results from rhic. jens sören lange (frankfurt university / gsi darmstadt) xiii isvhecri, pylos,...
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![Page 1: Results from RHIC. Jens Sören Lange (Frankfurt University / GSI Darmstadt) XIII ISVHECRI, Pylos, Greece, 10.09.2004](https://reader030.vdocuments.site/reader030/viewer/2022032723/56649cfe5503460f949cedf9/html5/thumbnails/1.jpg)
Results from RHIC.
Jens Sören Lange (Frankfurt University / GSI Darmstadt)
XIII ISVHECRI, Pylos, Greece, 10.09.2004
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Jens Sören Lange Frankfurt Univ./GSI Results from RHIC XIII ISVHECRI 10.09.2004 2
Outline.
How extreme are the events ?categorization (measured properties) of RHIC Au+Au collisions
• temperature• size• energy density• matter density
and (as Gedankenexperiment) qualitative comparison to primordial universe, supernovae etc.
One specific example:
production of anti-protons, anti-deuterons and anti-Helium
in A+A collisions.
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Jens Sören Lange Frankfurt Univ./GSI Results from RHIC XIII ISVHECRI 10.09.2004 3
Timeline of 1 Au+Au Collision.
t~ 0 fm/c gold nuclei Lorentz contracted in laboratory frame“pancakes”hard parton scattering (quarks, gluons)
t~ 1 fm/c hot cylindert~ 4 fm/c soft partons from energy at (0,0,0)
beam remnants peaked forward/backwardt~10 fm/c freezeout: all partons particles
time scale 1 fm/c ~ 10-24 suniverse: cosmic inflation started @ t~10-34 s system already had macroscopic size.
QM (xp<h) formally induces v>c
Partonic stage Hadronic stage
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Jens Sören Lange Frankfurt Univ./GSI Results from RHIC XIII ISVHECRI 10.09.2004 4
=3.8 km1740 superconducting magnets
New York
RHIC
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Jens Sören Lange Frankfurt Univ./GSI Results from RHIC XIII ISVHECRI 10.09.2004 5
The Experiments.
LeptonsEmCal e forward/backward
silicon detector, high granularity,small in-plane acceptance
TPC large acceptance,realtime trackfinder
movable spectrometer,small forward acceptance
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ZDC
Barrel EMC
Endcap EMC
Magnet B= 0.5 T
ZDC
FTPCs
Vertex Position Scintillators (TOF)
Trigger Barrel(TOF)
Time Projection Chamber
Silicon Vertex Tracker
RICH
2 m
4 m
The STAR Experiment
24 sectors x 5692 r pads x 350 t bins= 47,812,800 pixels
y1
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Laser for TPC Calibration.
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Au+Au Collision s=200 GeV. Cosmic Ray Collision in STAR.
~6500 tracks, ~130,000 clusters.
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TPC dE/dx
dE/dx resolution on Level-3 Trigger ~11% (offline ~8%)
if charge < 0 anti-matter
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Data Set.
Au+Au 130 GeV 0.7 Mill. 2000 Au+Au 200 GeV 3.2 Mill. 2001 Au+Au 19.6 GeV ~20k 2001 d+Au 200 GeV 35 Mill. 2003 pp
• un-polarized• vertical pol. > 10 Mill.• longitudinal pol. > 10 Mill. (spin flip snake)
Level-3 trigger for rare probes• Upsilon• Anti-He
2004 Au+Au 200 GeV 47.5 Mill.
30.4 Mill. centralAu+Au 62 GeV 13.3 Mill.~63 x data (BELLE+BABAR) asym !
jet
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An obvious difference: topology.
Au+Au 3-dim, cylinder, infinite in z (if boost-invariant = true for ||0.5)
Universe 4-dim, infinite 3-dim all directions
Note: in the universe, a blast wave could not escape (closed).
general relativity curvatureds2~dr2/(1-k)k = 2GM/Rc2 k = 1 black hole (escape velocity c)k ~ 10-22 @ RHIC not bending space-time
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The phase diagram before RHIC.
B ~ NBaryon-NAnti-Baryon B ~ Nsea/Nvalence
Primordial Universe
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Where is the critical point ?
phase boundaryAllton et al.hep-lat/0204010
Tc=1603.5 MeVmb=72535 MeV=0.3-1.3 GeV/fm3
RHIC and universe: not near the critical point.no dramatic Ncharged event-by-event fluctuations expected.
hep-lat/0106002
Lattice QCD
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The Temperature.
2 methods:
• T from particle yield (ratios) e.g. for hadron resonance ideal gas Ni ~ mi T This is "chemical" T~200 MeV (start of scattering phase).
• T from inverse slope of exponential fits to mT
This is "kinetic" T~100 MeV (end of scattering phase).
T
mA
dm
dN
mT
TT
exp1 22 mpm TT
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The baryo-chemical potential B.
energy required to add 1 nucleon to the system_p / p ratio = 0.790.003(stat) 0.005(syst) = q
-6
q=exp(q/T) b=3q~30 MeV
insert T
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RHIC chemical freeze-out temperature: T=176 MeV (130 GeV), T=177 MeV (200 GeV)
B=41 MeV (130 GeV)B=29 MeV (200 GeV)
RHIC 200 GeVRHIC 130 GeV
T=2.1·1012 K
Universe:TPlanck=1.4·1034 Kbut maybe Hagedorn-limited ~1/Rn
Primordial Universe RHIC
All cosmological estimates fromK. A. Olive, hep-ph/9404352and references therein
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The Temperature (cont'd).
RHIC T=2.1·1012 KSun (core) 15.6·106 K
Supernova ~109 KPlasma fusion 55·106 KLaser fusion 4·106 K
One of the highest temperatures in the universe. Only small black holes are hotter: R=2GM/c2, kT=hc/4R
T(R=1 fm, M=1012 kg) ~ 1011 K
• Note: from s=130 GeV to s=200 GeV Although initial collision energy is increased by E=70 GeV,temperature increases only by 7 MeV10–4 of E
• RHIC and primordial universe have about the same distanceto the critical point
_
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p p
mT Distributions
K0s
0.2 < pT < 2.4
STAR Preliminary
MT-M0 (GeV/c2)
Statistical error only
Central events
(top 14%)
K*0
K- (K++ K-)/2, KoK+
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pT in p+p (s=200 GeV)
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pT in Au+Au (s=200 GeV), different from p+p !
BRAHMS: 10% centralPHOBOS: 10%PHENIX: 5%STAR: 5%
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Au+Au is not a pure superposition of p+p.
Mean pT for all charged particles
p+p <pT>=0.390 GeV/cAu+Au central <pT>=0.508 GeV/c
increase by ~30%.
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Hanbury-Brown-Twiss (HBT) Interferometry pairs (bosons Bose-Einstein statistics) close in p
Universe: R(galaxy) by difference in arrival time
RHIC collisions: difference in momentum p Fourier Transform p x Correlation Function C(p)=1+ x FourierTransform[(p)]=1+ exp(- p2R2) ( for resonances)
expanding system is time-dependant R=R(t)
The Size.
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Expanding Volume.
R(LONG)
R(SIDE)
R(OUT)
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HBT Radii vs. s
World compilation + STAR
• Surprising: Size roughly same AGS = SPS = RHIC R<10 fm• changes with beam energy negligible <0.5 fm • R increase with centrality (~ overlap region) O.K.• Unexpected: Rout/Rside ~ 1
• short “freeze-out”
• explosive source
PRL87(2001) 082301
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Rout/Rside1: Expanding Shell (“blast wave”)
R(LONG)
R(SIDE)
R(OUT)
Universe:at T~100 MeV horizon distance L~10 kmexpansion rate slower ~1019 (= 1/M2
Planck)
high wave front velocityv~(0.550.06)c
supernova SN1987av=(0.80+0.31-0.17)c(see talk DeRujula)
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The Quark/Gluon Density @ t=0.
Initial and final entropy must be sameThus Ngluons (partonic stage) = Npions (hadronic stage)we count Npions
we know Rassume cylinder, lorentz-invariant rapidity yt=0 =infinite, but @ t=0.2 fm/c: = 20/fm3 = 15 x [cold Au](hadrons definitely in-existent)
What is the energy density ?we have average momentum <p>90% , so assume m, then E2=m2+p2
~ 5 GeV/fm3 = 30 x [cold Au]
better pQCD estimate: ~18 GeV/fm3 Phys. Lett. B 507(01)121 SPS ~3 GeV/fm3, predictions before RHIC start up to 30 GeV/fm3
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The Matter Density.
Gold nuclear density o 2·1017 kg/m3 ~1 nucleon/fm3
RHIC ~ 15 x o
metallic hydrogen (Jupiter) ~1000 kg/m3 protons in e- seaGold atomic density (solid) ~20000 kg/m3
universe critical density 1.1·10-26 kg/m3 ~6 H atoms/m3
At RHIC density 15xo, universe was in inflationassume initial inflation mass m=25 g const. / R=10-40 1 mat start t~10-34 10118 o
at end t~10-36 10-19 o
In cosmology w/o inflation, R(asymptotic t0)~10-5 m.
in order to reach RHIC density, one must put m=3600 kg gold into it.If initial mass was less, RHIC density was never achieved.
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Total collision energy at RHIC.
1 Au+Au centrals=200 GeV x 197 primary pp/nn collisions 40 TeV 6 Jouletechnically human ear sensitivity starts at 10-18 Joulebut: not all energy goes into sound (instead temperature, kinetic energy etc.)
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Production of anti-protons,
anti-deuterons andanti-Helium
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Anti-Matter in the Universe.
~24% of all primordial matter is He creation at t~1 s, T~0.1 MeV Where is the Anti-He ? search for primordial Anti-p,d,He
by several experiments
e.g. BESS (balloon bound) H=2.7 km
e.g. AMS (space-shuttle bound) H=320-390 km
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Anti-Matter production at accelerators.
production by coalescenceZ anti-protons + N anti-neutronsoverlap wave functions(x and p small)
BA is a penalty factorfor adding one anti-nucleon
B2~10-3
(anti-deuteron)
B3~10-6
(anti-3He, anti-triton)
Pcoas~50-200 MeV
astro-physicists prefer:
nuclear physicists prefer:
conversion formula:
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Incident energy spectrum at AMS orbit (= "beam")
RHIC s=200 GeV
RHIC s=130 GeV
from J. A. Simpson,Ann. Rev. Nucl. Part. Sci. 33 (1983) 33
AMS relative abundance estimate:~80% p+~20% He~0.5% heavier~2% e+~0.5% e-
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AMS-01 anti-proton calibration data set.
MIR used as production "target" for anti-matter
Z=-1 tracks
MIR, ~4 daysno MIR, ~6 days
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7 models
AMS-02 motivation as reported on ICHEP 2004AMS-02 motivation as reported on ICHEP 2004anti-protonsanti-protons
expected anti-p distribution at AMS-02 orbit (ISS)
anti-p from neutralino annihilation
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background rejection: p/anti-p > 106
e-/anti-p ~103-104
AMS-02 estimate as reported on ICHEP 2004:AMS-02 estimate as reported on ICHEP 2004:3 years orbit, envisaged start 09/2007 3 years orbit, envisaged start 09/2007 anti-protonsanti-protons
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AMS-02 estimate as reported on ICHEP 2004: AMS-02 estimate as reported on ICHEP 2004: anti-deuterons vs. anti-protonsanti-deuterons vs. anti-protons
For T<1 GeV anti-d as SUSY signal possibly more promising:• "normal" anti-d production kinematically supressed in spallation• coalescence (one needs one anti-p and one anti-n close in phasespace)
RHIC anti-d
RHIC anti-HeN(SUSY)/N(Background)
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AMS-01 results.
10 days mission, ~99 Mill. reconstructed events~100 anti-p, no anti-d, no anti-He
negative chargepositive charge
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Anti-deuterons and Anti-Helium at RHIC.
Note: also at RHIC no anti-matter in initial state.
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anti-d
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10-3
10-6
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Anti-deuterons at H1/HERA.
hep-ex/0403056 p collisions at s=200 GeV (= same s as RHIC)
(e+/p 27.6/820 GeV collisions, but require scattered e+) N=45 anti-d candidates
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Anti-deuteron B2 compilation.
referencepp, s= 53 GeVPcoas=67 MeVastro-ph/9705110
+6– 8
it means:anti-d productionis suppressedAu+Au vs. p+p
~factor 40
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Why is B2 for A+A (thus) low ?
Is annihilation cross section changed in-medium ? but p+A AGS eperiments saw anti-p yield excess vs. p+p
E802, E878, E902nucl-ex/0107013p+Be, p+Cu, p+Aupbeam=12.3, 17.5 GeV/c
2 possible explanations given
• anti-p annihilation cross section is same as free but anti-p formation time extended (e.g. p+anti-p molecule) ~1 fm/c 4.9+-0.5 fm/c• anti-p annihilation cross section is reduced in-medium by almost a factor ~10
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Keep in mind: There is another source of Anti-deuterons.
Decay of Upsilon(1S),(2S) in e+e- collisions at s=10 GeV ARGUS Phys. Lett. B157(1985)326 one of the most non-perturbative known processes ever:
a b quark fragments into a nucleus Rare BR~6·10-5
not confirmed by OPAL at s=200 GeV e+e-Z. Phys. C67(1995)2003
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UNILACSIS
FRS
ESR
SIS 100/300
HESRSuperFRS
NESR
CR
RESR
GSI Darmstadt Future UpgradeFAIR - Facility for Antiproton and Ion Research
100 m
© J. Reiß (GSI)
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The "new" view of the phase diagram.
M. Bleicher et al. (Frankfurt UrQMD group) new lattice results (non-zero quark masses) critical point at lower B~450 MeV closed symbols: equilibrium open symbols: non-equilibrium
GSI Upgrade
RHIC
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Summary
Maybe trivial, but important:at ultra-relativistic energies, A+A is not a simple superposition of p+p(<pT> increased by ~30%).
RHIC increased anti-nuclei world data set significantly • N=6416 anti-deuterons • N=193 anti-3He• from 2004 data we expect N=2.70.3 anti-4He (would be first observation) • for first time anti-He pT spectrum and temperature• coalescence is ~factor 10 weaker than pp or p• coalescence decrease as f(s) in A+A confirmed (in p+p const.)
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Summary
Maybe trivial, but important:at ultra-relativistic energies, A+A is not a simple superposition of p+p(<pT> increased by ~30%).
RHIC increased anti-nuclei world data set significantly • N=6416 anti-deuterons • N=193 anti-3He• from 2004 data we expect N=2.70.3 anti-4He (would be first observation) • for first time anti-He pT spectrum and temperature• coalescence is ~factor 10 weaker than pp or p• coalescence decrease as f(s) in A+A confirmed (in p+p const.)
Final note:As an experimental site, Pylos is much nicer than Brookhaven.(Thanks very much for the invitation !)
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Additional slides for discussion
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System time evolution.
RHIC = strong interaction only,universe = strong, weak and EM (e.g. neutrino re-heating)
RHIC is matter dominated all the time, universe not.
This leads to different time evolutions of the temperature. Au+Au collision, after equilibrium.
E/N~T N/V~T3~1/t
T~1/t1/3
compare to cosmological, primordial phase
T~1/t1/2 for radiation dominated universe T~1/t2/3 for matter dominated universe
turnover at T~1 eV In either case, universe cool-down (somewhat) slower.
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MC for secondary anti-proton flux in atmosphere.
Huang et al., astro-ph/0305367, 0305369Cascade, 3-dim, incident p,He at H=2000 kmFor anti-protons, annihilation is only inelastic channel (~10%).
solid: 38 km, dashed: 380 km
trapped
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Anti-proton (trapped) trajectories.
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09/03/20004:43 am ESTrun #1247009event #10243
p1=5.099 GeV/cp2=5.458 GeV/c
m=10.457 GeV
Au+AusNN=130 GeV
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Upsilon->l+l- candidates
Run 2241022 Event #4699m=10.21 GeV
Run 2243027 Event #1645m=9.68 GeV
Run 2244029 Event#1570 m=9.25 GeV
+ - candidate
Run 2244032 Event #3420m=9.38 GeV
dE/dx<1.4e-5 keV/cmPPID(lepton)<3% Drell-Yan candidate
Run 2252020 Event #8718m=10.02 GeV
= 78oAu+AusNN=200 GeV
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Upsilon projection for 2004 data.
PYTHIA 6.2, k=3.0, =0.9, TPC slow simulator (e- cloud for dE/dx),identical recon. as real data, background: real +- data,EMC hadron suppression 1/200 @ lepton=90%,
L0 trigger enhancement 12.1, stat. and syst. errors shown
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Hadron resonance ideal gas
Compare particle ratios to experimental data
Qi : 1 for u and d, -1 for u and d
si : 1 for s, -1 for s
gi : spin-isospin freedom
mi : particle mass
Particle density of each particle
All resonances and unstable particles are decayed
Refs. J.Rafelski PLB(1991)333J.Sollfrank et al. PRC59(1999)1637
ch : Chemical freeze-out temperatureq : light-quark chemical potentials : strangeness chemical potentials : strangeness saturation factor
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Cosmological Timeline
Planck epoche 1019 GeV t~10-43 s Grand Unified Theory 1015 GeV t~10-35 s Electroweak phase transition 100 GeV t~10-11 s Quark-antiquark annihilation 1 GeV t~10-6 s Baryon freeze-out 200 MeV Neutrino freeze-out 1 MeV Nuclei (d,He,Li) freeze-out 0.1 MeV
t~1 s Matter-radiation equilibrium 1 eV Latest scatterings 5·105 yr