Measurement of |Vcb| using (B)over-bar0→D*+l-(ν)over-bar decays

被引：46

作者：

Abbiendi, G ^{[1
]}

Ackerstaff, K

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

Batley, JR

Baumann, S

Behnke, T

Bell, KW

Bella, G

Bellerive, A

Bentvelsen, S

Bethke, S

Biebel, O

Biguzzi, A

Bloodworth, IJ

Bock, P

Böhme, J

Boeriu, O

Bonacorsi, D

Boutemeur, M

Braibant, S

Bright-Thomas, P

Brigliadori, L

Brown, RM

Burckhart, HJ

Cammin, J

Capiluppi, P

Carnegie, RK

Carter, AA

Carter, JR

Chang, CY

Charlton, DG

Chrisman, D

Ciocca, C

Clarke, PEL

Clay, E

Cohen, I

Cooke, OC

Couchman, J

机构：

[1] Univ Bologna, Dipartimento 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, Dept Phys, Ottawa Carleton Inst Phys, Ottawa, ON K1S 5B6, Canada

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

[9] CERN, European Lab Particle Phys, 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] Rhein Westfal TH 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, Nucl Phys Lab, Montreal, PQ H3C 3J7, Canada

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

[22] Rutherford Appleton Lab, CLRC, 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

来源：

PHYSICS LETTERS B | 2000年 / 482卷 / 1-3期

关键词：

D O I：

10.1016/S0370-2693(00)00457-3

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The magnitude of the Cabibbo-Kobayashi-Maskawa matrix element V-cb has been measured using (B) over bar(0) --> D*(+)l(-)(v) over bar decays recorded on the Z(0) peak using the OPAL detector at LEP. The D*(+) --> D(0)pi(+) decays were reconstructed both in the particular decay modes D*(+) --> D(0)pi(+) and D*(+) --> D(0)pi(+)pi(0) and via an inclusive technique. The product of \V-cb\ and the decay form factor of the (B) over bar(0) --> D*(+)l(-)(v) over bar transition at zero recoil F(1) was measured to be F(1)\V-cb\ = (37.1 +/- 1.0 +/- 2.0) x 10(-3), where the uncertainties are statistical and systematic respectively. By using Heavy Quark Effective Theory calculations for F(1), a value of \V-cb\ = (40.7 +/- 1.1 +/- 2.2 +/- 1.6) x 10(-3) was obtained. where the third error is due to theoretical uncertainties in the value of F(1). The branching ratio Br((B) over bar(0) --> D*(+)l(-)(v) over bar) was also measured to be (5.26 +/- 0.20 +/- 0.46)%. (C) 2000 Published by Elsevier Science B.V. All rights reserved.

引用

页码：15 / 30

页数：16

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