We report a search for d* dibaryon production by double-radiative capture on pionic deuterium. The experiment was conducted at the TRIUMF cyclotron using the RMC cylindrical pair spectrometer, and detected γ-ray coincidences following pion stops in liquid deuterium. We found no evidence for narrow dibaryons, and obtained a branching ratio upper limit, BR < 6.7 × 10-6 (90% C.L.), for narrow d* production in the mass range from 1920 to 1980 MeV.
|Number of pages||6|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - Dec 5 2002|
Bibliographical noteFunding Information:
We wish to thank the staff of the TRIUMF laboratory for their support of this work. In particular we acknowledge the help of Dr. Renée Poutissou on the data acquisition and Dr. Dennis Healey on the cryogenic targets. In addition we thank Prof. Sergo B. Gerasimov for helpful and stimulating discussions, Prof. David S. Armstrong for carefully reading the manuscript and the National Science Foundation (United States) and the Natural Sciences and Engineering Research Council (Canada) for financial support.
- Double-radiative capture
- Pionic deuterium
ASJC Scopus subject areas
- Nuclear and High Energy Physics