Abstract
In the DeeMe experiment, approximately 70\ \mathrm{GHz/mm^{2}}70GHz/mm2 prompt-charged particles will hit the multi-wire proportional chambers (MWPCs) between signal read-out periods. To avoid the space charge effect, we developed fast HV-switching MWPCs in order to control the gas gain dynamically. Four such MWPCs have been manufactured. The circuit of readout amplifiers is slightly modified to further improve the efficiency of the detector, and we also started to investigate other possible choices of the gas mixture. In this article, the development of the detectors and results of performance tests will be presented.
Highlights
The DeeMe experiment is planned to search for muon-to-electron (μ-e) conversion in the nuclear field at J-PARC Materials and Life Science Experimental Facility (MLF) H Line
The momenta of charged particles are measured by it, which consists of a magnet and four multi-wire proportional chambers (MWPCs)
The DeeMe experiment aims to search for μ-e conversion with a single event sensitivity of 1 × 10−13 for a graphite target down to 2 × 10−14 for a silicon carbide target
Summary
The DeeMe experiment is planned to search for muon-to-electron (μ-e) conversion in the nuclear field at J-PARC Materials and Life Science Experimental Facility (MLF) H Line (see Fig. 1 and 2). Our goal is to reach a single event sensitivity of < 1 × 10−13 for a graphite target or < 2 × 10−14 for a silicon carbide target with operating the Rapid Cycling Synchrotron (RCS) at a power of 1 MW for 2 × 107 sec/year This will improve the sensitivity by one or two orders of magnitude than those achieved so far. Μ-e conversion is coherent neutrino-less conversion of a muon into an electron in the nuclear field μN→ eN. It is one of charged lepton flavor violating (cLFV) processes, which are forbidden in the Standard Model (SM). The energy of signal electron is approximately 105 MeV, which the mass of muon is converted to
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