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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
This paper discusses the following topics on the muon plus decay; muon decay spectrum; previous determinations of?; experimental apparatus; distortions of the spectrum; and data analysis and results. 31 figs. (LSP).
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
This paper discusses the following topics on the muon plus decay; muon decay spectrum; previous determinations of?; experimental apparatus; distortions of the spectrum; and data analysis and results. 31 figs. (LSP).
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: Jose Feliciano Benitez Publisher: Stanford University ISBN: Category : Languages : en Pages : 320
Book Description
The absolute branching fractions for the decays $D^-_s\rightarrow\ell^-\bar{\nu}_{\ell}$ ($\ell=e$, $\mu$, or $\tau$) are measured using a data sample corresponding to an integrated luminosity of 521 fb$^{-1}$ collected at center of mass energies near 10.58 GeV with the BABAR detector at the PEP-II $e^+e^-$ collider at SLAC. The number of $D_s^-$ mesons is determined by reconstructing the recoiling system $DKX\gamma$ in events of the type $e^+e^-{\rightarrow}DKXD^{*-}_s$, where $D^{*-}_s\rightarrow D^-_s\gamma$ and $X$ represents additional pions from fragmentation. The $D^-_s\rightarrow\ell^-\nu_{\ell}$ events are detected by full or partial reconstruction of the recoiling system $DKX\gamma\ell$. The following results are obtained: $B(D^-_s \to \mu^- \nu) = (6.02 \pm 0.38 \pm 0.34) \times 10^{-3}$, $B(D^-_s \to \tau^- \nu) = (5.00 \pm 0.35 \pm 0.49) \times 10^{-2}$, and $B(D^-_s \to e^- \nu)
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: James Raymond Musser Publisher: ISBN: Category : Languages : en Pages :
Book Description
The TWIST Collaboration has measured the Michel parameter [rho] in normal muon decay, [mu] --> [epsilon]v[subscript epsilon]v̄[subscript mu]. In the standard model of particle physics, [rho] = 3/4. Deviations from this value require mixing of left- and right-handed muon and electron couplings in the muon-decay Lagrangian. We find [rho] = 0.75080 "0.00032(stat.)"0.00097(syst.) "0.00023, where the last uncertainty represents the dependence of [rho] on the Michel parameter [eta]. This result sets new limits on the W[subscript]L - W[subscript]R mixing angle in left-right symmetric models.
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Author: Lê Dong![Measurement of the K[mu] decay parameters PDF](https://books.google.com/books/content/images/frontcover/6rSJXwAACAAJ?fife=w80-h100)
Author: CERN.
Author: Ryan David Bayes![Measurement of [Xi]− Polarization and Decay Parameters in [Xi]− [arrow] [lambda][pi]− Decay PDF](https://books.google.com/books/content/images/frontcover/hB4qAAAAYAAJ?fife=w80-h100)
Author: Melin Huang![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: Jose Feliciano Benitez
Author: ![Measurement of the Michel Parameter [rho] in Muon Decay PDF](https://books.google.com/books/content/images/frontcover/dqO_jwEACAAJ?fife=w80-h100)
Author: James Raymond Musser
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