Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Simple Explanation for the X(3872) Mass Shift Observed for Decay to
  D^{*0} {D^0}bar   We propose a simple explanation for the increase of approximately
  3 MeV/c^2 in the mass value of the X(3872) obtained from
  D^{*0} {D^0}bar decay relative to that obtained from decay to J/psi pi+ pi-.
  If the total width of the X(3872) is 2-3 MeV, the peak position in the
  D^{*0} {D^0}bar invariant mass distribution is sensitive to the final state
orbital angular momentum because of the proximity of the X(3872) to D^{*0}
{D^0}bar threshold. We show that for total width 3 MeV and one unit of orbital
angular momentum, a mass shift ~3 MeV/c^2 is obtained; experimental mass
resolution should slightly increase this value. A consequence is that
spin-parity 2^- is favored for the X(3872).

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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: q-bio
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: cond-mat
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: eess
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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The categories of this paper are: supr-con