Improved Measurement of Branching Fractions for pipi Transitions among Upsilon(nS)States

Details Improved Measurement of Branching Fractions for pipi Transitions among Upsilon(nS)States Improved Measurement of Branching Fractions for pipi Transitions among Upsilon(nS)States

2008-09-06

arxiv.org/abs/0809.1110v2

Phys.Rev.D79:011103,2009

Physics

High Energy Physics

High Energy Physics - Experiment

11 pages, available at http://www.lns.cornell.edu/public/CLNS/, Accepted for Publication in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.79.011103

Using samples of (5.93 +/- 0.10) x 10^6 Upsilon(3S) decays and (9.11 +/- 0.14) x 10^6 Upsilon(2S) decays collected with the CLEO detector, we report improved measurements of the branching fractions for the following five transitions: B(Upsilon(3S)-->Upsilon(1S) pi^+ pi^-) = (4.46 +/- 0.01 +/- 0.13)%, B(Upsilon(2S)-->Upsilon(1S) pi^+ pi^-) = (18.02 +/- 0.02 +/- 0.61)%, B(Upsilon(3S)-->Upsilon(1S) pi^0 pi^0) = (2.24 +/- 0.09 +/- 0.11)%, B(Upsilon(2S)-->Upsilon(1S) pi^0 pi^0) = (8.43 +/- 0.16 +/- 0.42)% and B(Upsilon(3S)-->Upsilon(2S) pi^0 pi^0) = (1.82 +/- 0.09 +/- 0.12)%. In each case the first uncertainty reported is statistical, while the second is systematic.

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