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Observation of the Dalitz decay Ds*+→Ds+e+ e-

Physical Review D - Particles, Fields, Gravitation and Cosmology 86:7 (2012)

Authors:

D Cronin-Hennessy, J Hietala, S Dobbs, Z Metreveli, KK Seth, A Tomaradze, T Xiao, L Martin, A Powell, G Wilkinson, DM Asner, G Tatishvili, H Mendez, JY Ge, DH Miller, IPJ Shipsey, B Xin, GS Adams, D Hu, B Moziak, J Napolitano, KM Ecklund, J Insler, H Muramatsu, CS Park, LJ Pearson, EH Thorndike, S Ricciardi, C Thomas, M Artuso, S Blusk, R Mountain, T Skwarnicki, S Stone, JC Wang, LM Zhang, G Bonvicini, D Cinabro, A Lincoln, MJ Smith, P Zhou, J Zhu, P Naik, J Rademacker, KW Edwards, K Randrianarivony, RA Briere, H Vogel, PUE Onyisi, JL Rosner, JP Alexander, DG Cassel, S Das, R Ehrlich, L Gibbons, SW Gray, DL Hartill, BK Heltsley, DL Kreinick, VE Kuznetsov, JR Patterson, D Peterson, D Riley, A Ryd, AJ Sadoff, X Shi, WM Sun, J Yelton, P Rubin, N Lowrey, S Mehrabyan, M Selen, J Wiss, J Libby, M Kornicer, RE Mitchell, MR Shepherd, CM Tarbert, D Besson, TK Pedlar

Abstract:

Using 586pb -1 of e +e - collision data acquired at √s=4.170GeV with the CLEO-c detector at the Cornell Electron Storage Ring, we report the first observation of Ds*+→Ds+e +e - with a significance of 5.3σ. The ratio of branching fractions B(Ds*+→Ds+e +e -)/ B(Ds*+→Ds+γ) is measured to be [0.72-0.13+0.15(stat)±0. 10(syst)]%, which is consistent with theoretical expectations. © 2012 American Physical Society.
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