Tajima O, Abe K, Abe K, Aihara H, Akatsu M, Aulchenko V, Aushev T, Bakich A M, Bay A, Bizjak I, Bondar A, Bozek A, Bracko M, Browder T E, Chao Y, Cheon B G, Chistov R, Choi Y, Choi Y K, Chuvikov A, Danilov M, Dong L Y, Eidelman S, Eiges V, Fang F, Gabyshev N, Garmash A, Gershon T, Gokhroo G, Haba J, Hagner C, Handa F, Hasuko K, Hazumi M, Higuchi I, Hokuue T, Hoshi Y, Hou W-S, Huang H-C, Iijima T, Inami K, Ishikawa A, Itoh R, Iwasaki Y, Kang J H, Kang J S, Kapusta P, Katayama N, Kawai H, Kichimi H, Kim H J, Kim Hyunwoo, Kim J H, Kim S K, Kinoshita K, Koppenburg P, Korpar S, Krizan P, Krokovny P, Kuzmin A, Kwon Y-J, Lange J S, Leder G, Lee S H, Lesiak T, Li J, Limosani A, Lin S-W, MacNaughton J, Majumder G, Mandl F, Matsumoto H, Matsumoto T, Matyja A, Mikami Y, Mitaroff W, Miyabayashi K, Miyata H, Mohapatra D, Moloney G R, Nagamine T, Nagasaka Y, Nakano E, Nakazawa H, Natkaniec Z, Nishida S, Nitoh O, Nozaki T, Ogawa S, Ohshima T, Okuno S, Olsen S L, Ozaki H, Park C W, Park K S, Parslow N, Piilonen L E, Sagawa H, Saigo M, Sakai Y, Schneider O, Schümann J, Schwartz A J, Semenov S, Senyo K, Shibuya H, Shwartz B, Sidorov V, Singh J B, Soni N, Stanic S, Staric M, Sumisawa K, Sumiyoshi T, Suzuki S, Suzuki S Y, Takasaki F, Tamai K, Tamura N, Teramoto Y, Tomura T, Trabelsi K, Tsuboyama T, Tsukamoto T, Uehara S, Ueno K, Uno S, Varner G, Wang C C, Wang J G, Watanabe Y, Yabsley B D, Yamada Y, Yamaguchi A, Yamamoto H, Yamashita Y, Yamauchi M, Yusa Y, Zhang Z P, Zhilich V, Zontar D
Tohoku University, Sendai.
Phys Rev Lett. 2004 Mar 12;92(10):101803. doi: 10.1103/PhysRevLett.92.101803. Epub 2004 Mar 11.
We report the observation of the decay D0-->phigamma with a statistical significance of 5.4sigma in 78.1 fb(-1) of data collected by the Belle experiment at the KEKB e+e- collider. This is the first observation of a flavor-changing radiative decay of a charmed meson. The Cabibbo- and color-suppressed decays D0-->phipi(0), phieta are also observed for the first time. We measure branching fractions B(D0-->phigamma)=[2.60(+0.70)(-0.61)(stat)+0.15-0.17(syst)] x 10(-5), B(D0-->phipi(0))=[8.01+/-0.26(stat)+/-0.47(syst)] x 10(-4), and B(D0-->phieta)=[1.48+/-0.47(stat)+/-0.09(syst)] x 10(-4).
我们报告了在KEKB正负电子对撞机上的 Belle 实验收集的 78.1 fb⁻¹数据中，观测到 D⁰→φγ衰变，统计显著性为 5.4σ。这是首次观测到 charm 介子的味改变辐射衰变。Cabibbo 压低和颜色压低的衰变 D⁰→φπ⁰、φη也首次被观测到。我们测量分支比B(D⁰→φγ)=[2.60(+0.70)(-0.61)(统计)+0.15 - 0.17(系统)]×10⁻⁵，B(D⁰→φπ⁰)=[8.01±0.26(统计)±0.47(系统)]×10⁻⁴，以及 B(D⁰→φη)=[1.48±0.47(统计)±0.09(系统)]×10⁻⁴。
