منابع مشابه
Gaussian Sum-Rules, Scalar Gluonium, and Instantons
Gaussian sum-rules relate a QCD prediction to a two-parameter Gaussian-weighted integral of a hadronic spectral function, providing a clear conceptual connection to quarkhadron duality. In contrast to Laplace sum-rules, the Gaussian sum-rules exhibit enhanced sensitivity to excited states of the hadronic spectral function. The formulation of Gaussian sum-rules and associated analysis techniques...
متن کاملA scalar gluonium contribution to K → ππ decay
We study a new K → ππ decay channel with gluons in intermediate state which is normally neglected within the factorization framework. Both short-distance and long-distance parts of the amplitude are calculated. The chiral Lagrangian approach is used for obtaining the long-distance contribution. The nonperturbative contribution gives an additional enhancement to K → ππ decay amplitude with ∆I = ...
متن کاملGaussian Sum-Rule Analysis of Scalar Gluonium and Quark Mesons
Gaussian sum-rules, which are related to a two-parameter Gaussian-weighted integral of a hadronic spectral function, are able to examine the possibility that more than one resonance makes a significant contribution to the spectral function. The Gaussian sum-rules, including instanton effects, for scalar gluonic and non-strange scalar quark currents clearly indicate a distribution of the resonan...
متن کاملTwo Topics in QCD Sum-Rules: Bounds on Light Quark and Scalar Gluonium Masses
QCD Laplace sum-rules are briefly reviewed and two sum-rule applications are presented. For scalar gluonium, upper bounds on the lightest state are obtained from ratios of Laplace sum-rules, and the role of instantons and the low-energy theorem on these bounds is investigated. For the light-quark masses, fundamental inequalities for Laplace sum-rules are developed, which lead to a lower bound o...
متن کاملObservable Consequences of a Scalar Boson Coupled Only to Neutrinos
We have examined the consequences of assuming the existence of a light scalar boson, weakly coupled to neutrinos, and not coupled to any other light fermions. For a range of parameters, we find that this hypothesis leads to the development of neutrino clusters which form in the early Universe and which provide gravitational fluctuations on scales small compared to a parsec (i.e., the scale of s...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1985
ISSN: 0370-2693
DOI: 10.1016/0370-2693(85)91013-5