scholarly journals η-meson production in nucleon-nucleon collisions within an effective Lagrangian model

2007 ◽  
Vol 75 (5) ◽  
Author(s):  
R. Shyam
Keyword(s):  
Meson Production ◽  
Nucleon Nucleon ◽  
Lagrangian Model ◽  
Effective Lagrangian

scholarly journals OPEN AND HIDDEN STRANGENESS PRODUCTION IN NUCLEON-NUCLEON COLLISIONS

2009 ◽  
Vol 18 (05n06) ◽  
pp. 1359-1370
Author(s):  
RADHEY SHYAM
Keyword(s):  
Meson Production ◽  
Nucleon Nucleon ◽  
Lagrangian Model ◽  
Proper Understanding ◽  
K Meson ◽  
Strange Meson ◽  
Effective Lagrangian ◽  
Resonant States ◽  
Perturbative Regime ◽  
Excitation Propagation

Strange meson production reactions are expected to provide information on the manifestation of quantum chromodynamics in the non-perturbative regime of energies larger than that of the low energy pion physics. The K meson contains a strange quark (s) or antiquark [Formula: see text] while the η meson has hidden strangeness as it contains some component of the [Formula: see text] pair. In this lecture we present an overview of describing the production of K and η mesons in nucleon-nucleon collisions within an effective Lagrangian model (ELM) where meson production proceeds via excitation, propagation and subsequent decay of intermediate baryonic resonant states. Specific examples are discussed where proper understanding of the data is still lacking.

The Analysis ofπ-Meson Production in Nucleon-Nucleon Collisions

1951 ◽  
Vol 83 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Kenneth M. Watson ◽  
Keith A. Brueckner
Keyword(s):  
Meson Production ◽  
Nucleon Nucleon

scholarly journals Role of N*(1535) in the Λ+c → K0ηp decay and the possible фp state in the Λ+c → π0фp decay

2020 ◽  
Vol 241 ◽  
pp. 02010
Author(s):  
Ju-Jun Xie ◽  
Li-Sheng Geng ◽  
Feng-Kun Guo
Keyword(s):  
Invariant Mass ◽  
Mass Distribution ◽  
Final State Interaction ◽  
Invariant Mass Distribution ◽  
Lagrangian Model ◽  
Final State ◽  
Peak Structure ◽  
Effective Lagrangian ◽  
Unitary Approach ◽  
Chiral Unitary Approach

The nonleptonic weak decays of Λ+c → K0ηp and Λ+c → π0фp are investigated from the viewpoint of probing the N*(1535) resonance and the possible фp state. For the Λ+c → K0ηp decay, we study the invariant mass distribution of ηp with both the chiral unitary approach and an effective Lagrangian model. Within the chiral unitary approach, the N*(1535) resonance is dynamically generated from the final state interaction of mesons and baryons in coupled channels. While for the effective Lagrangian model, we take a Breit-Wigner formula for the N*(1535) resonance. We found that the behavior of the N*(1535) resonance in the Λ+c → K0N*(1535) → K0ηp decay within the two approaches is different. For the Λ+c → π0фp decay, we consider a triangle singularity mechanism, where the Λ+c decays into the K*Σ*(1385), the Σ*(1385) decays into the π0Σ/Λ, and then the K*Σ/Λ merge to produce the фp in the final state. This mechanism produces a peak structure around 2020 MeV. In addition, the possibility that there is a hidden-strange pentaquark-like state is also considered by taking into account the final state interactions of K*Λ, K*Σ, and фp. We conclude that it is difficult to search for the hidden-strange state in this decay. However, we do expect nontrivial behavior in the фp invariant mass distribution. The proposed Λ+c decay mechanism here can provide valuable information on the properties of these nuclear resonances and can in principle be tested by experiments such as BESIII, LHCb and Belle-II.

Baryonic Interactions in an Effective-Lagrangian Model

1972 ◽  
Vol 6 (5) ◽  
pp. 1453-1455
Author(s):  
Ashok Kumar Bhargava
Keyword(s):  
Lagrangian Model ◽  
Effective Lagrangian

scholarly journals THE EFFECT OF ELECTROMAGNETIC PROPERTIES OF NEUTRINOS ON THE PHOTON–NEUTRINO DECOUPLING TEMPERATURE

2012 ◽  
Vol 27 (32) ◽  
pp. 1250187
Author(s):  
S. C. İNAN ◽  
M. KÖKSAL
Keyword(s):  
Lagrangian Model ◽  
Electromagnetic Properties ◽  
Beyond The Standard Model ◽  
Ultrahigh Energy ◽  
Qcd Phase Transition ◽  
Effective Lagrangian ◽  
Independent Analysis ◽  
The Standard Model ◽  
Model Independent ◽  
The Impact

We examine the impact of electromagnetic properties of neutrinos on the annihilation of relic neutrinos with ultrahigh energy cosmic neutrinos for the [Formula: see text] process. For this process, photon–neutrino decoupling temperature is calculated via effective Lagrangian model beyond the standard model. We find that photon–neutrino decoupling temperature can be importantly reduced below the QCD phase transition with the model independent analysis defining electromagnetic properties of neutrinos.

On a phenomenological approach to meson production in nucleon-nucleon collisions

1951 ◽  
Vol 210 (1100) ◽  
pp. 85-98 ◽  
Keyword(s):  
Meson Production ◽  
Phenomenological Approach ◽  
Nucleon Nucleon ◽  
Neutral Meson ◽  
No Production ◽  
Distorted Wave ◽  
Proton Proton ◽  
Neutral Mesons ◽  
Valid Comparison ◽  
Charged Mesons

The validity of certain phenomenological approaches to spin zero meson production in nucleon-nucleon collisions is considered. It is shown that, to first-order perturbation theory, a method analogous to the distorted wave approximation is valid. Comparison is made with a bremsstrahlung-like calculation which, for neutral mesons with non-derivative coupling to the spinor field, gives no production, since the nucleon recoil is neglected. Application of the distorted wave approach to neutral meson production in proton-neutron collisions, and comparison with the results for production of charged mesons in proton-proton collisions is sketched. Results are quoted for simple inverse processes.

IMPROVED BOUNDS ON THE TAU MAGNETIC MOMENTS

2001 ◽  
Vol 16 (supp01b) ◽  
pp. 545-547 ◽  
Author(s):  
GABRIEL A. GONZÁLEZ-SPRINBERG ◽  
ARCADI SANTAMARIA ◽  
JORGE VIDAL
Keyword(s):  
Standard Model Prediction ◽  
Magnetic Moments ◽  
W Bosons ◽  
Lagrangian Model ◽  
Tau Leptons ◽  
Effective Lagrangian ◽  
Order Of Magnitude ◽  
Magnetic Couplings ◽  
Using Data ◽  
First Time

New limits on the tau magnetic couplings to the photon, the Z and the W bosons are obtained from the most general effective Lagrangian. Model independent bounds are set using data for tau pair production and W decay into tau leptons at LEP1, LEP2, SLD and hadron colliders. For the anomalous magnetic moment the bounds are, for the first time, of the order of magnitude of the standard model prediction.

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