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. 2007 Nov 9;99(19):191801.
doi: 10.1103/PhysRevLett.99.191801. Epub 2007 Nov 5.

Evidence for the decay D0-->K(-)pi(+)pi(-)e(+)nu(e)

M Artuso  1 , S Blusk, J Butt, J Li, N Menaa, R Mountain, S Nisar, K Randrianarivony, R Sia, T Skwarnicki, S Stone, J C Wang, K Zhang, G Bonvicini, D Cinabro, M Dubrovin, A Lincoln, D M Asner, K W Edwards, P Naik, R A Briere, T Ferguson, G Tatishvili, H Vogel, M E Watkins, J L Rosner, N E Adam, J P Alexander, D G Cassel, J E Duboscq, R Ehrlich, L Fields, R S Galik, L Gibbons, R Gray, S W Gray, D L Hartill, B K Heltsley, D Hertz, C D Jones, J Kandaswamy, D L Kreinick, V E Kuznetsov, H Mahlke-Krüger, D Mohapatra, P U E Onyisi, J R Patterson, D Peterson, J Pivarski, D Riley, A Ryd, A J Sadoff, H Schwarthoff, X Shi, S Stroiney, W M Sun, T Wilksen, S B Athar, R Patel, V Potlia, J Yelton, P Rubin, C Cawlfield, B I Eisenstein, I Karliner, D Kim, N Lowrey, M Selen, E J White, J Wiss, R E Mitchell, M R Shepherd, D Besson, T K Pedlar, D Cronin-Hennessy, K Y Gao, J Hietala, Y Kubota, T Klein, B W Lang, R Poling, A W Scott, A Smith, P Zweber, S Dobbs, Z Metreveli, K K Seth, A Tomaradze, J Ernst, K M Ecklund, H Severini, W Love, V Savinov, O Aquines, A Lopez, S Mehrabyan, H Mendez, J Ramirez, G S Huang, D H Miller, V Pavlunin, B Sanghi, I P J Shipsey, B Xin, G S Adams, M Anderson, J P Cummings, I Danko, D Hu, B Moziak, J Napolitano, Q He, J Insler, H Muramatsu, C S Park, E H Thorndike, F Yang; CLEO Collaboration
Affiliations

Evidence for the decay D0-->K(-)pi(+)pi(-)e(+)nu(e)

M Artuso et al. Phys Rev Lett. .

Abstract

Using a 281 pb{-1} data sample collected at the psi(3770) with the CLEO-c detector, we present the first absolute branching fraction measurement of the decay D0-->K(-)pi(+)pi(-)e(+)nu(e) at a statistical significance of about 4.0 standard deviations. We find 10 candidates consistent with the decay D0-->K(-)pi(+)pi(-)e(+)nu(e). The probability that a background fluctuation accounts for this signal is less than 4.1 x 10{-5}. We find B(D0-->K(-)pi(+)pi(-)e(+)nu(e)) = [2.8{-1.1}{+1.4}(stat)+/-0.3(syst)]x10{-4}. By restricting the invariant mass of the hadronic system to be consistent with K1(1270), we obtain the product of branching fractions B(D{0}-->K{1}{-}(1270)e{+}nu{e})xB(K1-(1270)-->K{-}pi{+}pi{-})=[2.5{-1.0}{+1.3}(stat)+/-0.2(syst)]x10{-4}. Using B(K1-(1270)-->K{-}pi{+}pi{-})=(33+/-3)%, we obtain B(D{0}-->K{1}{-}(1270)e{+}nu{e})=[7.6{-3.0}{+4.1}(stat)+/-0.6(syst)+/-0.7]x10{-4}. The last error accounts for the uncertainties in the measured K1-(1270)-->K{-}pi{+}pi{-} branching fractions.

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