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题名: Isospin breaking and f(0)(980)-a(0)(980) mixing in the eta(1405) -> pi(0)f(0)(980) reaction
作者: Aceti, F ;  Liang, WH ;  Oset, E ;  Wu, JJ ;  Zou, BS
刊名: PHYSICAL REVIEW D
出版日期: 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
学科分类: Physics
通讯作者: Aceti, F (reprint author), Univ Valencia, CSIC, Ctr Mixto, Inst Invest Paterna,Dept Fis Teor, Apartado 22085, Valencia 46071, Spain.
部门归属: [Aceti, F.; Oset, E.] Univ Valencia, CSIC, Ctr Mixto, Inst Invest Paterna,Dept Fis Teor, Valencia 46071, Spain; [Aceti, F.; Oset, E.] Univ Valencia, CSIC, Ctr Mixto, IFIC,Inst Invest Paterna, Valencia 46071, Spain; [Liang, W. H.] Guangxi Normal Univ, Dept Phys, Guilin 541004, Peoples R China; [Wu, J. J.] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA; [Zou, B. S.] Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China; [Zou, B. S.] Chinese Acad Sci, Inst High Energy Phys, Theoret Phys Ctr Sci Facil, Beijing 100049, Peoples R China
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.
资助者: 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]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000311913000003
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/14960
Appears in Collections:理论物理所2012年知识产出_期刊论文

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Recommended Citation:
Aceti, F,Liang, WH,Oset, E,et al. 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.
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