首页 | 本学科首页   官方微博 | 高级检索  
     检索      


In search of scalar gluonium
Authors:VA Novikov  MA Shifman  AI Vainshtein  VI Zakharov
Institution:Institute of Theoretical and Experimental Physics, Moscow 117259, USSR
Abstract:We discuss a scalar meson coupled strongly to gluons. Radiative decays of the J/ψ are taken as a source of gluons so that our aim is to calculate Γ(J/ψσγ), where σ is the presumed scalar gluonium. We use QCD sum rules to find both 〈0|αsGμνaGμνa|σ〉 (where Gμνa is the gluon field strength tensor) and Γ(J/ψσγ) in terms of 〈0|αsGμνaGμνa|σ〉. The final prediction for the width is expected to be valid within a factor of two and gives Γ(J/ψ→σγ→two pions in S-wave + γ) ? 25 eV for mσ = 700 MeV. Non-perturbative QCD naturally explains the observed asymmetry between scalar and pseudoscalar states in the radiative decays of the J/ψ. Some general remarks on gluonium in QCD are made.
Keywords:
本文献已被 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号