Measurement of the tau Michel parameters (eta)over-bar and xi kappa in the radiative leptonic decay tau(-) -> l(-)nu(tau)(nu)over-bar(l)gamma

doi:10.1093/ptep/pty003

	Measurement of the tau Michel parameters (eta)over-bar and xi kappa in the radiative leptonic decay tau(-) -> l(-)nu(tau)(nu)over-bar(l)gamma
	Schw; Yuan ZZ(苑长征); 王平(实); Li LK(李龙科); Zupanc, A; Zhulanov, V; Zhukova, V; Zhilich, V; Zhang, ZP; Yuan, CZ
刊名	PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS
	2018
期号	2 页码:023C01
ISSN号	2050-3911
DOI	10.1093/ptep/pty003
文献子类	Article
英文摘要	We present a measurement of the Michel parameters of the tau lepton, (eta) over bar and xi kappa, in the radiative leptonic decay tau(-) -> l(-)nu(tau)(nu) over bar (l)gamma using 711 fb(-1) of collision data collected with the Belle detector at the KEKB e(+)e(-) collider. The Michel parameters are measured in an unbinned maximum likelihood fit to the kinematic distribution of e(+)e(-) -> tau(+)tau(-) -> (pi(+)pi(0)(nu) over bar (tau))(l(-)nu(tau)(nu) over bar (l)gamma) (l = e or mu). The measured values of the Michel parameters are (eta) over bar = - 1.3 +/- 1.5 +/- 0.8 and xi kappa = 0.5 +/- 0.4 +/- 0.2, where the first error is statistical and the second is systematic. This is the first measurement of these parameters. These results are consistent with the Standard Model predictions within their uncertainties, and constrain the coupling constants of the generalized weak interaction.
WOS关键词	MU-MESON DECAY ; BELLE DETECTOR ; IDENTIFICATION ; ANNIHILATION ; LIBRARY ; TRIGGER ; KEKB
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000427011100011
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/285716]
专题	高能物理研究所_实验物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Schw,Yuan ZZ,Wang P,et al. Measurement of the tau Michel parameters (eta)over-bar and xi kappa in the radiative leptonic decay tau(-) -> l(-)nu(tau)(nu)over-bar(l)gamma[J]. PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS,2018(2):023C01.
APA	Schw.,苑长征.,王平.,李龙科.,Zupanc, A.,...&Shimizu, N.(2018).Measurement of the tau Michel parameters (eta)over-bar and xi kappa in the radiative leptonic decay tau(-) -> l(-)nu(tau)(nu)over-bar(l)gamma.PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS(2),023C01.
MLA	Schw,et al."Measurement of the tau Michel parameters (eta)over-bar and xi kappa in the radiative leptonic decay tau(-) -> l(-)nu(tau)(nu)over-bar(l)gamma".PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS .2(2018):023C01.