A possible hadronic excess in psi(2S) decay and the rho pi puzzle
We study the so-called {rho}{pi} puzzle of the {psi}(2S) decay by incorporating two inputs; the relative phase between the one-photon and the gluonic decay amplitude, and a possible hadronic excess in the inclusive nonelectromagnetic decay rate of {psi}(2S). We look into the possibility that the hadronic excess in {psi}(2S) originates from a decay process of long-distance origin which is absent from the J/{upsilon} decay. We propose that the amplitude of this additional process happens to nearly cancel the short-distance gluonic amplitude in the exclusive decay {psi}(2S) {yields} 1{sup -}0{sup -} and turn the sum dominantly real in contrast to the J/{psi} decay. We present general consequences of this mechanism and survey two models which might possibly explain the source of this additional amplitude.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director. Office of Science. Office of High Energy and Nuclear Physics. Division of High Energy Physics; U.S. National Science Foundation Grant PHY-95-14797 (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 834417
- Report Number(s):
- LBNL-46203; R&D Project: PTHOPS; TRN: US0407117
- Journal Information:
- Physical Review D, Vol. 6305, Issue 5; Other Information: Submitted to Physical Review D, Volume 6305, No.5; Journal Publication Date: 03/01/2001; PBD: 9 Nov 2000
- Country of Publication:
- United States
- Language:
- English
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