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首页> 外文期刊>Bulletin of the American Physical Society >APS -APS April Meeting 2017 - Event - Status of the KOTO experiment at J-PARC
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APS -APS April Meeting 2017 - Event - Status of the KOTO experiment at J-PARC

机译：APS -APS四月会议2017-活动-J-PARC的KOTO实验状态

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The K0TO experiment conducted at J-PARC was designed to observe the K$^{0}_{L} ightarrow pi^{0}uar{u}$ decay and measure its branching ratio. The current SM prediction for the branching ratio is 3.0 x 10$^{-11}$ with a small theoretical uncertainty of about 2-3%. Studying this rare decay is an ideal candidate to search for physics beyond the standard model. The previous search performed by the KEK E391a collaboration set a limit on the branching ratio of 2.6 x 10$^{-8}$.As a result of the favorable outcome of KEK E391, the K0TO experiment is intended to pursue the search with increased beam power, an upgraded data acquisition system, and improved detector hardware. The signature of the decay is a pair of photons from the $pi^{0}$ decay and no other detected particles. For the measurement of the energies and positions of the photons, K0TO uses a Cesium Iodide (CSI) electromagnetic calorimeter as the main detector, and hermetic veto counters to guarantee that there are no other detected particles.The initial data was collected in 2013, followed by additional runs in 2015-2016 at beam powers of 24 and 40 kW, respectively. In this talk, we present a description of the upgrades and improvements to the detector, present status, and the latest results.
机译：在J-PARC进行的K0TO实验旨在观察K $ ^ {0} _ {L} ightarrow pi ^ {0} uar {u} $的衰减并测量其分支比。当前对支化比的SM预测为3.0 x 10 $ ^ {-11} $，理论上的较小不确定性约为2-3％。研究这种罕见的衰变是寻找超出标准模型的物理学的理想人选。由KEK E391a合作进行的先前搜索将分支比例设置为2.6 x 10 $ ^ {-8} $的上限。由于KEK E391的结果令人满意，K0TO实验的目的是提高搜索范围光束功率，升级的数据采集系统和改进的探测器硬件。衰变的特征是来自π^ {0} $衰变的一对光子，没有其他检测到的粒子。为了测量光子的能量和位置，K0TO使用碘化铯（CSI）电磁热量计作为主要检测器，并使用密封否决计数器来确保没有其他被检测到的粒子.2013年收集了初始数据，随后在2015-2016年分别增加束功率为24和40 kW的运行。在本次演讲中，我们将介绍检测器的升级和改进，当前状态以及最新结果。

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