Improved Direct Measurement Of The Parity-Violation Parameter A(B) Using A Mass Tag And Momentum-Weighted Track Charge

Abe Kenji,Abe Koya,Abe T,Adam I,Akimoto H,Aston D,Baird K G,Baltay C,Band H R,Barklow T L,Bauer J M,Bellodi G,Berger R,Blaylock G,Bogart J R,Bower G R, Brau J E,Breidenbach M,Bugg W M,Burke D, Burnett T H,Burrows P N,Calcaterra A,Cassell R,Chou A,Cohn H O,Coller J A,Convery M R,Cook V,Cowan R F,Crawford G,Damerell C J S,Daoudi M,de Groot N,de Sangro R,Dong D N,Doser M,Dubois R,Erofeeva I,Eschenburg V,Fahey S,Falciai D,Fernandez J P,Flood K,Frey R,Hart E L,Hasuko K,Hertzbach S S,Huffer M E,Huynh X,Iwasaki M,Jackson D J,Jacques P,Jaros J A,Jiang Z Y,Johnson A S,Johnson J R,Kajikawa R,Kalelkar M,Kang H J,Kofler R R,Kroeger R S,Langston M,Leith D W G,Lia V,Lin C,Mancinelli G,Manly S,Mantovani G,Markiewicz T W, Maruyama T,McKemey A K,Messner R,Moffeit K C,Moore T B,Morii M,Muller D,Murzin V, Narita S, Nauenberg U,Neal H,Nesom G,Oishi N,Onoprienko D,Osborne L S,Panvini R S,Park C H,Peruzzi I,Piccolo M,Piemontese L,Plano R J,Prepost R,Prescott C Y,Ratcliff B N,Reidy J,Reinertsen P L,Rochester L S,Rowson P C,Russell J J,Saxton O H,Schalk T,Schumm B A,Schwiening J,Serbo V V,Shapiro G,Sinev N B,Snyder J A,Staengle H,Stahl A,Stamer P,Steiner H,Su D,Suekane F,Sugiyama A, Suzuki S, Swartz M,Taylor F E, Thom J,Torrence E,Usher T,Va'vra J,Verdier R,Wagner D L,Waite A P,Walston S,Weidemann A W,Weiss E R,Whitaker J S,Williams S H,Willocq S,Wilson R J,Wisniewski W J,Wittlin J L,Woods M,Wright T R,Yamamoto R K,Yashima J,Yellin S J,Young C C,Yuta H, Null Null

PHYSICAL REVIEW LETTERS（2003）

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摘要

We present an improved direct measurement of the parity-violation parameter A(b) in the Z boson-b-quark coupling using a self-calibrating track-charge technique applied to a sample enriched in Z --> b (b) over bar events via the topological reconstruction of the B hadron mass. Manipulation of the Stanford Linear Collider electron-beam polarization permits the measurement of A(b) to be made independently of other Z-pole coupling parameters. From the 1996-1998 sample of 400 000 hadronic Z decays, produced with an average beam polarization of 73.4%, we find A(b) = 0.906 +/- 0.022(stat) +/- 0.023(syst).

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