Final results on the low-energy νμ -flux measurement with MACRO

Details Final results on the low-energy νμ -flux measurement with MACRO Final results on the low-energy νμ -flux measurement with MACRO

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....3.1077s&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

The MACRO experiment has studied the flux of atmospheric muon neutrinos in the GeV-range through the detection of νµ interactions inside the apparatus, and also through the detection of upward-going, stopping muons. We present the analysis of the full data sample (from Spring 1994 up to the end of 2000). The measured flux shows a deficit with respect to the Monte Carlo predictions. We interpret the deficit in terms of neutrino oscillations, and we present the allowed region in the oscillation parameter space. The preferred values of oscillation parameters are in agreement with those obtained in the analysis of the higher energy data set of upward throughgoing muons. 1 MACRO as a atmospheric νµ detector The MACRO detector (Ahlen, 1995) is a large rectangular box (76.6 m× 12 m× 9.3 m) whose active detection elements are planes of streamer tubes for tracking and liquid scintillation counters for fast timing. The lower half of the detector is filled with streamer tube planes alternating with trays of crushed rock absorber, while the upper part is open. The crushed rock provides most of the 5.3 kton target mass for partially-contained neutrino interactions. The neutrino oscillations are studied using three neutrino event topologies, shown in Fig. 1: Up throughgoing events (median neutrino energy ˜ 50 GeV) (Ahlen, 1995; Ambrosio, 1998; Montaruli, 2001) induced by neutrinos in the rock below the detector; Internal Up events and Internal Down + Up Going Stopping events (both with median neutrino energy ˜ 4 GeV) (Ambrosio, 2000; Spurio, 2001). Here we present the results for the low energy events (Eν ˜ 4 GeV). A global reanalysis to combine all experimental data sets and to reduce the systematic errors is in progress. The Internal Up events are induced by neutrinos interacting in the lower part of the apparatus. The upgoing muon is detected by the two upper layers of liquid scintillation counters and

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