First direct measurement of the parity-violating coupling of the Z0 to the s quark

First direct measurement of the parity-violating coupling of the Z0 to the s quark

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We present the first direct measurement of As, the parity-violating coupling of the Z0 boson to the strange quark, using ∼550 000 e+e- → Z0 → hadrons events recorded by the SLC Large Detector with a polarized e- beam. We tagged Z0 → ss̄ events by the absence of B or D hadrons and the presence in eac...

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Chi tiết về thư mục
Những tác giả chính: Abe, K, Abe, T, Adam, I, Akimoto, H, Aston, D, Baird, K, Baltay, C, Band, H, Barklow, T, Bauer, J, Bellodi, G, Berger, R, Blaylock, G, Bogart, JR, Bower, G, Brau, J, Breidenbach, M, Bugg, WM, Burke, D, Burnett, T, Burrows, P, Calcaterra, A, Cassell, R, Chou, A
Định dạng: Journal article
Ngôn ngữ:English
Được phát hành: 2000
Miêu tả
Tóm tắt:We present the first direct measurement of As, the parity-violating coupling of the Z0 boson to the strange quark, using ∼550 000 e+e- → Z0 → hadrons events recorded by the SLC Large Detector with a polarized e- beam. We tagged Z0 → ss̄ events by the absence of B or D hadrons and the presence in each hemisphere of a high momentum K± or Ks0. Fitting the polar angle distributions of the strangeness-signed thrust axis gave As = 0.895 ± 0.066(stat) ± 0.062(syst). The analyzing power and uū + dd̄ background were constrained using the data, greatly reducing any model dependence. © 2000 The American Physical Society.

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