Analysis of Low Energy Pion Spectra

Slides:

Advertisements

Similar presentations

Anomalous Pion Production in High Energy Particle Collisions Alexander Bylinkin, Andrey Rostovtsev XV Moscow School of Physics XXXX ITEP Winter School.

Advertisements

Physics Results of the NA49 exp. on Nucleus – Nucleus Collisions at SPS Energies P. Christakoglou, A. Petridis, M. Vassiliou Athens University HEP2006,

Detailed HBT measurement with respect to Event plane and collision energy in Au+Au collisions Takafumi Niida for the PHENIX Collaboration University of.

Effects of Bulk Viscosity on p T -Spectra and Elliptic Flow Parameter Akihiko Monnai Department of Physics, The University of Tokyo, Japan Collaborator:

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.

In relativistic heavy ion collisions a high energy density matter Quark-Gluon Plasma (QGP) may be formed. Various signals have been proposed which probe.

1 Baryonic Resonance Why resonances and why  * ? How do we search for them ? What did we learn so far? What else can we do in the.

We distinguish two hadronization mechanisms:  Fragmentation Fragmentation builds on the idea of a single quark in the vacuum, it doesn’t consider many.

STAR Patricia Fachini QM20081 ρ 0 Production at High p T in Central Au+Au and p+p collisions at  s NN = 200 GeV in STAR STAR Patricia Fachini Brookhaven.

Enhancement of hadronic resonances in RHI collisions We explain the relatively high yield of charged Σ ± (1385) reported by STAR We show if we have initial.

5-12 April 2008 Winter Workshop on Nuclear Dynamics STAR Particle production at RHIC Aneta Iordanova for the STAR collaboration.

1. Introduction 2.     3.  p    n 4.     5.     A   A 6. Discussion 7. Summary Bosen Workshop 2007 Review on.

Particle Spectra at AGS, SPS and RHIC Dieter Röhrich Fysisk institutt, Universitetet i Bergen Similarities and differences Rapidity distributions –net.

Masashi Kaneta, LBNL Masashi Kaneta for the STAR collaboration Lawrence Berkeley National Lab. First results from STAR experiment at RHIC - Soft hadron.

Measurements of the Charge Balance Function at RHIC from √s NN = 7.7 to 200 GeV Gary D. Westfall, for the STAR Collaboration (Michigan State University)

Thermal Production of particles at RHIC (Test of Chemical Freeze-out at RHIC) Jun Takahashi for the STAR collaboration SQM2008, Beijing, China.

Spectra Physics at RHIC : Highlights from 200 GeV data Manuel Calderón de la Barca Sánchez ISMD ‘02, Alushta, Ukraine Sep 9, 2002.

S C O T T PRATTPRATT M I C H I G A N STATESTATE U N I V E R S I Y T S U N A M I THETHE B T PUZZLEPUZZLE ANDAND T H E R H I C.

BNL/ Tatsuya CHUJO CNS workshop, Tokyo Univ. Identified Charged Single Particle Spectra at RHIC-PHENIX Tatsuya Chujo (BNL) for the PHENIX.

STRING PERCOLATION AND THE GLASMA C.Pajares Dept Particle Physics and IGFAE University Santiago de Compostela CERN The first heavy ion collisions at the.

Matter System Size and Energy Dependence of Strangeness Production Sevil Salur Yale University for the STAR Collaboration.

Charmonium feasibility study F. Guber, E. Karpechev, A.Kurepin, A. Maevskaia Institute for Nuclear Research RAS, Moscow CBM collaboration meeting 11 February.

Self-similarity of hadron production in pp and AA collisions at high energies D.A. Artemenkov, G.I. Lykasov, A.I. Malakhov Joint Institute for Nuclear.

July 21, 2011M.Š. EPS-HEP 2011, Grenoble11 Three-dimensional Kaon Source Extraction from STAR Experiment at RHIC Michal Šumbera NPI ASCR Prague (for the.

EXPERIMENTAL EVIDENCE FOR HADRONIC DECONFINEMENT In p-p Collisions at 1.8 TeV * L. Gutay - 1 * Phys. Lett. B528(2002)43-48 (FNAL, E-735 Collaboration Purdue,

Light nuclei production in heavy-ion collisions at RHIC Md. Rihan Haque, for the STAR Collaboration Abstract Light nuclei (anti-nuclei) can be produced.

System size dependence of freeze-out properties at RHIC Quark Matter 2006 Shanghai-China Nov System size dependence of freeze-out properties.

Measurement of photons via conversion pairs with PHENIX at RHIC - Torsten Dahms - Stony Brook University HotQuarks 2006 – May 18, 2006.

Physics of Ultra-Peripheral Nuclear Collisions Melek YILMAZ ŞENGÜL Kadir Has University & İstanbul Technical University M.Cem GÜÇLÜ İstanbul Technical.

A Blast-wave Model with Two Freeze-outs Kang Seog Lee (Chonnam Nat’l Univ.)  Chemical and thermal analysis, done in a single model HIM

Masashi Kaneta, LBL Hadron Spectra in Au+Au Collisions by STAR Experiment at RHIC Masashi Kaneta for the STAR collaboration LBNL.

Two freeze-out model for the hadrons produced in the Relativistic Heavy-Ion Collisions. New Frontiers in QCD 28 Oct, 2011, Yonsei Univ., Seoul, Korea Suk.

Heavy-Ion Physics - Hydrodynamic Approach Introduction Hydrodynamic aspect Observables explained Recombination model Summary 전남대 이강석 HIM

School of Collective Dynamics in High-Energy CollisionsLevente Molnar, Purdue University 1 Effect of resonance decays on the extracted kinetic freeze-out.

Study of  ++ Resonance Abundance in 158 AGeV Pb + Pb Collisions at CERN-SPS CERN-SPS-WA98 Susumu SATO Susumu SATO Contents 1) Introduction ~ Relativistic.

Bulk properties of the system formed in Au+Au collisions at √s NN = 14.5 GeV using the STAR detector at RHIC Vipul Bairathi (for the STAR Collaboration)

Hyperon Polarization in Heavy ion Collisions C. C. Barros Jr. Universidade Federal de Santa Catarina Brasil Strangeness in Quark Matter 2013 University.

Andras. Ster, RMKI, Hungary ZIMANYI-SCHOOL’09, Budapest, 01/12/ Azimuthally Sensitive Buda-Lund Hydrodynamic Model and Fits to Spectra, Elliptic.

Blast-wave Model Calculation of v2 including Resonance Decays Kang Seog Lee, Suk Choi (Chonnam Nat’l Univ.) ATHIC 2012.

1 Space-time analysis of reactions at RHIC Fabrice Retière Lawrence Berkeley Lab STAR collaboration.

24 June 2007 Strangeness in Quark Matter 2007 STAR 2S0Q0M72S0Q0M7 Strangeness and bulk freeze- out properties at RHIC Aneta Iordanova.

Hadron Spectra and Yields Experimental Overview Julia Velkovska INT/RHIC Winter Workshop, Dec 13-15, 2002.

Energy Dependence of Soft Hadron Production Christoph Blume2nd International Workshop on the Critical Point and Onset of Deconfinement Bergen Mar. 30 -

1 Strange Resonance Production in p+p and Au+Au Collisions at RHIC energies. Christina Markert, Yale University for the STAR Collaboration QM2004,

Blast-wave fits with resonances to pt spectra from Pb+Pb collisions at √sNN = 2.76 TeV Ivan Meloa,b, Boris Tomášikb,c aŽilinská Univerzita, Žilina, Slovakia.

Freeze-out state from analysis of transverse momentum spectra in Pb+Pb collisions at 2.76 ATeV Ivan Meloa,c, Boris Tomášika,b aUniverzita Mateja Bela,

Monika Sharma Wayne State University for the STAR Collaboration

Hydro + Cascade Model at RHIC

Bulk viscosity in heavy ion collisions

Strange Probes of QCD Matter

Nuclear Effects in the Proton-Deuteron Drell-Yan Reaction.

Takafumi Niida from Univ. of Tsukuba for the PHENIX Collaborations

In search of K+K- molecule

Takafumi Niida from Univ. of Tsukuba for the PHENIX Collaborations

Effects of Bulk Viscosity at Freezeout

Outline First of all, there’s too much data!! BRAHMS PHOBOS PHENIX

ISMD ‘02, Alushta, Ukraine Sep 9, 2002

for the PHENIX collaboration

Effects of Bulk Viscosity on pT Spectra and Elliptic Flow Coefficients

Scaling Properties of Identified Hadron Transverse Momentum Spectra

Current status of Thermalization from available STAR results

20th International Conference on Nucleus Nucleus Collisions

Energy dependence of stopping

Kinematics 2: CM energy and Momentum

Meson Production reaction on the N* resonance region

Identified Charged Hadron Production

A Blast-wave Model with two Freeze-outs

Masahiro Konno (Univ. of Tsukuba) for the PHENIX　Collaboration Contact

Proposal for an Experiment: Photoproduction of Neutral Kaons on Deuterium Spokespersons: D. M. Manley (Kent State University) W. J. Briscoe (The George.

The initial and final temperatures in some high energy collisions

Presentation transcript:

Analysis of Low Energy Pion Spectra HIM Apr. 18, 2007 at Yonsei Univ. Suk Choi Prof.: Kang Seog Lee Chonnam National University

Purpose Low pt pion enhancement is either from D resonance contribution or Coulomb interaction. Near pion production threshold energy, pions are produced through D resonance. Charged pion spectra in Au+Au collision at 2, 4, 6, and 8 GeV/A by E895 Collaboration were analyzed by ellipsoidal Blastwave Model with resonance contribution & Coulomb Correction. p-/p+ is used as a fitting parameter to study beam energy dependence.

Lorentz-Transformed Boltzman distribution Spectrum is determined Blast-Wave Model Lorentz-Transformed Boltzman distribution Cooper-Frye Formula Thermal Spectrum Ellipsoidally expanding fireball model. Spectrum is determined by freeze-out values. Fit Parameters

Parameters is overall constant. Vp+ , Vp- each parameters are fitted. Herald Dobbler et al is overall constant. Vp+ , Vp- each parameters are fitted. is longitudinal rapidity. is transverse rapidity at (R0, z=0) Inside : linear transverse rapidity profile ellipsoidal expansion

Resonance contribution by J. Sollfrank Spectrum Calculation Coulomb Correction Resonance Contribution Thermal Spectrum N=118 ,Z=79 in Au+Au Resonance contribution by J. Sollfrank

is the unshifted invariant cross section Coulomb Correction is the unshifted invariant cross section

Fitted Values for each parameters 2 1.41 1.12 0.88 46 25 1.96 1.3 4 0.93 1.32 0.92 57 24 1.95 2.9 6 1.44 1.50 1.11 54 18 1.40 2.4 8 1.62 1.58 55 15 1.38 1.8

Transverse Mass Spectrum E895, Au+Au at 2 GeV/A mt - m0

Transverse Mass Spectrum E895, Au+Au at 8 GeV/A mt - m0

Rapidity Spectrum

for comparison Tch = 50MeV and mbch=850MeV at 1GeV/A Au+Au from particle ratio analysis Cleymans et al., Phys. Rev. C59, 1663(1999)

Conclusion Small freeze-out temperature with large expansion velocities are obtained and thus resonance contribution is negligible. Difference in the low momentum region of the two oppositely charged pions are due to the final state Coulomb interaction. Effect of Coulomb interaction decreases as beam energy increases. Near 2 GeV/A, p-/p+ is about 1.94. As energy increases the ratio decreases.