Search for D<SUP>0</SUP>-D<SUP>0</SUP> Mixing with Double-Layer TOF at BESⅢ

SUN Yong-Zhao; HE Kang-Lin; LI Wei-Dong; BIAN Jian-Ming; CAO Guo-Fu; DENG Zi-Yan; HE Miao; HUANG Bin; JI Xiao-Bin; LI Gang; LI Hai-Bo; LIU Chun-Xiu; LIU Hua

Chinese Physics C> 2007, Vol. 31> Issue(5) : 423-430

Search for D⁰-D⁰ Mixing with Double-Layer TOF at BESⅢ

Institute of High Energy Physics, CAS, Beijing 100049, China2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China3 CCASTWorld Laboratory, Beijing 100080, China4 Peking University, Beijing 100871, China5 Hunan University, Changsha 410082, China6 Shandong University, Ji'nan 250100, China

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The decay of D⁰→K^－π⁺ is a golden channel in the study of D⁰-D⁰ mixing at ψ(3770). The requirements of excellent K/π separation will play an essential role in the mixing search. A technique was developed to precisely extract event start time (t₀) with TOF measurements in multiple charged tracks event at BESⅢ. After the t₀ extracting algorithm, the time resolution of double-layer TOF reduced from ～78ps to ～64ps, the upper limit of D⁰-D⁰ mixing rate at 95% CL can be improved by a factor of 7% in 20fb^－1 ψ(3770) data.

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SUN Yong-Zhao, HE Kang-Lin, LI Wei-Dong, BIAN Jian-Ming, CAO Guo-Fu, DENG Zi-Yan, HE Miao, HUANG Bin, JI Xiao-Bin, LI Gang, LI Hai-Bo, LIU Chun-Xiu, LIU Hua, Search for D⁰-D⁰ Mixing with Double-Layer TOF at BESⅢ[J]. Chinese Physics C, 2007, 31(5): 423-430.

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Received: 2006-08-29
Revised: 2006-10-30

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Search for D⁰-D⁰ Mixing with Double-Layer TOF at BESⅢ

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