Two-photon Physics
Author | : F. Kapusta |
Publisher | : World Scientific |
Total Pages | : 358 |
Release | : 1994 |
Genre | : Colliders |
ISBN | : 981453384X |
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Author | : F. Kapusta |
Publisher | : World Scientific |
Total Pages | : 358 |
Release | : 1994 |
Genre | : Colliders |
ISBN | : 981453384X |
Author | : |
Publisher | : |
Total Pages | : 34 |
Release | : 2007 |
Genre | : |
ISBN | : |
Two-photon exchange contributions to elastic electron-scattering are reviewed. The apparent discrepancy in the extraction of elastic nucleon form factors between unpolarized Rosenbluth and polarization transfer experiments is discussed, as well as the understanding of this puzzle in terms of two-photon exchange corrections. Calculations of such corrections both within partonic and hadronic frameworks are reviewed. In view of recent spin-dependent electron scattering data, the relation of the two-photon exchange process to the hyperfine splitting in hydrogen is critically examined. The imaginary part of the two-photon exchange amplitude as can be accessed from the beam normal spin asymmetry in elastic electron-nucleon scattering is reviewed. Further extensions and open issues in this field are outlined.
Author | : |
Publisher | : |
Total Pages | : 5 |
Release | : 2001 |
Genre | : |
ISBN | : |
Exclusive hadron production processes in photon-photon collisions provide important tests of QCD at the amplitude level, particularly as measures of hadron distribution amplitudes and skewed parton distributions. The determination of the shape and normalization of the distribution amplitudes has become particularly important in view of their importance in the analysis of exclusive semi-leptonic and two-body hadronic B-decays. Interesting two-photon physics, including doubly-tagged [gamma]*[gamma]* reactions, will be accessible at low energy, high luminosity ee− colliders, including measurements of channels important in the light-by-light contribution to the muon g-2 and the study of the transition between threshold production controlled by low-energy effective chiral theories and the domain where leading-twist perturbative QCD becomes applicable. The threshold regime of hadron production in photon-photon and ee− annihilation, where hadrons are formed at small relative velocity, is particularly interesting as a test of low energy theorems, soliton models, and new types of resonance production. Such studies will be particularly valuable in double-tagged reactions where polarization correlations, as well as the photon virtuality dependence, can be studied.
Author | : T. Munehisa |
Publisher | : |
Total Pages | : 23 |
Release | : 1995 |
Genre | : |
ISBN | : |
Author | : Christopher Walz |
Publisher | : Springer |
Total Pages | : 169 |
Release | : 2015-12-24 |
Genre | : Science |
ISBN | : 3319271830 |
This work focuses on new electromagnetic decay mode in nuclear physics. The first part of the thesis presents the observation of the two-photon decay for a transition where the one-photon decay is allowed. In the second part, so called quadrupole mixed-symmetry is investigated in inelastic proton scattering experiments. In 1930 Nobel-prize winner M. Goeppert-Mayer was the first to discuss the two-photon decay of an exited state in her doctoral thesis. This process has been observed many times in atomic physics. However in nuclear physics data is sparse. Here this decay mode has only been observed for the special case of a transition between nuclear states with spin and parity quantum number 0+. For such a transition, the one-photon decay – the main experimental obstacle to observe the two-photon decay – is forbidden. Furthermore, the energy sharing and angular distributions were measured, allowing conclusions to be drawn about the multipoles contributing to the two-photon transition. Quadrupole mixed-symmetry states are an excitation mode in spherical nuclei which are sensitive to the strength of the quadrupole residual interaction. A new signature for these interesting states is presented which allows identification of mixed-symmetry states independently of electromagnetic transition strengths. Furthermore this signature represents a valuable additional observable to test model predictions for mixed-symmetry states.
Author | : |
Publisher | : |
Total Pages | : |
Release | : 1981 |
Genre | : |
ISBN | : |
A new experimental frontier has recently been opened to the study of two photon processes. The first results of many aspects of these reactions are being presented at this conference. In contrast, the theoretical development of research ito two photon processes has a much longer history. This talk reviews the many different theoretical ideas which provide a detailed framework for our understanding of two photon processes.
Author | : H. S. Akrongold |
Publisher | : SP Books |
Total Pages | : 121 |
Release | : 2007 |
Genre | : Grand unified theories (Nuclear physics) |
ISBN | : 1561712043 |
Author | : |
Publisher | : |
Total Pages | : 30 |
Release | : 1991 |
Genre | : |
ISBN | : |
Double-Pomeron processes have been shown to be an important and novel source of hadron production at moderate energies at the ISR. These processes are expected to provide glue-rich hadrons from 1 GeV to 10 GeV or more, encompassing the states consisting of u, d, s and b quarks. The double-pomeron cross sections for central hadroproduction are calculated for p x p and Au x Au at RHIC. Two-photon production of hadrons in the central region begins to dominate or at least become comparable to the double-Pomeron processes as the Z of the beams increases from p to Au. Since photons couple to charge, these hadroproductions involve mainly quarkonia and multiquark states. Therefore, a comparative study of these processes is expected to provide new insights into the constituents of hadronic matter. The two-photon processes are calculated following the recipe given by Cahn and Jackson. The paper starts out with a thorough discussion of the relevant kinematics, phase space and Regge amplitudes.
Author | : Bradley Cox |
Publisher | : Springer Science & Business Media |
Total Pages | : 548 |
Release | : 2012-12-06 |
Genre | : Science |
ISBN | : 1468488422 |
The Advanced Research Workshop on QeD Hard Hadronic Processes was held on 8-13 October 1987 at Hotel on the Cay, St. Croix, U. S. Virgin Islands. The underlying theme of the workshop, the first in a series, was an examination, both theoretical and experimental, of the state of understanding of Quantum Chromodynamics. Because of the pervasiveness of the strong interactions in all aspects of high energy physics, QCD is central to many problems in elementary particle physics. Therefore, this workshop was organized to provide a forum in which the theory Quantum Chromodynamics cou 1 d be confronted with experi ment. The workshop was organ i zed in four sessions, each of which concentrated on a major experimental arena in which a hard QCD process can be measured experimentally. A fifth session was rlevoted to global issues which effect all QCD processes. Each session began with a survey of the theoretical developments in the particular area and concluded with a round table which discussed the various information presented in the course of the discussions. A session of the workshop was devoted to the direct production of high transverse momentum photons in hadronic interactions. Data from several experiments, either completed or in progress at CERN (NA3, NA24, WA70, UA6, CCOR, R806, AFS, RllO, UA1 and UA2), were di scussed and the prospects for two new upcomi ng experi ments from Fermil ab (E-705, E-706) were presented.
Author | : Shih-i Chu |
Publisher | : World Scientific |
Total Pages | : 410 |
Release | : 1986-05-01 |
Genre | : |
ISBN | : 9814507954 |
This volume focuses on the recent rapid growth in both experimental and theoretical studies of multiphoton processes and multiphoton spectroscopy of atoms, ions and molecules in chemistry, physics, biology, material sciences, etc. It contains papers readable by active researchers and by those who intend to enter it. Theory and experiment are equally emphasized, and each review article is written in a self-contained manner by experts in the field so that readers learn the subject without much preparation.