scholarly journals Chiral unitary approach to the –deuteron scattering length

2001 ◽  
Vol 690 (4) ◽  
pp. 494-508 ◽  
Author(s):  
S.S. Kamalov ◽  
E. Oset ◽  
A. Ramos
Keyword(s):  
Scattering Length ◽  
Deuteron Scattering ◽  
Unitary Approach ◽  
Chiral Unitary Approach

Λ(1405) IN A BARYON-MESON SCATTERING DESCRIBED FROM A QUARK-MODEL VIEWPOINT

2010 ◽  
Vol 19 (12) ◽  
pp. 2459-2464
Author(s):  
Sachiko Takeuchi ◽  
Kiyotaka Shimizu
Keyword(s):  
Cluster Model ◽  
Scattering Length ◽  
Bound State ◽  
Quark State ◽  
Unitary Approach ◽  
Chiral Unitary Approach ◽  
Large Width ◽  
Coupled Channel ◽  
Meson System ◽  
The Continuum

Λ(1405) is investigated as a resonance in a coupled channel baryon-meson [Formula: see text] scattering with a 'bound state embedded in the continuum' (BSEC). This BSEC is introduced by hand, as a state not originated from a simple baryon-meson system. We assume it comes from the three-quark state. There appears a resonance of a large width in the Σπ scattering below the [Formula: see text] threshold by assuming the baryon meson interaction whose channel dependence is (1) flavor-flavor type like the chiral unitary approach, (2) flavor-flavor type with a lower-momentum cut-off, or (3) the same as that of the quark cluster model. It is necessary to introduce a BSEC for the latter two cases in order to reproduce the peak. The calculation including a BSEC seems to be preferable to reproduce the [Formula: see text] scattering length. Our calculation gives the observed value when the BSEC contribution to the resonance is roughly half of that of the [Formula: see text] channel.

Pion absorption and the pion-deuteron scattering length

1973 ◽  
Vol 45 (5) ◽  
pp. 437-440 ◽  
Author(s):  
A.W. Thomas ◽  
I.R. Afnan
Keyword(s):  
Scattering Length ◽  
Deuteron Scattering ◽  
Pion Absorption

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.

scholarly journals Role of scalar $$a_0(980)$$ in the single Cabibbo suppressed process $$D^+ \rightarrow \pi ^{+} \pi ^{0} \eta $$

2020 ◽  
Vol 80 (11) ◽  
Author(s):  
Man-Yu Duan ◽  
Jun-Ya Wang ◽  
Guan-Ying Wang ◽  
En Wang ◽  
De-Min Li
Keyword(s):  
Invariant Mass ◽  
Mass Distributions ◽  
Unitary Approach ◽  
Chiral Unitary Approach ◽  
Free Parameters ◽  
Cabibbo Suppressed ◽  
Dalitz Plots

AbstractTaking into account that the scalar $$a_0(980)$$ a 0 ( 980 ) can be dynamically generated from the pseudoscalar-pseudoscalar interaction within the chiral unitary approach, we have studied the single Cabibbo suppressed process $$D^+\rightarrow \pi ^+\pi ^0\eta $$ D + → π + π 0 η . We find clear peaks of $$a_0(980)^+$$ a 0 ( 980 ) + and $$a_0(980)^0$$ a 0 ( 980 ) 0 in the $$\pi ^+\eta $$ π + η and $$\pi ^0\eta $$ π 0 η invariant mass distributions, respectively. The predicted Dalitz plots of $$D^+\rightarrow \pi ^+\pi ^0\eta $$ D + → π + π 0 η also manifest the significant signals for $$a_0(980)^+$$ a 0 ( 980 ) + and $$a_0(980)^0$$ a 0 ( 980 ) 0 states. The uncertainties of the results due to the free parameters are also discussed. Our study shows that the process $$D^+\rightarrow \pi ^+\pi ^0\eta $$ D + → π + π 0 η can be used to explore the nature of the scalar $$a_0(980)$$ a 0 ( 980 ) , thus we encourage the experimental physicists to measure this reaction with more precision.

scholarly journals Dynamically generated 0+ heavy mesons in a heavy chiral unitary approach

2006 ◽  
Vol 641 (3-4) ◽  
pp. 278-285 ◽  
Author(s):  
Feng-Kun Guo ◽  
Peng-Nian Shen ◽  
Huan-Ching Chiang ◽  
Rong-Gang Ping ◽  
Bing-Song Zou
Keyword(s):  
Heavy Mesons ◽  
Unitary Approach ◽  
Chiral Unitary Approach

HADRONIC DECAYS OF η AND η′

2005 ◽  
Vol 20 (02n03) ◽  
pp. 546-548
Author(s):  
B. BORASOY ◽  
N. BEISERT
Keyword(s):  
Hadronic Decays ◽  
S Wave ◽  
Final State ◽  
Effective Lagrangian ◽  
Unitary Approach ◽  
Final State Interactions ◽  
Small Set ◽  
Chiral Unitary Approach ◽  
Spectral Shapes

The hadronic decays η→πππ, η′→πππ and η′→ηππ are investigated within a U(3) chiral unitary approach. Final state interactions are included by deriving the effective s wave potentials for meson meson scattering from the chiral effective Lagrangian and iterating them in a Bethe-Salpeter equation. With only a small set of parameters we are able to explain both rates and spectral shapes of these decays.

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