89 research outputs found
Advanced particle physics
No full textProviding a complete foundation to comprehend the physics of the microworld, Advanced Particle Physics, Two-Volume Set develops the models, theoretical framework, and mathematical tools to understand current experiments and make predictions for future experiments. The set brings together a vast array of topics in modern particle physics and distills the material in a rigorous yet accessible manner. All intermediate mathematical steps are derived and numerous application examples help readers gain a thorough, working knowledge of the subject. The first volume on particles, fields, and quantum electrodynamics covers: The mathematical foundation of quantum field theory The interactions and particles of the Standard Model How accelerators, detectors, and neutrino telescopes are used in particle physics experiments The technique of renormalization in quantum electrodynamics The second volume on the Standard Model and beyond discusses: The technique of renormalization in quantum chromodynamics (QCD) The status of current QCD experiments Physics beyond the Standard Model, including composite models and a left-right model How solar and atmospheric neutrinos are detected and analyzed The books in this two-volume set enable readers not only to perform complicated and skilled calculations, but also to propose and elaborate new theories. Each book contains extensive references that offer a comprehensive perspective on the literature and historical development of particle physics
Advanced Particle Physics, Volume I: Particles, Fields, and Quabtum Electrodynamics
No full textThe textbook consists of four Parts. The Part I covers the mathematical basis of the modern quantum field theory. The most necessary knowledge of the group theory are provided for, Noether theorem is proved and the major motion integrals to be connected with both space and internal symmetry are deduced. In the Part II fundamental interactions and the ways of their unifications are discussed. The main theoretical preconditions and experiments that allowed one to establish matter structure at the quark-lepton level are considered. In the Part III the secondary quantized theories of free fields with spin 0, 1/2 and 1 are inves-tigated. A special attention is attached to the neutrino field. The Part IV is devoted to the first successfully operating quantum field theory, the quantum electrodynamics. In this Part the methods of calculations with polarized and unpolarized particles with and without inclusion of radiative corrections are yielded
Advanced Particle Physics, Volume II: The Standard Model and Beyond
No full textThe second volume on the Standard Model and beyond discusses: The technique of renormalization in quantum chromodynamics (QCD); The status of current QCD experi-ments; Physics beyond the Stan-dard Model, including composite models and a left-right model; How solar and atmospheric neutrinos are detected and analyzed.
The book enables readers not only to perform complicated and skilled calculations, but also to propose and elaborate new theories. The book contains extensive references that offer a comprehensive pers-pective on the literature and histo-rical development of particle physics
Neutrino oscillations in vortex and twisting magnetic fields
Get PDFThe behavior of the neutrino flux in vortex and twisting magnetic fields is
considered within the left-right symmetric model. By way of illustration of the
magnetic fields we discuss the magnetic fields of the coupled sunspots (CS's)
which are the sources of the future solar flares. It is expected that the
neutrinos have such multipole moments as the charge radius, the magnetic and
anapole moments. The evolution equation in the Schrodinger-like form is found
and all magnetic-induced resonance conversions are analyzed. It is demonstrated
that in the case of the high-energy flares the sizeable depletion of the
neutrinos caused by their resonance absorptions takes place.
Possibilities of observations of this phenomena are investigated at neutrino
telescopes whose work is based on the reaction of the coherent elastic
neutrino-nucleus scattering.Comment: 25 page
Processes with the lepton flavor violation at muon colliders
Get PDFWithin the framework of the left-right model, the processes of pair production of the W−- bosons are investigated. These processes going with the lepton flavor violation may be detected at muon colliders both in the regime of a fixed electron target and in the regime of colliding muon beams. In the second order of the perturbation theory the cross sections of these processes are calculated for the polarized initial particles. It is shown that their cross sections are quite large and are grown with increasing the heavy neutrino mass. The problems connected with detecting these processes are discussed
Предсказание солнечных вспышек с помощью нейтринных детекторов второго поколения
Get PDFIn this paper, we propose a physics-based method of prediction high-energy solar flares (SFs) with the help of neutrino detectors utilizing coherent elastic neutrino-nucleus scattering (CEνNS). The behavior of neutrino beams passing through coupled sunspots (CSs) being the sources of future SFs is investigated. We consider the evolution of left-handed electron neutrino νeL and muon neutrino νμL beams formed in the convective zone after the passage of the Micheev – Smirnov – Wolfenstein resonance. It is assumed that the neutrinos possess the charge radius, the magnetic and anapole moments while the CS magnetic field is vortex, nonhomogeneous and has twisting. Estimations of the weakening of the neutrino beams after traversing the resonant layers are given. It is shown that for SFs this weakening could be registered by neutrino detectors of the second generation only when neutrinos have the Dirac nature. Предлагается физически обоснованный метод прогнозирования суперсолнечных вспышек с помощью нейтринных детекторов, работа которых основана на использовании когерентного упругого рассеяния нейтрино на ядрах. Исследуется поведение нейтринных пучков, проходящих через спаренные солнечные пятна, которые являются источниками будущих солнечных вспышек. Рассматривается эволюция пучка левосторонних электронных нейтрино и пучка левосторонних мюонных нейтрино, которые образовались в конвективной зоне после прохождения резонанса Михеева – Смирнова – Вольфенштейна. Предполагается, что нейтрино обладает такими мультипольными моментами, как зарядовый радиус, магнитный и анапольный моменты, в то время как магнитное поле спаренных солнечных пятен является вихревым, неоднородным и обладает скручиванием. Даются оценки ослабления нейтринных пучков после прохождения резонансных переходов. Показывается, что в случае суперсолнечных вспышек эти ослабления могут быть зарегистрированы нейтринными детекторами второго поколения только тогда, когда нейтрино имеет дираковскую природу.
VIBRATIONAL DEPENDENCE OF THE TORSIONAL BARRIER HEIGHT AND THE A/B INTENSITY EVOLUTION IN THE OH OVERTONE SPECTRA OF METHANOL.
No full textO. V. Boyarkin, T. R. Rizzo and David S. Perry, J. Chem. Phys. 110, 11359 (1999). M. Quack and M. Willeke, J. Chem. Phys. 110, 11958 (1999).Author Institution: Department of Physical Sciences, University of New Brunswick; Department of Chemistry, University of AkronRizzo and co- have used supersonic-jet infrared-laser-assisted photofragment spectroscopy (IRLAPS) to record the O---H stretching overtone spectra of . Their analysis of the rotation-torsion structures revealed the following interesting features: (i) the torsional A-E splitting decreases monotonically as increases, indicating increase of the torsional barrier height , (ii) a-type transitions become dominant at higher excitations of the OH stretching vibration, (iii) a 1:1 anharmonic resonance occurs between the OH stretch and CH stretch vibrations, reaching its maximum in the region. The third observation has been recently studied by Quack and for the case of , by means of ab initio five-dimensional potential energy and dipole moment surfaces. The present contribution explores possible ab initio explanations for the first two observations. At the MP2 level with 6-311G+(3df,2p) basis set, effective one-dimensional functions for the potential energy, dipole moment ( and directions), barrier height and torsional constant have been obtained by scanning the O---H bond length in order to take into account the mechanical and electrical anharmonicities. All ab initio quantities have been expressed as Taylor expansions in the dimensionless coordinate, q. Calculations have been carried out in the harmonic basis set to yield vibrational energies and eigenfunctions. The latter have been used to compute the patterns of the barrier height , the torsional constant F, and the evolution of the infrared intensity ratio , as functions of the OH vibrational quantum number. All our ab initio results agree with the experimental observations in points (i) and (ii) above. Details of the calculations, the corresponding results and the comparison to experimental data will be presented
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