Isospin breaking and f(0)(980)-a(0)(980) mixing in the eta(1405) -> pi(0)f(0)(980) reaction

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	Isospin breaking and f(0)(980)-a(0)(980) mixing in the eta(1405) -> pi(0)f(0)(980) reaction
	Zou, BS
刊名	PHYSICAL REVIEW D
	2012
卷号	86 期号:11 页码:114007
关键词	CHIRAL PERTURBATION-THEORY PARTIAL-WAVE ANALYSIS MESON-EXCHANGE SCALAR MESONS DECAYS F(0)(980) DYNAMICS
ISSN号	1550-7998
通讯作者	Aceti, F (reprint author), Univ Valencia, CSIC, Ctr Mixto, Inst Invest Paterna,Dept Fis Teor, Apartado 22085, Valencia 46071, Spain.
英文摘要	We make a theoretical study of the eta(1405) -> pi(0)f(0)(980) and eta(1405) -> pi(0)a(0)(980) reactions with an aim to determine the isospin violation and the mixing of the f(0)(980) and a(0)(980) resonances. We make use of the chiral unitary approach where these two resonances appear as composite states of two mesons, dynamically generated by the meson-meson interaction provided by chiral Lagrangians. We obtain a very narrow shape for the f(0)(980) production in agreement with a BES experiment. As to the amount of isospin violation, or f(0)(980) and a(0)(980) mixing, assuming constant vertices for the primary eta(1405) -> pi K-0 (K) over bar and eta(1405) -> pi(0)pi(0)eta production, we find results which are much smaller than found in the recent experimental BES paper, but consistent with results found in two other related BES experiments. We have tried to understand this anomaly by assuming an I = 1 mixture in the eta(1405) wave function, but this leads to a much bigger width of the f(0)(980) mass distribution than observed experimentally. The problem is solved by using the primary production driven by eta' -> K(K) over bar followed by K -> K pi, which induces an extra singularity in the loop functions needed to produce the f(0)(980) and a(0)(980) resonances. Improving upon earlier work along the same lines, and using the chiral unitary approach, we can now predict absolute values for the ratio Gamma(pi(0), pi(+)pi(-))/Gamma(pi(0), pi(0)eta) which are in fair agreement with experiment. We also show that the same results hold if we had the eta(1475) resonance or a mixture of these two states, as seems to be the case in the BES experiment.
学科主题	Physics
收录类别	SCI
资助信息	DGICYT [FIS2011-28853-C02-01]; Generalitat Valenciana in the program Prometeo [2009/090]; EU [283286]; National Natural Science Foundation of China [11035006, 11261130311, 11165005]; DFG [CRC110]; NSFC; Chinese Academy of Sciences [KJCX2-EW-N01]; Ministry of Science and Technology of China [2009CB825200]; U.S. Department of Energy, Office of Nuclear Physics Division [DE-AC02-06CH11357]
原文出处	http://dx.doi.org/10.1103/PhysRevD.86.114007
语种	英语
WOS记录号	WOS:000311913000003
公开日期	2014-04-24
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/14960]
专题	理论物理研究所_理论物理所1978-2010年知识产出
推荐引用方式 GB/T 7714	Zou, BS. Isospin breaking and f(0)(980)-a(0)(980) mixing in the eta(1405) -> pi(0)f(0)(980) reaction[J]. PHYSICAL REVIEW D,2012,86(11):114007.
APA	Zou, BS.(2012).Isospin breaking and f(0)(980)-a(0)(980) mixing in the eta(1405) -> pi(0)f(0)(980) reaction.PHYSICAL REVIEW D,86(11),114007.
MLA	Zou, BS."Isospin breaking and f(0)(980)-a(0)(980) mixing in the eta(1405) -> pi(0)f(0)(980) reaction".PHYSICAL REVIEW D 86.11(2012):114007.