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Rate measurement of D(0)-->K+pi(-)pi(0) and constraints on D(0) -- D(0) mixing |
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| Authors: | Brandenburg G Ershov A Kim D Y Wilson R Bergfeld T Eisenstein B I Ernst J Gladding G E Gollin G D Hans R M Johnson E Karliner I Marsh M A Plager C Sedlack C Selen M Thaler J J Williams J Edwards K W Sadoff A J Ammar R Bean A Besson D Zhao X Anderson S Frolov V V Kubota Y Lee S J Poling R Smith A Stepaniak C J Urheim J Ahmed S Alam M S Athar S B Jian L Ling L Saleem M Timm S Wappler F Anastassov A Eckhart E Gan K K Gwon C Hart T Honscheid K Hufnagel D Kagan H Kass R Pedlar T K Thayer J B von Toerne E Zoeller M M Richichi S J Severini H Skubic P Undrus A Savinov V Chen S Hinson J W Lee J |
| Institution: | Harvard University, Cambridge, Massachusetts 02138, USA. |
| Abstract: | We present an observation and time-integrated rate measurement of the decay D(0)-->K(+)pi(-)pi(0) produced in 9 fb(-1) of e(+)e(-) collisions near the Upsilon(4S) resonance. The signal is inconsistent with an upward fluctuation of the background by 4.9 standard deviations. We measured the time-integrated rate of D(0)-->K(+)pi(-)pi(0) normalized to the rate of D(0)-->K(+)pi(-)pi(0) to be 0.0043(+0.0011)(-0.0010) (stat)+/-0.0007 (syst). This decay can be produced by doubly Cabibbo-suppressed decays or by the D(0) evolving into a D(0) through mixing, followed by a Cabibbo-favored decay to K(+)pi(-)pi(0). We also found the CP asymmetry A = (9(+25)(-22))% be consistent with zero. |
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