Improved Measurement of the Left-Right {ital Z}{sup 0} Cross Section Asymmetry

Journal Article · Sat Mar 01 00:00:00 EST 1997 · Physical Review Letters

OSTI ID:524404

Steiner, R ^[1]; Benvenuti, A ^[2]; Coller, J; Hedges, S; Johnson, A; Shank, J; Whitaker, J ^[3]; Allen, N J; Cotton, R; Dervan, P; Hasan, A; McKemey, A; Watts, S ^[4]; Caldwell, D; Lu, A; Yellin, S ^[5]; Cavalli-Sforza, M; Coyne, D; Liu, X; Reinertsen, P ; Schalk, T; Schumm, B; Williams, D ^[6]; DOliveira, A; Johnson, R; Meadows, B; Nussbaum, M ^[7]; Dima, M; Harton, J; Smy, M; Wilson, R ^[8]; Baranko, G; Fahey, S; Fan, C; Krishna, N; Lauber, J; Nauenberg, U; Wagner, D ^[9]; Bazarko, A; Bolton, T; Rowson, P; Shaevitz, M ^[10]; Camanzi, B; Mazzucato, E; Piemontese, L ^[11]; Calcaterra, A; De Sangro, R; Peruzzi, I; Piccolo, M ^[12]; Abt, I; Eisenstein, B; Gladding, G; Karliner, I ^[13]; Shapiro, G; Steiner, H ^[14]; Bardon, O; Burrows, P; Busza, W; Cowan, R; Dong, D; Fero, M; Gonzalez, S; Kendall, H; Lath, A; Lia, V; Osborne, L; Quigley, J; Taylor, F; Torrence, E; Verdier, R; Williams, D; Yamamoto, R; Yamartino, J

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1. Adelphi University, Garden City, New York 11530 (United States)
2. INFN Sezione di Bologna, I-40126, Bologna (Italy)
3. Boston University, Boston, Massachusetts 02215 (United States)
4. Brunel University, Uxbridge, Middlesex, UB8 3PH (United Kingdom)
5. University of California at Santa Barbara, Santa Barbara, California 93106 (United States)
6. University of California at Santa Cruz, Santa Cruz, California 95064 (United States)
7. University of Cincinnati, Cincinnati, Ohio 45221 (United States)
8. Colorado State University, Fort Collins, Colorado 80523 (United States)
9. University of Colorado, Boulder, Colorado 80309 (United States)
10. Columbia University, New York, New York 10027 (United States)
11. INFN Sezione di Ferrara and Universita de Ferrara, I-44100 Ferrara (Italy)
12. INFN Lab.Nazionali di Frascati, I-00044 Frascati (Italy)
13. University of Illinois, Urbana, Illinois 61801 (United States)
14. Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720 (United States)

We present a new measurement of the left-right cross section asymmetry (A{sub LR}) for Z boson production by e{sup +}e{sup -} collisions. The measurement was performed at a center-of-mass energy of 91.28GeV with the SLD detector at the SLAC Linear Collider (SLC). The luminosity-weighted average polarization of the SLC electron beam was (77.23{plus_minus}0.52){percent}. Using a sample of 93644 Z decays, we measure the pole value of the asymmetry, A{sup 0}{sub LR}, to be 0.1512{plus_minus}0.0042(stat){plus_minus}0.00 11(syst), which is equivalent to an effective weak mixing angle of sin{sup 2}{theta}{sup eff}{sub W}=0.23100{plus_minus}0.00054(stat) {plus_minus}0.00014(syst). {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 524404
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 11 Vol. 78; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ASYMMETRY
CROSS SECTIONS
ELECTRON BEAMS
ELECTRON-POSITRON INTERACTIONS
MIXING
PARTICLE PRODUCTION
POLARIZATION
STANFORD LINEAR COLLIDER
Z NEUTRAL BOSONS