Presentation is loading. Please wait.

Presentation is loading. Please wait.

Soft Physics at Forward Rapidity

Published byBerenice Greene Modified over 5 years ago

Similar presentations

Presentation on theme: "Soft Physics at Forward Rapidity"— Presentation transcript:

1 Soft Physics at Forward Rapidity
I.G. Bearden Niels Bohr Institute Københavns Universitet 6. April 2008 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute

2 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute
Outline Introduction BRAHMS experimental details K/p ratio Why is it interesting? How does it look vs. rapidity? vs. pbar/p? Stopping What is it? Why is it interesting? BRAHMS results +systematics Summary 6. April 2008 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute

3 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute
early universe QCD phase diagram quark gluon plasma SIS AGS SPS RHIC T TC~170 MeV crab nebula neutron stars temperature hadron gas Nuclear Matter baryon chemical potential mB 940 MeV 6. April 2008 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute

4 how can we probe the plasma?
e, pressure builds up System expands & cools g, g* e+e-, m+m- Real and virtual photons emitted as thermal radiation. Hard scattered partons, Heavy q’s probe plasma p, K, p, n, f, L, D, X, W, d, Hadrons reflect (thermal) properties when inelastic collisions stop (chemical freeze-out). 6. April 2008 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute

5 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute
The BRAHMS Experiment It’s Broad RAnge Hadron Magnetic Spectrometers! 90° 30° and 30° to 90° (MRS) Two small solid angle spectrometers (FS and MRS) 2.3° 30° that can rotate from 2.3° to 30° provide excellent PID over broad range in y-pT 6. April 2008 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute

6 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute
The BRAHMS experiment FS: TPC, TOF, Cherenkov deg.  = MRS: TPC, TOF deg = Global: || < 5 6. April 2008 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute

7 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute
A BRAHMS Event T2 D2 FFS at 6 degrees T1 D1 collision point (vertex) beam beam TPM1 D5 TPM2 Reconstructed tracks MRS at 90 degrees 6. April 2008 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute

8 Particle Identification
TIME-OF-FLIGHT RICH: Cherenkov light focused on spherical mirror ; ring on image plane Ring radius vs momentum gives PID p / K separation 20 GeV/c Proton ID up to 35 GeV/c CHERENKOV (2 settings) 6. April 2008 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute

9 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute
Particle Spectra After appropriate corrections, we combine all data sets to obtain final invariant yields over a broad range of rapidity and pT p K p 6. April 2008 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute

10 Particle Spectra (200 GeV Au+Au)
PRL 94, (2005) Top 5% central collisions Pions: power law Kaons: exponential Protons: Gaussian 6. April 2008 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute

11 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute
Outline Introduction BRAHMS experimental details K/p ratio Why is it interesting? How does it look vs. rapidity? vs. pbar/p? Stopping What is it? Why is it interesting? BRAHMS results +systematics Summary 6. April 2008 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute

12 Why look at ’low’ pT K and pi?
6. April 2008 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute

13 Pt spectra from 0-10% central Au+Au collisions
Pion spectra fitted with a power law at mid-rapidity and mt exponentials at forward rapidities. The kaon spectra fitted with mt exponentials at all rapidities. Quark Matter, 4-10 February, Jaipur, India

14 Anti-particle/particle ratios vs. rapidity
At y~0 pbar/p ~0.47 K⁻/K⁺ ~ 0.85 π⁻/π⁺ ~ 0.98 At y~3 pbar/p~0.02 !! K⁻/K⁺ ~ 0.6 π⁻/π⁺ ~ 1.1 Quark Matter, 4-10 February, Jaipur, India

15 K⁻/K⁺ vs baryo-chemical potential
The blue curve is a statistical model calculation with a chemical freez-out temperature fixed at 170 MeV but allowing the baryo-chemical potential to vary. I.G.Bearden et al., BRAHMS Collaboration, Phys.Rev.Lett. 90 (2003) F.Becattini et al., Phys.Rev. C64 (2001) Quark Matter, 4-10 February, Jaipur, India

16 K⁻/K⁺ vs baryo-chemical potential
pbar/p K⁻/K⁺ vs baryo-chemical potential The blue curve is a statistical model calculation with a chemical freez-out temperature fixed at 170 MeV but allowing the baryo-chemical potential to vary. I.G.Bearden et al., BRAHMS Collaboration, Phys.Rev.Lett. 90 (2003) F.Becattini et al., Phys.Rev. C64 (2001) Quark Matter, 4-10 February, Jaipur, India

17 Integrated dN/dy vs rapidity
UrQMD references: S.A.Bass et al., Prog.Part.Nucl.Phys.41 (1998) M.Bleicher, E.Zabrodin et al., J.Phys.G25 (1999) AMPT references: B.Zhang et al., Phys.Rev.C61 (2000) Z.-w. Lin et al., Nucl.Phys.A698 (2002) The dN/dy distributions were fitted with gaussian functions with fixed centroids at y=0. The different kaonic widths reflect their different production mechanisms. Quark Matter, 4-10 February, Jaipur, India

18 Quark Matter, 4-10 February, Jaipur, India
K/π ratios vs. Rapidity UrQMD and AMPT models fail to fit the K⁺/π⁺ ratio behaviour at forward rapidity. The negative ratio is reasonably explained. Quark Matter, 4-10 February, Jaipur, India

19 Quark Matter, 4-10 February, Jaipur, India
K/π vs pbar/p I.G.Bearden et al., BRAHMS Collaboration, Phys.Rev.Lett.94 (2005) I.Arsene et al., BRAHMS Collaboration, Nucl.Phys.A757 (2005) 1-27 Quark Matter, 4-10 February, Jaipur, India

20 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute
Outline Introduction BRAHMS experimental details K/p ratio Why is it interesting? How does it look vs. rapidity? vs. pbar/p? Stopping What is it? Why is it interesting? BRAHMS results +systematics Summary 6. April 2008 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute

21 Stopping or Transparency ?
Before collision After collision Stopping Transparency y dN/dy (p-pbar) yb δy y y 6. April 2008 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute

22 Stopping: where are the baryons?
6. April 2008 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute

23 What you can do with 100 times more data…
6. April 2008 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute

24 Stopping: where are the baryons?
6. April 2008 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute

25 Measure @ 62 A GeV: Protons and antiprotons
6. April 2008 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute

26 How many ’net’ protons :
BRAHMS preliminary 6. April 2008 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute

27 Rapidity loss: 6th order polynomial
Gaussians in pz: 2.03  0.16 2.00  0.10 6 order polynomial Total E=25.72.1TeV Rapidity loss: 22. Oktober 2004 Forward Physics Workshop, KU I.G.Bearden, Niels Bohr Institute

28 Systematics of stopping
6. April 2008 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute

29 Projectile net-baryons:
Subtract ”target” contribution (characterized by exp(-y)[p+p] exp(-y/2)[ZPhysC43(1989)241] 6. April 2008 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute

30 ’Net’ baryon vs. rapidity as a function of beam energy
AGS √snn=5 GeV SPS √snn=17 GeV RHIC √snn=62 GeV RHIC √snn=200 GeV LHC √snn=5500 GeV 6. April 2008 WNND08, South Padre Island I.G.Bearden, Niels Bohr Institute

Download ppt "Soft Physics at Forward Rapidity"

Similar presentations

Mass, Quark-number, Energy Dependence of v 2 and v 4 in Relativistic Nucleus- Nucleus Collisions Yan Lu University of Science and Technology of China Many.

Mass, Quark-number, Energy Dependence of v 2 and v 4 in Relativistic Nucleus- Nucleus Collisions Yan Lu University of Science and Technology of China Many.
Physics Results of the NA49 exp. on Nucleus – Nucleus Collisions at SPS Energies P. Christakoglou, A. Petridis, M. Vassiliou Athens University HEP2006,

Physics Results of the NA49 exp. on Nucleus – Nucleus Collisions at SPS Energies P. Christakoglou, A. Petridis, M. Vassiliou Athens University HEP2006,
Pawan Kumar NetrakantiPANIC-2005, Santa Fe1 Pion, proton and anti-proton transverse momentum spectra in p+p and d+Au collisions at  s NN = 200 GeV Outline:

Pawan Kumar NetrakantiPANIC-2005, Santa Fe1 Pion, proton and anti-proton transverse momentum spectra in p+p and d+Au collisions at  s NN = 200 GeV Outline:
K*(892) Resonance Production in Au+Au and Cu+Cu Collisions at  s NN = 200 GeV & 62.4 GeV Motivation Analysis and Results Summary 1 Sadhana Dash Institute.

K*(892) Resonance Production in Au+Au and Cu+Cu Collisions at  s NN = 200 GeV & 62.4 GeV Motivation Analysis and Results Summary 1 Sadhana Dash Institute.
Results from PHENIX on deuteron and anti- deuteron production in Au+Au collisions at RHIC Joakim Nystrand University of Bergen for the PHENIX Collaboration.

Results from PHENIX on deuteron and anti- deuteron production in Au+Au collisions at RHIC Joakim Nystrand University of Bergen for the PHENIX Collaboration.
A probe for hot & dense nuclear matter. Lake Louise Winter Institute 21 February, 2000 Manuel Calderón de la Barca Sánchez.

A probe for hot & dense nuclear matter. Lake Louise Winter Institute 21 February, 2000 Manuel Calderón de la Barca Sánchez.
Particle Production in p + p Reactions at GeV K. Hagel Cyclotron Institute Texas A & M University for the BRAHMS Collaboration.

Particle Production in p + p Reactions at GeV K. Hagel Cyclotron Institute Texas A & M University for the BRAHMS Collaboration.
Quark Matter 2008, Jaipur. Outline February 9, 2008Quark Matter 2008 2 Results –dN/dy –Stopping Results –dN/dy –Stopping Summary and discussion Experiment.

Quark Matter 2008, Jaipur. Outline February 9, 2008Quark Matter Results –dN/dy –Stopping Results –dN/dy –Stopping Summary and discussion Experiment.
5-12 April 2008 Winter Workshop on Nuclear Dynamics STAR Particle production at RHIC Aneta Iordanova for the STAR collaboration.

5-12 April 2008 Winter Workshop on Nuclear Dynamics STAR Particle production at RHIC Aneta Iordanova for the STAR collaboration.
12-17 February 2007 Winter Workshop on Nuclear Dynamics STAR identified particle measurements at large transverse momenta in Cu+Cu collisions at RHIC Richard.

12-17 February 2007 Winter Workshop on Nuclear Dynamics STAR identified particle measurements at large transverse momenta in Cu+Cu collisions at RHIC Richard.
Masashi Kaneta, LBNL Masashi Kaneta for the STAR collaboration Lawrence Berkeley National Lab. First results from STAR experiment at RHIC - Soft hadron.

Masashi Kaneta, LBNL Masashi Kaneta for the STAR collaboration Lawrence Berkeley National Lab. First results from STAR experiment at RHIC - Soft hadron.
QM2006 Shanghai, China 1 High-p T Identified Hadron Production in Au+Au and Cu+Cu Collisions at RHIC-PHENIX Masahiro Konno (Univ. of Tsukuba) for the PHENIX.

QM2006 Shanghai, China 1 High-p T Identified Hadron Production in Au+Au and Cu+Cu Collisions at RHIC-PHENIX Masahiro Konno (Univ. of Tsukuba) for the PHENIX.
HFT + TOF: Heavy Flavor Physics Yifei Zhang University of Science & Technology of China Lawrence Berkeley National Lab TOF Workshop, Hangzhou, 26-29 April,

HFT + TOF: Heavy Flavor Physics Yifei Zhang University of Science & Technology of China Lawrence Berkeley National Lab TOF Workshop, Hangzhou, April,
Spectra Physics at RHIC : Highlights from 200 GeV data Manuel Calderón de la Barca Sánchez ISMD ‘02, Alushta, Ukraine Sep 9, 2002.

Spectra Physics at RHIC : Highlights from 200 GeV data Manuel Calderón de la Barca Sánchez ISMD ‘02, Alushta, Ukraine Sep 9, 2002.
1 Identified particle production in the Beam Energy Scan from STAR Anthony Timmins for the STAR Collaboration  The Beam energy scan  The STAR experiment.

1 Identified particle production in the Beam Energy Scan from STAR Anthony Timmins for the STAR Collaboration  The Beam energy scan  The STAR experiment.
QM’05 Budapest, HungaryHiroshi Masui (Univ. of Tsukuba) 1 Anisotropic Flow in  s NN = 200 GeV Cu+Cu and Au+Au collisions at RHIC - PHENIX Hiroshi Masui.

QM’05 Budapest, HungaryHiroshi Masui (Univ. of Tsukuba) 1 Anisotropic Flow in  s NN = 200 GeV Cu+Cu and Au+Au collisions at RHIC - PHENIX Hiroshi Masui.
Single Electron Measurements at RHIC-PHENIX T. Hachiya Hiroshima University For the PHENIX Collaboration.

Single Electron Measurements at RHIC-PHENIX T. Hachiya Hiroshima University For the PHENIX Collaboration.
BNL/ Tatsuya CHUJO CNS workshop, Tokyo Univ. Identified Charged Single Particle Spectra at RHIC-PHENIX Tatsuya Chujo (BNL) for the PHENIX.

BNL/ Tatsuya CHUJO CNS workshop, Tokyo Univ. Identified Charged Single Particle Spectra at RHIC-PHENIX Tatsuya Chujo (BNL) for the PHENIX.
Detail study of the medium created in Au+Au collisions with high p T probes by the PHENIX experiment at RHIC Takao Sakaguchi Brookhaven National Laboratory.

Detail study of the medium created in Au+Au collisions with high p T probes by the PHENIX experiment at RHIC Takao Sakaguchi Brookhaven National Laboratory.
1 SSA in BRAHMS J.H. Lee (BNL) for BRAHMS Collaboration Preliminary Results on ,K,p Transverse Single Spin Asymmetries  at 200 GeV and 62 GeV  at high-x.

1 SSA in BRAHMS J.H. Lee (BNL) for BRAHMS Collaboration Preliminary Results on ,K,p Transverse Single Spin Asymmetries  at 200 GeV and 62 GeV  at high-x.

Similar presentations

Ads by Google