20 research outputs found
The reaction at threshold in chiral perturbation theory
In the framework of heavy baryon chiral perturbation theory, we give thIn the
framework of heavy baryon chiral perturbation theory, we give the chiral
expansion for the threshold amplitudes and to
quadratic order in the pion mass. The theoretical results agree within one
standard deviation with the empirical values. We also derive a relation between
the two threshold amplitudes of the reaction and the S--wave scattering lengths, and , respectively, to order
. We show that there are uncertainties mostly related to
resonance excitation which make an accurate determination of the
scattering length from the threshold amplitudes at present
very difficult. The situation is different in the isospin two final
state. Here, the chiral series converges and one finds consistent with the one--loop chiral perturbation theory prediction.Comment: 30 pp, LaTeX file, uses epsf, 6 figures (appended), corrections in
sections 5 and 6, conclusions unchange
Title Quantum Optics and Heavy Ion Physics
I shall try to say a few words about two particular ways in which my own work
has a certain relation to your work with heavy ions. My title is therefore
"Quantum Optics and Heavy Ion Physics".Comment: Invited paper delivered at Quark Matter 2005 Conference, Budapest,
Hungary, August 4, 2005, 11 pages, 5 figure
Multiphoton Quantum Optics and Quantum State Engineering
We present a review of theoretical and experimental aspects of multiphoton
quantum optics. Multiphoton processes occur and are important for many aspects
of matter-radiation interactions that include the efficient ionization of atoms
and molecules, and, more generally, atomic transition mechanisms;
system-environment couplings and dissipative quantum dynamics; laser physics,
optical parametric processes, and interferometry. A single review cannot
account for all aspects of such an enormously vast subject. Here we choose to
concentrate our attention on parametric processes in nonlinear media, with
special emphasis on the engineering of nonclassical states of photons and
atoms. We present a detailed analysis of the methods and techniques for the
production of genuinely quantum multiphoton processes in nonlinear media, and
the corresponding models of multiphoton effective interactions. We review
existing proposals for the classification, engineering, and manipulation of
nonclassical states, including Fock states, macroscopic superposition states,
and multiphoton generalized coherent states. We introduce and discuss the
structure of canonical multiphoton quantum optics and the associated one- and
two-mode canonical multiphoton squeezed states. This framework provides a
consistent multiphoton generalization of two-photon quantum optics and a
consistent Hamiltonian description of multiphoton processes associated to
higher-order nonlinearities. Finally, we discuss very recent advances that by
combining linear and nonlinear optical devices allow to realize multiphoton
entangled states of the electromnagnetic field, that are relevant for
applications to efficient quantum computation, quantum teleportation, and
related problems in quantum communication and information.Comment: 198 pages, 36 eps figure
Recommended from our members
A proposal to measure polarization in pp, pi- p and pi+ p elastic scattering at 50, 100, and 150 GeV/c at the National Accelerator Laboratory
The authors propose to measure the polarization parameter in pp, {pi}{sup -}p, and {pi}{sup +}p scattering at incident momenta of 50, 100, and 150 GeV/c over the range 0.15 {le} -t {le} 1.5 (GeV/c){sup 2}. The apparatus consists of a polarized proton target, two spectrometer arms which determine the angles and momenta of both outgoing particles, and an on-line computer. The detectors are designed to operate at incident beam rates of up to 10{sup 8} beam particles/pulse. They anticipate an error in the polarization parameter P of .005 {le} {Delta}P {le} .01 over the range .15 {le} -t {le} .8 (GeV/c){sup 2} in 100 shifts of data taking and background studies
Pion--nucleon interaction and mesonic atoms. Progress report, February 1, 1977--January 31, 1978. [Summary of reseach activities at Wyoming Univ. , Laramie]
Experimental research in high energy physics and mesic atoms is summarized. A list of publications is included. (JFP