Search for the C-parity violating process J/psi->gamma gamma via psi(2S)->pi+pi- J/psi
Abstract
Using 14.0× 106 (2S) events collected with the BES-II detector, the C-parity violating process J/psi->gamma gamma via psi(2S)->pi+pi- J/psi is studied. We determine a new upper limit for the J/psi->gamma gamma branching ratio of B(J/psi->gamma gamma)<2.2× 10-5 at the 90% C.L., which is about 20 times lower than the previous measurement.
0
Turn this paper into a lesson
ArcXiv compiles a structured reading guide from this paper's metadata: plain-English importance, contributions, prerequisite concepts, which sections to read first, flashcards, and a quiz. Grounded in the abstract, never invented.