Resonances decaying to a photon and aJ(ψ)particle

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1 November 1975

journal article
research article
Published by American Physical Society (APS) in Physical Review D

Vol. 12 (9) , 2761-2764
https://doi.org/10.1103/physrevd.12.2761

Abstract

If

L = 1

orbital excitations

{}^{3}P_{2, 1, 0}

of the

J (ψ)

particle exist (assuming it to be a

{}^{3}S_{1}

quark-antiquark state), the decays

{}^{3}P_{2, 1} \to J (ψ) + γ

,

J (ψ) \to {(lepton)}^{+} + {(lepton)}^{-}

are predicted to yield

W ({}^{3}P_{2}, θ) α 1 + (0.4 to 6) {cos}^{2} θ

and

W ({}^{3}P_{1}, θ) α {sin}^{2} θ

. Here

W (θ)

is the distribution in angle

θ

between the photon and either lepton in the

J (ψ)

rest frame. The decay

{}^{3}P_{0} \to J (ψ) + γ

[which must have

W ({}^{3}P_{0}, θ) \sim 1 + {cos}^{2} θ

] is predicted to be suppressed.

Keywords

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