63 research outputs found

    New Renormalization Group Equations and the Naturalness Problem

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    Looking for an observable manifestation of the so-called unnaturalness of scalar fields we introduce a seemingly new set of differential equations for connected Green functions. These equations describe the momentum dependence of the Green functions and are close relatives to the previously known renormalization group equations. Applying the new equations to the theory of scalar field with ϕ4\phi^4 interaction we identify a relation between the four-point Green function and the propagator which expresses the unnaturalness of the scalar field. Possible manifestations of the unnaturalness at low momenta are briefly discussed.Comment: 12 revtex pages; a coefficient has been corrected in eq. (34), four new references added; final version to appear in Phys. Rev.

    Spin alignment of K∗(892)±K^*(892)^\pm mesons produced in neutron-carbon interactions

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    A new precise measurements of spin density matrix element ρ00\rho_{00} of K∗(892)±K^*(892)^{\pm} mesons produced inclusively in neutron-carbon interactions at \~60 GeV have been carried out in the EXCHARM experiment at the Serpukhov accelerator. The values of ρ00\rho_{00} obtained in the transversity frame are 0.424±0.011(stat)±0.018(sys)0.424\pm0.011(stat)\pm0.018(sys) for K∗(892)+K^*(892)^+ and 0.393±0.025(stat)±0.018(sys)0.393\pm0.025(stat)\pm0.018(sys) for K∗(892)−K^*(892)^-. Significant PTP_T dependence of ρ00\rho_{00} has been observed in K∗(892)+K^*(892)^+ production.Comment: 8 pages, LaTeX, 3 eps figure

    Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC

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