Production rates of b(b)over-bar quark pairs from gluons and b(b)over-barb(b)over-bar events in hadronic Z0 decays

被引：0

作者：

Abbiendi, G ^{[1
]}

Ackerstaff, K

Ainsley, C

Akesson, PF

Alexander, G

Allison, J

Anderson, KJ

Arcelli, S

Asai, S

Ashby, SF

Axen, D

Azuelos, G

Bailey, I

Ball, AH

Barberio, E

Barlow, RJ

Baumann, S

Behnke, T

Bell, KW

Bella, G

Bellerive, A

Bentvelsen, S

Bethke, S

Biebel, O

Bloodworth, IJ

Bock, P

Böhme, J

Boeriu, O

Bonacorsi, D

Boutemeur, M

Braibaut, S

Bright-Thomas, P

Brigliadori, L

Brown, RM

Burckhart, HJ

Cammin, J

Capiluppi, P

Carnegie, RK

Carter, AA

Carter, JR

Chang, CY

Charlton, DG

Ciocca, C

Clarke, PEL

Clay, E

Cohen, I

Cooke, OC

Couchman, J

Couyoumtzelis, C

Coxe, RL

机构：

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

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

[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, 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] 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] Tech Hsch Aachen, Inst Phys 3, D-52056 Aachen, Germany

[17] UCL, 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] CLRC, Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England

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

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

[25] Univ Tokyo, Int Ctr Elementary Particle Phys, Tokyo 1130033, Japan

[26] Univ Tokyo, Dept Phys, Tokyo 1130033, Japan

[27] Kobe Univ, Kobe, Hyogo 6578501, Japan

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

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

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

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

[37] Univ Min & Met Krakow, Krakow, Poland

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

[39] Max Planck Inst, Munich, Germany

来源：

EUROPEAN PHYSICAL JOURNAL C | 2001年 / 18卷 / 03期

关键词：

D O I：

10.1007/s100520100580

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 rates are measured per hadronic Z(0) decay for gluon splitting to b (b) over bar quark pairs, g(b (b) over bar), and of events containing two b (b) over bar quark pairs, g(4b), using a sample of four-jet events selected from data collected with the OPAL detector. Events with an enhanced signal of gluon splitting to b (b) over bar quarks are selected if two of the jets are close in phase-space and contain detached secondary vertices. For the event sample containing two b (b) over bar quark pairs, three of the four jets are required to have a significantly detached secondary vertex. Information from the event topology is combined in a likelihood fit to extract the values of g(b (b) over bar) and g(4b), namely g(b (b) over bar) = (3.07 +/- 0.53(stat) +/- 0.97(syst)) x 10(-3), g(4b) = (0.36 +/- 0.17(stat) +/- 0.27(syst)) x 10(-3).

引用

页码：447 / 460

页数：14

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