OBSERVATION OF SEMILEPTONIC CHARMLESS B-MESON DECAYS

被引：131

作者：

ALBRECHT, H

GLASER, R

HARDER, G

KRUGER, A

NILSSON, AW

NIPPE, A

OEST, T

REIDENBACH, M

SCHAFER, M

SCHMIDTPARZEFALL, W

SCHRODER, H

SCHULZ, HD

SEFKOW, F

WURTH, R

APPUHN, RD

DRESCHER, A

HAST, C

HERRERA, G

KOLANOSKI, H

LANGE, A

LINDNER, A

MANKEL, R

SCHECK, H

SCHWEDA, G

SPAAN, B

WALTHER, A

WEGENER, D

PAULINI, M

REIM, K

VOLLAND, U

WEGENER, H

FUNK, W

STIEWE, J

WERNER, S

BALL, S

GABRIEL, JC

GEYER, C

HOLSCHER, A

HOFMANN, W

HOLZER, B

KHAN, S

SPENGLER, J

CHARLESWORTH, CEK

EDWARDS, KW

FRISKEN, WR

KAPITZA, H

KRIEGER, P

KUTSCHKE, R

MACFARLANE, DB

MCLEAN, KW

机构：

[1] UNIV DORTMUND, INST PHYS, W-4600 DORTMUND, GERMANY

[2] UNIV ERLANGEN NURNBERG, INST PHYS CHEM, W-8520 ERLANGEN, GERMANY

[3] UNIV HEIDELBERG, INST HOCHENERGIEPHYS, W-6900 HEIDELBERG, GERMANY

[4] MAX PLANCK INST NUCL PHYS, W-6900 HEIDELBERG 1, GERMANY

[5] UNIV KANSAS, LAWRENCE, KS 66045 USA

[6] UNIV KARLSRUHE, INST EXPTL KERNPHYS, W-7500 KARLSRUHE, GERMANY

[7] UNIV LJUBLJANI, INST J STEFAN, YU-61111 LJUBLJANA, YUGOSLAVIA

[8] UNIV LJUBLJANI, ODDELEK FIZ, YU-61111 LJUBLJANA, YUGOSLAVIA

[9] UNIV LUND, INST PHYS, S-22362 LUND, SWEDEN

[10] MOSCOW THEORET & EXPTL PHYS INST, MOSCOW 117259, USSR

[11] UNIV S CAROLINA, COLUMBIA, SC 29208 USA

来源：

PHYSICS LETTERS B | 1990年 / 234卷 / 03期

基金：

美国国家科学基金会; 加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1016/0370-2693(90)91950-G

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A detailed study of the lepton momentum spectrum in υ(4S) decays has been made using the ARGUS detector at the DORIS II e+e- storage ring at DESY. In the region from 2.3 to 2.6 GeV/c, which is above the endpoint for contributions from B decays via b→c transitions, we observe 41±10 events in excess of known backgrounds. These events are interpreted as a signal for b→u transitions. A model dependent value of 0.10±0.01 is obtained for the ratio of Cabibbo-Kobayashi-Maskawa matrix elements |Vub|/|Vcv|, using the Altarelli et al. model. © 1990.

引用

页码：409 / 416

页数：8

共 17 条

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