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arXiv · hep-ex/0502027

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

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

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 $ψ^\prime \to J/ψππ$.

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M. Andreotti, S. Bagnasco, W. Baldini, D. Bettoni, G. Borreani, A. Buzzo, R. Calabrese, R. Cester, G. Cibinetto, P. Dalpiaz, G. Garzoglio, K. E. Gollwitzer, M. Graham, M. Hu, D. Joffe, J. Kasper, G. Lasio, M. Lo Vetere, E. Luppi, M. Macri, M. Mandelkern, F. Marchetto, M. Marinelli, E. Menichetti, Z. Metreveli, R. Mussa, M. Negrini, M. M. Obertino, M. Pallavicini, N. Pastrone, C. Patrignani, T. K. Pedlar, S. Pordes, E. Robutti, W. Roethel, J. L. Rosen, P. Rumerio, R. Rusack, A. Santroni, J. Schultz, S. H. Seo, K. K. Seth, G. Stancari, M. Stancari, A. Tomaradze, I. Uman, T. Vidnovic III, S. Werkema, P. Zweber. 2005-02-15. Measurement of the branching ratios $ψ^\prime \to e^+ e^-$, $ψ^\prime \to J/ψππ$ and $ψ^\prime \to J/ψη$. https://doi.org/10.1103/physrevd.71.032006

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