The MINOS Experiment Simona Murgia Stanford University Niki

The MINOS Experiment Simona Murgia, Stanford University Niki Saoulidou, Fermilab Near Detector, Batavia, IL Far Detector, Soudan, MN Beneficial occupancy on March 10, 2004 Plane installation to begin April 13, 2004 Installation completed July 2003 Magnetized detector is collecting atmospheric data Upward going muon event Fully instrumented planes downstream 1 kton steel and scintillator calorimeter 105 m underground All 282 steel and 153 scintillator planes assembled. 5. 4 kton steel and scintillator calorimeter 710 m underground; 484 scintillator planes Partially instrumented planes upstream Detector Readout Near Detector Hall Use timing to discriminate upward vs downward • The active material is scintillator strips (extruded polystyrene) embedded with WLS fibers. ND 9 -plane system integration test • • MINOS Service Building Ø nm disappearance • Search for n oscillations by comparing near and far CC energy distributions. The estimated systematic uncertainty in En per 2 Ge. V bin is 2 -4%. 16 -channel photomultiplier tubes and Viking VA chip front-end electronics at the far detector. 64 -channel photomultiplier tubes and fast QIE front-end electronics for higher event rate at the near detector. M 16 M 64 Physics Goals • Precision measurement of Dm 2 and sin 22 q (<10%) Neutrino Beam • The ability to resolve the first minimum depends on the number of p. o. t. ØSearch for ne appearance limit on sin 22 q 13. . . or discovery Current Super. K Dm 2 favors low energy neutrino beam 90% C. L. exclusion contours 3 s discovery contours Physics data taking will begin April 2005!