Experimental Study of chi_b(2P) --> pi pi chi_b(1P)

Details Experimental Study of chi_b(2P) --> pi pi chi_b(1P) Experimental Study of chi_b(2P) --> pi pi chi_b(1P)

2005-11-07

arxiv.org/abs/hep-ex/0511019v2

Phys.Rev.D73:012003,2006

Physics

High Energy Physics

High Energy Physics - Experiment

14 pages postscript,also available through thishttp://www.lns.cornell.edu/public/CLNS/2005/, Submitted to PRD

Scientific paper

10.1103/PhysRevD.73.012003

We have searched for the di-pion transition chi_b(2P) -> pi pi chi_b(1P) in the CLEO III sample of Upsilon(3S) decays in the exclusive decay chain: Upsilon(3S) -> gamma chi_b(2P), chi_b(2P) -> pi pi chi_b(1P), chi_b(1P) -> gamma Upsilon(1S), Upsilon(1S) -> lepton pairs. Our studies include both pi+ pi- and pi0 pi0, each analyzed both in fully reconstructed events and in events with one pion undetected. We show that the null hypothesis is not substantiated. Under reasonable assumptions, we find the partial decay width to be Gamma[chi_b(2P) -> pi pi chi_b(1P)] = (0.83 +/- 0.22 +/- 0.08 +/- 0.19) keV, with the uncertainties being statistical, internal CLEO systematics, and common systematics from outside sources.

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