scholarly journals HADRON ATTENUATION AT HERMES BY (PRE)HADRONIC FSI

2005 ◽  
Vol 20 (02n03) ◽  
pp. 615-617
Author(s):  
K. GALLMEISTER ◽  
W. CASSING ◽  
T. FALTER ◽  
U. MOSEL
Keyword(s):  
Transport Model ◽  
High Energy ◽  
Quantum Mechanical ◽  
Hadronic Final State ◽  
Initial State ◽  
Final State ◽  
Quantum Mechanical Treatment ◽  
Final State Interactions ◽  
Coupled Channel ◽  
Hadron Formation

We investigate hadron formation in high energy electroproduction off complex nuclei in the framework of a BUU transport model. Our approach combines a quantum mechanical treatment of the photon's initial state interactions with a semi-classical coupled channel simulation of the (pre)hadronic final-state interactions (FSI). This allows us to study the hadron attenuation observed at HERMES and to get information on the space-time picture of hadron formation separately for π±, π0, K±, p and [Formula: see text].

LOW ENERGY DOUBLE-PION PHOTOPRODUCTION IN NUCLEI

2005 ◽  
Vol 20 (02n03) ◽  
pp. 578-580 ◽  
Author(s):  
L. ALVAREZ-RUSO ◽  
P. MÜHLICH ◽  
O. BUSS ◽  
U. MOSEL
Keyword(s):  
Transport Model ◽  
Invariant Mass Spectrum ◽  
Pion Photoproduction ◽  
Low Energy ◽  
Medium Effects ◽  
Final State ◽  
Target Mass ◽  
Double Pion ◽  
Final State Interactions ◽  
Coupled Channel

We have investigated π0π0 and π±π0 photoproduction off complex nuclei. Simulations have been performed by means of a semi-classical BUU transport model including a full coupled-channel treatment of the final state interactions. We show that the target mass dependence of the π0π0 invariant mass spectrum as measured by the TAPS collaboration can be explained without introducing medium effects beyond absorption and quasi-elastic scattering of the final state particles. On the other hand, we find considerable discrepancies with the data in the π±π0 channel, which are not understood.

scholarly journals Three-fluid Hydrodynamics-based Event Simulator Extended by UrQMD final State interactions (THESEUS) for FAIR-NICA-SPSBES/RHIC energies

2018 ◽  
Vol 182 ◽  
pp. 02056 ◽  
Author(s):  
P. Batyuk ◽  
D. Blaschke ◽  
M. Bleicher ◽  
Yu.B. Ivanov ◽  
Iu. Karpenko ◽  
...  
Keyword(s):  
Equations Of State ◽  
Transport Model ◽  
Event Generator ◽  
Final State ◽  
First Order Phase Transition ◽  
First Results ◽  
Rapidity Distributions ◽  
Final State Interactions ◽  
Model Equations ◽  
Fluid Hydrodynamics

We present a new event generator based on the three-fluid hydrodynamics (3FH) approach, followed by a particlization at the hydrodynamic decoupling surface and a subsequent UrQMD afterburner stage based on the microscopic UrQMD transport model that accounts for hadronic final state interactions. First results for Au+Au collisions are presented. The following topics are addressed: the directed flow, transversemass spectra, as well as rapidity distributions of protons, pions and kaons for two model equations of state, one with a first-order phase transition, the other with a crossover transition. Preliminary results on the femtoscopy are also discussed.We analyze the accuracy of reproduction of the 3FH results by the new event generator and the effect of the subsequent UrQMD afterburner stage.

scholarly journals Final state hadronic rescattering with UrQMD

2018 ◽  
Vol 171 ◽  
pp. 05003 ◽  
Author(s):  
J. Steinheimer ◽  
V. Vovchenko ◽  
J. Aichelin ◽  
M. Bleicher ◽  
H. Stöcker
Keyword(s):  
Momentum Distribution ◽  
Chemical Equilibrium ◽  
Transport Model ◽  
Local Equilibrium ◽  
High Energy ◽  
Final State ◽  
Nuclear Collisions ◽  
Unstable Particles ◽  
Realistic Description ◽  
Do So

In this talk we discuss the effects of the hadronic rescattering on final state observables in high energy nuclear collisions. We do so by employing the UrQMD transport model for a realistic description of the hadronic decoupling process. The rescattering of hadrons modifies every hadronic bulk observable. For example apparent multiplicity of resonances is suppressed as compared to a chemical equilibrium freeze-out model. Stable and unstable particles change their momentum distribution by more than 30% through rescattering. The hadronic rescattering also leads to a substantial decorrelation of the conserved charge distributions. These findings show that it is all but trivial to conclude from the final state observables on the properties of the system at an earlier time where it may have been in or close to local equilibrium.

Final-state interactions in the high-energy proton-deuteron charge exchange reaction

1977 ◽  
Vol 3 (9) ◽  
pp. 1225-1240 ◽  
Author(s):  
B S Aladashvili ◽  
J -F Germond ◽  
V V Glagolev ◽  
M S Nioradze ◽  
T Siemiarczuk ◽  
...  
Keyword(s):  
Exchange Reaction ◽  
Charge Exchange ◽  
High Energy ◽  
High Energy Proton ◽  
Final State ◽  
Charge Exchange Reaction ◽  
Energy Proton ◽  
Final State Interactions

scholarly journals Studying High Energy Final State Interactions by N/D Method

2000 ◽  
Vol 17 (7) ◽  
pp. 475-477
Author(s):  
Yuan Feng ◽  
Zheng Han-Qing
Keyword(s):  
High Energy ◽  
Final State ◽  
Final State Interactions

scholarly journals Sensitivity of future linear $$\hbox {e}^+\hbox {e}^-$$ colliders to processes of dark matter production with light mediator exchange

2021 ◽  
Vol 81 (10) ◽  
Author(s):  
Jan Kalinowski ◽  
Wojciech Kotlarski ◽  
Krzysztof Mȩkała ◽  
Paweł Sopicki ◽  
Aleksander Filip Żarnecki
Keyword(s):  
Dark Matter ◽  
Linear Collider ◽  
Production Cross ◽  
Photon Emission ◽  
International Linear Collider ◽  
High Energy ◽  
Initial State ◽  
Final State ◽  
State Radiation ◽  
Wide Range

AbstractAs any $$e^+e^-$$ e + e - scattering process can be accompanied by a hard photon emission from the initial state radiation, the analysis of the energy spectrum and angular distributions of those photons can be used to search for hard processes with an invisible final state. Thus high energy $$e^+e^-$$ e + e - colliders offer a unique possibility for the most general search of dark matter (DM) based on the mono-photon signature. We consider production of DM particles at the International Linear Collider (ILC) and Compact Linear Collider (CLIC) experiments via a light mediator exchange. Detector effects are taken into account within the Delphes fast simulation framework. Limits on the light DM production in a simplified model are set as a function of the mediator mass and width based on the expected two-dimensional distributions of the reconstructed mono-photon events. The experimental sensitivity is extracted in terms of the DM production cross section. Limits on the mediator couplings are then presented for a wide range of mediator masses and widths. For light mediators, for masses up to the centre-of-mass energy of the collider, coupling limits derived from the mono-photon analysis are more stringent than those expected from direct resonance searches in decay channels to SM particles.

scholarly journals Hyperon polarization and final state interactions in high-energy inclusive pN scattering

1987 ◽  
Vol 193 (2-3) ◽  
pp. 361-367 ◽  
Author(s):  
P. Cea ◽  
P. Chiappetta ◽  
J.-Ph. Guillet ◽  
G. Nardulli
Keyword(s):  
High Energy ◽  
Final State ◽  
Final State Interactions

Electromagnetic breakup of the deuteron in the Δ resonance region

1984 ◽  
Vol 62 (11) ◽  
pp. 1036-1045 ◽  
Author(s):  
W. Leidemann ◽  
H. Arenhövel
Keyword(s):  
Cross Section ◽  
Degrees Of Freedom ◽  
Impulse Approximation ◽  
Resonance Region ◽  
Final State ◽  
Channel Calculation ◽  
Main Emphasis ◽  
Coupled Channel Calculation ◽  
Final State Interactions ◽  
Coupled Channel

The processes d(γ, p)n and d(e, e′p)n have been studied in the Δ resonance region with explicit Δ degrees of freedom in a coupled channel treatment that includes all final state interactions. In particular, the dependence on the model for the potential and the Δ parametrization has been investigated. The main emphasis has been put on the photodisintegration. The total cross section for this process is considerably reduced by inclusion of the Δ interactions, resulting in better agreement with a recent experiment. The angular distribution up to the resonance region shows a stronger forward and backward peaking than experimental results do, while above the resonance the agreement is better. Whereas the γ asymmetry is affected very little by the coupled channel calculation compared with the impulse approximation, the proton polarization is quite sensitive to the proper treatment of the Δ degrees of freedom.

scholarly journals THREE-BODY COULOMB FINAL-STATE INTERACTION EFFECTS IN THE COULOMB BREAKUP OF LIGHT NUCLEI

2005 ◽  
Vol 20 (13) ◽  
pp. 947-963 ◽  
Author(s):  
E. O. ALT ◽  
B. F. IRGAZIEV ◽  
A. M. MUKHAMEDZHANOV
Keyword(s):  
Final State Interaction ◽  
Nuclear Astrophysics ◽  
Coulomb Field ◽  
Theoretical Interpretation ◽  
Final State ◽  
Coulomb Breakup ◽  
Quantum Mechanical Treatment ◽  
Dissociation Cross Section ◽  
Final State Interactions ◽  
Three Body

Coulomb breakup of a projectile in the Coulomb field of a fully stripped heavy nucleus is at present one of the most popular experimental methods to obtain information on reactions of interest in nuclear astrophysics. Its theoretical interpretation presents, however, considerable difficulties, due to the three-body nature and the infinite range of the Coulomb forces involved. Among the uncertainties affecting present analyses, the possible modification of the dissociation cross-section by three-body Coulomb final-state interactions plays a major role. Various methods which have been proposed to deal with it are briefly reviewed. However, none of them is based on a consistent and mathematically satisfactory quantum mechanical treatment, with the exception of the one proposed recently. The latter, being based on the prior form of the dissociation amplitude, makes use of a genuine three-charged particle wave function for the final state which is an exact solution of the three-body Schrödinger equation, albeit only asymptotically, i.e. for large distances. Nevertheless, interesting conclusion can be drawn concerning the influence of three-body Coulomb final-state interactions on quantities of astrophysical interest.

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