A study of charm and anti-charm production in beauty decays with the OPAL detector at LEP

被引：0

作者：

Abbiendi, G ^{[1
]}

Ainsley, C

Åkesson, PF

Alexander, G

Allison, J

Amaral, P

Anagnostou, G

Anderson, KJ

Arcelli, S

Asai, S

Axen, D

Azuelos, G

Bailey, I

Barberio, E

Barlow, RJ

Batley, RJ

Bechtle, P

Behnke, T

Bell, KW

Bell, PJ

Bella, G

Bellerive, A

Benelli, G

Bethke, S

Biebel, O

Boeriu, O

Bock, P

Boutemeur, M

Braibant, S

Brigliadori, L

Buesser, RM

Brown, RM

Burckhart, HJ

Campana, S

Carnegie, RK

Caron, B

Carter, AA

Carter, JR

Chang, CY

Charlton, DG

Csilling, A

Cuffiani, M

Dado, S

De Roeck, A

De Wolf, EA

Desch, K

Dienes, B

Donkers, M

Dubbert, J

Duchovni, E

机构：

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

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

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

[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] CERN, European Org Nucl Res, CH-1211 Geneva 23, Switzerland

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

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

[14] Queen Mary Univ London, 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, Int Ctr Elementary Particle Phys, Tokyo 1130033, Japan

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

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

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

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

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

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

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

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

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

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

[35] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

[36] Yale Univ, Dept Phys, New Haven, CT 06520 USA

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

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

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

[40] MPI Munchen, Munich, Germany

[41] CERN, Div EP, CH-1211 Geneva 23, Switzerland

[42] Univ Manchester, Manchester M13 9PL, Lancs, England

[43] High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki, Japan

来源：

EUROPEAN PHYSICAL JOURNAL C | 2004年 / 35卷 / 02期

关键词：

D O I：

10.1140/epjc/s2004-01810-9

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 branching ratio of beauty hadrons to final states containing two charm hadrons, Br(b-->D (D) over barX), has been measured using an inclusive method in hadronic Z(0) decays with the OPAL detector at LEP. The impact parameter significance of tracks opposite tagged b-jets is used to differentiate b-->D (D) over barX decays from other decays. The result is Br(b-->D (D) over barX) = (10.0 +/- 3.2 (stat.)(-2.9)(+2.4)(det.)(-9.0)(+10.4) (phys.))%, where "det." is the systematic uncertainty due to the modelling of the detector, and "phys." is the systematic uncertainty due to the modelling of the underlying physics. Using this result, the average number of charm plus anti-charm quarks produced in a beauty quark decay, n(c), is found to be 1.12(-0.10)(+0.11).

引用

页码：149 / 158

页数：10

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