1 general characteristics of aa collisions at 35 agev yuri kharlov, serguei sadovsky ihep, protvino...
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General characteristics of General characteristics of AA collisions at 35 AGeVAA collisions at 35 AGeV
Yuri Kharlov, Serguei SadovskyYuri Kharlov, Serguei SadovskyIHEP, ProtvinoIHEP, Protvino
LINC-2005, 5 October 2005LINC-2005, 5 October 2005
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Models of ion collisions at Models of ion collisions at middle energiesmiddle energies
RQMDRQMD Relativistic Quantum Molecular DynamicsRelativistic Quantum Molecular Dynamics Microscopic model of heavy ion reactions treating high nuclear resonances, Microscopic model of heavy ion reactions treating high nuclear resonances,
string formation, strangeness productionstring formation, strangeness production Applicable from 1 AGeV to TeV domainApplicable from 1 AGeV to TeV domain http://www.th.physik.uni-frankfurt.de/~mhofmann/rqmd.htmlhttp://www.th.physik.uni-frankfurt.de/~mhofmann/rqmd.html
UrQMDUrQMD Ultra Relativistic Quantum Molecular Dynamics, successor of QMDUltra Relativistic Quantum Molecular Dynamics, successor of QMD Microscopic transport model in terms of interactions between known hadrons Microscopic transport model in terms of interactions between known hadrons
and resonances at and resonances at s<5 GeVs<5 GeV Excitation of color strings and their fragmentation into hadrons at Excitation of color strings and their fragmentation into hadrons at s>5 GeVs>5 GeV Only central (b=0 fm) events are studied to determine the hardest detector loadOnly central (b=0 fm) events are studied to determine the hardest detector load http://www.th.physik.uni-frankfurt.de/~urqmd/http://www.th.physik.uni-frankfurt.de/~urqmd/
PlutoPluto Lepton pair production in ion collisionsLepton pair production in ion collisions Vector mesons are emitted from the fireball with fixed temperature (T=170 MeV Vector mesons are emitted from the fireball with fixed temperature (T=170 MeV
is used)is used) http://www-http://www-hades.gsi.de/computing/pluto/html/PlutoIndex.htmlhades.gsi.de/computing/pluto/html/PlutoIndex.html
FritiofFritiof Lund string model for hadron and nucleus collisionsLund string model for hadron and nucleus collisions Not supposed to be applicable at Not supposed to be applicable at s<10 GeV (a little beyond U70)s<10 GeV (a little beyond U70) http://http://wwwasdoc.web.cern.ch/wwwasdoc/psdir/fritiof.ps.gzwwwasdoc.web.cern.ch/wwwasdoc/psdir/fritiof.ps.gz
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UrQMD C+Pb eventUrQMD C+Pb eventat pat pbeambeam=35 AGeV/c=35 AGeV/c
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ppTT distrbutions: pions ( distrbutions: pions (++, , --, , 00))
CollisionCollision Total Total multiplicimultiplici
tyty
Multiplicity Multiplicity
ppTT>0.1 GeV.c>0.1 GeV.c
C+Pb 102102 8787
C+C 2929 2525
d+C 77 66
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ppTT distrbutions: charged distrbutions: charged kaonskaons
CollisioCollisionn
Total multiplicityTotal multiplicity Multiplicity pMultiplicity pTT>0.1 >0.1 GeV.cGeV.c
C+Pb KK++: 5.2, K: 5.2, K--: 1.9: 1.9 KK++: 4.9, K: 4.9, K--: 1.8: 1.8
C+C KK++: 1.2, K: 1.2, K--: 0.6: 0.6 KK++: 1.2, K: 1.2, K--: 0.6: 0.6
d+C KK++: 0.2, K: 0.2, K--: 0.11: 0.11 KK++: 0.2, K: 0.2, K--: 0.10: 0.10
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ppTT distrbutions: neutral distrbutions: neutral kaonskaons
CollisionCollision Total multiplicityTotal multiplicity Multiplicity pMultiplicity pTT>0.1 GeV.c>0.1 GeV.c
C+Pb KK00LL: 3.6, K: 3.6, K00
SS: 3.5: 3.5 KK00LL: 3.4, K: 3.4, K00
SS: 3.2: 3.2
C+C KK00LL: 0.9, K: 0.9, K00
SS: 0.9: 0.9 KK00LL: 0.9, K: 0.9, K00
SS: 0.9: 0.9
d+C KK00LL: 0.2, K: 0.2, K00
SS: 0.2: 0.2 KK00LL: 0.2, K: 0.2, K00
SS: 0.2: 0.2
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ppTT distrbutions: nucleons distrbutions: nucleons
CollisioCollisionn
Total multiplicityTotal multiplicity Multiplicity pMultiplicity pTT>0.1 >0.1 GeV.cGeV.c
C+Pb p: 91, n: 122p: 91, n: 122 p: 80, n: 107p: 80, n: 107
C+C p: 11, n: 11p: 11, n: 11 p:10, n: 10p:10, n: 10
d+C p: 7, n: 7p: 7, n: 7 p: 5, n: 5p: 5, n: 5
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ppTT distrbutions: anti- distrbutions: anti-nucleonsnucleons
CollisioCollisionn
Total multiplicityTotal multiplicity Multiplicity pMultiplicity pTT>0.1 >0.1 GeV.cGeV.c
C+Pb p-bar: 0.11, n-bar: p-bar: 0.11, n-bar: 0.120.12
p-bar: 0.10, n-bar: p-bar: 0.10, n-bar: 0.120.12
C+C p-bar: 0.06, n-bar: p-bar: 0.06, n-bar: 0.070.07
p-bar: 0.06, n-bar: p-bar: 0.06, n-bar: 0.070.07
d+C p-bar: 0.02, n-bar: p-bar: 0.02, n-bar: 0.020.02
p-bar: 0.02, n: 0.02p-bar: 0.02, n: 0.02
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Rapidity distrbutions: pionsRapidity distrbutions: pions
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Rapidity distrbutions: charged Rapidity distrbutions: charged kaonskaons
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Rapidity distrbutions: neutral Rapidity distrbutions: neutral kaonskaons
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Rapidity distrbutions: Rapidity distrbutions: nucleonsnucleons
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Rapidity distrbutions: anti-Rapidity distrbutions: anti-nucleonsnucleons
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Theta distrbutions: pionsTheta distrbutions: pions
collisiocollisionn
MultiplicityMultiplicity
55<<<20<20
C+Pb 3333
C+C 1212
d+C 33
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Theta distrbutions: charged Theta distrbutions: charged kaonskaons
collisiocollisionn
MultiplicityMultiplicity
55<<<20<20
C+Pb KK++: 2.2, K: 2.2, K--: 0.9: 0.9
C+C KK++: 0.5, K: 0.5, K--: 0.3: 0.3
d+C KK++: 0.10, K-: 0.05: 0.10, K-: 0.05
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Theta distrbutions: neutral Theta distrbutions: neutral kaonskaons
collisioncollision MultiplicityMultiplicity
55<<<20<20
C+Pb KK00LL: 1.5, K: 1.5, K00
SS: 1.4: 1.4
C+C KK00LL: 0.4, K: 0.4, K00
SS: 0.4: 0.4
d+C KK00LL: 0.10, K: 0.10, K00
SS: 0.08: 0.08
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Theta distrbutions: nucleonsTheta distrbutions: nucleons
collisioncollision MultiplicityMultiplicity
55<<<20<20
C+Pb p: 11, n: 13p: 11, n: 13
C+C p: 2, n: 2p: 2, n: 2
d+C p: 0.7, n: 0.7p: 0.7, n: 0.7
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Theta distrbutions: anti-Theta distrbutions: anti-nucleonsnucleons
collisioncollision MultiplicityMultiplicity
55<<<20<20
C+Pb p-bar: 0.04, n-bar: 0.05p-bar: 0.04, n-bar: 0.05
C+C p-bar: 0.03, n-bar: 0.03p-bar: 0.03, n-bar: 0.03
d+C p-bar: 0.01, n-bar: 0.01p-bar: 0.01, n-bar: 0.01
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Vector mesons Vector mesons ee++ee--
Pluto emits vector mesons from the fireball at T=170 MeV, produced in ion collision at pbeam=35 AGeV
0 J/
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SummarySummary
Available event generators allow to Available event generators allow to estimate the detector load by secondary estimate the detector load by secondary particles.particles.
In the most heavy ion collisions achievable In the most heavy ion collisions achievable at U70, C+Pb, one expects to detect up to at U70, C+Pb, one expects to detect up to 50 particles per one central event.50 particles per one central event.
Centrality (impact parameters) can be Centrality (impact parameters) can be measured in the target fragmentation measured in the target fragmentation region, mainly for heavy targets (Pb).region, mainly for heavy targets (Pb).