• D Mishra

      Articles written in Pramana – Journal of Physics

    • Chiral SU(4) × SU(4) breaking: masses and decay constants of charmed hadrons

      T N Tiwari D Mishra

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      The (4, 4*) ⊕ (4*, 4) model of broken chiral SU (4) × SU (4) symmetry has been used to calculate the third-order coupling constants involving charmed and ordinary pseudoscalar mesons. These coupling constants are exploited to derive some interesting new relations among the masses and decay constants of these charmed particles. Using the known masses and decay constants as inputs, we exploit these relations to predict:FD = −1·41Fπ,FF = −1·13Fπ,FD/FF = 1·25,m(Ds) = 1·43 GeV,m(Fs) = 1·39 GeV andm(Ks) = 1·02 GeV.

    • Mixing of meson isosinglets

      D Mishra C V Sastry

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      The mixing angles for the vector and pseudoscalar meson isosinglets are obtained in a non-relativistic quark model. Schwinger-type mass relations are also obtained for SU(4) and SU(5). Quark contents of different meson isosinglets are computed which agree well with similar estimation of Maki and co-workers and Boal.

    • Mixing of meson isosinglets in SU(5) and an extension to SU(N)

      D Mishra C V Sastry

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      The mixing angles of meson isosinglets belonging to the 24-dimensional and singlet representations of SU(5) are calculated under specific assumptions in the non-relativistic quark model. The procedure to extend the scheme to SU(N) has been outlined. The results have been compared with other earlier estimates.

    • Mass relations for heavy mesons

      D Mishra C V Sastry

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      In a non-relativistic quark model, by parametrizing the quark-antiquark potentials, some mass relations have been obtained. Algebraic expressions for the masses of higher flavour meson isosinglets have been given in terms of the meson masses of lower symmetries. Hallock and Oneda’s contention of two types of sumrules for nonet mesons in SU(3) has been examined and the possibilities of such different sum-rules of this type in SU(4) and SU(5) have been explored.

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