Aditya Nath Mishra Indian Institute of Technology Indore, INDIA ISMD2014 (Italy, September 8-12, 2014) Multiparticle production in nuclear collisions using effective energy approach A.N. Mishra, R. Sahoo, E.K.G. Sarkisyan, A.S. Sakharov arXiv:1405.2819
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Aditya Nath Mishra! Indian Institute of Technology Indore, INDIA!
ISMD2014 (Italy, September 8-12, 2014)!!
Multiparticle production in nuclear collisions using effective energy approach!
A.N. Mishra, R. Sahoo, E.K.G. Sarkisyan, A.S. Sakharov !arXiv:1405.2819 !
Motivation Bulk observables - mean multiplicity and rapidity densities - control parameters of the formation and evolution of the collision initial state !!Extensively studied in heavy-ion collisions at RHIC !
Aditya Nath Mishra ISMD2014, Italy 1
Motivation Bulk observables - mean multiplicity and rapidity densities - control parameters of the formation and evolution of the collision initial state !!Extensively studied in heavy-ion collisions at RHIC !Similarities with e+e- and pp data: !universality in multihadron production !
30% of a spectator energy?
Aditya Nath Mishra ISMD2014, Italy 1
Motivation Bulk observables - mean multiplicity and rapidity densities - control parameters of the formation and evolution of the collision initial state !!Extensively studied in heavy-ion collisions at RHIC !Similarities with e+e- and pp data: !universality in multihadron production !
pp multiplicity data to !be scaled !
30% of a spectator energy?
Aditya Nath Mishra ISMD2014, Italy 1
Motivation Bulk observables - mean multiplicity and rapidity densities - control parameters of the formation and evolution of the collision initial state !!Extensively studied in heavy-ion collisions at RHIC !Similarities with e+e- and pp data: !universality in multihadron production !
pp multiplicity data to !be scaled !
30% of a spectator energy?
pp midrapidity density does not obey a similar scaling !
Aditya Nath Mishra ISMD2014, Italy 1
Motivation Bulk observables - mean multiplicity and rapidity densities - control parameters of the formation and evolution of the collision initial state !!Extensively studied in heavy-ion collisions at RHIC !Similarities with e+e- and pp data: !universality in multihadron production !
pp multiplicity data to !be scaled !
Not the same scaling for both variables and for different types of interactions!
30% of a spectator energy?
pp midrapidity density does not obey a similar scaling !
Aditya Nath Mishra ISMD2014, Italy 1
J.F. Grosse-‐Oetringhaus and K. Reygers (2010): K=1/3, n0~2
Constituent Quark Framework No nucleon participant dependence as soon as calculated in the constituent quark framework!
R.Sahoo, A.N.M. (2014)!
Aditya Nath Mishra ISMD2014, Italy 2
Nucleon part.
Quark part.
Nucleon Participant: Open vs solid symbols: hijing vs overlap model!Quark Participant: Open vs solid symbols: different σpp!!
Constituent Quark Framework No nucleon participant dependence as soon as calculated in the constituent quark framework!!AA centrality data are similar to NSD measurements!
Constituent Quark Framework No nucleon participant dependence as soon as calculated in the constituent quark framework!!AA centrality data are similar to NSD measurements!!Quark degrees of freedom seem to !play a role, not the nucleon ones!!
Energy Scaling vs. Types of Collisions ü e+e- (structureless particles) annihilation - the total interaction energy
is deposited in the initial state !
ü pp (superposition of three pairs of constituents) collision - only the energy of the interacting single quark pair is deposited in the initial state !
ü Both multiplicity and midrapidity density should be similar in pp at c.m. energy √spp and e+e- at c.m. energy √see≈ √spp/3 !
Aditya Nath Mishra ISMD2014, Italy 3
Energy Scaling vs. Types of Collisions ü e+e- (structureless particles) annihilation - the total interaction energy
is deposited in the initial state !
ü pp (superposition of three pairs of constituents) collision - only the energy of the interacting single quark pair is deposited in the initial state !
ü Both multiplicity and midrapidity density should be similar in pp at c.m. energy √spp and e+e- at c.m. energy √see≈ √spp/3 !
ü Head-on heavy ion collisions: all three quarks participate nearly simultaneously and deposit their energy coherently into initial state!
ü Both multiplicity and midrapidity density should be similar in pp at c.m. energy √spp and head-on AA at c.m. energy √sNN ≈ √spp/3 !
!
Aditya Nath Mishra ISMD2014, Italy 3
E. Sarkisyan & A. Sakharov (2004) : dissipaBng energy parBcipants
Hydrodynamics of Collisions Ø Two head-on colliding Lorentz-contracted particles stop within
the overlapped zone !v Formation of fully thermalized initial state at the collision moment!v The decay (expansion) of the initial state is governed by relativistic ! hydrodynamics - Landau model (1953)!
4 ISMD2014, Italy Aditya Nath Mishra
Hydrodynamics of Collisions Ø Two head-on colliding Lorentz-contracted particles stop within
the overlapped zone !v Formation of fully thermalized initial state at the collision moment!v The decay (expansion) of the initial state is governed by relativistic ! hydrodynamics - Landau model (1953)!
Steinberg, nucl-‐ex/0405022
4 ISMD2014, Italy Aditya Nath Mishra
Hydrodynamics of Collisions Ø Two head-on colliding Lorentz-contracted particles stop within
the overlapped zone !v Formation of fully thermalized initial state at the collision moment!v The decay (expansion) of the initial state is governed by relativistic ! hydrodynamics - Landau model (1953)!
Steinberg, nucl-‐ex/0405022
BRAHMS, nucl-‐ex/0410003
2Nch
Npart
exp(�y
2/2L)p2⇡L
, L = ln
ps
2m
4 ISMD2014, Italy Aditya Nath Mishra
Hydrodynamics of Collisions Ø Two head-on colliding Lorentz-contracted particles stop within
the overlapped zone !v Formation of fully thermalized initial state at the collision moment!v The decay (expansion) of the initial state is governed by relativistic ! hydrodynamics - Landau model (1953)!
Steinberg, nucl-‐ex/0405022
BRAHMS, nucl-‐ex/0410003
2Nch
Npart
exp(�y
2/2L)p2⇡L
, L = ln
ps
2m
4 ISMD2014, Italy Aditya Nath Mishra
• The production of secondaries is defined by the energy deposited ! into the initial state!
Hydrodynamics & Energy Scaling vs Data from Landau Hydrodynamics !
⇢(0) = ⇢pp(0)2Nch
NpartNppch
rLpp
LNNL = ln
ps
2m
Aditya Nath Mishra ISMD2014, Italy 5
Hydrodynamics & Energy Scaling vs Data from Landau Hydrodynamics !
Effective energy dissip. modelprediction for 3s<NN = 5.52 TeVCMS 2.76 TeV × 1.43
Upto top RHIC energy the data show slight increase as centrality decreases!!LHC data has monotonic increasing behavior!!CQM+Landau calculations have a very good agreement with data!
Effective energy dissip. modelprediction for 3s<NN = 5.52 TeVCMS 2.76 TeV × 1.43
Upto top RHIC energy the data show slight increase as centrality decreases!!LHC data has monotonic increasing behavior!!CQM+Landau calculations have a very good agreement with data!!Effective energy dissipation (red line of the fit to head-on c o l l i s i o n d a t a e n e r g y dependence [next slide]) also explains data and gives predictions at √sNN= 5.52 TeV!!
Nch is calculated at √sNN = εNN!ρpp(0) and Npp
ch are calculated at !√spp = 3εNN! Aditya Nath Mishra ISMD2014, Italy 7
Charged Particle Mid-rapidity Density ü Similarity in all the data from
peripheral to the most central ones follow the same energy behavior!
2
4
6
8
10
12
14
1 10 10 2 10 3
3s<
NN , ¡NN [GeV]
l(0)
= 2
dN ch
/dd
| d=0
/ N pa
rt
AA central collisionsLHC data
ALICEATLASCMS
RHIC AuAu dataBRAHMSPHENIX
PHOBOS STAR
SPS dataNA45NA49
AGS dataE802/917
GSI dataFOPI
hybrid fit: log(s) + power-lawpower-law fitlog(s) fit up to RHIC data
Energy dissipation model calculationfor AA centrality data at ¡NN
CMSPHOBOSSTAR
Fits to weighted LHC and RHIC dataLHC: ALICE, ATLAS, CMSRHIC: PHENIX, PHOBOS, STAR
hybrid fit: log(s) + power-lawpower-law fit
Prediction for AA at 3s<NN = 5.52 TeV
Aditya Nath Mishra ISMD2014, Italy 8
Charged Particle Mid-rapidity Density ü Similarity in all the data from
peripheral to the most central ones follow the same energy behavior!
ü Hybrid fit to both the most central (head-on)and centrality data sets are close enough!
!
2
4
6
8
10
12
14
1 10 10 2 10 3
3s<
NN , ¡NN [GeV]
l(0)
= 2
dN ch
/dd
| d=0
/ N pa
rt
AA central collisionsLHC data
ALICEATLASCMS
RHIC AuAu dataBRAHMSPHENIX
PHOBOS STAR
SPS dataNA45NA49
AGS dataE802/917
GSI dataFOPI
hybrid fit: log(s) + power-lawpower-law fitlog(s) fit up to RHIC data
Energy dissipation model calculationfor AA centrality data at ¡NN
CMSPHOBOSSTAR
Fits to weighted LHC and RHIC dataLHC: ALICE, ATLAS, CMSRHIC: PHENIX, PHOBOS, STAR
hybrid fit: log(s) + power-lawpower-law fit
Prediction for AA at 3s<NN = 5.52 TeV
Aditya Nath Mishra ISMD2014, Italy 8
Charged Particle Mid-rapidity Density ü Similarity in all the data from
peripheral to the most central ones follow the same energy behavior!
ü Hybrid fit to both the most central (head-on)and centrality data sets are close enough!
!ü Model well reproduces the
data under the assumption of the effective energy deriving the multi-particle production process!
!ü The combined data indicate
possible transition to a new regime at √sNN=0.5-1.0 TeV!
2
4
6
8
10
12
14
1 10 10 2 10 3
3s<
NN , ¡NN [GeV]
l(0)
= 2
dN ch
/dd
| d=0
/ N pa
rt
AA central collisionsLHC data
ALICEATLASCMS
RHIC AuAu dataBRAHMSPHENIX
PHOBOS STAR
SPS dataNA45NA49
AGS dataE802/917
GSI dataFOPI
hybrid fit: log(s) + power-lawpower-law fitlog(s) fit up to RHIC data
Energy dissipation model calculationfor AA centrality data at ¡NN
CMSPHOBOSSTAR
Fits to weighted LHC and RHIC dataLHC: ALICE, ATLAS, CMSRHIC: PHENIX, PHOBOS, STAR
hybrid fit: log(s) + power-lawpower-law fit
Prediction for AA at 3s<NN = 5.52 TeV
Aditya Nath Mishra ISMD2014, Italy 8
Charged Particle Mid-rapidity Density ü Similarity in all the data from
peripheral to the most central ones follow the same energy behavior!
ü Hybrid fit to both the most central (head-on)and centrality data sets are close enough!
!ü Model well reproduces the
data under the assumption of the effective energy deriving the multi-particle production process!
!ü The combined data indicate
possible transition to a new regime at √sNN=0.5-1.0 TeV!
2
4
6
8
10
12
14
1 10 10 2 10 3
3s<
NN , ¡NN [GeV]
l(0)
= 2
dN ch
/dd
| d=0
/ N pa
rt
AA central collisionsLHC data
ALICEATLASCMS
RHIC AuAu dataBRAHMSPHENIX
PHOBOS STAR
SPS dataNA45NA49
AGS dataE802/917
GSI dataFOPI
hybrid fit: log(s) + power-lawpower-law fitlog(s) fit up to RHIC data
Energy dissipation model calculationfor AA centrality data at ¡NN
CMSPHOBOSSTAR
Fits to weighted LHC and RHIC dataLHC: ALICE, ATLAS, CMSRHIC: PHENIX, PHOBOS, STAR
hybrid fit: log(s) + power-lawpower-law fit
Prediction for AA at 3s<NN = 5.52 TeV
PredicYon for charged parYcle mid-‐rapidity density for Pb+Pb collisions at √sNN = 5.52 TeV is about 12.0 (within 10% uncertainty)
Aditya Nath Mishra ISMD2014, Italy 8
Charged Particle Mid-rapidity Density ü Hybrid fit to both the central
and centrality data sets are close enough!
!ü Model well reproduces the
data under the assumption of the effective energy deriving the multi-particle production process!
ü Similarity in all the data from peripheral to the most central ones follow the same energy behavior!
ü The combined data indicate possible transition to a new regime at √sNN=0.5-1.0 TeV!
PredicYon for charged parYcle mid-‐rapidity density for Pb+Pb collisions at √sNN = 5.52 TeV is about 12.0 (within 10% uncertainty)
Effective energy dissip. modelprediction for 3s<NN = 5.52 TeVCMS 2.76 TeV × 1.43
2
4
6
8
10
12
14
1 10 10 2 10 3
3s<
NN , ¡NN [GeV]
l(0)
= 2
dN ch
/dd
| d=0
/ N pa
rt
AA central collisionsLHC data
ALICEATLASCMS
RHIC AuAu dataBRAHMSPHENIX
PHOBOS STAR
SPS dataNA45NA49
AGS dataE802/917
GSI dataFOPI
hybrid fit: log(s) + power-lawpower-law fitlog(s) fit up to RHIC data
Energy dissipation model calculationfor AA centrality data at ¡NN
CMSPHOBOSSTAR
Fits to weighted LHC and RHIC dataLHC: ALICE, ATLAS, CMSRHIC: PHENIX, PHOBOS, STAR
hybrid fit: log(s) + power-lawpower-law fit
Prediction for AA at 3s<NN = 5.52 TeV
ET in Constituent Quark Framework ü Similar to the midrapidity
density ET measurements show independence of centrality as soon as recalculated in the constituent quark frame!
PHENIX Collab. (2014)!
Aditya Nath Mishra ISMD2014, Italy
Quark part.
!
R.Sahoo, A.N.M. (2014)!
9
Quark part.
Nucleon part.
ET in Constituent Quark Framework ü Similar to the midrapidity
density ET measurements show independence of centrality as soon as recalculated in the constituent quark frame!
PHENIX Collab. (2014)!
Aditya Nath Mishra ISMD2014, Italy
Quark part.
! !
R.Sahoo, A.N.M. (2014)!
9
Quark part.
Nucleon part.
ü Indicates an importance of constituent quark degrees of freedom, therefore the effective energy of participants deriving particle production!
0
2
4
6
8
10
12
14
16
1 10 10 2 10 3
3s<
NN , ¡NN [GeV]
l T(0) =
2 dE
T /dd|
d=0 / N
part [
GeV] AA central collisions
LHC dataCMS
RHIC dataPHENIXSTAR
SPS dataNA49WA98
AGS dataE802/917
GSI dataFOPI
hybrid fit: log(s) + power-lawpower-law fitlog(s) fit up to RHIC data (PHENIX)
Energy dissipation model calculationfor AA centrality data at ¡NN
CMSPHENIX
Fits to weighted CMS, PHENIX, STAR datahybrid fit: log(s) + power-lawpower-law fit
Prediction for AA at 3s<NN = 5.52 TeV
ü Centrality data are shown as a function of the effective c.m. energy εNN!
Transverse Energy Mid-rapidity Density
Aditya Nath Mishra ISMD2014, Italy 10
0
2
4
6
8
10
12
14
16
1 10 10 2 10 3
3s<
NN , ¡NN [GeV]
l T(0) =
2 dE
T /dd|
d=0 / N
part [
GeV] AA central collisions
LHC dataCMS
RHIC dataPHENIXSTAR
SPS dataNA49WA98
AGS dataE802/917
GSI dataFOPI
hybrid fit: log(s) + power-lawpower-law fitlog(s) fit up to RHIC data (PHENIX)
Energy dissipation model calculationfor AA centrality data at ¡NN
CMSPHENIX
Fits to weighted CMS, PHENIX, STAR datahybrid fit: log(s) + power-lawpower-law fit
Prediction for AA at 3s<NN = 5.52 TeV
ü Centrality data are shown as a function of the effective c.m. energy εNN!
!ü Centrality data follow well the
d a t a f r o m t h e c e n t r a l collisions.!
ü Hybrid fits are amazingly close to each other for the entire energy range.!
Transverse Energy Mid-rapidity Density
Aditya Nath Mishra ISMD2014, Italy 10
0
2
4
6
8
10
12
14
16
1 10 10 2 10 3
3s<
NN , ¡NN [GeV]
l T(0) =
2 dE
T /dd|
d=0 / N
part [
GeV] AA central collisions
LHC dataCMS
RHIC dataPHENIXSTAR
SPS dataNA49WA98
AGS dataE802/917
GSI dataFOPI
hybrid fit: log(s) + power-lawpower-law fitlog(s) fit up to RHIC data (PHENIX)
Energy dissipation model calculationfor AA centrality data at ¡NN
CMSPHENIX
Fits to weighted CMS, PHENIX, STAR datahybrid fit: log(s) + power-lawpower-law fit
Prediction for AA at 3s<NN = 5.52 TeV
ü Centrality data are shown as a function of the effective c.m. energy εNN!
!ü Centrality data follow well the
d a t a f r o m t h e c e n t r a l collisions.!
ü Hybrid fits are amazingly close to each other for the entire energy range.!
!Effective energy approach provides a good description of the ET production in heavy-ion collisions!
Transverse Energy Mid-rapidity Density
Aditya Nath Mishra ISMD2014, Italy 10
0
2
4
6
8
10
12
14
16
1 10 10 2 10 3
3s<
NN , ¡NN [GeV]
l T(0) =
2 dE
T /dd|
d=0 / N
part [
GeV] AA central collisions
LHC dataCMS
RHIC dataPHENIXSTAR
SPS dataNA49WA98
AGS dataE802/917
GSI dataFOPI
hybrid fit: log(s) + power-lawpower-law fitlog(s) fit up to RHIC data (PHENIX)
Energy dissipation model calculationfor AA centrality data at ¡NN
CMSPHENIX
Fits to weighted CMS, PHENIX, STAR datahybrid fit: log(s) + power-lawpower-law fit
Prediction for AA at 3s<NN = 5.52 TeV
ü Centrality data are shown as a function of the effective c.m. energy εNN!
!ü Centrality data follow well the
d a t a f r o m t h e c e n t r a l collisions.!
ü Hybrid fits are amazingly close to each other for the entire energy range.!
!Effective energy approach provides a good description of the ET production in heavy-ion collisions!
v LHC data depart from the linear-log in the region of √sNN ≃ 0.5 − 1.0 TeV!
v Possibly transition to a new r e g i m e i n h e a v y - i o n collisions!
Transverse Energy Mid-rapidity Density
Aditya Nath Mishra ISMD2014, Italy 10
0
2
4
6
8
10
12
14
16
1 10 10 2 10 3
3s<
NN , ¡NN [GeV]
l T(0) =
2 dE
T /dd|
d=0 / N
part [
GeV] AA central collisions
LHC dataCMS
RHIC dataPHENIXSTAR
SPS dataNA49WA98
AGS dataE802/917
GSI dataFOPI
hybrid fit: log(s) + power-lawpower-law fitlog(s) fit up to RHIC data (PHENIX)
Energy dissipation model calculationfor AA centrality data at ¡NN
CMSPHENIX
Fits to weighted CMS, PHENIX, STAR datahybrid fit: log(s) + power-lawpower-law fit
Prediction for AA at 3s<NN = 5.52 TeV
ü Centrality data are shown as a function of the effective c.m. energy εNN!
!ü Centrality data follow well the
d a t a f r o m t h e c e n t r a l collisions.!
ü Hybrid fits are amazingly close to each other for the entire energy range.!
!Effective energy approach provides a good description of the ET production in heavy-ion collisions!
v LHC data depart from the linear-log in the region of √sNN ≃ 0.5 − 1.0 TeV!
v Possibly transition to a new r e g i m e i n h e a v y - i o n collisions!
Transverse Energy Mid-rapidity Density
Aditya Nath Mishra ISMD2014, Italy 10
PredicYon for the transverse energy mid-‐rapidity density for Pb+Pb collisions at √sNN = 5.52 TeV is about 16.9 (within 10% uncertainty)
0
2
4
6
8
10
12
14
16
1 10 10 2 10 3
3s<
NN , ¡NN [GeV]
l T(0) =
2 dE
T /dd|
d=0 / N
part [
GeV] AA central collisions
LHC dataCMS
RHIC dataPHENIXSTAR
SPS dataNA49WA98
AGS dataE802/917
GSI dataFOPI
hybrid fit: log(s) + power-lawpower-law fitlog(s) fit up to RHIC data (PHENIX)
Energy dissipation model calculationfor AA centrality data at ¡NN
CMSPHENIX
Fits to weighted CMS, PHENIX, STAR datahybrid fit: log(s) + power-lawpower-law fit
Prediction for AA at 3s<NN = 5.52 TeV
ü Centrality data are shown as a function of the effective c.m. energy εNN!
!ü Centrality data follow well the
d a t a f r o m t h e c e n t r a l collisions.!
ü Hybrid fits are amazingly close to each other for the entire energy range.!
!Effective energy approach provides a good description of the ET production in heavy-ion collisions!
v LHC data depart from the linear-log in the region of √sNN ≃ 0.5 − 1.0 TeV!
v Possibly transition to a new r e g i m e i n h e a v y - i o n collisions!
Transverse Energy Mid-rapidity Density
Aditya Nath Mishra ISMD2014, Italy 10
PredicYon for the transverse energy mid-‐rapidity density for Pb+Pb collisions at √sNN = 5.52 TeV is about 16.9 (within 10% uncertainty)
2
4
6
8
10
12
14
1 10 10 2 10 3
3s<
NN , ¡NN [GeV]l(
0) =
2 d
Nch
/dd
| d=0
/ N
part
AA central collisionsLHC data
ALICEATLASCMS
RHIC AuAu dataBRAHMSPHENIX
PHOBOS STAR
SPS dataNA45NA49
AGS dataE802/917
GSI dataFOPI
hybrid fit: log(s) + power-lawpower-law fitlog(s) fit up to RHIC data
Energy dissipation model calculationfor AA centrality data at ¡NN
CMSPHOBOSSTAR
Fits to weighted LHC and RHIC dataLHC: ALICE, ATLAS, CMSRHIC: PHENIX, PHOBOS, STAR
hybrid fit: log(s) + power-lawpower-law fit
Prediction for AA at 3s<NN = 5.52 TeV
2
4
6
8
10
12
14
16
0 100 200 300 400Npart
l T(0
) = 2
dE T
/dd| d
=0 /N
part
[G
eV]
CMS 2.76 TeVPHENIX 200 GeV × 3.07PHENIX 200 GeVPHENIX 130 GeVPHENIX 62.4 GeVPHENIX 19.6 GeVEffective energy dissip. model
Effective energy dissip. modelprediction for 3s<NN = 5.52 TeVCMS 2.76 TeV × 1.59
ü LHC data shows faster decrease with centrality as compared to RHIC data (in contrast to midrapidity data)!
Transverse Energy Mid-rapidity Density
Aditya Nath Mishra ISMD2014, Italy 11
2
4
6
8
10
12
14
16
0 100 200 300 400Npart
l T(0
) = 2
dE T
/dd| d
=0 /N
part
[G
eV]
CMS 2.76 TeVPHENIX 200 GeV × 3.07PHENIX 200 GeVPHENIX 130 GeVPHENIX 62.4 GeVPHENIX 19.6 GeVEffective energy dissip. model
Effective energy dissip. modelprediction for 3s<NN = 5.52 TeVCMS 2.76 TeV × 1.59
ü LHC data shows faster decrease with centrality as compared to RHIC data (in contrast to midrapidity data)!
ü Effective energy approach very well explains the experimental data!
ü Agreement is even better than for the charge particle midrapidity density!
Transverse Energy Mid-rapidity Density
Aditya Nath Mishra ISMD2014, Italy 11
2
4
6
8
10
12
14
16
0 100 200 300 400Npart
l T(0
) = 2
dE T
/dd| d
=0 /N
part
[G
eV]
CMS 2.76 TeVPHENIX 200 GeV × 3.07PHENIX 200 GeVPHENIX 130 GeVPHENIX 62.4 GeVPHENIX 19.6 GeVEffective energy dissip. model
Effective energy dissip. modelprediction for 3s<NN = 5.52 TeVCMS 2.76 TeV × 1.59
ü LHC data shows faster decrease with centrality as compared to RHIC data (in contrast to midrapidity data)!
ü Effective energy approach very well explains the experimental data!
ü Agreement is even better than for the charge particle midrapidity density!
Transverse Energy Mid-rapidity Density
Aditya Nath Mishra ISMD2014, Italy 11
Predictions for the future heavy-ion collisions at √sNN = 5.52 TeV given!
Summary ü Centrality and c.m. energy dependence of bulk observables (charged
particle and transverse energy midrapidity density) are analyzed for all available energies!
ü Universality in particle production process is obtained based on the model considering dissipating energy available at the early stage of collision from interacting participants depending upon their type!
ü Bulk observables in heavy-ion collisions are well reproduced from those in pp collisions, treated within constituent quark model and Landau hydrodynamics!
ü Available measurements upto LHC energies agree well with the model expectations. A possible transition to a new regime at √sNN = 0.5 – 1.0 TeV is indicated, the measurements are welcome!
ü Prediction for the foreseen LHC energy at 5.52 TeV Pb+Pb collisions is made!Aditya Nath Mishra ISMD2014, Italy 12