MEASUREMENT OF THE BBAR FRACTION IN HADRONIC Z0 DECAYS WITH PRECISION VERTEX DETECTORS

被引：18

作者：

JACOBSEN, RG

KOETKE, DS

ADOLPHSEN, CE

FUJINO, D

SCHUMM, BA

WAGNER, SR

ALEXANDER, JP

AVERILL, D

BARISH, BC

BARKLOW, T

BARNETT, BA

BLOCKUS, D

BOYARSKI, A

BRABSON, B

BREAKSTONE, A

BULOS, F

BURCHAT, PR

BURKE, DL

CENCE, RJ

CHAPMAN, J

CHMEISSANI, M

CORDS, D

COUPAL, DP

DAUNCEY, P

DESTAEBLER, HC

DORFAN, JM

DRELL, PS

DREWER, DC

DURRETT, D

ELIA, R

FELDMAN, GJ

FIELD, RC

FORD, WT

FORDHAM, C

FREY, R

GAN, KK

GERO, E

GIDAL, G

GLANZMAN, T

GOLDHABER, G

CADENAS, JJG

GRATTA, G

HANSON, G

HARR, R

HARRAL, B

HARRIS, FA

HAYES, K

HEARTY, C

HEUSCH, CA

HILDRETH, MD

机构：

[1] UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720

[2] CALTECH,PASADENA,CA 91125

[3] JOHNS HOPKINS UNIV,BALTIMORE,MD 21218

[4] UNIV CALIF SANTA CRUZ,SANTA CRUZ,CA 95064

[5] UNIV MICHIGAN,ANN ARBOR,MI 48109

[6] INDIANA UNIV,BLOOMINGTON,IN 47405

[7] UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720

[8] UNIV HAWAII,HONOLULU,HI 96822

[9] UNIV COLORADO,BOULDER,CO 80309

来源：

PHYSICAL REVIEW LETTERS | 1991年 / 67卷 / 24期

关键词：

D O I：

10.1103/PhysRevLett.67.3347

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have measured the fraction of bbBAR events in hadronic Z0 decays, R(bbBAR), using the vertex detector system of the Mark II detector at the SLAC Linear Collider. We tag bbBAR events by requiring the coincidence of three or more tracks with significant impact parameters. This tag is 50% efficient and results in a sample of 85% purity. We find R(bbBAR) = 0.251 +/- 0.049 +/- 0.030, in good agreement with other measurements and the standard model prediction.

引用

页码：3347 / 3350

页数：4

共 24 条

[1] THE MARK-II DETECTOR FOR THE SLC [J].

ABRAMS, G ;

ADOLPHSEN, CE ;

AKERLOF, C ;

ALEXANDER, JP ;

ALVAREZ, M ;

AVERILL, D ;

BADEN, AR ;

BALLAM, J ;

BARISH, BC ;

BARKLOW, T ;

BARNETT, BA ;

BARTELT, J ;

BLOCKUS, D ;

DEBOER, W ;

BONVICINI, G ;

BOSWELL, C ;

BOYARSKI, A ;

BOYER, J ;

BRABSON, B ;

BRAUNE, K ;

BREAKSTONE, A ;

BROM, JM ;

BULOS, F ;

BURCHAT, PR ;

BURKE, DL ;

BUTLER, F ;

CALVINO, F ;

CENCE, RJ ;

CHAPMAN, J ;

CHMEISSANI, M ;

CORDS, D ;

COUPAL, DP ;

DAUNCEY, P ;

DESTAEBLER, HC ;

DORFAN, DE ;

DORFAN, JM ;

DRELL, PS ;

DREWER, DC ;

FAY, J ;

FELDMAN, GJ ;

FERNANDES, D ;

FERNANDEZ, E ;

FIELD, RC ;

FORD, WT ;

FORDHAM, C ;

FREY, R ;

FUJINO, D ;

GAN, KK ;

GATTO, C ;

GERO, E .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1989, 281 (01) :55-80

[2] MEASUREMENTS OF Z-BOSON RESONANCE PARAMETERS IN E+E- ANNIHILATION [J].

ABRAMS, GS ;

ADOLPHSEN, CE ;

AVERILL, D ;

BALLAM, J ;

BARISH, BC ;

BARKLOW, T ;

BARNETT, BA ;

BARTELT, J ;

BETHKE, S ;

BLOCKUS, D ;

BONVICINI, G ;

BOYARSKI, A ;

BRABSON, B ;

BREAKSTONE, A ;

BROM, JM ;

BULOS, F ;

BURCHAT, PR ;

BURKE, DL ;

CENCE, RJ ;

CHAPMAN, J ;

CHMEISSANI, M ;

CORDS, D ;

COUPAL, DP ;

DAUNCEY, P ;

DESTAEBLER, HC ;

DORFAN, DE ;

DORFAN, JM ;

DREWER, DC ;

ELIA, R ;

FELDMAN, GJ ;

FERNANDES, D ;

FIELD, RC ;

FORD, WT ;

FORDHAM, C ;

FREY, R ;

FUJINO, D ;

GAN, KK ;

GERO, E ;

GIDAL, G ;

GLANZMAN, T ;

GOLDHABER, G ;

CADENAS, JJG ;

GRATTA, G ;

GRINDHAMMER, G ;

GROSSEWIESMANN, P ;

HANSON, G ;

HARR, R ;

HARRAL, B ;

HARRIS, FA ;

HAWKES, CM .

PHYSICAL REVIEW LETTERS, 1989, 63 (20) :2173-2176

[3]

ABREU P, 1990, CERNPPE90118 REP

[4] 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

[5]

ADOLPHSEN C, 1991, SLACPUB5443 REP

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

AKRAWY, MZ .

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

[7] CHARGED-PARTICLE MULTIPLICITIES IN B-MESON DECAY [J].

ALAM, MS ;

CSORNA, SE ;

FRIDMAN, A ;

HICKS, RG ;

PANVINI, RS ;

ANDREWS, D ;

AVERY, P ;

BERKELMAN, K ;

CABENDA, R ;

CASSEL, DG ;

DEWIRE, JW ;

EHRLICH, R ;

FERGUSON, T ;

GILCHRIESE, MGD ;

GITTELMAN, B ;

HARTILL, DL ;

HERRUP, D ;

HERZLINGER, M ;

HOLZNER, S ;

KANDASWAMY, J ;

KREINICK, DL ;

MISTRY, NB ;

MORROW, F ;

NORDBERG, E ;

PERCHONOK, R ;

PLUNKETT, R ;

SILVERMAN, A ;

STEIN, PC ;

STONE, S ;

WEBER, D ;

WILCKE, R ;

SADOFF, AJ ;

BEBEK, C ;

HAGGERTY, J ;

HEMPSTEAD, M ;

IZEN, JM ;

LOOMIS, WA ;

MACKAY, WW ;

PIPKIN, FM ;

ROHLF, J ;

TANENBAUM, W ;

WILSON, R ;

CHADWICK, K ;

CHAUVEAU, J ;

GANCI, P ;

GENTILE, T ;

KAGAN, H ;

KASS, R ;

MELISSINOS, AC ;

OLSEN, SL .

PHYSICAL REVIEW LETTERS, 1982, 49 (06) :357-360

[8]

ALBRECHT H, 1991, DESY91092 REP

[9] THE MARK-II VERTEX DRIFT CHAMBER [J].

ALEXANDER, JP ;

BAGGS, R ;

FUJINO, D ;

HAYES, K ;

HOARD, C ;

HOWER, N ;

HUTCHINSON, D ;

JAROS, JA ;

KOETKE, D ;

KOWALSKI, LA ;

MUNGER, CT ;

OHAMA, T ;

PERL, ML ;

WRIGHT, R ;

DRELL, PS ;

FUZESY, R ;

HARR, R ;

KRAL, JF ;

RICHMAN, JD ;

SCHUMM, BA ;

TRILLING, GH ;

FORD, WT ;

HINSHAW, DA ;

SMITH, JG ;

WAGNER, SR ;

WEBER, P .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1989, 283 (03) :519-527

[10] A COMPARATIVE-STUDY OF COHERENT AND NONCOHERENT PARTON SHOWER EVOLUTION [J].

BENGTSSON, M ;

SJOSTRAND, T .

NUCLEAR PHYSICS B, 1987, 289 (3-4) :810-846

← 1 2 3 →