Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Estimate for the X(3872) to gamma J/psi decay width   The X(3872) resonance is considered as a hadronic molecule, a loosely-bound
state of charmed D0 and D*0 mesons, since its mass is very close to the D*0
barD0 threshold. Assuming structure and quantum numbers of X(3872) as (D0
barD*0 - D*0 barD0)/sqrt(2) and J(PC) = 1(++), we calculate the X(3872) to
gamma J/psi decay using a phenomenological Lagrangian approach. We also
estimate the contribution of an additional c bar(c) component in the X(3872) to
this decay width, which is shown to be suppressed relative to the one of the
molecular configuration.

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The categories of this paper are: adap-org
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The categories of this paper are: eess
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The categories of this paper are: hep-lat
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The categories of this paper are: chem-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: quant-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: math
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The categories of this paper are: physics
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The categories of this paper are: plasm-ph