scholarly journals Electroexcitation of the Roper resonance in relativistic quark models

2007 ◽  
Vol 76 (2) ◽  
Author(s):  
I. G. Aznauryan
Keyword(s):  
Roper Resonance ◽  
Quark Models

The exclusive reaction of pion quasi-elastic knockout from nucleon p(e, e′ π)B to various states of the final baryon-spectator B and the quark models for the pion cloud of nucleon

Open Physics ◽  
2004 ◽  
Vol 2 (3) ◽  
Author(s):  
Vladimir Neudatchin ◽  
Igor Obukhovsky ◽  
Ludmila Sviridova ◽  
Nikolai Yudin
Keyword(s):  
Experimental Investigation ◽  
Goldstone Boson ◽  
Microscopic Model ◽  
Pion Cloud ◽  
Roper Resonance ◽  
Pion Momentum ◽  
Momentum Distributions ◽  
Quark Models ◽  
Virtual Decay ◽  
Q System

AbstractThe pion momentum distributions (MDs) in four channels of virtual decay p→B+π, B = N, Δ, N 1/2-(1535), N 1/2+(1440) are calculated in two models, the microscopic model of 3 P 0 scalar q−q fluctuation with the pion as a composite q−q-system and the chiral semi-microscopic model of πq interaction with the pion as a structureless Goldstone boson. The results of the above models are similar for the baryon states B = N, Δ, N 1/2-(1535) but are rather different for the Roper resonance N 1/2+(1440) which corresponds to excitation of two oscillator quanta in the nucleon. The experimental investigation of pion MDs by means of the reaction of quasi-elastic knockout of pion by an electron of a few GeV energy p(e, e′ π)B may be very suitable for Jefferson Laboratory, Virginia (JLab).

scholarly journals HYBRID AND CONVENTIONAL BARYONS IN THE FLUX-TUBE AND QUARK MODELS

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1791-1796 ◽  
Author(s):  
PHILIP R. PAGE
Keyword(s):  
Flux Tube ◽  
Model Prediction ◽  
Production Data ◽  
Tube Model ◽  
Roper Resonance ◽  
Flux Tubes ◽  
Baryon Decay ◽  
The Status ◽  
Quark Models

The status of conventional baryon flux-tubes and hybrid baryons is reviewed. Recent surprises are that a model prediction indicates that hybrid baryons are very weakly produced in glue-rich Ψ decays, and an analysis of electro-production data concludes that the Roper resonance is not a hybrid baryon. The baryon decay flux-tube overlap has been calculated in the flux-tube model, and is discussed here. The behavior of the overlap follows naïve expectations.

SOME THEORETICAL ISSUES OF HADRON PRODUCTIONS AND PROPERTIES FROM J/ψ DECAYS

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1712-1719
Author(s):  
P. N. SHEN ◽  
H. C. CHIANG ◽  
B. S. ZOU ◽  
W. H. LIANG ◽  
R. G. PING ◽  
...  
Keyword(s):  
Angular Distribution ◽  
Strong Interaction ◽  
Branching Ratio ◽  
Radiative Decays ◽  
Strong Decay ◽  
Roper Resonance ◽  
Background Contribution ◽  
Hadronic Structure ◽  
Quark Models ◽  
Theoretical Issues

J/ψ strong decay is one of the best places to study the hadronic structure and the strong interaction. In this talk, as the background contribution, the proton pole diagram contribution to the branching ratio and the angular distribution in [Formula: see text] decays is analyzed. The applicability of quark models is explored via [Formula: see text] process. The structures of N* s , especially Roper resonance, are discussed by studying J/ψ decays. The productions of possible multi-quark systems via charmonium and bottomonium strong/radiative decays are also investigated.

scholarly journals NUCLEON RESONANCES AND GPDS IN AdS/QCD

2014 ◽  
Vol 26 ◽  
pp. 1460066 ◽  
Author(s):  
ALFREDO VEGA ◽  
IVAN SCHMIDT ◽  
THOMAS GUTSCHE ◽  
VALERY E. LYUBOVITSKIJ
Keyword(s):  
Roper Resonance ◽  
Wall Model ◽  
Nucleon Resonances ◽  
Soft Wall Model ◽  
Nucleon Spectrum ◽  
Soft Wall

We discuss an holographic soft wall model to describe nucleon properties. We pay special attention to nucleon spectrum, GPDs in the skewness case for nucleons and electroproduction of the N (1440) Roper resonance in soft-wall AdS/QCD.

Phase diagram of non-local chiral quark models under compact star conditions

2007 ◽  
Author(s):  
D. Gómez Dumm ◽  
A. G. Grunfeld ◽  
N. N. Scoccola
Keyword(s):  
Phase Diagram ◽  
Compact Star ◽  
Non Local ◽  
Quark Models

Simple relativistic quark models

2020 ◽  
Author(s):  
Sirajudheen Kuthini Kunhammed
Keyword(s):  
Quark Models

scholarly journals PRODUCTION OF TWO PIONS INDUCED BY NEUTRINOS

2008 ◽  
Vol 23 (27n30) ◽  
pp. 2309-2312 ◽  
Author(s):  
M. VALVERDE ◽  
J. NIEVES ◽  
E. HERNÁNDEZ ◽  
S. K. SINGH ◽  
M. J. VICENTE VACAS
Keyword(s):  
Roper Resonance ◽  
Nucleon Pole ◽  
Chiral Lagrangian

We study the threshold production of two pions induced by neutrinos in nucleon targets. The contribution of nucleon pole, pion and contact terms is calculated using a chiral Lagrangian. The contribution of the Roper resonance, neglected in earlier studies, has also been taken into account.

scholarly journals Nonperturbative partonic quasidistributions of the pion from chiral quark models

2017 ◽  
Vol 773 ◽  
pp. 385-390 ◽  
Author(s):  
Wojciech Broniowski ◽  
Enrique Ruiz Arriola
Keyword(s):  
Quark Models
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