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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Branching-ratio limits obtained with the Crystal Box detector are presented for the rare muon decays ..mu.. ..-->.. eee, ..mu.. ..-->.. e..gamma.., and ..mu.. ..-->.. e..gamma gamma ... These decays, which violate the conservation of separate lepton-family numbers, are expected to occur in many extensions to the standard model. We found no candidates for the decay ..mu.. ..-->.. eee, yielding an upper limit for the branching ratio of B/sub ..mu..3e/ 3.1 x 10−11 (90% C.L.). A maximum-likelihood analysis of the ..mu.. ..--.. e..gamma.. candidates yields an upper limit of B/sub ..mu..e..gamma../ 4.9 x 10−11 and an analogous analysis of ..mu.. ..--.. e..gamma gamma.. candidates gives an upper limit of B/sub ..mu..e..gamma gamma../
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Branching-ratio limits obtained with the Crystal Box detector are presented for the rare muon decays ..mu.. ..-->.. eee, ..mu.. ..-->.. e..gamma.., and ..mu.. ..-->.. e..gamma gamma ... These decays, which violate the conservation of separate lepton-family numbers, are expected to occur in many extensions to the standard model. We found no candidates for the decay ..mu.. ..-->.. eee, yielding an upper limit for the branching ratio of B/sub ..mu..3e/ 3.1 x 10−11 (90% C.L.). A maximum-likelihood analysis of the ..mu.. ..--.. e..gamma.. candidates yields an upper limit of B/sub ..mu..e..gamma../ 4.9 x 10−11 and an analogous analysis of ..mu.. ..--.. e..gamma gamma.. candidates gives an upper limit of B/sub ..mu..e..gamma gamma../
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
Some results are given for rare muon decay experiments currently running. Also, plans are discussed for rare kaon decay experiments. Some of the events sought come from processes which violate lepton flavor conservation. Several apparatuses used in the search are described. 35 references. (LEW).
Author: Hans Volker Klapdor Publisher: Springer Science & Business Media ISBN: 364271689X Category : Science Languages : en Pages : 1138
Book Description
Nuclear physics is presently experiencing a thrust towards fundamental phy sics questions. Low-energy experiments help in testing beyond today's stan dard models of particle physics. The search for finite neutrino masses and neutrino oscillations, for proton decay, rare and forbidden muon and pion de cays, for an electric dipole moment of the neutron denote some of the efforts to test today's theories of grand unification (GUTs, SUSYs, Superstrings, ... ) complementary to the search for new particles and symmetries in high-energy experiments. The close connections between the laws of microphysics, astrophysics and cosmology open further perspectives. This concerns, to mention some of them, properties of exotic nuclei and nuclear matter, and star evolution; the neutrino and the dark matter in the universe; relations between grand unification and evolution of the early universe. The International Symposium on Weak and Electromagnetic Interactions in Nuclei (W.E.LN. 1986)' held in Heidelberg 1-5 July 1986, in conjunction with the 600th anniversary of the University of Heidelberg, brought together experts in the fields of nuclear and particle physics, astrophysics and cosmol ogy.
Author: Publisher: ISBN: Category : Languages : en Pages : 18
Book Description
The author discusses the status of and prospects for the study of rare decays of kaons, muons, and pions. Studies of rare kaon decays are entering an interesting new phase wherein they can deliver important short-distance information. It should be possible to construct an alternative unitarity triangle to that determined in the B sector, and thus perform a critical check of the Standard Model by comparing the two. Rare muon decays are beginning to constrain supersymmetric models in a significant way, and future experiments should reach sensitivities which this kind of model must show effects, or become far less appealing.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
New experimental upper limits for the branching ratios of the lepton-family-number nonconserving decays .mu. .-->. e.gamma. and .mu.+ .-->. e+.gamma gamma. are presented. A new determination of .gamma., the ratio of pion axial-vector to vector form factors, from radiative pion decay is also reported. These results are from data taken with the Crystal Box detector at LAMPF.
Author: J. Caparthy Publisher: Nova Publishers ISBN: 9781594541759 Category : Science Languages : en Pages : 264
Book Description
Since its discovery in cosmic rays, the muon has played an important role in our understanding of nature. Muons are fundamental subatomic particle 207 times heavier than an electron. Accelerators and cosmic-ray collisions produce muons, but the particles quickly decay. That makes muons rare in nature. Muons possess a quantum mechanical property called spin, analogous to the twirling of a top. Because of this trait, muons behave like tiny bar magnets. Their spin also makes them into minute gyroscopes, responding to upward or downward forces by swinging the axes of spin around horizontally. The muon provides a rich variety of applications in diverse areas of science, including condensed matter physics and chemistry. High energy physicists are seriously considering the design and construction of a muon collider. Negatively misbehaving muons bolster earlier evidence of new physics beyond the standard model. Important international leading-edge research results are presented in this volume.
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Author: Philip Michael Tuts
Author: Hans Volker Klapdor
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Author: Charles C. H. Jui
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Author: J. Caparthy