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MPD:
detector simulation and
physics performance studies
Oleg Rogachevsky (JINR & PNPI RAS)
for MPD group
NICA Roundtable Workshop IV: Physics at NICA
11 September 2009
Dubna
MPD design
11 September 2009
2
MPD simulation
Software:
MpdRoot (inherit from FairRoot)
Computing:
LHEP PC farm
LIT PC farm
Monte Carlo generators:
UrQMD v. 2.3
Pluto v. 4.12
Pythia 6
SHIELD (N.Sobolevsky INR)
FastMC (N. Amelin et al.)
LAQGSM ( K.Gudima et al. IAP ASM Moldova)
11 September 2009
http://mpd.jinr.ru
3
Time Projection Chamber
Pad responces
the main tracking detector
at || <1.2
and pT >100 MeV/c
more details
in S.Rasin’s report
1 time sample
GEANT
implementation
All samples for event
11 September 2009
4
Time Of Flight
GEANT
660 RPC multigap counters.
Mass separation with TOF
11 September 2009
5
Zero Degree Calorimeter
Centrality classication of events
GEANT geometry
60 layers of lead-scintillator sandwiches
sampling ratio 4:1
The total kinetic energy of spectators passing through
ZDC as a function of impact parameter for Au+Au
collisions at sNN = 9 GeV.
left : events from UrQMD,
right : LAQGSM
11 September 2009
6
CPC, BBC & Endcap straw tracker
Beam Beam Counter
Endcap straw tracker
Cathode Pad Chamber
Inner tracker
11 September 2009
7
Forward Spectrometer
11 September 2009
8
Physics performances studies
(first stage)
 Multiplicity and spectral
characteristics of the identified
hadrons including strange particles,
multi-strange baryons and antibaryons
characterizing entropy production
and system temperature at freeze-out.
 Event-by-event fluctuations in
multiplicity, charges, transverse
momenta and K/ ratios as a generic
property of critical phenomena
 Collective flow effects (directed,
elliptic and higher ones) for hadrons
including strange particles.
 HBT interferometry of identified
particles and particle correlations
(femtoscopy)
11 September 2009
9
Tracks & vertex reconstruction
TPC R = 500 m Z = 7 mm
Efficiency of track finding
Relative transverse momentum
errors for all particles
The primary vertex position resolution along
the beam axis versus the reconstructed
primary track multiplicity in the TPC
11 September 2009
10
Tracks & vertex reconstruction
TPC R = 500 m, Z = 7 mm
ITS R = 23 m, Z = 120 m
11 September 2009
11
Multiplicity fluctuations
UrQMD central Au+Au collisions
Scaled multiplicity variances for charged, negative and
positive particles in TPC acceptance
11 September 2009
12
Transverse momentum fluctuations
UrQMD central Au+Au collisions
Transverse momentum dynamical fluctuations for
charged, negative and positive particles
11 September 2009
13
Strange particles
TPC only
S/B
The
Ks0
and
0
finding eciency as a function of pseudorapidity.
Ks0
1.64
0
2.54
TPC&ITS
in progress
The Ks0 and 0 finding eciency as a function of transverse momentum.
11 September 2009
14
Femtoscopy pions
FastMC Au+Au  s = 7 GeV
Transverse momentum
dependence of identical pionpion correlation radii
 incoherence parameter
11 September 2009
15
Femtoscopy kaons
FastMC Au+Au  s = 7 GeV
Transverse momentum
dependence of identical kaonkaon correlation radii
 incoherence parameter
11 September 2009
16
Study of K/ ratio
The collision energy dependence of K+/+ and K/ratio variances
open triangles  UrQMD
filled  UrQMD & MPD
more details in V. Kolesnikov report
11 September 2009
17
Electromagnetic probes
Single photon registration efficiency
I.Tyapkin
Electromagnetic probes study with Electromagnetic
Calorimeter MPD/NICA
11 September 2009
18
Direct flow
FastMC Au+Au  s = 7 GeV
Transverse momentum and pseudorapidity dependence of the direct flow.
open triangles  UrQMD
filled circles  UrQMD & MPD
11 September 2009
19
Elliptic flow
FastMC Au+Au  s = 7 GeV
Transverse momentum and pseudorapidity dependence of the elliptic flow
open triangles  UrQMD
filled circles  UrQMD & MPD
11 September 2009
20
Feasibility of J/psi production
A.Maevskaya
Feasibility of J/psi production study by MPD detector
11 September 2009
21
And many others .....
A.V. Stavinsky
Dense cold matter at NICA
V.D. Toneev
Energy and system-size dependence of the chiral magnetic
effect, estimates for NICA
All proposals to NICA “White Paper”

11 September 2009
22
The long & winding road
Thanks ...
11 September 2009
23
MPD project steps
Round Table Discussion I. July 7 - 9, 2005
Searching for the mixed phase of strongly interacting matter at the
JINR Nuclotron
Round Table Discussion II October 6-7, 2006
Searching for the mixed phase of strongly interacting matter at the JINR
Nuclotron: Nuclotron facility development
MPD Letter of Intent
Round Table Discussion III
November 5 - 6, 2008
Searching for the mixed phase of strongly interacting
QCD matter at the NICA/MPD
MPD Conceptual Design Report, NICA White paper
Round Table Discussion IV
September 7 - 11, 2009
Searching for the mixed phase of strongly interacting
QCD matter at the NICA: Physics at NICA (White Paper)
11 September 2009
24
Event simulation
UrQMD AuAu collision at
11 September 2009
s= 9 AGeV
25
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