Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of the Radiative Decay $D^{*+}\to D^{+}\gamma$   We have observed a signal for the decay D*+ -> D+ gamma at a significance of
4 standard deviations. From the measured branching ratio B(D*+ -> D+
gamma)/B(D*+ -> D+ pi0)=0.055 +- 0.014 +- 0.010 we find B(D*+ -> D+ gamma)=
0.017 +- 0.004 +- 0.003, where the first uncertainty is statistical and the
second is systematic. We also report the highest precision measurements of the
remaining D*+ branching fractions.

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The categories of this paper are: comp-gas
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The categories of this paper are: math-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: stat
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: cond-mat
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The categories of this paper are: econ
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The categories of this paper are: hep-th
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The categories of this paper are: acc-phys
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The categories of this paper are: supr-con
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The categories of this paper are: hep-lat
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The categories of this paper are: solv-int
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The categories of this paper are: physics
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The categories of this paper are: ao-sci