A tagged low-momentum kaon test-beam exposure with a 250L LAr TPC (J-PARC T32)
A tagged low-momentum kaon test-beam exposure with a 250L LAr TPC (J-PARC T32)
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DOI：
10.1088/1742-6596/308/1/012008
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发表时间：
2011-05
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通讯作者：
O. Araoka;A.Badertscher;A.Curioni;S.DiLuise;U.Degunda;L.Epprecht;L.Esposito;A.Gendotti;T.Hasegawa;S.Horikawa;K.Kasami;N.Kimura;L.Knecht;T.Kobayashi;C.Lazzaro;D.Lussi;M.Maki;A.Marchionni;T.Maruyama;A.Meregaglia;T.Mitani;Y.Nagasaka;J.Naganoma;H.Naito;S.Narita;G.Natterer;K.Nishikawa;A.Okamoto;H.Okamoto;F.Petrolo;F.Resnati;A.Rubbia;C.Strabel;M.Tanaka;T.Viant;Y.Yamanoi;K.Yorita;M.Yoshioka
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文献类型：
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作者：
O. Araoka;A.Badertscher;A.Curioni;S.DiLuise;U.Degunda;L.Epprecht;L.Esposito;A.Gendotti;T.Hasegawa;S.Horikawa;K.Kasami;N.Kimura;L.Knecht;T.Kobayashi;C.Lazzaro;D.Lussi;M.Maki;A.Marchionni;T.Maruyama;A.Meregaglia;T.Mitani;Y.Nagasaka;J.Naganoma;H.Naito;S.Narita;G.Natterer;K.Nishikawa;A.Okamoto;H.Okamoto;F.Petrolo;F.Resnati;A.Rubbia;C.Strabel;M.Tanaka;T.Viant;Y.Yamanoi;K.Yorita;M.Yoshioka
2010年初，我们在J-PARC PAC上提出了一个针对大型(100千吨级)液态Ar TPC的R$&D计划，适合与J-PARC中微子束一起研究中微子部分CP破坏的可能性，并探索核子衰变。作为第一步，我们提出了一项测试实验，以识别和测量带电K介子，包括它们在液态Ar中的衰变。该探测器是一台250L的Lar TPC，暴露在J-PARC慢引出设施的K1.1BR光束线中的带电K介子，动量范围为540-800 MeV/c。这对于估计带电K介子模式($p\right tarrow\bar{\nu}K^+$等)中核子衰变搜索的效率和背景尤其重要，在该模式下，K介子动量预计在几百MeV/c范围内。K1.1BR光束线的原型装置已于2010年秋季曝光。本文介绍了光束线的性能，探测器样机的结构和建立，以及一些初步的结果。
At the beginning of 2010, we presented at the J-PARC PAC an R$&$D program towards large (100 kton scale) liquid argon TPCs, suitable to investigate, in conjunction with the J-PARC neutrino beam, the possibility of CP violation in the neutrino sector and to search for nucleon decay. As a first step we proposed a test experiment to identify and measure charged kaons, including their decays, in liquid argon. The detector, a 250L LAr TPC, is exposed to charged kaons, in a momentum range of 540-800 MeV/c, in the K1.1BR beamline of the J-PARC slow extraction facility. This is especially important to estimate efficiency and background for nucleon decay searches in the charged kaon mode ($p \rightarrow \bar{\nu} K^+$, etc.), where the kaon momentum is expected to be in the few hundred MeV/c range. A prototype setup has been exposed in the K1.1BR beamline in the fall of 2010. This paper describes the capabilities of the beamline, the construction and setting up of the detector prototype, along with some preliminary results.