Particle Physics Seminar
"The dual-readout technique for ORKA experiment at Fermilab"
Presented by Anna Mazzacane, FNAL
Monday, March 18, 2013, 3 pm
Small Seminar Room, Bldg. 510
ORKA is a proposed experiment at Fermilab to measure the ultra-rare decay K + â†'Ï€ + Î½Î½. This decay provides an excellent opportunity to test the SM prediction and many models of new physics which have mass scales beyond the reach of the LHC. This measurement also represents a significant experimental challenge. The main sources of background, the two body kaon decays K + â†' Ï€ + Ï€ 0 and K + â†' Î¼+ Î½, have branching ratios as much as 10 orders of magnitude larger than the signal and similar signatures. Therefore, the detector must have powerful Ï€ + particle identification and highly efficient four-solid- angle photon detection coverage. High photon veto efficiency must be achieved while minimizing acceptance losses due to vetoing on "accidental" detector activity. Photon detection efficiency can be maximized by a fully active, hermetic calorimeter with suffi-cient thickness in radiation lengths. I will present one of the calorimeter option for the ORKA experiment, the totally active ADRIANO calorimeter. It is based on the dual-readout technique that makes it possible to eliminate the effects of fluctuations which are an important contribution of the energy resolution. Work to simulate the performance of such a detector is ongoing and R&D of ADRIANO prototypes is in progress at Fermilab.