학술논문
Measurement of the bb¯ fraction in hadronic Z0 decays with precision vertex detectors
Document Type
article
Author
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, JJ Gomez; Gratta, G; Hanson, G; Harr, R; Harral, B; Harris, FA; Hayes, K; Hearty, C; Heusch, CA; Hildreth, MD; Himel, T; Hinshaw, DA; Hong, SJ; Hutchinson, D; Hylen, J; Innes, WR; Jaros, JA; Jung, CK; Kadyk, JA; Kenney, C; King, M; Komamiya, S; Kowalski, LA; Kral, JF; Kuhlen, M; Labarga, L; Lankford, AJ; Le Diberder, F; Levi, ME; Litke, AM; Lou, XC; Lüth, V; McKenna, JA; Matthews, JAJ; Mattison, T; Moffeit, KC; Munger, CT; Murray, WN; Nash, J; Ogren, H; O’Shaughnessy, KF; Parker, SI; Peck, C; Perl, ML; Petradza, M; Pitthan, R; Porter, FC; Rankin, P; Rust, DR; Sadrozinski, HFW; Schwarz, AS; Seiden, A; Smith, JG; Snyder, A; Soderstrom, E; Stoker, DP; Stroynowski, R; Swartz, M; Thun, R; Trilling, GH
Source
Physical Review Letters. 67(24)
Subject
Language
Abstract
We have measured the fraction of bb» events in hadronic Z0 decays, Rbb», using the vertex detector system of the Mark II detector at the SLAC Linear Collider. We tag bb» 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 Rbb»=0.251+0.049+0.030, in good agreement with other measurements and the standard model prediction. © 1991 The American Physical Society.