Study of radiative bottomonium transitions using converted photons
The BABAR Collaboration, J. P. Lees, V. Poireau, E. Prencipe, V., Tisserand, J. GarraTico, E. Grauges, M. Martinelli, D. A. Milanes, A. Palano,, M. Pappagallo, G. Eigen, B. Stugu, L. Sun, D. N. Brown, L. T. Kerth, Yu. G., Kolomensky, G. Lynch, H. Koch, T. Schroeder
TL;DR
This study analyzes radiative bottomonium transitions using converted photons in a large dataset, providing precise measurements of decay branching fractions and observing specific decay modes with implications for bottomonium spectroscopy.
Contribution
It introduces a novel method of using converted photons to study bottomonium radiative transitions and reports new measurements and observations in this domain.
Findings
Observation of Upsilon(3S) -> gamma chi_b0,2(1P) decay
Precise measurements of branching fractions for chi_b1,2(1P,2P) decays
Search for radiative decays to eta_b states
Abstract
We use 111+/-1 million Upsilon(3S) and 89+/-1 million Upsilon(2S) events recorded by the BaBar detector at the PEP-II B-factory at SLAC to perform a study of radiative transitions between bottomonium states using photons that have been converted to e+e- pairs by the detector material. We observe Upsilon(3S) -> gamma chi_b0,2(1P) decay, make precise measurements of the branching fractions for chi_b1,2(1P,2P) -> gamma Upsilon(1S) and chi_b1,2(2P) -> gamma Upsilon(2S) decays, and search for radiative decay to the eta_b(1S) and eta_b(2S) states.
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