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Author: Ryan David Bayes Publisher: ISBN: Category : Languages : en Pages :
Book Description
The search for lepton flavour violation is significant to our understanding of the standard model of particle physics. This measurement uses the muon decay data collected by the TWIST experiment at TRIUMF to search for lepton flavour violation between charged lepton species. Specifically, I searched for the decay?+?e+X0, where X? is an unknown, undetected, neutral boson, against a background of stan?dard muon decays,?+?e+vev? I set branching ratios for these decays such that B(?+?e+X0)
Author: Ryan David Bayes Publisher: ISBN: Category : Languages : en Pages :
Book Description
The search for lepton flavour violation is significant to our understanding of the standard model of particle physics. This measurement uses the muon decay data collected by the TWIST experiment at TRIUMF to search for lepton flavour violation between charged lepton species. Specifically, I searched for the decay?+?e+X0, where X? is an unknown, undetected, neutral boson, against a background of stan?dard muon decays,?+?e+vev? I set branching ratios for these decays such that B(?+?e+X0)
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The search for lepton flavour violation is significant to our understanding of the standard model of particle physics. This measurement uses the muon decay data collected by the TWIST experiment at TRIUMF to search for lepton flavour violation between charged lepton species. Specifically, I searched for the decay æ+2!+X0, where X° is an unknown, undetected, neutral boson, against a background of stanƠdard muon decays, æ+2!+vevæ I set branching ratios for these decays such that B(æ+2!+X0)
Author: Ryan David Bayes Publisher: ISBN: Category : Languages : en Pages :
Book Description
The study of the muon decay process?+? e+?e??? is a powerful constraint on the behaviour of the weak interaction, without contamination of the other, stronger, fundamental interactions. The spectrum measured from the momentum and angles of the decay positrons is parametrized using a set of four decay parameters. The purpose of the TWIST experiment is to measure these decay parameters to an unprecedented precision; an order of magnitude improvement in the uncertainties over measurements completed before the TWIST experiment. Measurements of the muon decay parameters constrain the values of a series of 19 weak coupling constants. In the standard model, V-A weak interaction, 18 of these constants are 0, while the remaining constant describes interactions between left handed particles, gV_LL= 1. The decay parameter? quantifies the behaviour of the spectrum with respect to momentum. According to the standard model the value of this parameter is 3/4. TWIST measured a value of? = 0.74991?0.00009(stat)?0.00028(sys). The measurement is limited by its systematic uncertainty, so a large focus of the experiment was on the determination and control of these uncertainties. The systematic uncertainties are derived from uncertainties in the detector construction and uncertainties in the biases generated by differences between the data and a matching Monte Carlo. Muon decay also limits the possibility of family symmetry breaking interactions. TWIST can be used to search for the possibility of muons decaying into a positron and a single unidentified neutral particle?+? e+X0 that does not otherwise interact with normal matter. The large momentum and angle acceptance of the TWIST spectrometer allows for searches of two body decays for masses of the X0 boson mX0? [0,80] MeV/c, with a variety of behaviours with respect to the angle of the positron track. Upper limits on massive and mass-less X0 decays are set with a 90% confidence level separately at parts per million for massive decays and parts in 10000 for mass-less decays.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The study of the muon decay process + e+e is a powerful constraint on the behaviour of the weak interaction, without contamination of the other, stronger, fundamental interactions. The spectrum measured from the momentum and angles of the decay positrons is parametrized using a set of four decay parameters. The purpose of the TWIST experiment is to measure these decay parameters to an unprecedented precision; an order of magnitude improvement in the uncertainties over measurements completed before the TWIST experiment. Measurements of the muon decay parameters constrain the values of a series of 19 weak coupling constants. In the standard model, V-A weak interaction, 18 of these constants are 0, while the remaining constant describes interactions between left handed particles, gV_LL= 1. The decay parameter quantifies the behaviour of the spectrum with respect to momentum. According to the standard model the value of this parameter is 3/4. TWIST measured a value of = 0.749910.00009(stat)0.00028(sys). The measurement is limited by its systematic uncertainty, so a large focus of the experiment was on the determination and control of these uncertainties. The systematic uncertainties are derived from uncertainties in the detector construction and uncertainties in the biases generated by differences between the data and a matching Monte Carlo. Muon decay also limits the possibility of family symmetry breaking interactions. TWIST can be used to search for the possibility of muons decaying into a positron and a single unidentified neutral particle + e+X0 that does not otherwise interact with normal matter. The large momentum and angle acceptance of the TWIST spectrometer allows for searches of two body decays for masses of the X0 boson mX0 [0,80] MeV/c, with a variety of behaviours with respect to the angle of the positron track. Upper limits on massive and mass-less X0 decays are set with a 90% confidence level separately at parts per million for massive decays and parts in.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
A maximum likelihood method was developed for extracting the Michel parameters, which describe the decay spectrum of stopped polarized muons. The method was applied successfully in a Monte Carlo simulation of apparatus. A complete error matrix for the set of Michel parameters was also obtained. In an experiment of 108 muon decays the statistical errors can be reduced by more than an order of magnitude over the currently accepted limits on the Michel parameters. 5 tables.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
A brief summary is given on progress in producing an experimental apparatus, called the Crystal Box detector, for searching for extremely rare decay modes of the muon (those decays violating lepton number conservation). The Crystal Box consists of a large solid angle modular NaI(Tl) detector enclosing a cylindrical set of drift chambers and a trigger hodoscope. Associated electronic equipment is also described briefly. (LEW).
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
A search has been performed for the decays .mu. .-->. eee, .mu. .-->. e.gamma., and .mu. .-->. e.gamma gamma. with a sensitivity in the branching ratios at the level of 10−1°. The experiment used a separated, 26 MeV/c .mu./sup +/ beam with an average intensity of 300kHz. A total of 2.2 x 1011 muon decays were examined for the present result. The detector for the experiment is the Crystal Box, which consists of a cylindrical drift chamber surrounded by 396 NaI(T1) crystals. A layer of scintillation counters in front of the crystals provided timing for electrons and veto for photons. The energy resolution for electrons and photons is approx. 6% (FWHM). The position resolution of the drift chamber is 350 .mu.m leading to a vertex cut with a rejection of 103 for .mu. .-->. eee. The timing resolution is approx. 300 ps the scintillators and approx. 1 ns from the crystals. No candidate for .mu. .-->. eee has been found, yielding an upper limit for the branching ratio of B/sub .mu. 3e/
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
We report on a search for the lepton family-number-nonconserving decays ..mu ... -->..ee−e+, ..mu..+..-->..e+..gamma.., and ..mu..+..-->..e+..gamma gamma.., using the Crystal Box detector at LAMPF. The experiment was run in the stopped muon channel at LAMPF during the winter and summer of 1984. Muons were stopped in the middle of a detector system consisting of a cylindrical drift chamber, a plastic scintillator hodoscope, and a segmented array of sodium iodide crystals. The sodium iodide surrounded the hodoscope and drift chamber. Events consistent with any of the above decays were recorded. The off-line data analysis imposed requirements on the timing, vertex location, and energy and momentum conservation for each event. Radioactive sources, conventional muon decay spectra, and photons from the process ..pi..−p..-->..n..gamma.. and ..pi..−p..-->..n..pi..° were used to provide energy calibration and resolution estimates. The inner bremsstrahlung processes ..mu..+..-->.. e+..gamma nu..anti..nu.. and ..mu..+..-->..e+e−e+..nu..anti..nu.. were observed at the expected rates. Details of the detector, the data analysis, and our latest bounds for the branching ratios will be presented. 33 figs.
Author: Ryan David Bayes
Author: Ryan David Bayes
Author: ![Measurement of the Decay Parameter [rho] and a Search for Non-Standard Model Decays in the Muon Decay Spectrum PDF](https://books.google.com/books/content/images/frontcover/hARpnQAACAAJ?fife=w80-h100)
Author: Ryan David Bayes
Author: [decays To] E(+̳)+[gamma] PDF](https://books.google.com/books/content/images/frontcover/RY6cHAAACAAJ?fife=w80-h100)
Author: Philip Michael Tuts![Exotic Muon Decay [mu] --> E + X PDF](https://books.google.com/books/content/images/frontcover/qn0GSwAACAAJ?fife=w80-h100)
Author: Bryman, Douglas
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