Measurement of the parity-violation parameter {ital A}{sub {ital b}} from the left-right forward-backward asymmetry of {ital b} quark production in {ital Z}{sup 0} decays using a momentum-weighted track-charge technique

Journal Article · Mon Apr 10 00:00:00 EDT 1995 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.74.2890· OSTI ID:46391

Abe, K; Abt, I; Ahn, C J; Akagi, T; Ash, W W; Aston, D; Bacchetta, N; Baird, K G; Baltay, C; Band, H R; Barakat, M B; Baranko, G; Bardon, O; Barklow, T; Bazarko, A O; Ben-David, R; Benvenuti, A C; Bienz, T; Bilei, G M; Bisello, D ; Blaylock, G; Bogart, J R; Bolton, T; Bower, G R; Brau, J E; Breidenbach, M; Bugg, W M; Burke, D; Burnett, T H; Burrows, P N; Busza, W; Calcaterra, A; Caldwell, D O; Calloway, D; Camanzi, B; Carpinelli, M; Cassell, R; Castaldi, R; Castro, A; Cavalli-Sforza, M; Church, E; Cohn, H O; Coller, J A; Cook, V; Cotton, R; Cowan, R F; Coyne, D G; D`Oliveira, A; Damerell, C J.S.; Dasu, S; De Sangro, R; De Simone, P; Dell`Orso, R; Dima, M; Du, P Y.C.; Dubois, R; Eisenstein, B I; Elia, R; Falciai, D; Fan, C; Fero, M J; Frey, R; Furuno, K; Gillman, T; Gladding, G; Gonzalez, S; Hallewell, G D; Hart, E L; Hasegawa, Y; Hedges, S; Hertzbach, S S; Hildreth, M D; Huber, J; Huffer, M E; Hughes, E W; Hwang, H; Iwasaki, Y; Jacques, P; Jaros, J; Johnson, A S; Johnson, J R; Johnson, R A; Junk, T; Kajikawa, R; Kalelkar, M; Karliner, I; Kawahara, H; Kendall, H W; Kim, Y; King, M E; King, R; Kofler, R R; Krishna, N M; Kroeger, R S; Labs, J F; Langston, M; Lath, A; Lauber, J A; Leith, D W.G.; Liu, X; Loreti, M; Lu, A; Lynch, H L; Ma, J; Mancinelli, G; Manly, S; Mantovani, G; Markiewicz, T W; Maruyama, T; Massetti, R; Masuda, H; Mazzucato, E; McKemey, A K; Meadows, B T; Messner, R; Mockett, P M; Moffeit, K C; Mours, B; Mueller, G; Muller, D; Nagamine, T; Nauenberg, U; Neal, H; Nussbaum, M; Ohnishi, Y; Osborne, L S; Panvini, R S; Park, H; Pavel, T J; Peruzzi, I; Pescara, L; Piccolo, M; Piemontese, L; Pieroni, E; Pitts, K T; Plano, R J; Prepost, R; Prescott, C Y; Punkar, G D; Quigley, J; Ratcliff, B N; Reeves, T W; Rensing, P E; Rochester, L S; Rothberg, J E; Rowson, P C; Russell, J J; Saxton, O H; Schalk, T

Using an impact parameter tag to select an enriched sample of {ital Z}{sup 0}{r_arrow}{ital bb}{ovr bar} events, and the net momentum-weighted track charge to identify the sign of the charge of the underlying {ital b} quark, we have measured the left-right forward-backward asymmetry for {ital b} quark production as a function of polar angle. Based on 1.8pb{sup {minus}1} of {ital Z}{sup 0} decay data produced with a mean electron beam polarization of {ital P}{sub {ital e}}=63%, this yields a direct measurement of the extent of parity violation in the {ital Zbb} coupling of {ital A}{sub {ital b}}=0.87{plus_minus}0.11(stat){plus_minus}0.09(syst).

• OSTI ID: 46391
• Journal Information: Physical Review Letters, Vol. 74, Issue 15; Other Information: PBD: 10 Apr 1995
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
Z NEUTRAL BOSONS
PARTICLE DECAY
BEAUTY PARTICLES
PARTICLE PRODUCTION
PARITY
QUARKS
ASYMMETRY
VIOLATIONS
IMPACT PARAMETER
CHARGES
ELECTRON BEAMS
POLARIZATION
COUPLING