Radiative decay of vector quarkonium

Constraints on glueballs and light gluinos

Mesut Bahadír Çakír, Glennys R. Farrar

    Research output: Contribution to journalArticle

    Abstract

    Given a resonance of known mass, width, and JPC, we can determine its gluonic branching fraction bRgg from data on it s production in radiative vector quarkonium decay VR. For most resonances bRgg is found to be 10%, consistent with being qq states, but we find that both pseudoscalars observed in the 1440 MeV region have bRgg1/2-1, and b(f0++g)1/2. As data improve, bRgg should be a useful discriminator between qq and gluonic states and may permit quantitative determination of the extent to which a particular resonance is a mixture of glueball and qq. We also examine the regime of validity of PQCD for predicting the rate of Vg, the extra pseudoscalar bound state which would exist if there were light gluinos. From the CUSB limit on peaks in X, the mass range 3 GeVm(g)7 GeV can be excluded. An experiment must be significantly more sensitive to exclude an g lighter than this.

    Original languageEnglish (US)
    Pages (from-to)3268-3278
    Number of pages11
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Volume50
    Issue number5
    DOIs
    StatePublished - 1994

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    Radiative decay of vector quarkonium : Constraints on glueballs and light gluinos. / Çakír, Mesut Bahadír; Farrar, Glennys R.

    In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 50, No. 5, 1994, p. 3268-3278.

    Research output: Contribution to journalArticle

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    abstract = "Given a resonance of known mass, width, and JPC, we can determine its gluonic branching fraction bRgg from data on it s production in radiative vector quarkonium decay VR. For most resonances bRgg is found to be 10{\%}, consistent with being qq states, but we find that both pseudoscalars observed in the 1440 MeV region have bRgg1/2-1, and b(f0++g)1/2. As data improve, bRgg should be a useful discriminator between qq and gluonic states and may permit quantitative determination of the extent to which a particular resonance is a mixture of glueball and qq. We also examine the regime of validity of PQCD for predicting the rate of Vg, the extra pseudoscalar bound state which would exist if there were light gluinos. From the CUSB limit on peaks in X, the mass range 3 GeVm(g)7 GeV can be excluded. An experiment must be significantly more sensitive to exclude an g lighter than this.",
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