Experimental search for the LSND anomaly with the ICARUS LAr-TPC detector in the CNGS beam

3rd Symposium on Prospects in the Physics of Discrete Symmetries

Segreto, E.^1

Laboratori Nazionali Del Gran Sasso, S.S. 17 bis Km 18,910, 67100 Assergi (AQ), Italy^1

关键词: Confidence levels;    Energy interval;    Imaging detector;    MiniBooNE;    Novel design;    Oscillation probabilities;    Positive signals;    Remaining effects;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/447/1/012064/pdf
DOI  :  10.1088/1742-6596/447/1/012064

来源: IOP

【 摘 要 】

We report an early result from ICARUS (CNGS2), the large mass LAr-TPC, a Gargamelle class imaging detector of novel design. A search of a vμ → νe signal due to a LSND anomaly at the Gran Sasso Laboratory, located at a distance of L 730 km from CERN is hereby presented. Such an anomaly, in which an electron is produced by neutrinos in the energy interval 0 ≤ Ev ≤ 30 GeV, will be characterized by a fast energy oscillation averaging closely to sin2(1.27Δm2newL/Ev) 1/2 and therefore approximately with probability . The presence of such a signal will be compared with the small but significant backgrounds due to other and more conventional neutrino origins. Within the range of our observations, our result is compatible with the absence of a LSND anomaly. At 90% and 99% confidence levels the limits on the oscillation probabilities are and respectively. The present result strongly limits the window of opened options for the LSND anomaly, reducing the remaining effect to a narrow region centered around (Δm2, sin2(2θ)) (0.5 eV2,0.05) where there is an over-all agreement (at 90 % CL) between the present ICARUS limit, the published limits of KARMEN and the published positive signals of LSND and MiniBooNE collaborations.