TY - GEN
T1 - First results from the MuLan and MuCap experiments
AU - Banks, T. I.
N1 - Funding Information:
The Confederation of Indian Industry (CII) and Exim Bank in India have come together and have instituted CII-Exim Excellence award in India based exactly on the European Model for Excellence as explained above. Many Indian companies are applying this model as shown in Figure 2 for moving towards Business Excellence and making their companies competitive and world class. This was instituted in 1994 and is considered to be the most prestigious award in India for Business Excellence that an Indian company can receive. The award is being administered by CII with the technical support from the European Foundation for Quality Management, (EFQM), and Brussels. The Award was established to promote the Awareness of business excellence as an increasingly important element in competitiveness.
PY - 2008
Y1 - 2008
N2 - MuLan and MuCap are ongoing experiments at the Paul Scherrer Institut, Switzerland, that use the muon lifetime to determine fundamental weak interaction parameters. The goal of MuLan is a 1 ppm measurement of the positive muon lifetime τμ+ to determine the Fermi constant G F to 0.5 ppm. The goal of MuCap is to make a 1% determination of the rate ΛS of the process of nuclear muon capture by the proton, μp→nν, by measuring the μ- disappearance rate in hydrogen gas to 10 ppm and subtracting the world average for the μ+ decay rate. A 1% determination of the capture rate ΛS is of interest because it would enable a 7% determination of gP, the induced pseudoscalar coupling of the nucleon. In 2007, both experiments published first results based upon data collected by each in 2004. MuLan reported an 11 ppm μ+ lifetime measurement, τμ+=2.197013(24)μs, resulting in a new, 9.6 ppm world average, τμ+=2.197019(21)μs, which determines the Fermi constant, GF=1.166371(6)×10-5GeV-2, to 5 ppm. MuCap reported a 3% measurement of the muon capture rate from the hyperfine singlet ground state of the μp atom, ΛS=725.0±17. 4s-1, from which a 15% value for the pseudoscalar coupling, g P(q2=-0.88mμ2)=7.3±1.1, was extracted.
AB - MuLan and MuCap are ongoing experiments at the Paul Scherrer Institut, Switzerland, that use the muon lifetime to determine fundamental weak interaction parameters. The goal of MuLan is a 1 ppm measurement of the positive muon lifetime τμ+ to determine the Fermi constant G F to 0.5 ppm. The goal of MuCap is to make a 1% determination of the rate ΛS of the process of nuclear muon capture by the proton, μp→nν, by measuring the μ- disappearance rate in hydrogen gas to 10 ppm and subtracting the world average for the μ+ decay rate. A 1% determination of the capture rate ΛS is of interest because it would enable a 7% determination of gP, the induced pseudoscalar coupling of the nucleon. In 2007, both experiments published first results based upon data collected by each in 2004. MuLan reported an 11 ppm μ+ lifetime measurement, τμ+=2.197013(24)μs, resulting in a new, 9.6 ppm world average, τμ+=2.197019(21)μs, which determines the Fermi constant, GF=1.166371(6)×10-5GeV-2, to 5 ppm. MuCap reported a 3% measurement of the muon capture rate from the hyperfine singlet ground state of the μp atom, ΛS=725.0±17. 4s-1, from which a 15% value for the pseudoscalar coupling, g P(q2=-0.88mμ2)=7.3±1.1, was extracted.
KW - Fermi constant
KW - Muon capture
KW - Muon lifetime
KW - Pseudoscalar form factor
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U2 - 10.1063/1.2898992
DO - 10.1063/1.2898992
M3 - Conference contribution
AN - SCOPUS:40549114956
SN - 9780735405004
T3 - AIP Conference Proceedings
SP - 372
EP - 374
BT - Neutrino Factories, Superbeams and Betabeams - 9th International Workshop on Neutrino Factories, Superbeams, and Betabeams, NuFact 07
T2 - 9th International Workshop on Neutrino Factories, Superbeams, and Betabeams, NuFact 2007
Y2 - 6 August 2007 through 11 August 2007
ER -