A Simple Explanation for the X(3872) Mass Shift Observed for Decay to D^{*0} \bar{D^0}
We propose a simple explanation for the increase of approximately 3 MeV/c2 in the mass value of the X(3872) obtained from D{sup *0} {bar D}{sup 0} decay relative to that obtained from decay to J/{psi}{pi}{sup +}{pi}{sup -} If the total width of the X(3872) is 2-3 MeV, the peak position in the D{sup *0} {bar D}{sup 0} invariant mass distribution is sensitive to the final state orbital angular momentum because of the proximity of the X(3872) to D{sup *0} {bar D}{sup 0} threshold. We show that for total width 3 MeV and one unit of orbital angular momentum, a mass shift {approx}3 MeV/c2 is obtained; experimental mass resolution should slightly increase this value. A consequence is that spin-parity 2{sup -} is favored for the X(3872).
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 918968
- Report Number(s):
- SLAC-PUB-12934; PRLTAO; arXiv:0710.5191; TRN: US0806250
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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