D⁰→ρ⁰γ的观测及在辐射粲夸克衰变中寻找CP破坏
Observation of D^{0}→ρ^{0}γ and Search for CP Violation in Radiative Charm Decays.
作者信息
Nanut T, Zupanc A, Adachi I, Aihara H, Al Said S, Asner D M, Aulchenko V, Aushev T, Ayad R, Babu V, Badhrees I, Bakich A M, Bansal V, Behera P, Bhardwaj V, Biswal J, Bondar A, Bozek A, Bračko M, Browder T E, Červenkov D, Chekelian V, Chen A, Cheon B G, Chistov R, Cho K, Choi S-K, Choi Y, Cinabro D, Dash N, Di Carlo S, Doležal Z, Dutta D, Eidelman S, Farhat H, Fast J E, Ferber T, Fulsom B G, Gaur V, Gabyshev N, Garmash A, Gillard R, Goldenzweig P, Golob B, Hayasaka K, Hayashii H, Hou W-S, Iijima T, Inami K, Inguglia G, Ishikawa A, Iwasaki Y, Jacobs W W, Jaegle I, Joffe D, Joo K K, Julius T, Kaliyar A B, Kang K H, Kawasaki T, Kim D Y, Kim J B, Kim K T, Kim M J, Kim S H, Kinoshita K, Kodyš P, Korpar S, Krokovny P, Kuhr T, Kulasiri R, Kuzmin A, Kwon Y-J, Lange J S, Lee I S, Li C H, Li L, Li Y, Li Gioi L, Libby J, Liventsev D, Lubej M, Masuda M, Matsuda T, Matvienko D, Miyabayashi K, Miyata H, Mizuk R, Mohanty G B, Moon H K, Nakao M, Nath K J, Nayak M, Nisar N K, Nishida S, Ogawa S, Okuno S, Pakhlov P, Pakhlova G, Pal B, Park C-S, Park C W, Park H, Paul S, Pedlar T K, Pesántez L, Pestotnik R, Petrič M, Piilonen L E, Prasanth K, Pulvermacher C, Rauch J, Ritter M, Rostomyan A, Sakai Y, Sandilya S, Santelj L, Sanuki T, Sato Y, Savinov V, Schlüter T, Schneider O, Schnell G, Schwanda C, Schwartz A J, Seino Y, Senyo K, Seon O, Sevior M E, Shebalin V, Shen C P, Shibata T-A, Shiu J-G, Shwartz B, Solovieva E, Stanič S, Starič M, Strube J F, Stypula J, Sumiyoshi T, Takizawa M, Tamponi U, Tenchini F, Trabelsi K, Uchida M, Uno S, Ushiroda Y, Varner G, Vinokurova A, Vorobyev V, Vossen A, Wang C H, Wang M-Z, Wang P, Watanabe Y, Widmann E, Won E, Yamaoka J, Yamashita Y, Yelton J, Zhang Z P, Zhilich V, Zhukova V, Zhulanov V
机构信息
J. Stefan Institute, 1000 Ljubljana.
Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana.
出版信息
Phys Rev Lett. 2017 Feb 3;118(5):051801. doi: 10.1103/PhysRevLett.118.051801. Epub 2017 Jan 31.
We report the first observation of the radiative charm decay D^{0}→ρ^{0}γ and the first search for CP violation in decays D^{0}→ρ^{0}γ, ϕγ, and K[over ¯]^{*0}(892)γ, using a data sample of 943 fb^{-1} collected with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. The branching fraction is measured to be B(D^{0}→ρ^{0}γ)=(1.77±0.30±0.07)×10^{-5}, where the first uncertainty is statistical and the second is systematic. The obtained CP asymmetries A_{CP}(D^{0}→ρ^{0}γ)=+0.056±0.152±0.006, A_{CP}(D^{0}→ϕγ)=-0.094±0.066±0.001, and A_{CP}(D^{0}→K[over ¯]^{*0}γ)=-0.003±0.020±0.000 are consistent with no CP violation. We also present an improved measurement of the branching fractions B(D^{0}→ϕγ)=(2.76±0.19±0.10)×10^{-5} and B(D^{0}→K[over ¯]^{*0}γ)=(4.66±0.21±0.21)×10^{-4}.
我们报告了对辐射性粲夸克衰变(D^{0}→ρ^{0}γ)的首次观测，以及利用在KEKB非对称能量(e^{+}e^{-})对撞机上的Belle探测器收集的943 (fb^{-1})数据样本，对(D^{0}→ρ^{0}γ)、(ϕγ)和(\overline{K}^{*0}(892)γ)衰变中CP破坏的首次搜寻。测得分支比为(B(D^{0}→ρ^{0}γ)=(1.77±0.30±0.07)×10^{-5})，其中第一个不确定度是统计性的，第二个是系统性的。得到的CP不对称性(A_{CP}(D^{0}→ρ^{0}γ)=+0.056±0.152±0.006)、(A_{CP}(D^{0}→ϕγ)=-0.094±0.066±0.001)和(A_{CP}(D^{0}→\overline{K}^{*0}γ)=-0.003±0.020±0.000)与无CP破坏一致。我们还给出了对分支比(B(D^{0}→ϕγ)=(2.76±0.19±0.10)×10^{-5})和(B(D^{0}→\overline{K}^{*0}γ)=(4.66±0.21±0.21)×10^{-4})的改进测量结果。
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