Two-pion production inαpscattering at 1 GeV/nucleon in the energy region of the Roper resonance excitation

2008 ◽  
Vol 78 (2) ◽  
Author(s):  
G. D. Alkhazov ◽  
W. Augustyniak ◽  
M. Boivin ◽  
J.-L. Boyard ◽  
L. Farhi ◽  
...  
Keyword(s):  
Energy Region ◽  
Pion Production ◽  
Resonance Excitation ◽  
Roper Resonance

TWO PION PRODUCTION IN THE RESONANCE ENERGY REGION

2014 ◽  
Vol 26 ◽  
pp. 1460064
Author(s):  
VITALY SHKLYAR ◽  
HORST LENSKE ◽  
ULRICH MOSEL
Keyword(s):  
Energy Region ◽  
Pion Production ◽  
Resonance Energy ◽  
Pion Exchange ◽  
Roper Resonance ◽  
Crystal Ball ◽  
Nice Agreement ◽  
Coupled Channel

The coupled-channel unitary Lagrangian (Giessen) model is extended to study two pion production within the isobar approximation. The effect from the t-channel pion exchange to the πN → σN reaction is found to be small which is in line with the previous conclusions by the Crystal Ball collaboration. The calculations with the genuine Roper resonance are found to be in nice agreement with both the Crystal Ball measurements of the 2πN production and the GWU single energy solutions in the elastic πN channel.

scholarly journals Study of baryonic resonances and ρ meson production in the reaction pp → ppπ+π− at 3.5 GeV with HADES

2019 ◽  
Vol 199 ◽  
pp. 02012 ◽  
Author(s):  
Amel Belounnas
Keyword(s):  
Monte Carlo ◽  
Kinetic Energy ◽  
Monte Carlo Simulations ◽  
Pion Production ◽  
Good Description ◽  
Meson Production ◽  
Baryon Resonance ◽  
Resonance Excitation ◽  
Experimental Setup ◽  
Resonance Model

We report on measurements of baryon resonance and ρ meson production in the exclusive pp → ppπ+π− channel at a beam kinetic energy of 3.5 GeV measured with the HADES experimental setup. The differential distributions are compared to Monte Carlo simulations based on a resonance model assuming an incoherent sum of contributions of various baryonic resonances with masses below 2 GeV and using inputs from one pion production measured in the same experiment. A very good description of the two pion production is achieved allowing for an estimate of the contribution of one and double baryon-resonance excitation. Using appropriate kinematical cuts the ρ meson signal could also be extracted.

Tensor analyzing power T20 for cumulative pion production from deuterons in the GeV energy region

1997 ◽  
Vol 625 (4) ◽  
pp. 817-831 ◽  
Author(s):  
S. Afanasiev ◽  
Yu. Anisimov ◽  
M. Fujieda ◽  
S. Fukui ◽  
T. Hasegawa ◽  
...  
Keyword(s):  
Energy Region ◽  
Pion Production ◽  
Analyzing Power

Phenomenological model for describing pion-pair production on a proton by virtual photons in the energy region of nucleon-resonance excitation

2001 ◽  
Vol 64 (7) ◽  
pp. 1292-1298 ◽  
Author(s):  
V. I. Mokeev ◽  
M. Ripani ◽  
M. Anginolfi ◽  
M. Battaglieri ◽  
E. N. Golovach ◽  
...  
Keyword(s):  
Pair Production ◽  
Phenomenological Model ◽  
Energy Region ◽  
Nucleon Resonance ◽  
Resonance Excitation ◽  
Pion Pair ◽  
Virtual Photons

Evidence of Δ(1232)-Resonance Excitation in Subthreshold Pion Production at Intermediate Energies

1996 ◽  
pp. 291-297
Author(s):  
A. Badalà ◽  
R. Barbera ◽  
A. Bonasera ◽  
A. Palmeri ◽  
G. S. Pappalardo ◽  
...  
Keyword(s):  
Pion Production ◽  
Resonance Excitation ◽  
Intermediate Energies

Roper resonance—Its static and dynamic properties from single- and double-pion production

2008 ◽  
Vol 61 (1) ◽  
pp. 168-169 ◽  
Author(s):  
T. Skorodko ◽  
M. Bashkanov ◽  
H. Clement ◽  
E. Doroshkevich ◽  
O. Khakimova ◽  
...  
Keyword(s):  
Pion Production ◽  
Dynamic Properties ◽  
Roper Resonance ◽  
Double Pion

TWO-PION PRODUCTION, γγ LINE AND ASPECTS OF σ MESON, BOSE–EINSTEIN CORRELATIONS AND ISOSPIN BREAKING

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1747-1752 ◽  
Author(s):  
◽  
H. CLEMENT ◽  
M. BASHKANOV ◽  
E. DOROSHKEVICH ◽  
M. KASKULOV ◽  
...  
Keyword(s):  
Energy Range ◽  
Pion Production ◽  
Roper Resonance ◽  
Isospin Breaking ◽  
Bose Einstein ◽  
Dynamic Formation

The pp→ppx(x=γγ, π0π0, π+π-) reactions have been measured at CELSIUS in the energy range Tp=775-1360 MeV using the WASA 4π detector with hydrogen pellet target. Close to threshold the ppπ+π- data are in accordance with the Roper resonance concept and/or a dynamic formation of the σ meson. At higher energies the formation of the ΔΔ system becomes increasingly dominant. The ppπ0π0 channel basically shows similar features, however, develops a peculiar enhancement at small invariant masses Mπ0π0 - in resemblance of Bose-Einstein correlations. Alternatively, the enhancement could be also indicative of a (dynamic) isospin breaking due to ππ rescattering in the σ channel. The latter is favored by the results on pd→3 He x (x=π0π0, π+π-), where the observed π0π0 enhancements are still much larger. In the γγ channel a line at Mγγ=2mπ is observed. The possible nature of this line is discussed.

Excitation of the Roper resonance in single- and double-pion production in nucleon-nucleon collisions

NSTAR 2007 ◽  
2008 ◽  
pp. 228-230
Author(s):  
T. Skorodko ◽  
◽  
M. Bashkanov ◽  
D. Bogoslawsky ◽  
H. Calen ◽  
...  
Keyword(s):  
Pion Production ◽  
Nucleon Nucleon ◽  
Roper Resonance ◽  
Double Pion
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