利用BESⅢ的双层TOF寻找D0-——D0混合的研究
이용BESⅢ적쌍층TOF심조D0-——D0혼합적연구
Search for D0-——D0 Mixing with Double-Layer TOF at BESⅢ
  • 万方数据
    高能物理与核物理 고능물리여핵물리
    HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS
    2007年 5期 423-430 ,共8页

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    손영소%하강림%리위동%변점명%조국부%산자염%하묘%황빈%계효빈%리강%리해파%류춘수%류부민%마추매%마상%모아군%모택보%막효호%구진발%손성삼%왕기과%왕량량%문석빈%오령혜%사우엄%양명%우정윤%유국위%원장정%원야%장석뢰%장장춘%장건용%장령%장학요%장요%정지붕%주영생%추가항

    D0---D0混合%D0→K-π+衰变%粒子鉴别%飞行时间计数器%事例起始时间 D0---D0混閤%D0→K-π+衰變%粒子鑒彆%飛行時間計數器%事例起始時間
    D0---D0혼합%D0→K-π+쇠변%입자감별%비행시간계수기%사례기시시간
    D0---D0 mixing%D0→ K-π+%particle identification%TOF%event start time
    在ψ(3770)处,D0→K-π+是研究D0---D0混合的非常理想的衰变道.实验上,良好的K/π识别技术将对寻找D0---D0混合过程起着决定性的作用.在BESⅢ实验的物理预研究中,发现利用飞行时间的信息,能够精确测定末态中含有多条带电径迹事例的起始时间,从而可以改善飞行时间计数器的时间分辨率.进一步的研究表明,应用该方法后,BESⅢ双层TOF的时间分辨率从～78ps降到～64ps.按照20fb-1的ψ(3770)数据量进行估算,在95%置信度下,D0---D0混合率的上限值可以提高7%左右.
    재ψ(3770)처,D0→K-π+시연구D0---D0혼합적비상이상적쇠변도.실험상,량호적K/π식별기술장대심조D0---D0혼합과정기착결정성적작용.재BESⅢ실험적물리예연구중,발현이용비행시간적신식,능구정학측정말태중함유다조대전경적사례적기시시간,종이가이개선비행시간계수기적시간분변솔.진일보적연구표명,응용해방법후,BESⅢ쌍층TOF적시간분변솔종～78ps강도～64ps.안조20fb-1적ψ(3770)수거량진행고산,재95%치신도하,D0---D0혼합솔적상한치가이제고7%좌우.
    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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