Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2007-06-15
Phys.Rev.D76:072001,2007
Physics
High Energy Physics
High Energy Physics - Experiment
24 pages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2007/, Accepted by PRD, one new table, one
Scientific paper
10.1103/PhysRevD.76.072001
We present measurements of decay matrix elements for hadronic transitions of the form Upsilon(nS) -> pi pi Upsilon(mS) where (n, m) = (3, 1), (2, 1), and (3, 2). We reconstruct charged and neutral pion modes with the final state Upsilon decaying to either mu+mu- or e+e-. Dalitz plot distributions for the twelve decay modes are fit individually as well as jointly assuming isospin symmetry, thereby measuring the matrix elements of the decay amplitude. We observe and account for the anomaly previously noted in the di-pion invariant mass distribution for the Upsilon(3S) -> pi pi Upsilon(1S) transition and obtain good descriptions of the dynamics of the decay using the most general decay amplitude allowed by partial conservation of the axial-vector current (PCAC) considerations. The fits further indicate that the Upsilon(2S) -> pi pi Upsilon(1S) and Upsilon(3S) -> pi pi Upsilon(2S) transitions also show the presence of terms in the decay amplitude that were previously ignored, although at a relatively suppressed level.
CLEO Collaboration
Cronin-Hennessy D.
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