 23, SWITZERLAND

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

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

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

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

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

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

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

[17] UNIV LONDON UNIV COLL, LONDON WC1E 6BT, ENGLAND

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

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

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

[21] UNIV OREGON, DEPT PHYS, EUGENE, OR 97403 USA

[22] RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND

[23] CTR ETUD SACLAY, CEA, DAPNIA, SPP, F-91191 GIF SUR YVETTE, FRANCE

[24] TECHNION ISRAEL INST TECHNOL, DEPT PHYS, IL-32000 HAIFA, ISRAEL

[25] TEL AVIV UNIV, DEPT PHYS & ASTRON, IL-69978 TEL AVIV, ISRAEL

[26] UNIV TOKYO, INT CTR ELEMENTARY PARTICEL PHYS, TOKYO 113, JAPAN

[27] UNIV TOKYO, DEPT PHYS, TOKYO 113, JAPAN

[28] KOBE UNIV, KOBE 657, JAPAN

[29] BRUNEL UNIV, UXBRIDGE UB8 3PH, MIDDX, ENGLAND

[30] WEIZMANN INST SCI, PARTICLE PHYS DEPT, IL-76100 REHOVOT, ISRAEL

[31] UNIV HAMBURG, DESY, INST EXPTL PHYS 2, D-22607 HAMBURG, GERMANY

[32] UNIV VICTORIA, DEPT PHYS, VICTORIA, BC V8W 3P6, CANADA

[33] UNIV BRITISH COLUMBIA, DEPT PHYS, VANCOUVER, BC V6T 1Z1, CANADA

[34] UNIV ALBERTA, DEPT PHYS, EDMONTON, AB T6G 2J1, CANADA

[35] DUKE UNIV, DEPT PHYS, DURHAM, NC 27708 USA

[36] RES INST PARTICLE & NUCL PHYS, H-1525 BUDAPEST, HUNGARY

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

[38] TRIUMF, VANCOUVER, BC V6T 2A3, CANADA

来源：

PHYSICS LETTERS B | 1996年 / 370卷 / 1-2期

关键词：

D O I：

10.1016/0370-2693(96)00070-6

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Evidence for the production of Upsilon mesons in hadronic Z(0) decays is presented. Using a sample of 3.7 million hadronic events, eight Upsilon candidates are identified from their decays into e(+)e(-) and mu(+)mu(-) pairs. The estimated background in the signal region is 1.6 +/- 0.3 events. Based on existing theoretical models for inclusive Upsilon production, the following branching ratio, summed over the three lightest Upsilon states, is obtained: Br(Z(0) --> Upsilon + X) = (1.0 +/- 0.4 +/- 0.1 +/- 0.2) x 10(-4), where the first error is statistical, the second systematic and the third error accounts for uncertainties in the production mechanism.

引用

页码：185 / 194

页数：10

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