S11 RESONANCES IN A COUPLED-CHANNEL DYNAMICAL MODEL

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1656-1661 ◽  
Author(s):  
SHIN NAN YANG ◽  
GUAN-YEU CHEN ◽  
SABIT S. KAMALOV ◽  
L. TIATOR ◽  
D. DRECHSEL
Keyword(s):  
Pion Photoproduction ◽  
Dynamical Model ◽  
S Wave ◽  
Pion Scattering ◽  
A Value ◽  
Multipole Analysis ◽  
Coupled Channels ◽  
Self Consistent ◽  
The Masses ◽  
Coupled Channel

A self-consistent analysis of pion scattering and pion photoproduction within a coupled channels dynamical model is presented. The results indicate the existence of a third and a fourth S11 resonance with the masses 1846±47 and 2113±70 MeV . In the case of pion photoproduction, we found that background contributions to the imaginary part of the S-wave multipole become large and negative in the region of the S11(1535) resonance. Due to this fact, much larger resonance contributions are required in order to explain the results of the recent multipole analysis. For the first S11(1535) resonance we obtain a value of 72±2×10-3 GeV -1/2 for the electromagnetic helicity amplitude A1/2.

scholarly journals S-WAVE BOTTOM TETRAQUARKS

2010 ◽  
Vol 19 (11) ◽  
pp. 2181-2188 ◽  
Author(s):  
S. M. GERASYUTA ◽  
V. I. KOCHKIN
Keyword(s):  
Bottom Quarks ◽  
S Wave ◽  
The Masses ◽  
Coupled Channel ◽  
Meson States ◽  
Channel Formalism

The relativistic four-quark equations are found in the framework of coupled-channel formalism. The dynamical mixing of the meson–meson states with the four-quark states is considered. The four-quark amplitudes of the tetraquarks, including u, d, s, and bottom quarks, are constructed. The poles of these amplitudes determine the masses and widths of S-wave bottom tetraquarks.

RESONANCE DYNAMICS IN COUPLED CHANNELS

2014 ◽  
Vol 26 ◽  
pp. 1460054 ◽  
Author(s):  
MICHAEL DÖRING
Keyword(s):  
Partial Wave ◽  
Gauge Invariance ◽  
Pion Photoproduction ◽  
General Properties ◽  
Coupled Channels ◽  
Resonance Properties ◽  
S Matrix ◽  
Three Body ◽  
Coupled Channel

General properties of the S-matrix, such as constraints from two- and three-body unitarity as well as gauge invariance, are discussed and illustrated for the example of a dynamical coupled channel approach. The Jülich model has been updated to analyze πN, ηN, and KY production as well as pion photoproduction. Partial wave amplitudes and resonance properties are determined.

scholarly journals COUPLED CHANNEL EFFECTS IN ππ S-WAVE INTERACTION

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1905-1909 ◽  
Author(s):  
F. Q. WU ◽  
B. S. ZOU
Keyword(s):  
Wave Scattering ◽  
Wave Interaction ◽  
Matrix Formalism ◽  
S Wave ◽  
Coupled Channels ◽  
Channel Effects ◽  
Scattering Phase ◽  
Scattering Phase Shifts ◽  
Coupled Channel ◽  
K Matrix

We study coupled channel effects upon isospin I=2 and I=0 ππ S-wave interaction. With introduction of the ππ→ρρ→ππ coupled channel box diagram contribution into ππ amplitude in addition to ρ and f2(1270) exchange, we reproduce the ππ I =2 S-wave and D-wave scattering phase shifts and inelasticities up to 2 GeV quite well in a K-matrix formalism. For I=0 case, the same ππ→ρρ→ππ box diagram is found to give the largest contribution for the inelasticity among all possible coupled channels including ππ→ωω→ππ, [Formula: see text]. We also show why the broad σ appears narrower in production processes than in ππ scattering process.

scholarly journals A STUDY OF THE πN SCATTERING DATA WITH JP = 3/2- AND A PROOF OF THE EXISTENCE OF THE N*(1700)

2014 ◽  
Vol 26 ◽  
pp. 1460061
Author(s):  
E. J. GARZON ◽  
JUJUN XIE ◽  
E. OSET
Keyword(s):  
Experimental Data ◽  
Complex Plane ◽  
Scattering Data ◽  
S Wave ◽  
Wave Data ◽  
Coupled Channels ◽  
Free Parameters ◽  
Coupled Channel ◽  
D Wave

Using an interaction extracted from the local hidden gauge Lagrangians and the coupled channels ρN (s-wave), πN (d-wave), πΔ (s-wave) and πΔ (d-wave), we look in the region of [Formula: see text] and we find two resonances dynamically generated which are naturally associated to the N*(1520)(3/2-) and N*(1700)(3/2-). The N*(1700)(3/2-) appears neatly as a pole in the complex plane. The free parameters of the theory are chosen to fit the πN (d-wave) data. The unitary coupled channel approach followed here, in connection with the experimental data, leads automatically to a pole in the 1700 MeV region and makes this second 3/2- resonance unavoidable.

scholarly journals MULTIPOLE ANALYSIS FOR PION PHOTOPRODUCTION WITH MAID AND A DYNAMICAL MODEL

NSTAR 2001 ◽  
2001 ◽  
pp. 197-202
Author(s):  
S. S. KAMALOV ◽  
D. DRECHSEL ◽  
L. TIATOR ◽  
S. N. YANG
Keyword(s):  
Pion Photoproduction ◽  
Dynamical Model ◽  
Multipole Analysis

scholarly journals Effect of coupled channels of the multi-channel pion-pion scattering in two-pion transitions of the Υ mesons

2015 ◽  
Vol 39 ◽  
pp. 1560090
Author(s):  
Yurii S. Surovtsev ◽  
Petr Bydžovský ◽  
Thomas Gutsche ◽  
Robert Kamiński ◽  
Valery E. Lyubovitskij ◽  
...  
Keyword(s):  
Scattering Amplitudes ◽  
Mass Spectra ◽  
Final States ◽  
S Wave ◽  
Wave Processes ◽  
Crystal Ball ◽  
Combined Analysis ◽  
Pion Scattering ◽  
Scalar Mesons ◽  
Coupled Channels

The effect of isoscalar S-wave processes [Formula: see text] is considered in the analysis of data (from the ARGUS, CLEO, CUSB, Crystal Ball, Belle, BABAR collaborations) on the bottomonia decays — [Formula: see text] ([Formula: see text]). It is shown that the dipion mass spectra of these decays are explained by the unified mechanism related to the contribution of the multichannel [Formula: see text] scattering in the final states of these reactions. Since in the analysis the multichannel [Formula: see text]-scattering amplitudes did not change in comparison with the ones in our combined analysis of data on the multichannel [Formula: see text] scattering and on the charmonia decays — [Formula: see text] and [Formula: see text] (from the Crystal Ball, DM2, Mark II, Mark III, and BES II) — the results confirm all our earlier conclusions on the scalar mesons.

CHARM MESONS AT FAIR

2008 ◽  
Vol 23 (27n30) ◽  
pp. 2250-2253
Author(s):  
LAURA TOLÓS ◽  
ANGELS RAMOS ◽  
TETSURO MIZUTANI
Keyword(s):  
D Meson ◽  
Mean Field ◽  
Dense Matter ◽  
S Wave ◽  
Charm Mesons ◽  
Medium Effects ◽  
Pauli Blocking ◽  
Self Consistent ◽  
Low Energy Tail ◽  
Coupled Channel

The in-medium properties of charm mesons (D and [Formula: see text]) in a hot and dense matter are studied. A self-consistent coupled-channel approach is driven by a broken SU(4) s-wave Tomozawa-Weinberg interaction supplemented by an attractive isoscalar-scalar term. As medium effects, we include Pauli blocking, baryon mean-field bindings, and π and open-charm meson self-energies. The dynamically generated [Formula: see text] and [Formula: see text] resonances in the DN sector remain close to their free space position but acquire large widths. The resultant D meson spectral function, which shows a single pronounced quasiparticle peak close to the free mass that broadens with increasing density, also has a long low energy tail associated with smeared [Formula: see text], [Formula: see text] configurations. The low-density approximation for the [Formula: see text] is questionable already at subsaturation densities. We touch upon the implication of our study for J/Ψ suppression at FAIR.

scholarly journals S-WAVE BOTTOM BARYONS

2009 ◽  
Vol 18 (08) ◽  
pp. 1785-1799 ◽  
Author(s):  
S. M. GERASYUTA ◽  
E. E. MATSKEVICH
Keyword(s):  
Dispersion Relation ◽  
Approximate Solutions ◽  
S Wave ◽  
Calculated Mass ◽  
The Masses ◽  
Coupled Channel ◽  
Channel Formalism ◽  
Good Agreement

The masses of S-wave bottom baryons are calculated in the framework of coupled-channel formalism. The relativistic three-quark equations for the bottom baryons using the dispersion relation technique are found. The approximate solutions of these equations based on the extraction of leading singularities of the amplitude are obtained. The calculated mass values of S-wave bottom baryons are in good agreement with the experimental ones.

BOOTSTRAPPING A HEAVY HIGGS

1988 ◽  
Vol 03 (03) ◽  
pp. 295-301 ◽  
Author(s):  
A.P. CONTOGOURIS ◽  
N. MEBARKI ◽  
D. ATWOOD ◽  
H. TANAKA
Keyword(s):  
Simple Model ◽  
Strong Interaction ◽  
Higgs Mass ◽  
Bound State ◽  
Interaction Effects ◽  
Phase Shifts ◽  
Dispersion Relations ◽  
S Wave ◽  
Self Consistent ◽  
Consistent Solution

Possible strong interaction effects arising when the Higgs mass MH is sufficiently large are investigated in the system of interacting Higgs, using dispersion relations (N/D method). A simple model indicates that for MH≳1 TeV several such effects are present: an 1=0 bound state, large s-wave phase shifts and a resonance-like state. In the range 1.5≲MH≲3.5 TeV the above bound state amounts to an approximate bootstrap (self-consistent) solution for the Higgs with respect to both its mass and coupling. Other aspects of the H-H strong interaction system are also investigated.

S-wave kaon-pion scattering

1966 ◽  
Vol 41 (1) ◽  
pp. 48-66
Author(s):  
M. Huq
Keyword(s):  
S Wave ◽  
Pion Scattering
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