scholarly journals Neutral meson photoproduction inSUf(3)chiral perturbation theory:γN→π0N

1996 ◽  
Vol 54 (1) ◽  
pp. 1182-1186 ◽  
Author(s):  
M. K. Banerjee ◽  
J. Milana
Keyword(s):  
Neutral Meson ◽  
Meson Photoproduction ◽  
Chiral Perturbation

scholarly journals Non-strange dibaryons studied in coherent double neutral-meson photoproduction on the deuteron

2020 ◽  
Vol 241 ◽  
pp. 01007
Author(s):  
Takatsugu Ishikawa ◽  
Hisako Fujimura ◽  
Hiroshi Fukasawa ◽  
Ryo Hashimoto ◽  
Qinghua He ◽  
...  
Keyword(s):  
Invariant Mass Distribution ◽  
Center Of Mass ◽  
Resonance State ◽  
Angular Distributions ◽  
Neutral Meson ◽  
Mass Energy ◽  
Meson Photoproduction ◽  
Neutral Pions ◽  
Center Of Mass Energy ◽  
Interesting Object

The B = 2 bound/resonance state (dibaryon) is an interesting object, which can be a molecule consisting of two baryons or a spatially compact hexaquark hadron object. The yd ^ n°n°d reaction has been experimentally investigated at incident energies ranging from 0.58 to 1.15 GeV to study non-strange dibaryons. The angular distributions of deuteron emission in the yd center-of-mass energy cannot be reproduced by quasi-free production of two neutral pions followed by deuteron coalescence. Additionally a 2.14-GeV peak is observed in the n°d invariant mass distribution. These suggest a sequential process such as yd ^ RIS ^ n°RIV ^ n°n°d with an isoscalar dibaryon RIS and an isovector dibaryon RIV. Since the mass of the observed isoscalar dibaryons are close to the sum of the nucleon (N) and nucleon resonance (N*) masses, an S-wave NN* molecule may play a role as a doorway to a dibaryon.

Neutral Meson Photoproduction from Complex Nuclei

1962 ◽  
Vol 127 (5) ◽  
pp. 1772-1783 ◽  
Author(s):  
R. A. Schrack ◽  
J. E. Leiss ◽  
S. Penner
Keyword(s):  
Neutral Meson ◽  
Meson Photoproduction ◽  
Complex Nuclei

scholarly journals Non-strange Dibaryons Studied in Coherent Double Neutral-meson Photoproduction on the Deuteron

2020 ◽  
Vol 51 (1) ◽  
pp. 329 ◽  
Author(s):  
T. Ishikawa ◽  
H. Fujimura ◽  
H. Fukasawa ◽  
R. Hashimoto ◽  
Q. He ◽  
...  
Keyword(s):  
Neutral Meson ◽  
Meson Photoproduction

MEASUREMENT OF THE DOUBLE POLARIZATION OBSERVABLE E IN π0 AND η PHOTOPRODUCTION OFF PROTONS WITH THE CBELSA/TAPS EXPERIMENT

2014 ◽  
Vol 26 ◽  
pp. 1460112
Author(s):  
◽  
M. GOTTSCHALL ◽  
J. MÜLLER
Keyword(s):  
Partial Wave ◽  
Electron Accelerator ◽  
Neutral Pion ◽  
State Of The Art ◽  
Polarization Observable ◽  
Photon Beam ◽  
Neutral Meson ◽  
Meson Photoproduction ◽  
Circularly Polarized ◽  
Double Polarization

Double polarization experiments using a longitudinally or transversely polarized frozen-spin-butanol target and a linearly or circularly polarized photon beam were performed with the CBELSA/TAPS experiment at the electron accelerator ELSA. With its nearly 4π angular coverage, this setup is very well suited to study neutral meson photoproduction off the nucleon up to beam energies of 3.2 GeV. Results obtained for the double polarization observable E in neutral pion and eta photoproduction show the large sensitivity of the data on the contributing resonances. If the data are compared to the predictions of state of the art partial wave analyses, large discrepancies are observed.

Neutral-meson photoproduction and related vector-meson production

1972 ◽  
Vol 4 (11) ◽  
pp. 475-482 ◽  
Author(s):  
J. L. Alonso ◽  
L. Gislen ◽  
J. Tran Thanh Van
Keyword(s):  
Vector Meson ◽  
Meson Production ◽  
Neutral Meson ◽  
Meson Photoproduction ◽  
Vector Meson Production

scholarly journals The axion-baryon coupling in SU(3) heavy baryon chiral perturbation theory

2021 ◽  
Vol 2021 (8) ◽  
Author(s):  
Thomas Vonk ◽  
Feng-Kun Guo ◽  
Ulf-G. Meißner
Keyword(s):  
Perturbation Theory ◽  
Chiral Perturbation Theory ◽  
Heavy Baryon ◽  
Power Counting ◽  
Flavor Symmetry ◽  
Chiral Perturbation ◽  
Third Order ◽  
Stellar Objects ◽  
The Past ◽  
Dense Nuclear Matter

Abstract In the past, the axion-nucleon coupling has been calculated in the framework of SU(2) heavy baryon chiral perturbation theory up to third order in the chiral power counting. Here, we extend these earlier studies to the case of heavy baryon chiral perturbation theory with SU(3) flavor symmetry and derive the axion coupling to the full SU(3) baryon octet, showing that the axion also significantly couples to hyperons. As studies on dense nuclear matter suggest the possible existence of hyperons in stellar objects such as neutron stars, our results should have phenomenological implications related to the so-called axion window.

Light front Hamiltonian for boson form of QED (1 + 1) in Pauli–Villars regularization

2019 ◽  
Vol 34 (21) ◽  
pp. 1950113
Author(s):  
V. A. Franke ◽  
M. Yu. Malyshev ◽  
S. A. Paston ◽  
E. V. Prokhvatilov ◽  
M. I. Vyazovsky
Keyword(s):  
Perturbation Theory ◽  
Chiral Perturbation Theory ◽  
Chiral Condensate ◽  
Light Front ◽  
Coupling Constants ◽  
Hamiltonian Approach ◽  
Chiral Perturbation ◽  
Dimensional Models ◽  
Villars Regularization ◽  
Ultraviolet Regularization

Light front (LF) Hamiltonian for QED in [Formula: see text] dimensions is constructed using the boson form of this model with additional Pauli–Villars-type ultraviolet regularization. Perturbation theory, generated by this LF Hamiltonian, is proved to be equivalent to usual covariant chiral perturbation theory. The obtained LF Hamiltonian depends explicitly on chiral condensate parameters which enter in a form of some renormalization of coupling constants. The obtained results can be useful when one attempts to apply LF Hamiltonian approach for [Formula: see text]-dimensional models like QCD.

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