scholarly journals Antiproton-proton annihilation into light neutral meson pairs within an effective meson theory

2017 ◽  
Vol 96 (2) ◽  
Author(s):  
Ying Wang ◽  
Yury M. Bystritskiy ◽  
Azad I. Ahmadov ◽  
Egle Tomasi-Gustafsson
Keyword(s):  
Neutral Meson ◽  
Meson Theory

On the scattering of fast neutrons by protons

1946 ◽  
Vol 42 (1) ◽  
pp. 45-54 ◽  
Author(s):  
A. Pais
Keyword(s):  
Angular Distribution ◽  
Total Cross Section ◽  
Cross Section ◽  
Neutral Theory ◽  
High Energy ◽  
Fast Neutrons ◽  
Neutral Meson ◽  
Meson Theory ◽  
Charge Dependence ◽  
Symmetrical Type

1. Introduction. Recent experiments by Amaldi and his collaborators on the scattering of high-energy neutrons (of 10–15 MeV.) by protons(2) have disclosed a considerable anisotropy in the angular distribution of the scattered particles. Theoretical discussions of this problem show an interesting feature in that the results depend sensitively on the basic assumptions involved with regard to the charge dependence of the neutron-proton interaction. This can be seen in particular from calculations by Rarita and Schwinger(3) and by Ferretti(4). The former authors started from the assumption of a distance dependence of this interaction represented by a square well, while the angular and spin dependence included terms of the axial dipole type. If the charge dependence was further assumed to be of the ‘symmetrical’ type, they found a value for the anisotropy in strong disagreement with experiment, whereas the total cross-section agreed with the measured value; a ‘neutral’ theory, on the other hand, yielded agreement as regards anisotropy, but a total cross-section too large by a factor of the order of 1·5. Ferretti investigated the scattering on Bethe's neutral meson theory(5) and found satisfactory agreement with regard to both angular distribution and total cross-section. It should be stressed that all calculations mentioned were performed in the approximation in which only the contributions of the S- and P-waves are considered.

The interaction of point particles with charged fields

1949 ◽  
Vol 45 (3) ◽  
pp. 429-440 ◽  
Author(s):  
K. J. Le Couteur
Keyword(s):  
Classical Theory ◽  
Quantum Mechanical ◽  
Neutral Meson ◽  
Rest Energy ◽  
Point Particles ◽  
Neutral Mesons ◽  
Meson Theory ◽  
Quantum Mechanical Effects ◽  
Charged Mesons ◽  
A Charge

1. The method introduced by Dirac (1) in his classical theory of the interaction of an electron with an electromagnetic field has since been extended to the interaction of point particles with more general wave fields, such as occur in the neutral meson theory. Bhabha (2, 3) considered the scattering of neutral mesons by nucleons and gave arguments to show that typically quantum-mechanical effects should be unimportant if the energy of the incident meson is less than the rest energy of a nucleon, so that a classical theory with damping is appropriate to such problems. Now only the charged mesons are observable, and therefore a discussion of the classical theory of the interaction of a nucleon with a charge-bearing field is desirable. Apart from a paper by Fierz (4) which omits the dipole-like coupling terms, there is little published work on this subject.

Neutral-Meson production in a quark model

1968 ◽  
Vol 55 (4) ◽  
pp. 671-678 ◽  
Author(s):  
G. C. Joshi
Keyword(s):  
Quark Model ◽  
Meson Production ◽  
Neutral Meson

scholarly journals New limits on tanβ for 2HDMs with Z2 symmetry

2015 ◽  
Vol 30 (26) ◽  
pp. 1550158 ◽  
Author(s):  
Dipankar Das
Keyword(s):  
Lower Limit ◽  
Scalar Potential ◽  
Higgs Doublet ◽  
Exact Formula ◽  
Meson Mass ◽  
Neutral Meson ◽  
Breaking Parameter ◽  
Two Higgs Doublet Models ◽  
Breaking Term

In two-Higgs-doublet models with exact [Formula: see text] symmetry, putting [Formula: see text] at the alignment limit, the following limits on the heavy scalar masses are obtained from the conditions of unitarity and stability of the scalar potential: [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text]. The constraints from [Formula: see text] and neutral meson mass differences, when superimposed on the unitarity constraints, put a tighter lower limit on [Formula: see text] depending on [Formula: see text]. It has also been shown that larger values of [Formula: see text] can be allowed by introducing soft breaking term in the potential at the expense of a correlation between [Formula: see text] and the soft breaking parameter.

Photon and neutral meson data from the collision of 200 A · GeV sulphur ions with gold targets

1993 ◽  
Vol 30 ◽  
pp. 353-362
Author(s):  
R. Santo ◽  
R. Albrecht ◽  
T.C. Awes ◽  
P. Beckmann ◽  
F. Berger ◽  
...  
Keyword(s):  
Neutral Meson
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