A search for direct electron production in pp interactions at 2.0 GeV/c
TN Rangaswamy, A Gurtu, PK Malhotra, R Raghavan, A Subramanian, K Sudhakar, GJ Chapman, AG Klein, GC Mason, GI Opat, SN Tovey, JWG Wignall
Nuclear Physics, Section B | Published : 1979
A search for prompt electron production in pp annihilations from an exposure of 2 GeV/c p's in a bubble chamber with a track-sensitive target is presented. Subtracting the expected Dalitz decay of η and ω for pair masses me + e - > mπ0 we obtain 95% confidence level upper limits for the ratio R = Ne- Nπ- = Ne + e- Nπ0 as 7 × 10-5. © 1979.