EVIDENCE FOR B-FLAVORED BARYON PRODUCTION IN Z(0)DECAYS AT LEP

被引：48

作者：

ACTON, PD

ALEXANDER, G

ALLISON, J

ALLPORT, PP

ANDERSON, KJ

ARCELLI, S

ASHTON, P

ASTBURY, A

AXEN, D

AZUELOS, G

BAHAN, GA

BAINES, JTM

BALL, AH

BANKS, J

BARKER, GJ

BARLOW, RJ

BATLEY, JR

BEAUDOIN, G

BECK, A

BECKER, J

BEHNKE, T

BELL, KW

BELLA, G

BERLICH, P

BETHKE, S

BIEBEL, O

BINDER, U

BLOODWORTH, IJ

BOCK, P

BODEN, B

BOSCH, HM

BOUGEROLLE, S

BRABSON, BB

BREUKER, H

BROWN, RM

BRUN, R

BUIJS, A

BURCKHART, HJ

CAPILUPPI, P

CARNEGIE, RK

CARTER, AA

CARTER, JR

CHANG, CY

CHARLTON, DG

CLARKE, PEL

COHEN, I

COLLINS, WJ

CONBOY, JE

COOPER, M

COUCH, M

机构：

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

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

[3] UNIV CAMBRIDGE,CAVENDISH LAB,CAMBRIDGE CB3 0HE,ENGLAND

[4] UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637

[5] UNIV CHICAGO,ENRICO FERMI INST,DEPT PHYS,CHICAGO,IL 60637

[6] UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY

[7] IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY

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

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

[10] UNIV MONTREAL,PHYS NUCL LAB,MONTREAL H3C 3J7,QUEBEC,CANADA

[11] UNIV MARYLAND,DEPT PHYS & ASTRON,COLLEGE PK,MD 20742

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

[13] UNIV FREIBURG,FAK PHYS,W-7800 FREIBURG,GERMANY

[14] UNIV HAMBURG,DESY,INST EXPTL PHYS 2,W-2000 HAMBURG 52,GERMANY

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

[16] UNIV HEIDELBERG,INST PHYS,W-6900 HEIDELBERG,GERMANY

[17] UNIV BONN,INST PHYS,W-5300 BONN 1,GERMANY

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

[19] INDIANA UNIV,DEPT PHYS,BLOOMINGTON,IN 47405

[20] CERN,EUROPEAN ORG PARTICLE PHYS,CH-1211 GENEVA 23,SWITZERLAND

[21] CARLETON UNIV,DEPT PHYS,OTTAWA K1S 5B6,ONTARIO,CANADA

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

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

[24] UNIV LONDON BIRKBECK COLL,LONDON WC1E 7HV,ENGLAND

[25] CENS,DEPT PHYS PARTICULES ELEMENT,F-91191 GIF SUR YVETTE,FRANCE

[26] UNIV CALIF RIVERSIDE,DEPT PHYS,RIVERSIDE,CA 92521

[27] CARLETON UNIV,CTR RES PARTICLE PHYS,OTTAWA K1S 5B6,ONTARIO,CANADA

[28] WEIZMANN INST SCI,DEPT NUCL PHYS,IL-76100 REHOVOT,ISRAEL

[29] UNIV TOKYO,INT CTR ELEMENTARY PARTICLE PHYS,TOKYO 113,JAPAN

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

[31] KOBE UNIV,KOBE 657,JAPAN

[32] NATL RES COUNCIL CANADA,HERZBERG INST ASTROPHYS,OTTAWA K1A 0R6,ONTARIO,CANADA

来源：

PHYSICS LETTERS B | 1992年 / 281卷 / 3-4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(92)91160-B

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We observe evidence for the production of b-flavoured baryons in decays of the Z0 boson with the OPAL detector at LEP. We find 68 LAMBDA-l-, LAMBDA-lBAR+ candidates and 13 LAMBDA-l+, LAMBDA-1BAR- candidates in 458 583 hadronic Z0 decays. We interpret this as a signal of 55 +/- 9(-3.1)+0.3 events from the semi-leptonic decays of b baryons. Assuming weakly decaying b baryons produced in Z0 decays are mostly LAMBDA(b) particles, we measure the product branching ratio (GAMMA(bbBAR)/GAMMA(had)) f (b --> LAMBDA(b)) B (LAMBDA(b) --> LAMBDA-l-nu-XBAR), averaged over the electron and muon channels, to be (6.2+/-1.0+/-1.5) x 10(-4).

引用

页码：394 / 404

页数：11

共 36 条

[1]

ABREU P, 1990, AUG SING C

[2]

ACTON PD, UNPUB PHYS LETT

[3] MEASUREMENTS OF Z0-]BBARB DECAYS AND THE SEMILEPTONIC BRANCHING RATIO BR(B-]L+X) [J].

ADEVA, B .

PHYSICS LETTERS B, 1991, 261 (1-2) :177-187

[4]

AHMET K, 1991, NUCL INSTRUM METH A, V305, P275

[5]

AKRAWY MZ, 1990, Z PHYS C PART FIELDS, V47, P505

[6]

AKRAWY MZ, 1991, Z PHYS C PART FIELDS, V49, P375, DOI 10.1007/BF01549689

[7] A STUDY OF HEAVY FLAVOR PRODUCTION USING MUONS IN HADRONIC Z0 DECAYS [J].

AKRAWY, MZ .

PHYSICS LETTERS B, 1991, 263 (02) :311-324

[8] 1ST OBSERVATION OF THE BEAUTY BARYON-LAMBDA-B IN THE DECAY CHANNEL LAMBDA-B-]J/PSI-LAMBDA AT THE CERN PROTON-ANTIPROTON COLLIDER [J].

ALBAJAR, C ;

ALBROW, MG ;

ALLKOFER, OC ;

ANKOVIAK, K ;

APSIMON, R ;

AUBERT, B ;

BACCI, C ;

BARTHA, S ;

BAUER, G ;

BETTINI, A ;

BEZAGUET, A ;

BIDDULPH, P ;

BOHN, H ;

BOHRER, A ;

BONINO, R ;

BOS, K ;

BOTLO, M ;

BROCKHAUSEN, D ;

BUCHANAN, C ;

BUSCHBECK, B ;

BUSETTO, G ;

CANER, A ;

CASOLI, P ;

CASTILLAVALDEZ, H ;

CAVANNA, F ;

CENNINI, P ;

CENTRO, S ;

CERADINI, F ;

CIAPETTI, G ;

CITTOLIN, S ;

CLAYTON, E ;

CLINE, D ;

COLAS, J ;

CONTE, R ;

COUGHLAN, JA ;

DAU, D ;

DAUM, C ;

DELLANEGRA, M ;

DEMOULIN, M ;

DENEGRI, D ;

DIBON, H ;

DICIACCIO, A ;

HEDO, FJD ;

DOBRZYNSKI, L ;

DORENBOSCH, J ;

DOWELL, JD ;

DRIJARD, D ;

EGGERT, K ;

EISENHANDLER, E ;

ELLIS, N .

PHYSICS LETTERS B, 1991, 273 (04) :540-548

[9] STUDY OF INCLUSIVE SEMILEPTONIC-B MESON DECAYS [J].

ALBRECHT, H .

PHYSICS LETTERS B, 1990, 249 (02) :359-365

[10] OBSERVATION OF THE CHARMED BARYON SIGMA-C IN E+E-ANNIHILATIONS [J].

ALBRECHT, H ;

BOCKMANN, P ;

GLASER, R ;

HARDER, G ;

KRUGER, A ;

NIPPE, A ;

SCHAFER, M ;

SCHMIDTPARZEFALL, W ;

SCHRODER, H ;

SCHULZ, HD ;

SEFKOW, F ;

SPENGLER, J ;

WURTH, R ;

YAGIL, A ;

APPUHN, RD ;

DRESCHER, A ;

KAMP, D ;

KOLANOSKI, H ;

MATTHIESEN, U ;

SCHECK, H ;

SCHWEDA, G ;

SPAAN, B ;

WALTHER, A ;

WEGENER, D ;

GABRIEL, JC ;

RUF, T ;

SCHUBERT, KR ;

STIEWE, J ;

STRAHL, K ;

WALDI, R ;

WERNER, S ;

EDWARDS, KW ;

FRISKEN, WR ;

GILKINSON, DJ ;

GINGRICH, DM ;

KAPITZA, H ;

KUTSCHKE, R ;

MACFARLANE, DB ;

MCLEAN, W ;

NILSSON, AW ;

ORR, RS ;

PARSONS, JA ;

PATEL, PM ;

PRENTICE, JD ;

SEIDEL, SC ;

SEYWERD, HGJ ;

SWAIN, JD ;

TSIPOLITIS, G ;

YOON, TS ;

AMMAR, R .

PHYSICS LETTERS B, 1988, 211 (04) :489-492

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