CheukKai Becket Hui · Texas ScholarWorks (Texas Digital Library) · 2017
The Mayan Muon Tomography Project of the UT High Energy Physics Laboratory is in collaboration with UT Mesoamerican Archaeological Laboratory to explore a Maya pyramid in Belize. The detectors in this project will use cosmic ray muons, and thus unintrusively, to create tomographic images of the internal structures of the pyramid. A prototype muon detector has been completed and commissioned in early 2007. Currently, the Maya Muon group is studying various aspects of the detector in preparation for its service in Belize. Muon track reconstruction, imaging technique and data simulation have been studied and will be discussed here.
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J. Gallardo · University of North Texas Digital Library (University of North Texas) · 1996
A feasibility study is presented of a 2 + 2 TeV muon collider with a luminosity of L = 10{sup 35} cm{sup -2}s{sup -1}. The resulting design is not optimized for performance, and certainly not for cost; however, it does suffice - we believe - to allow us to make a credible case, that a muon collider is a serious possibility for particle physics and, therefore, worthy of R and D support so that the reality of, and interest in, a muon collider can be better assayed. The goal of this support would be to completely assess the physics potential and to evaluate the cost and development of the necessary technology. The muon collider complex consists of components which first produce copious pions, then capture the pions and the resulting muons from their decay; this is followed by an ionization cooling channel to reduce the longitudinal and transverse emittance of the muon beam. The next stage is to accelerate the muons and, finally, inject them into a collider ring wich has a small beta function at the colliding point. This is the first attempt at a point design and it will require further study and optimization. Experimental work will be needed to verify the validity of diverse crucial elements in the design. Muons because of their large mass compared to an electron, do not produce significant synchrotron radiation. As a result there is negligible beamstrahlung and high energy collisions are not limited by this phenomena. In addition, muons can be accelerated in circular devices which will be considerably smaller than two full-energy linacs as required in an e{sup +} - e{sup -} collider. A hadron collider would require a CM energy 5 to 10 times higher than 4 TeV to have an equivalent energy reach. Since the accelerator size is limited by the strength of bending magnets, the hadron collider for the same physics reach would have to be much larger than the muon collider. In addition, muon collisions should be cleaner than hadron collisions. There are many detailed particle reactions which are open to a muon collider and the physics of such reactions - what one learns and the necessary luminosity to see interesting events - are described in detail. Most of the physics accesible to an e{sup +} - e{sup -} collider could be studied in a muon collider. In addition the production of Higgs bosons in the s-channel will allow the measurement of Higgs masses and total widths to high precision; likewise, t{bar t} and W{sup +}W{sup -} threshold studies would yield m{sub t} and m{sub w} to great accuracy. These reactions are at low center of mass energy (if the MSSM is correct) and the luminosity and {Delta}p/p of the beams required for these measurements is detailed in the Physics Chapter. On the other hand, at 2 + 2 TeV, a luminosity of L {approx} 10{sup 35} cm{sup -2}s{sup -1} is desirable for studies such as, the scattering of longitudinal W bosons or the production of heavy scalar particles. Not explored in this work, but worth noting, are the opportunities for muon-proton and muon-heavy ion collisions as well as the enormous richness of such a facility for fixed target physics provided by the intense beams of neutrinos, muons, pions, kaons, antiprotons and spallation neutrons. To see all the interesting physics described herein requires a careful study of the operation of a detector in the very large background. Three sources of background have been identified. The first is from any halo accompanying the muon beams in the collider ring. Very carefully prepared beams will have to be injected and maintained. The second is due to the fact that on average 35% of the muon energy appears in its decay electron. The energy of the electron subsequently is converted into EM showers either from the synchrotron radiation they emit in the collider magnetic field or from direct collision with the surrounding material. The decays that occur as the beams traverse the low beta insert are of particular concern for detector backgrounds. A third source of background is e{sup +} - e{sup -} pair creation from {mu}{sup +} - {mu}{sup -} interaction. Studies of how to shield the detector and reduce the background are addressed in the Detector Chapter. Polarization of the muons allows many very interesting measurements which are discussed in the Physics Chapter. Unlike the electron collider in which the electron beam is highly polarized and the positron beam unpolarized, both muon beams may be partially polarized. It is necessary to select forward moving muons from the pion's decay and thus reduce the available number of muons and hence the luminosity. The necessary machine technology needed to achieve such a collider is discussed in the Option Chapter; at the moment it is not part of our point design, although such capability would almost certainly be incorporated into an actual device.
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Bernhard Lauss · AIP conference proceedings · 2004
We present an introduction to the MuLAN and MuCAP experiments at PSI, which aim at high precision determinations of two fundamental Weak Interactions parameters: the Fermi constant GF and the induced pseudoscalar form factor gp, respectively.
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Vladimir Shiltsev · 2023
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Salvatore A. Tupputi, M. Abbrescia, A. Colaleo et al. · 2012
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A. B. Arbuzov · 2001
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2025
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A. B. Arbuzov · 2001
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Fisk H. Eugene, Para Adam · International Linear Collider · 2011
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A. B. Arbuzov · 2001
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Hongxin Wang, Lei Wang, Yang Zhang · SHILAP Revista de lepidopterología · 2021
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Van Nostrand's Encyclopedia of Chemistry · 2005
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Marcello Piccolo · International Linear Collider · 2007
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D'Ascenzo Nicola · International Linear Collider · 2010
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Schmidt, B · CERN Bulletin · 1999
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Fred Jegerlehner · Springer Link (Chiba Institute of Technology) · 2018
\nI present a status report of the hadronic vacuum polarization effects for the muon g–2, to be considered as an update of [1]. The update concerns recent new inclusive R measurements from KEDR in the energy range 1.84 to 3.72 GeV. For the leading order contributions I find αμhad1=688.07±4.14688.77±3.38×10−10 based on e+e- data [incl. τ data], αμhad2=−9.93±0.07×10−10 (NLO) and αμhad3=1.22±0.01×10−10 (NNLO). Collecting recent progress in the hadronic light-by-light scattering I adopt π0, η, η' [95 ± 12] + axial-vector [8 ± 3] + scalar [-6 ± 1] + π, K loops [-20 ± 5] + quark loops [22 ± 4] + tensor [1 ± 0] + NLO [3 ± 2] which yields αμ6lbl, had=103±29×10−11. With these updates I find αμexp−αμthe=31.3±7.7×10−10 a 4.1 σ deviation. Recent lattice QCD results and future prospects to improve hadronic contributions are discussed.\n
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2003
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Markus Bach, Dominik Stöckinger, Hyejung Stöckinger-Kim et al. · Springer Link (Chiba Institute of Technology) · 2016
Recent new results on the SM and the SUSY prediction for the muon (g – 2) are briefly reviewed, and a SUSY scenario with particularly large contributions is discussed.
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Zutshi Vishnu Vikhyat · International Linear Collider · 2009
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Yamazaki, Takayuki, Adachi, Toshikazu, Goto, Akira et al. · JACOW · 2020
A transmission muon microscope is an unprecedented tool which enables its users to reconstruct 3D image of samples such as a living cell. Muons can gain penetrative power as their energy increase, though electrons above 1 MeV start to trigger electromagnetic showers and protons above 1 GeV cause nuclear reactions. Muons accelerated up to about 5 MeV are able to penetrate a living cell (~ 10 um), which is impossible with ultra-high voltage (1 MeV) electron microscopes. In order to accelerate muons, efficient acceleration is necessary because the lifetime of muons is only 2.2 us. In addition, it is important to accelerate muons without increasing their energy dispersion. A cyclotron with a flat-top acceleration system is the best suited for the transmission muon microscope and is being developed at the J-PARC muon facility (MUSE). In this poster, the transmission muon microscope project and the development of the muon cyclotron will be presented.
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