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 Pion momentum distributions in the nucleon in chiral effective theory

2013 ◽  
Vol 87 (5) ◽  
Author(s):  
M. Burkardt ◽  
K. S. Hendricks ◽  
Chueng-Ryong Ji ◽  
W. Melnitchouk ◽  
A. W. Thomas
Keyword(s):  
Effective Theory ◽  
Pion Momentum ◽  
Momentum Distributions

DIBARYONS WITH STRANGENESS IN QUARK MODELS

2010 ◽  
Vol 25 (19) ◽  
pp. 1603-1612 ◽  
Author(s):  
MEI CHEN ◽  
FANG GONG ◽  
HONGXIA HUANG ◽  
JIALUN PING
Keyword(s):  
Goldstone Boson ◽  
Binding Energies ◽  
Chiral Quark Model ◽  
Present Calculation ◽  
Goldstone Bosons ◽  
Screening Model ◽  
Dynamical Calculation ◽  
Boson Exchange ◽  
Narrow Width ◽  
Quark Models

The extended quark delocalization color screening model, which incorporates Goldstone–boson-exchange with soft cutoff, and chiral quark model are employed to do a systematic dynamical calculation of six-quark systems with strangeness. The two models give similar results, although they have different attraction mechanisms. Comparing with the previous calculation of the extended quark delocalization color screening model, in which the Goldstone–bosons are introduced with hard cutoff, the present calculation obtains a little large binding energies for most of the states. However, the conclusions are the same. The calculations show that NΩ state with IJ = 1/2, 2 is a good dibaryon candidate with narrow width, and ΩΩ state with IJ = 00 is a stable dibaryon against the strong interaction. The calculations also reveal several other possible dibaryon candidates with high angular momentum, ΔΣ*(1/2, 3), ΔΞ*(1, 3), etc. These states may have too wide width to be observed experimentally.

scholarly journals WHICH CONSTITUENT QUARK MODEL IS BETTER?

2003 ◽  
Vol 18 (02n06) ◽  
pp. 356-361 ◽  
Author(s):  
FAN WANG ◽  
JIA-LUN PING ◽  
HOU-RONG PANG ◽  
T. GOLDMAN
Keyword(s):  
Comparative Study ◽  
Quark Model ◽  
Hybrid Model ◽  
Constituent Quark ◽  
Goldstone Boson ◽  
Constituent Quark Model ◽  
Exchange Model ◽  
Meson Exchange ◽  
Boson Exchange ◽  
Quark Models

A comparative study has heen done by calculating the effective baryon-baryon interactions of the 64 lowest channels consisting of octet and decuplet baryons with three constituent quark models: the extended quark gluon exchange model, the Goldstone boson exchange model and the quark gluon meson exchange hybrid model. We find that these three models give similar results for 44 channels. Further tests of these models are discussed.

PARTITION TEMPERATURE AND PION CONDENSATION IN HIGH ENERGY COLLISIONS

1988 ◽  
Vol 03 (07) ◽  
pp. 1603-1614 ◽  
Author(s):  
S.Y. LO ◽  
A. SCHREIBER
Keyword(s):  
High Temperatures ◽  
Low Temperatures ◽  
High Energy ◽  
Temperature Model ◽  
Pion Condensation ◽  
Pion Momentum ◽  
Momentum Distributions ◽  
High Energy Collisions ◽  
Bose Einstein

We develop a description of single pion momentum distributions incorporating Bose-Einstein statistics and compare it to data at ISR and collider energies. Events of fixed multiplicity are described by a temperature which varies as a function of multiplicity. For high temperatures the model gives similar results to the recently introduced partition temperature model. while for low temperatures the possibility of pion condensation is explored.

scholarly journals Longitudinal and Transverse Parton Momentum Distributions for Hadrons within Relativistic Constituent Quark Models

2010 ◽  
Author(s):  
T. Frederico ◽  
E. Pace ◽  
B. Pasquini ◽  
G. Salmè ◽  
Volker Crede ◽  
...  
Keyword(s):  
Constituent Quark ◽  
Momentum Distributions ◽  
Quark Models
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