Measurement of the branching ratios $ψ^\prime \to e^+ e^-$, $ψ^\prime \to J/ψππ$ and $ψ^\prime \to J/ψη$

Andreotti, M.; Bagnasco, S.; Baldini, W.; Bettoni, D.; Borreani, G.; Buzzo, A.; Calabrese, R.; Cester, R.; Cibinetto, G.; Dalpiaz, P.; Garzoglio, G.; Gollwitzer, K. E.; Graham, M.; Hu, M.; Joffe, D.; Kasper, J.; Lasio, G.; Vetere, M. Lo; Luppi, E.; Macri, M.; Mandelkern, M.; Marchetto, F.; Marinelli, M.; Menichetti, E.; Metreveli, Z.; Mussa, R.; Negrini, M.; Obertino, M. M.; Pallavicini, M.; Pastrone, N.; Patrignani, C.; Pedlar, T. K.; Pordes, S.; Robutti, E.; Roethel, W.; Rosen, J. L.; Rumerio, P.; Rusack, R.; Santroni, A.; Schultz, J.; Seo, S. H.; Seth, K. K.; Stancari, G.; Stancari, M.; Tomaradze, A.; Uman, I.; Vidnovic III, T.; Werkema, S.; Zweber, P.

Measurement of the branching ratios $ψ^\prime \to e^+ e^-$, $ψ^\prime \to J/ψππ$ and $ψ^\prime \to J/ψη$

Authors

Description

We have measured several branching ratios for $ψ^\prime$ decay using the data collected by FNAL E835 experiment during year 2000, obtaining ${\cal B}(ψ^\prime \to e^+ e^-) = 0.0068\pm0.0001\pm0.0004$, ${\cal B}(ψ^\prime \to J/ψπ^+ π^-) = 0.292\pm0.005\pm0.018$, ${\cal B}(ψ^\prime \to J/ψπ^0 π^0) = 0.167\pm0.005\pm0.014$ and ${\cal B}(ψ^\prime \to J/ψη) = 0.028\pm0.002\pm0.002$. We also present a measurement of the dipion mass distribution in the decays $ψ^\prime \to J/ψππ$.