陶子衰变至六个π介子和一个中微子的研究。

Study of tau decays to six pions and a neutrino.

作者信息

Anastassov A, Duboscq J E, Eckhart E, Gan K K, Gwon C, Hart T, Honscheid K, Hufnagel D, Kagan H, Kass R, Pedlar T K, Schwarthoff H, Thayer J B, von Toerne E, Zoeller M M, Richichi S J, Severini H, Skubic P, Undrus A, Chen S, Fast J, Hinson J W, Lee J, Miller D H, Shibata E I, Shipsey I P, Pavlunin V, Cronin-Hennessy D, Lyon A L, Thorndike E H, Jessop C P, Savinov V, Coan T E, Fadeyev V, Maravin Y, Narsky I, Stroynowski R, Ye J, Wlodek T, Artuso M, Ayad R, Boulahouache C, Bukin K, Dambasuren E, Karamov S, Majumder G, Moneti G C, Mountain R, Schuh S, Skwarnicki T, Stone S, Viehhauser G, Wang J C, Wolf A, Wu J, Kopp S, Mahmood A H, Csorna S E, Danko I, McLean K W, Xu Z, Godang R, Bonvicini G, Cinabro D, Dubrovin M, McGee S, Zhou G J, Lipeles E, Pappas S P, Schmidtler M, Shapiro A, Sun W M, Weinstein A J, Würthwein F, Jaffe D E, Masek G, Paar H P, Potter E M, Prell S, Asner D M, Eppich A, Hill T S, Morrison R J, Briere R A, Chen G P, Ford W T, Gritsan A, Roy J, Smith J G, Alexander J P, Baker R, Bebek C, Berger B E, Berkelman K, Blanc F, Boisvert V, Cassel D G, Drell P S, Ecklund K M, Ehrlich R, Foland A D, Gaidarev P, Galik R S, Gibbons L, Gittelman B, Gray S W, Hartill D L, Heltsley B K, Hopman P I, Hsu L, Jones C D, Kreinick D L, Lohner M, Magerkurth A, Meyer T O, Mistry N B, Nordberg E, Patterson J R, Peterson D, Riley D, Romano A, Thayer J G, Urner D, Valant-Spaight B, Warburton A, Avery P, Prescott C, Rubiera A I, Stoeck H, Yelton J, Brandenburg G, Ershov A, Gao Y S, Kim D Y, Wilson R, Bergfeld T, Eisenstein B I, Ernst J, Gladding G E, Gollin G D, Hans R M, Johnson E, Karliner I, Marsh M A, Palmer M, Plager C, Sedlack C, Selen M, Thaler J J, Williams J, Edwards K W, Janicek R, Patel P M, Sadoff A J, Ammar R, Bean A, Besson D, Zhao X, Anderson S, Frolov V V, Kubota Y, Lee S J, Mahapatra R, O'Neill J J, Poling R, Riehle T, Smith A, Stepaniak C J, Urheim J, Ahmed S, Alam M S, Athar S B, Jian L, Ling L, Saleem M, Timm S, Wappler F

机构信息

Ohio State University, Columbus, Ohio 43210, USA.

出版信息

Phys Rev Lett. 2001 May 14;86(20):4467-71. doi: 10.1103/PhysRevLett.86.4467.

DOI:10.1103/PhysRevLett.86.4467

PMID:11384261

Abstract

The tau decays to six-pion final states have been studied with the CLEO detector at the Cornell Electron Storage Ring. The measured branching fractions are B(tau(-)-->2pi(-)pi(+)3pi(0)nu(tau)) = (2.2+/-0.3+/-0.4)x10(-4) and B(tau(-)-->3pi(-)2pi(+)pi(0)nu(tau)) = (1.7+/-0.2+/-0.2)x10(-4). A search for substructure in these decays shows that they are saturated by intermediate states with eta or omega mesons. We present the first observation of the decay tau(-)-->2pi(-)pi(+)omega(nu)tau and the branching fraction is measured to be (1.2+/-0.2+/-0.1)x10(-4). The measured branching fractions are in good agreement with the isospin expectations but somewhat below the conserved-vector-current predictions.

摘要

利用康奈尔电子储存环上的CLEO探测器对τ轻子衰变为六π末态的过程进行了研究。测得的分支比为B(τ⁻→2π⁻π⁺3π⁰ντ) = (2.2±0.3±0.4)×10⁻⁴和B(τ⁻→3π⁻2π⁺π⁰ντ) = (1.7±0.2±0.2)×10⁻⁴。对这些衰变中的子结构进行的搜寻表明，它们被含有η或ω介子的中间态所饱和。我们首次观测到了衰变τ⁻→2π⁻π⁺ω(ν)τ，测得的分支比为(1.2±0.2±0.1)×10⁻⁴。测得的分支比与同位旋预期相符，但略低于守恒矢量流的预测值。