The surprising thing is that arising almost 50 years ago from the linear sigma model （LSM） with spontaneously broken chiral symmetry, the light scalar meson problem has become central in the nonperturbative quantum ...The surprising thing is that arising almost 50 years ago from the linear sigma model （LSM） with spontaneously broken chiral symmetry, the light scalar meson problem has become central in the nonperturbative quantum chromodynamics （QCD） for it has been made clear that LSM could be the low energy realization of QCD. First we review briefly signs of four-quark nature of light scalars. Then we show that the light scalars are produced in the two photon collisions via four-quark transitions in contrast to the classic P wave tensor qq mesons that are produced via two-quark transitions γγ→qq. Thus we get new evidence of the four-quark nature of these states.展开更多
Abstract:We study the four-body decays of neutral flavored mesons,including■,and■.These processes,which could be induced by a hypothetical doubly-charged scalar particle,do not conserve the lepton number.Assuming,as...Abstract:We study the four-body decays of neutral flavored mesons,including■,and■.These processes,which could be induced by a hypothetical doubly-charged scalar particle,do not conserve the lepton number.Assuming,as an example,that the mass of the doubly-charged particle is 1000 Ge V,and using the upper bounds of the couplings,we calculate the branching ratios of different channels.For■,and■,it is of the order of 10^(-30),10^(-32)–10^(-29),and 10^(-33)–10^(-28),respectively.Based on the experimental results for the■channels,we also find the upper limit for the quantity■.展开更多
We construct a formalism that describes the resonances decaying into four pseudoscalar meson final states.This method is fully covariant and can be directly applied to the partial-wave analysis of high statistical dat...We construct a formalism that describes the resonances decaying into four pseudoscalar meson final states.This method is fully covariant and can be directly applied to the partial-wave analysis of high statistical data.Two topologies of the process are considered:two intermediate resonances,each decaying into two final mesons,and cascade decay via three meson intermediate states.In particular,we consider the production of such states in the central collision reactions and in radiative J/ψ decay.展开更多
基金Supported by RFFI Grant No.07-02-00093 from the Russian Foundation for Basic ResearchPresidential Grant No.NSh-1027.2008.2 for Leading Scientific Schools
文摘The surprising thing is that arising almost 50 years ago from the linear sigma model （LSM） with spontaneously broken chiral symmetry, the light scalar meson problem has become central in the nonperturbative quantum chromodynamics （QCD） for it has been made clear that LSM could be the low energy realization of QCD. First we review briefly signs of four-quark nature of light scalars. Then we show that the light scalars are produced in the two photon collisions via four-quark transitions in contrast to the classic P wave tensor qq mesons that are produced via two-quark transitions γγ→qq. Thus we get new evidence of the four-quark nature of these states.
基金Supported by National Natural Science Foundation of China(11405037,11575048,11505039)
文摘Abstract:We study the four-body decays of neutral flavored mesons,including■,and■.These processes,which could be induced by a hypothetical doubly-charged scalar particle,do not conserve the lepton number.Assuming,as an example,that the mass of the doubly-charged particle is 1000 Ge V,and using the upper bounds of the couplings,we calculate the branching ratios of different channels.For■,and■,it is of the order of 10^(-30),10^(-32)–10^(-29),and 10^(-33)–10^(-28),respectively.Based on the experimental results for the■channels,we also find the upper limit for the quantity■.
文摘We construct a formalism that describes the resonances decaying into four pseudoscalar meson final states.This method is fully covariant and can be directly applied to the partial-wave analysis of high statistical data.Two topologies of the process are considered:two intermediate resonances,each decaying into two final mesons,and cascade decay via three meson intermediate states.In particular,we consider the production of such states in the central collision reactions and in radiative J/ψ decay.
