Improved test of the flavor independence of strong interactions

Journal Article · Fri Jan 01 00:00:00 EST 1999 · Physical Review, D

OSTI ID:300167

Steiner, R ^[1]; Abe, K; Yuta, H ^[2]; Benvenuti, A C ^[3]; Allen, N J; Cotton, R; Dervan, P J; Hasan, A; McKemey, A K; Ward, C; Watts, S J ^[4]; Coller, J A; Hedges, S J; Shank, J T; Whitaker, J S ^[5]; DOliveira, A; Johnson, R A; Meadows, B T; Nussbaum, M ^[6]; Danielson, M N ; Fahey, S; Fan, C; Krishna, N M; Nauenberg, U; Wagner, D L; Williams, B ^[7]; Rowson, P C; Shaevitz, M H ^[8]; Dima, M; Harton, J L; Smy, M B; Staengle, H; Wilson, R J ^[9]; Camanzi, B; Mazzucato, E; Menegatti, G; Piemontese, L ^[10]; Calcaterra, A; de Sangro, R; Falciai, D; Peruzzi, I; Piccolo, M ^[11]; Eisenstein, B I; Gladding, G; Karliner, L ^[12]; Shapiro, G; Steiner, H ^[13]; Barakat, M B ^[14]; Baird, K G; Blaylock, G; Flood, K; Hertzbach, S S; Kofler, R R; Strauss, M G; Trandafir, A I; Wittlin, J L ^[15]; others, and

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1. Adelphi University, South Avenue, Garden City, New York 11530 (United States)
2. Aomori University, 2-3-1 Kohata, Aomori City, 030 (Japan)
3. INFN Sezione di Bologna, Via Irnerio 46, I-40126 Bologna (Italy)
4. Brunel University, Uxbridge, Middlesex, UB8 3PH (United Kingdom)
5. Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215 (United States)
6. University of Cincinnati, Cincinnati, Ohio 45221 (United States)
7. University of Colorado, Campus Box 390 Boulder, Colorado 80309 (United States)
8. Columbia University, Nevis Laboratories P.O. Box 137 Irvington, New York 10533 (United States)
9. Colorado State University, Fort Collins, Colorado 80523 (United States)
10. INFN Sezione di Ferrara, Via Paradiso 12, I-44100 Ferrara (Italy)
11. Laboratori Nazionali di Frascati, Casella Postale 13, I-00044 Frascati (Italy)
12. University of Illinois, 1110 West Green Street, Urbana, Illinois 61801 (United States)
13. Lawrence Berkeley Laboratory, Department of Physics 50B-5211, University of California, Berkeley, California 94720 (United States)
14. Louisiana Technical University, Ruston, Louisiana 71272 (United States)
15. University of Massachusetts, Amherst, Massachusetts 01003 (United States)

We present an improved comparison of the strong coupling of the gluon to light (q{sub l}=u+d+s), {ital c}, and {ital b} quarks, determined from multijet rates in flavor-tagged samples of hadronic Z{sup 0} decays recorded with the SLC Large Detector at the SLAC Linear Collider between 1993 and 1995. Flavor separation among primary q{sub l}{bar q}{sub l}, c{bar c}, and b{bar b} final states was made on the basis of the reconstructed mass of long-lived heavy-hadron decay vertices, yielding tags with high purity and low bias against {ge} 3-jet final states. We find: {alpha}{sub s}{sup c}/{alpha}{sub s}{sup uds}=1.036{plus_minus}0.043(stat){sub {minus}0.045}{sup +0.041}(syst){sub {minus}0.018}{sup +0.020}(theory) and {alpha}{sub s}{sup b}/{alpha}{sub s}{sup uds}=1.004{plus_minus}0.018(stat){sub {minus}0.031}{sup +0.026}(syst){sub {minus}0.029}{sup +0.018}(theory). {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 300167
• Journal Information: Physical Review, D, Vol. 59, Issue 1; Other Information: PBD: Jan 1999
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
QUANTUM CHROMODYNAMICS
Z NEUTRAL BOSONS
HADRONIC PARTICLE DECAY
INTERMEDIATE BOSONS
JET MODEL
STRONG INTERACTIONS
QUARKS
GLUONS
STANFORD LINEAR COLLIDER