scholarly journals FORWARD PION PRODUCTION AT LARGE TRANSVERSE MOMENTA IN pp COLLISIONS AND BEYOND

2007 ◽  
Vol 22 (02n03) ◽  
pp. 587-590
Author(s):  
WOLFGANG SCHÄFER
Keyword(s):  
Pion Production ◽  
High Energy ◽  
Inclusive Production ◽  
Pp Collisions ◽  
Initial State ◽  
Fock State ◽  
Beam Fragmentation ◽  
Hadronic Collisions ◽  
Nuclear Targets

The inclusive production of high-p⊥ particles (pions) in the beam fragmentation regions of high–energy hadronic collisions is driven by the breakup of valence constituents of the beam hadrons into their two–body Fock–state components,and their subsequent fragmentation. We briefly discuss an approach, that allows the consistent inclusion of intrinsic and radiatively generated transverse momenta of initial state partons, and describe an extension of our approach to nuclear targets.

scholarly journals Pion production in high-energy nucleus-nucleus collisions

1987 ◽  
Vol 58 (5) ◽  
pp. 463-466 ◽  
Author(s):  
J. W. Harris ◽  
G. Odyniec ◽  
H. G. Pugh ◽  
L. S. Schroeder ◽  
M. L. Tincknell ◽  
...  
Keyword(s):  
Pion Production ◽  
High Energy

ISOSPIN DECOMPOSITION OF pp → NNππ CROSS SECTIONS — DO WE SEE A SIGN OF Δ(1600) EXCITATION IN THE nnπ+π+ CHANNEL?

2009 ◽  
Vol 24 (02n03) ◽  
pp. 450-453
Author(s):  
◽  
T. SKORODKO ◽  
M. BASHKANOV ◽  
D. BOGOSLOWSKY ◽  
H. CALÉN ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Pion Production ◽  
Significant Contribution ◽  
Differential Cross Sections ◽  
Pp Collisions ◽  
Theoretical Predictions ◽  
Order Of Magnitude ◽  
The Cross

The two-pion production in pp-collisions has been investigated in exclusive measurements from threshold up to Tp = 1.36 GeV . Total and differential cross sections have been obtained for the channels pnπ+π0, ppπ+π-, ppπ0π0 and also nnπ+π+. For intermediate incident energies Tp > 1 GeV , i.e. in the region, which is beyond the Roper excitation but at the onset of ΔΔ excitation the total ppπ0π0 cross section falls behind theoretical predictions by as much as an order of magnitude near 1.2 GeV, whereas the nnπ+π+ cross section is a factor of five larger than predicted. A model-unconstrained isospin decompostion of the cross section points to a significant contribution of an isospin 3/2 resonance other than the Δ(1232). As a possible candidate the Δ(1600) is discussed.

TWO-PION PRODUCTION IN pp COLLISIONS FROM THRESHOLD UP TO THE ΔΔ REGION AND THE ASPECT OF BOSE-EINSTEIN CORRELATIONS

2005 ◽  
Vol 20 (02n03) ◽  
pp. 671-673 ◽  
Author(s):  
◽  
T. SKORODKO ◽  
M. BASHKANOV ◽  
H. CLEMENT ◽  
E. DOROSHKEVICH ◽  
...  
Keyword(s):  
Energy Range ◽  
Pion Production ◽  
Pp Collisions ◽  
Special Configuration ◽  
Bose Einstein

The pp→ppπ+π- and pp→ppπ0π0 reactions have been measured at CELSIUS in the energy range Tp=775-1360 MeV using the WASA 4π detector. For Tp<1 GeV the data are in accordance with Roper excitation and σ correlations in the ππ system, respectively. For Tp>1 GeV they agree with ΔΔ excitation in the special configuration (ΔΔ)0+. For the π0π0 channel an enhancement at low Mπ0π0 masses is observed, which possibly points to Bose-Einstein correlations.

scholarly journals SELECTED TOPICS IN HIGH ENERGY SEMI-EXCLUSIVE ELECTRO-NUCLEAR REACTIONS

2001 ◽  
Vol 10 (06) ◽  
pp. 405-457 ◽  
Author(s):  
MISAK M. SARGSIAN
Keyword(s):  
Present Status ◽  
Short Range ◽  
Nuclear Reactions ◽  
Eikonal Approximation ◽  
High Energy ◽  
Glauber Theory ◽  
Nucleon Recoil ◽  
High Energy Scattering ◽  
Nuclear Targets ◽  
Short Range Correlations

We review the present status of the theory of high energy reactions with semi-exclusive nucleon electro-production from nuclear targets. We demonstrate how the increase of transferred energies in these reactions opens a completely new window for study of the microscopic nuclear structure at small distances. The simplifications in theoretical descriptions associated with the increase in the energies are discussed. The theoretical framework for calculation of high energy nuclear reactions based on the effective Feynman diagram rules is described in detail. The result of this approach is the generalized eikonal approximation (GEA), which is reduced to the Glauber approximation when nucleon recoil is neglected. The method of GEA is demonstrated in the calculation of high energy electro-disintegration of the deuteron and A=3 targets. Subsequently, we generalize the obtained formulae for A>3 nuclei. The relation of GEA to the Glauber theory is analyzed. Then, based on the GEA framework we discuss some of the phenomena which can be studied in exclusive reactions: nuclear transparency and short-range correlations in nuclei. We illustrate how light-cone dynamics of high-energy scattering emerge naturally in high energy electro-nuclear reactions.

INFLUENCE OF INTRINSIC DECOHERENCE ON THE ENTANGLEMENT BETWEEN TWO ATOMS IN TAVIS–CUMMINGS MODEL

2008 ◽  
Vol 06 (01) ◽  
pp. 167-179
Author(s):  
CHUAN-JIA SHAN ◽  
WEI-WEN CHENG ◽  
TANG-KUN LIU ◽  
YAN-XIA HUANG ◽  
HONG LI ◽  
...  
Keyword(s):  
Strong Coupling ◽  
Quantum State ◽  
Dipole Interaction ◽  
Entangled State ◽  
Entanglement Dynamics ◽  
Initial State ◽  
Intrinsic Decoherence ◽  
Dipole Coupling ◽  
Fock State

Considering the dipole–dipole coupling intensity between two atoms and the field in the Fock state, the entanglement dynamics between two atoms that are initially entangled in the Tavis–Cummings model with intrinsic decoherence have been investigated. The two-atom entanglement appears with periodicity without considering intrinsic decoherence. However, the intrinsic decoherence causes the decay of entanglement between two atoms, with the decrease of the intrinsic decoherence coefficient, the entanglement will quickly become a constant value, which is affected by the two-atom initial state, the dipole–dipole coupling intensity and the field in the Fock state. Meanwhile, the two-atom quantum state will stay forever in the maximal entangled state when the initial state is proper, even in the presence of intrinsic decoherence. Furthermore, the two atoms can generate maximal entangled state even if they are initially separated by adjusting the dipole–dipole interaction, the strong coupling can improve the value of entanglement.

scholarly journals Hadron-jet correlations in high-energy hadronic collisions at the LHC

2018 ◽  
Vol 78 (9) ◽  
Author(s):  
Andrèe D. Bolognino ◽  
Francesco G. Celiberto ◽  
Dmitry Yu. Ivanov ◽  
Mohammed M. A. Mohammed ◽  
Alessandro Papa
Keyword(s):  
High Energy ◽  
Hadronic Collisions
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