Direct Photon HBT and future perspectives for dileptons in STAR Evan Finch-Yale University RHIC-AGS Users’ Meeting 2008.

Slides:

Advertisements

Similar presentations

Yorito Yamaguchi For the PHENIX collaboration CNS, University of Tokyo 10/14/2008ATHIC2008 1/13.

Advertisements

Results from PHENIX on deuteron and anti- deuteron production in Au+Au collisions at RHIC Joakim Nystrand University of Bergen for the PHENIX Collaboration.

Di-electron Continuum at PHENIX Yorito Yamaguchi for the PHENIX collaboration CNS, University of Tokyo Rencontres de Moriond - QCD and High Energy Interactions.

Direct virtual photon production in Au+Au collision at 200 GeV at STAR Bingchu Huang for the STAR collaboration Brookhaven National Laboratory Aug

Bingchu Huang, USTC/BNL 1 Bingchu Huang (for STAR Collaboration) University of Science and Technology of China (USTC) Brookhaven National Laboratory (BNL)

ICPAQGP, Kolkata, February 2-6, 2015 Itzhak Tserruya PHENIX highlights.

Cold Nuclear Matter Effects on Open Heavy Flavor at RHIC J. Matthew Durham for the PHENIX Collaboration Stony Brook University

4/1/2010MRPC workshop at USTC, Lijuan Ruan (BNL)1 STAR di-lepton measurements Outline: Motivation and Introduction Results from 200 GeV p+p collisions.

January 12, 2007J. Sandweiss Two Important Long Range Programs for RHIC In addition to the many important RHIC research programs that are currently underway.

Direct-Photon Production in PHENIX Oliver Zaudtke for the Collaboration Winter Workshop on Nuclear Dynamics 2006.

1 The CMS Heavy Ion Program Michael Murray Kansas.

Search for Thermal Photons in PHENIX - Torsten Dahms - Stony Brook University 23 rd Winter Workshop On Nuclear Dynamics February 13, 2007.

ALICE EMCal Physics and Functional Requirements Overview.

Formation and decay of resonances Motivation Formation time Resonance Correlation Summary and Future Plans Motivation Formation time Resonance Correlation.

Sourav Tarafdar Banaras Hindu University For the PHENIX Collaboration Hard Probes 2012 Measurement of electrons from Heavy Quarks at PHENIX.

1 The Study of D and B Meson Semi- leptonic Decay Contributions to the Non-photonic Electrons Xiaoyan Lin CCNU, China/UCLA for the STAR Collaboration 22.

Feb High-pT Physics at Prague1 T. Horaguchi Hiroshima University Feb. 4 for the 4 th International Workshop.

JSPS Research Fellow / University of Tsukuba T. Horaguchi Oct for HAWAII /10/15HAWAII

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

Sevil Salur for STAR Collaboration, Yale University WHAT IS A PENTAQUARK? STAR at RHIC, BNL measures charged particles via Time Projection Chamber. Due.

PHENIX Fig1. Phase diagram Subtracted background Subtracted background Red point : foreground Blue point : background Low-mass vector mesons (ω,ρ,φ) ～

I. Ravinovich Di-electron measurements with the Hadron Blind Detector in the PHENIX experiment at RHIC Ilia Ravinovich for the PHENIX Collaboration Weizmann.

Identified Particle Ratios at large p T in Au+Au collisions at  s NN = 200 GeV Matthew A. C. Lamont for the STAR Collaboration - Talk Outline - Physics.

HFT + TOF: Heavy Flavor Physics Yifei Zhang University of Science & Technology of China Lawrence Berkeley National Lab TOF Workshop, Hangzhou, April,

Single Electron Measurements at RHIC-PHENIX T. Hachiya Hiroshima University For the PHENIX Collaboration.

D 0 Measurement in Cu+Cu Collisions at √s=200GeV at STAR using the Silicon Inner Tracker (SVT+SSD) Sarah LaPointe Wayne State University For the STAR Collaboration.

 production in p+p and Au+Au collisions in STAR Debasish Das UC Davis (For the STAR Collaboration)‏

ENHANCED DIRECT PHOTON PRODUCTION IN 200 GEV AU+AU IN PHENIX Stefan Bathe for PHENIX, WWND 2009.

April 30, 2005J. Sandweiss RHIC II EM Probes Direct Gammas and HBT Direct photons from the collision are an important, and different, signal carrying information.

Heavy flavor production at RHIC Yonsei Univ. Y. Kwon.

J/Ψ PRODUCTION IN A+A COLLISIONS AT STAR Ota Kukral for the STAR Collaboration Czech Technical University in Prague RHIC & AGS Annual Users’ Meeting 17.

Victor Ryabov (PNPI) for the PHENIX Collaboration QM2005 Budapest Aug,06, First measurement of the  - meson production with PHENIX experiment at.

1 STAR Open Heavy Flavor Measurements Gang Wang (UCLA) 1  Motivation  D 0 / D s / D*  Non-photonic electron  Summary.

HFT-prototype BUR considerations for Run-13 The main goal of the HFT engineering run will be system verification and correction; this includes the study.

Enhanced production of direct photons in Au+Au collisions at =200 GeV Y. Akiba (RIKEN/RBRC) for PHENIX Collaboration

STAR Electro-magnetic Physics Status and Future Aspect Guoji Lin (Yale) For STAR Collaboration RHIC & AGS Users’ Meeting, BNL, June 5-9.

Measurement of J/  -> e + e - and  C -> J/  +   in dAu collisions at PHENIX/RHIC A. Lebedev, ISU 1 Fall 2003 DNP Meeting Alexandre Lebedev, Iowa State.

Measurement of D-meson azimuthal anisotropy in Au+Au 200GeV collisions at RHIC Michael R. Lomnitz Kent State University Lawrence Berkeley National Laboratory.

03/13/2012Moriond QCD and High Energy Interactions, Mar Di-lepton production at STAR Outline: Motivation and Introduction Recent results from STAR.

M. Muniruzzaman University of California Riverside For PHENIX Collaboration Reconstruction of  Mesons in K + K - Channel for Au-Au Collisions at  s NN.

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

Ralf Averbeck Stony Brook University Hot Quarks 2004 Taos, New Mexico, July 19-24, 2004 for the Collaboration Open Heavy Flavor Measurements with PHENIX.

Dilepton Radiation Measured in PHENIX probing the Strongly Interacting Matter Created at RHIC Y. Akiba (RIKEN Nishina Center) for PHENIX Collaboration.

Non-photonic electron production in p+p collisions at √s=200 GeV Xiaozhi Bai for the STAR collaboration Central China Normal University University of Illinois.

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

 Production and Suppression in Heavy Ion Collisions at STAR Anthony Kesich University of California, Davis STAR Collaboration February 5, 2013.

OPEN HEAVY FLAVORS 1. Heavy Flavor 2 Heavy quarks produced in the early stages of the collisions (high Q2)  effective probe of the high-density medium.

JPS/DNPY. Akiba Single Electron Spectra from Au+Au collisions at RHIC Y. Akiba (KEK) for PHENIX Collaboration.

Study dileptons (e + e - ) and direct photons fn MPD/NICA NICA Roundetable Workshop IV: Physics at NICA9-12 October In-medium properties of hadrons:

1 Guannan Xie Nuclear Modification Factor of D 0 Mesons in Au+Au Collisions at √s NN = 200 GeV Lawrence Berkeley National Laboratory University of Science.

X. DongAug , 2014 TPD RBRC Workshop, BNL Dielectron Mass Spectrum & Elliptic Flow at Au+Au 200 GeV Xin Dong Lawrence Berkeley National Laboratory.

Heavy Flavor Workshop, Beijing, China, ShinIchi Esumi, Univ. of Tsukuba1 Heavy flavor collective flow measurements at RHIC ShinIchi Esumi Univ.

D.Arkhipkin, Y. Zoulkarneeva, Workshop of European Research Group on Ultra relativistic Heavy Ion Physics March 9 th 2006 Transverse momentum and centrality.

High Density Matter and Searches for Huan Z. Huang Department of Physics and Astronomy University of California, Los Angeles The STAR Collaboration.

Outline Motivation The STAR/EMC detector Analysis procedure Results Final remarks.

24 Nov 2006 Kentaro MIKI University of Tsukuba “electron / photon flow” Elliptic flow measurement of direct photon in √s NN =200GeV Au+Au collisions at.

Measurement of photons via conversion pairs with the PHENIX experiment at RHIC - Torsten Dahms - State University of New York at Stony Brook for the PHENIX.

Mass states of light vector mesons are considered to be sensitive probes of partial chiral symmetry restoration theoretically expected in high energy and/or.

PHENIX dileptons Thomas K. Hemmick Stony Brook University.

Measurement of photons via conversion pairs with the PHENIX experiment at RHIC - Torsten Dahms - Master of Arts – Thesis Defense Stony Brook University.

05/23/14Lijuan Ruan (BNL), Quark Matter The low and intermediate mass dilepton and photon results Outline: Introduction New results on dileptons.

SPHENIX Mid-rapidity extensions: Additional Tracking system and pre-shower Y. Akiba (RIKEN/RBRC) sPHENIX workfest July 29,

J. Zhao Hard Probe 2012, Cagliari 1, Lawrence Berkeley National Lab, USA 2, Shanghai Institution of Applied Physics, CAS, China Di-electron Production.

Non-Prompt J/ψ Measurements at STAR Zaochen Ye for the STAR Collaboration University of Illinois at Chicago The STAR Collaboration:

Fall DNP Meeting,  meson production in Au-Au and d-Au collision at \ /s NN = 200 GeV Dipali Pal Vanderbilt University (for the PHENIX collaboration)

Ilia Ravinovich for the PHENIX Collaboration

Richard Petti For the PHENIX Collaboration

Monika Sharma Wayne State University for the STAR Collaboration

Tatia Engelmore, Columbia University

The Study of Elliptic Flow for PID Hadron at RHIC-PHENIX

Presentation transcript:

Direct Photon HBT and future perspectives for dileptons in STAR Evan Finch-Yale University RHIC-AGS Users’ Meeting 2008

Direct Photon HBT: The Basics Direct Photons: probe all stages of collision and are sensitive to temperature evolution (though not trivially), but are swamped at low p T by (mostly π 0 ) decay photons. HBT: measurable correlations will exist only between direct photons (decay photon source is ~10 7 times larger) and are sensitive to source size evolution.  “The Dream”: d.o.f.  ε / T 4 But, a measurement is very challenging Statistically λ≈½(N γdirect / N γdecay ) 2 ~10 -3 and phase space considerations hurt as p T increases Systematically Without very good momentum resolution, π 0 peak can be hard to separate; other correlations to worry about

Calculations of radii vs. p T

D. Peressounko, PRC 67, (2003) T. Renk, PRC 71, (2005) D. K. Srivastava, PRC 67, (2005) Comparison of different models’ radii evolution versus p T

Curious γ correlations at RHIC… STAR Au-Au (200 GeV) with TPC-EMC (G. Lin) STAR Au-Au (62 GeV) with EMC-EMC (D. Das) PHENIX (200GeV/c) D. Peressounko

Adding a (retractable) 0.1 radiation length cylinder of lead at r~42 cm (just inside the TPC inner field cage) to increase the number of photon conversions. A 1-week ‘test’ run in this configuration may give an initial (1-D) measurement of low-p T photon HBT. It would also give improved low-p T measurements of π 0, η, and help understand these previous measurements. Assuming the test run is successful, we would plan to follow with a longer run to push the measurement higher in p T. Under Consideration by STAR

Simple model to estimate sensitivity We assume this temperature evolution with time. Every piece of matter emits photons with Boltzmann p T spectrum corresponding to temperature at its proper time. Longitudinal Bjorken expansion. There is no transverse expansion (for simplicity). Also add π 0 background, noise in calorimeter, realistic tracking efficiencies for converter photons.

Simple model to estimate sensitivity Radii vs. time in our simple model…

“Expected” Signal from 1 week test run Note: where are π 0 s?

Low-p T η measurement from converter ‘test’ run Importance: Large enhancement of low p T η,η’ possible depending on details of U A (1) restoration. We expect to be able to measure the η yield to roughly 20%, (η enhancement of order 1 is suggested by Kapusta et.al., PRD 53,5028 (1996)). From 20 million SIMULATED central events assuming ‘thermal’ production and with a pessimistic tracking quality assumption.

Pushing to higher pT… If the ‘test’ run is a success, we may proceed with a longer run with converter present. Of course, the data volume increases substantially with increased pT and this will prove challenging. Using these same rough assumptions, the events needed are… 3-D & pT < 300 MeV350 million events 3-D & (300 < pT < 600) MeV800 million events 3-D & pT > 600 MeV20 billion events Turbide et. al., PRC 69, (2004) D. d’Enterria and D. Peressounko, Eur Phys J. C46, 451 (2006)

Switching gears to dileptons…

STAR Time Of Flight Run 9: 50-75% coverage Run 10: full coverage

STAR e + e - with Time Of Flight With 50% TOF coverage, and using TPC to reject some dalitz daughters, we expect that signal/background around the φ mass will be ~1/20. This would imply a measurement of φ  ee good to 10% with about 60M events and a low mass dilepton measurement from the next AuAu run that is of similar significance to PHENIX run 4 results.

STAR Heavy Flavor Tracker For dileptons: HFT reduces background from γ conversions in material and heavy flavor decays. ~Run 12: partial ~Run 13: full

With HFT and TOF… HFT: ~Run 12: partial ~Run 13: full

Muon Telescope Detector π MTD p T (GeV) Muon Detection efficiency

Muon Telescope Detector pKπ Detection efficiency p T (GeV)

Summary Photon HBT measurements, if possible, are capable of giving a unique probe into the temperature, size development of collisions system. STAR is considering a 1-week ‘test’ run with a photon converter in the ‘near’ future to attempt an initial photon HBT measurement + other soft photon physics. For the next AuAu run, STAR will have partial TOF, and a first look a the low mass dilepton spectrum. With the HFT added, STAR will have excellent dilepton capabilities.