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arXiv 1208.2629hep-ex
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用ICARUS探测器精确测量CNGS束流中的中微子速度

Precision measurement of the neutrino velocity with the ICARUS detector in the CNGS beam

M. Antonello, B. Baibussinov, F. Boffelli, P. Benetti, E. Calligarich, N. Canci, S. Centro, A. Cesana, K. Cieslik, D. B. Cline, A. G. Cocco, A. Dabrowska, D. De… 展开作者

M. Antonello, B. Baibussinov, F. Boffelli, P. Benetti, E. Calligarich, N. Canci, S. Centro, A. Cesana, K. Cieslik, D. B. Cline, A. G. Cocco, A. Dabrowska, D. Dequal, A. Dermenev, R. Dolfini, C. Farnese, A. Fava, A. Ferrari, G. Fiorillo, D. Gibin, S. Gninenko, A. Guglielmi, M. Haranczyk, J. Holeczek, A. Ivashkin, J. Kisiel, I. Kochanek, J. Lagoda, S. Mania, A. Menegolli, G. Meng, C. Montanari, S. Otwinowski, A. Piazzoli, P. Picchi, F. Pietropaolo, P. Plonski, A. Rappoldi, G. L. Raselli, M. Rossella, C. Rubbia, P. Sala, E. Scantamburlo, A. Scaramelli, E. Segreto, F. Sergiampietri, D. Stefan, J. Stepaniak, R. Sulej, M. Szarska, M. Terrani, F. Varanini, S. Ventura, C. Vignoli, H. Wang, X. Yang, A. Zalewska, A. Zani, K. Zaremba, P. Álvarez Sanchez, L. Biagi, R. Barzaghi, B. Betti, C. De Gaetani, J. D. González Cobas, D. Passoni, L. Pinto, J. Serrano, P. Spinnato, M. G. Visconti, T. Wlostowski

摘要:

在2012年5月,CERN-CNGS中微子束已经在聚束模式下运行了两周,总共有1.8 10^17 pot,具有3 ns窄宽度质子束团,间隔100 ns。这种紧密聚束的束结构允许在事件基础上非常精确地测量从CERN到LNGS的中微子飞行时间。ICARUS-T600 PMT-DAQ和CERN-LNGS的定时同步在这次活动中得到了很大的改进,这是利用了CERN和LNGS的额外独立GPS接收机以及CERN和LNGS的“白兔”协议的部署。ICARUS-T600探测器已经收集了25个与束流相关的事件;使用所有不同的时间同步路径,已经准确地评估了相应的飞行时间。测量的中微子飞行时间与所有速度与光速相当的事件的到达是一致的:基于光速的预期值与测量值之间的差异是tof_c - tof_nu =(0.10 \pm 0.67 stat. \pm 2.39系统)ns。这一结果与ICARUS协作组先前报告的值tof_c - tof_nu =(0.3 \pm 4.9 stat. \pm 9.0系统)ns,但具有改进的统计误差和系统误差。

英文摘要:

During May 2012, the CERN-CNGS neutrino beam has been operated for two weeks for a total of 1.8 10^17 pot in bunched mode, with a 3 ns narrow width proton beam bunches, separated by 100 ns. This tightly bunched beam structure allows a very accurate time of flight measurement of neutrinos from CERN to LNGS on an event-by-event basis. Both the ICARUS-T600 PMT-DAQ and the CERN-LNGS timing synchronization have been substantially improved for this campaign, taking ad-vantage of additional independent GPS receivers, both at CERN and LNGS as well as of the deployment of the "White Rabbit" protocol both at CERN and LNGS. The ICARUS-T600 detector has collected 25 beam-associated events; the corresponding time of flight has been accurately evaluated, using all different time synchronization paths. The measured neutrino time of flight is compatible with the arrival of all events with speed equivalent to the one of light: the difference between the expected value based on the speed of light and the measured value is tof_c - tof_nu = (0.10 \pm 0.67stat. \pm 2.39syst.) ns. This result is in agreement with the value previously reported by the ICARUS collaboration, tof_c - tof_nu = (0.3 \pm 4.9stat. \pm 9.0syst.) ns, but with improved statistical and systematic errors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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