Parity group meetings

2010 meetings

September 22, 14:00-15:30 EST: EVO meeting information

• Some New Y7 Parity Results (Dhevan Gangadharan)
• Paper draft on charge separation (Dhevan Gangadharan)
• A Simple Simulation for Local Parity Violation Study (Gang Wang)
• Parity signal from Au+Au 39 GeV collisions (Gang Wang)
• Testing chiral magnetic effect with central U+U collisions (Sergei Voloshin)
• STAR Decadal Plan document on Local Parity Violation
• AOB

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2009 meetings

September 24, 14:00-15:30 EST; 510-486-7720

• PRL paper updates: PRL:v15
  
  • Referee reports
  • Response
  • New Figure: All versions (latest Jim's and Ilya's).
• ZDC-SMD vs. TPC comparison (Gang Wang)
• DPF 2009 proceedings (Ilya Selyuzhenkov)
• AOB?

September 10, 14:00-15:30 EST; 510-486-7720

• Update on ZDC-SMD study (Gang Wang)
• FYI: Submitted parity papers
• AOB?

September 03, 14:00-15:30 EST; 510-486-7720

• Paper drafts: PRL:v12, PRC:v30
  Collaboration comments:
  • Fuqiang Wang (Sergei's reply)
• FYI: Paper proposal on Excess charge correlations ... (Quan Wang, Fuqiang Wang)
  • PWG Convenor preview
  • Paul Sorensen comments
  • PWG Convenor recommendations and discussions
• AOB?

August 13, 14:00-15:30 EST; 510-486-7720

• Paper drafts: PRL:v10, PRC:v28
• Analysis updates:
  1. Parity violation with ZDC-SMDs (Gang Wang)
     (previous post: Jul-30-2009)
  2. Magnetic Field effect on events in HI collisions (Alexei Chikanian)
     (previous link: 2009_07_30.ppt)
• FYI: CPOD proceedings (Evan Finch)
• AOB?

July 23, 14:00-15:30 EST; 631-344-2261

• PRL paper draft Version 10 (updated)
  Reply to the Institution comments
• Thoughts on future... (Jack Sandweiss, All)
• FYI: updated DPF2009 presentation (Ilya Selyuzhenkov)
• AOB?

July 16, 14:00-15:30 EST; 631-344-2261

• PRL paper draft Version 10
  Reply to the Institution comments
• PRC paper draft:
  Comments by Fuqiang Wang
  Jack's e-mail
• Azimuthal correlations as a probe for local P-violation in HIC (Ilya Selyuzhenkov)
• Analysis updates:
  1. Study of a neutralization method (Ron Longacre)
• Feedback from the STAR analysis meeting at MIT:
  list of parity talks
• AOB?

June 18, 14:00-15:30 EST; 631-344-2261

• PRC paper draft Version 27
  Reply to the Collaboration comments
• PRL paper draft Version 8
• Analysis updates:
  1. HIJING in larger acceptance range, parityv-220 (Evan Finch/Alexei Chikanian)
  2. Results from Au+Au at 200 GeV: 2007 vs 2004 data (Alexei Chikanian)
• Feedback from CPOD workshop:
  • STAR Results on Local Strong P/CP violation at RHIC (Evan Finch)
• AOB?

June 04, 14:00-15:30 EST; 631-344-2261

• PRC paper draft Version 27
• PRL paper draft Version 7
  Updated Figure 3: <cos(a-b)> correlations
• Analysis updates:
  1. Delta Q projections (Dhevan Gangadharan)
• CPOD workshop:
  • STAR Results on Local Strong P/CP violation at RHIC (Evan Finch)
    Comments bulkcorr-332 (by Peter Filip)
    Question on Quark mass dependence (by Ahmed Hamed)
• (FYI) Talks given at RHIC & AGS user meeting:
  • STAR Results on Charge Separation Measurements (Jim Thomas)
  • Monte-Carlo Studies Related to Charge Separation Measurements (Evan Finch)
• AOB?

May 28, 14:00-15:30 EST; 631-344-2261

• PRC paper draft Version 26
  Updates/Collaboration comments:
  
  • New paper title
  • Panjab University comments
  • JINR comments
• PRL (short) paper draft Version 5
• Analysis updates:
  1. Connection between 3-particle correlator and DeltaQ widths (Dhevan Gangadharan)
  2. Increasing acceptance for HIJING (Alexei Chikanian)
• Upcoming talks at RHIC&AGS user meeting and CPOD workshop:
  • CPOD talk (Evan Finch)
  • AGS talk (Jim Thomas)
• AOB?

May 21, 14:00-15:30 EST; 631-344-2261

• PRC paper draft Version 26
  Collaboration comments:
  
  • Lanny Ray (reply by Evan Finch)
  • Fuqiang Wang (reply by Ilya Selyuzhenkov)
• PRL (short) paper draft Version 3
• Analysis updates:
  1. Comparison of < cos(phi_a-phi_b) > with simulated results (Sergei Voloshin)
  2. Regions of Strongest Charge Separation (Dhevan Gangadharan)
  3. Parity violation in HIC: correlators at 62.4 and 200 GeV (Vitaly Okorokov)
• (FYI) Updates for paper proposal on
  Excess correlation of charge asymmetry (Fuqiang Wang, Quan Wang)
  • Presentation at Conveners meeting
  • Paper proposal discussions: jetcorr and bulkcorr lists
  • Relating Fuqiang to Sergei’s observable (Paul Sorensen)
    discussions at bulkcorr-315 and bulkcorr-317 list
• AOB?

May 14, 14:00-15:30 EST; 631-344-8261

• PRC paper draft Version 26
  Released for the Collaboration review.
  Five STAR institutes assigned to read the manuscript:
  • BNL (Jerome Lauret)
  • Panjab University (Madan Aggarwal)
  • Dubna (Richard Lednicky)
  • Argonne (Hal Spinka)
  • UIC (Russell Betts)
• PRL (short) paper draft Version 2
• Support document Version 19
• Analysis updates:
  1. 45 degree axis neutralization (Dhevan Gangadharan)
  2. Addition to the 2004 Au+Au & 2005 Cu+Cu analysis (Alexei Chikanian)
  3. Correlators: experiment vs theory (Vitaly Okorokov)
     Presentations: 05.08.2009, 03.20.2009, and 02.20.2009
• FYI (has been already presented for jetcorr/bulkcorr PWG):
  • Paper proposal on
    Excess correlation of charge asymmetry (Fuqiang Wang, Quan Wang)
    Discussions: jetcorr and bulkcorr
  • Clusters and up-down/left-right pv-asymmetry (Fuqiang Wang, Quan Wang)
• AOB?

April 30, 14:00-15:30 EST; 631-344-2261

• PRC paper draft Version 25
  Comments:
  1. Carl Gagliardi
  2. Spencer Klein
  3. Peter Seyboth
  4. Ilya Selyuzhenkov
• Analysis updates:
  1. Event mixing and Neutralization concerns (Dhevan Gangadharan)
• FYI:
  • Simulation status update at bulkcorr PWG on April 29 (Evan Finch)
  • Needed STAR speaker to report on P-violation results at Critical Point workshop
• AOB?

April 23, 14:00-15:30 EST; 631-344-2261

• PRC paper draft Version 24
  Comments:
  1. Dhevan Gangadharan
  2. Ilya Selyuzhenkov
• WWND2009 proceedings (Dhevan Gangadharan)
• Analysis updates:
  1. MC forced parity-odd signal and then Neutralized (Dhevan Gangadharan)
  2. HIJING with different input v2 (Alexei Chikanian)
  3. In/out-of-plane jets in HIJING (Ron Longacre)
  4. UrQMD 3-particle results (Evan Finch)
  5. HIJING, UrQMD results for Au+Au at 200 and 62GeV vs. Nch (Sergei Voloshin)
• Discussions:
  1. PHOBOS clusters
• AOB?

April 16, 14:00-15:30 EST; 631-344-2261

• PRC paper draft Version 23 (no update yet)
  
  1. New paper figure: signal vs. delta pt
  2. Naming convention: Spontaneous vs. local
  3. Order for the section on systematics study (Vitaly Okorokov)
• Analysis updates:
  1. HIJING 1/N_ch^2 scaling: Au+Au and Cu+Cu results (Evan/Sergei/Alexei)
  2. MC forced parity-odd signal and then Neutralized (Dhevan Gangadharan)
  3. HIJING with different input v2 (Alexei Chikanian)
  4. In/out-of-plane jets in HIJING (Ron Longacre)
• AOB?

April 9, 14:00-15:30 EST; 631-344-2261

• PRC paper draft Version 23
  
  1. Reorganizing the paper flow to fit with new systematic uncertainties (Sergei Voloshin)
• Support document Version 18
  
  1. Todo: include plots for the signal vs. pt_a-pt_b, eta_a+eta_b
• Analysis updates:
  1. Neutralization procedure (Dhevan Gangadharan)
  2. 3-particle correlations from HIJING: Au+Au and Cu+Cu results (Evan Finch)
  3. Parity like signal in HIJING, see also hyper-news post 181-1 (Alexei Chikanian)
• Speaker candidate for RHIC/AGS Workshop on "Parity Violation in QGP" (June 1st).
• Paper status and Critical Point and Onset of Deconfinement (CPOD) workshop (Paul Sorensen)
• FYI: QM2009 talks and posters (final versions):
  1. Plenary talk (Sergei Voloshin)
  2. Poster 1 (Evan Finch)
  3. Poster 2 (Ilya Selyuzhenkov)
• AOB?

March 19, 14:00-15:30 EST; 631-344-8261

• PRC paper draft Version 23
  Comments:
  1. Carl Gagliardi
  2. Spencer Klein
  3. Ilya Selyuzhenkov
  4. Statement on cluster contribution
• Support document Version 17
  Comments by Evan Finch
• QM2009 talks and posters:
  1. Plenary talk (abstract, Sergei Voloshin)
  2. Poster 1 (abstract, Evan Finch)
  3. Poster 2 (abstract, Ilya Selyuzhenkov)
  4. Parity highlight slides (Gang Wang)
     Comments by Ilya Selyuzhenkov
• The STAR Collaboration Meeting:
  Parity presentations at bulkcorr parallel session (Wednesday, 25 March 2009; 09:00 - 12:30)
• Analysis updates:
  1. A Study of Conical Regions, and Update on Multiplicity Fluctuations (Dhevan Gangadharan)
  2. The 3-particle correlator for HIJING (Evan Finch)
  3. v2 parent vs daughter (Alexei Chikanian)
  4. Improved results and writeup on cluster model, discussion at parity-hn:169 (Fuqiang Wang)
• AOB?

March 12, 14:00-15:30 EST; 631-344-2261

• PRC paper draft Version 22
  Comments:
  1. Ernst Sichtermann
  2. Ilya Selyuzhenkov
• PRL paper draft Version 1
  Comments from Lanny Ray
• Support document: Any updates need to be done? (latest Version 15)
• QM2009 talk and posters:
  Plenary talk (Sergei Voloshin)
  Poster 1 [in preparation], Abstract 1 (Evan Finch)
  Poster 2, Abstract 2 (Ilya Selyuzhenkov)
• Analysis updates:
  1. Multiplicity Fluctuations (Dhevan Gangadharan)
  2. Pi/K decay losses in TPC (Vasily Dzordzhadze)
  3. Analytical estimates of PV-signal from cluster model, discussion at parity-hn:147 (Fuqiang Wang)
  4. v2 at the minijet level in HIJING (Evan Finch / Alexei Chikanian)
• AOB?

March 5, 14:00-15:30 EST; 631-344-2261

• PRC paper draft Version 20 (21tmp)
  Comments:
  1. Spencer Klein
  2. Peter Seyboth
  Note: PRC/PRL links has been added to paper proposal page at drupal
• PRL paper draft Version 1
• Feedback from the GPC meeting on February 26, 2009
• Analysis updates:
  1. uRQMD for Cu+Cu 200GeV (Evan Finch)
  2. Cluster model study: ppt or pdf (Fuqiang Wang)
  3. MEVSIM simulations vs. Au+Au 200GeVd data: eta and phi distributions (Vasily Dzordzhadze)
• Other issues:
  1. Any updates need to be done for support document?
  2. FYI: Sergei will be giving a seminar at BNL on parity violation (March 26, 2009)
     Change dates for Sergei's QM2009-practice talks at the Collaboration meeting?
  3. QM talk and posters

February 26, 14:00-15:30 EST; 631-344-2261

• Paper draft Version 18
  
  1. New introduction and v16 [Yale edits] (Jack Sandweiss/Evan Finch)
  2. Comments on the paper draft:
     parity-hn posts 137 and 136 (Ilya Selyuzhenkov)
     Summary statement (Evan Finch)
     Editorial pass (Jim Thomas)
  3. Plotting results vs. "decreasing" centrality (Sergei Voloshin)
  Note: paper proposal page at drupal has been updated
• PRL draft (initial version), and PRL thoughts (Evan Finch)
• Feedback from the GPC meeting on February 19, 2009
• Analysis updates:
  1. 1/N centrality dependence: data vs. simulations (Alexei Chikanian)
  2. Simulating parity violating effects in a cluster model (Fuqiang Wang/Quan Wang)
     "Per event" summary table
     parityv-hn discussion: 181
  3. Magnetic field increase at small energies (Vitaly Okorokov)
     parityv-hn discussion: 130
     Alexei's sensitivity plot
  4. Event plane recentering (Vasily Dzordzhadze)
     X vs. Y plots, X-Y mean values, EP angle plots
• Other issues:
  1. Any updates needs to be done for support document?
  2. FYI: Sergei will be giving a seminar at BNL on parity violation (March 26, 2009)
     Change dates for Sergei's QM2009-practice talks at the Collaboration meeting?

February 19, 14:00-15:30 EST; 631-344-2261

• Paper draft Version 16
  Note: paper proposal page at drupal has been updated
• Support document Version 15
• Feedback from GPC meeting (February 12, 2009):
  GPC comments (summarized by Jack Sandweiss and Sergei Voloshin)
• Status of the PRL (short) paper draft?
• Analysis updates:
  • more MEVSIm: Results 2, Results 3, parityv-hn posts: 129, 127 (Evan Finch)
  • cos(phi1-phi2) comparison (Sergei Voloshin/Alexei Chikanian)
  • Sensitivity for Au+Au (Alexei Chikanian)
  • FTPC vs TPC results (Sergei Voloshin)
  • HIJING in 60-70% bin (b=12.3fm) (Evan Finch)
  • Event plane distribution for different centrality bins (Vasily Dzordzhadze)
• Other items:
  • FYI: QM2009 posters on parity violation study have been submitted:
    Poster 1 (Ilya Selyuzhenkov)
    Poster 2 (Evan Finch)

February 12, 14:00-15:30 EST; 631-344-2261

• QM2009 posters on parity violation (Evan Finch/Ilya Selyuzhenkov)
  Poster 1 & Poster 2
• Support document Version 14
• GPC status?
• True vs. reconstructed reaction plane in simulation? (Sergei/Ilya/Evan)
• Analysis updates:
  • Systematic uncertainties from v2{2}, v2{FTPC}, and v2{4} (Sergei Voloshin)
  • Identified charge pion results (Dhevan Gangadharan/Jim Thomas)
  • Varying input for MEVSIM simulations (Evan Finch)
  • Dhevan's vs. Sergei's comparison for "raw" 3-particle correlations (Dhevan Gangadharan)
  • dAu correlations: redone with explicit 3-particle loop (Dhevan Gangadharan)
  • Vasily's presentations from two weeks before:
    CP 012909, pt efficiency, pt study (Vasily Dzordzhadze)
• Other issues:
  • Please, copy your code into $CVSROOT/offline/paper/psn0475/ directory
    (so far have codes from Sergei, Ilya, Evan, Alexei, and Dhevan)

February 05, 14:00-15:30 EST; 631-344-2261

• Paper draft Version 15n:
  • Parity-hn post 107 (Sergei Voloshin)
  • Fig. 10 update: UrQMD points replace PbPb with AuAu (Evan Finch)
  • Paper proposal page has been updated
• Support document Version 13tmp
  • Simulations and jet contributions, parity-hn post 104 (Evan Finch)
  • Sergei vs. Dhevan comparison plots
• GPC status?
• QM2009 poster on parity violation
• Analysis updates:
  • More centrality bins and pt dependence from uRQMD? (Evan/Ilya/Sergei)
  • Results for AuAu@200, CuCu@200, and AuAu@20GeV (Alexei Chikanian)
  • MEVSIM results (Evan Finch)
  • dAu correlations: redone with explicit 3-particle loop (Dhevan Gangadharan)
• Other issues:
  • Resonance enhancement in MEVSIM
  • Please, copy your code into $CVSROOT/offline/paper/psn0475/ directory
    (so far have codes from Sergei, Ilya, Evan and Alexei)

January 29, 14:00-15:30 EST; 631-344-2261

• Paper draft Version 15:
  • Update Figs. 4-8, 10: parity-hn posts 97, 100
  • Paper proposal page has been updated
• Support document:
  • Support note with new figures (Sergei Voloshin)
  • AuAu event generator results (Evan Finch)
• Charge conservation in AMPT:
  • Net charge from URQMD and AMPT (Evan Finch)
  • C.M. Ko and Z. Lin comments: see Page 9 of support note
• Analysis updates:
  • dAu correlations: redone with explicit 3-particle loop (Dhevan Gangadharan)
  • Presentations: CP 012909, pt efficiency, pt study (Vasily Dzordzhadze)
  • pt spectra from MEVSIM vs. data (Vasily Dzordzhadze)
• WWND talk (Dhevan Gangadharan)
  Comments:
  • Helen Caines
  • Evan Finch
  • Ilya Selyuzhenkov
  • Sergei Voloshin
• Other issues:
  • Text for resonance enhancement in MEVSIM?
  • Posting your code in cvs

January 22, 14:00-15:30 EST; 631-344-2261

• Paper draft Version 14:
  • Draft has been sent for GPC review
  • Updated Fig. 10 (AMPT results from Ilya and Evan has been combined)
  • Comments from bulccorr group (included in Version 14):
    • Paul Sorensen
    • Mike Lisa
  • Paper proposal page has been updated
• Supporting documents page at drupal has been created. Please comment
• Analysis updates:
  • dAu correlations: redone with explicit 3-particle loop (Dhevan Gangadharan)
  • pt cut study for Au+Au 200 GeV data (Alexei Chikanian)
• WWND talk (Dhevan Gangadharan)
  • Comments from Evan Finch
• More UrQMD events at b=0, 2, 4, 6, 8, and 10 (Paul Sorensen)

January 15, 14:00-15:30 EST; 631-344-2261

• Paper draft Version 12
  Expanded summary section (Sergei Voloshin)
Updated paper proposal web page at drupal

• GPC request:
  • bulccorr-hn thread
  • Sergei's note
• Paper's title - "Probe vs. Evidence":
  • Sergei Voloshin
  • Jack Sandweiss
  • Jim Thomas
  • Subhasis Chattopadhyay
• Paper comments:
  • Dhevan Gangadharan (theoretical question : correlator vs. sum_pt)
  • Richard Majka (comments for v09)
  • Vasily Dzordzhadze (comments for v10)
  • Jim Thomas (comments for v10)
• Paper figure updates and figure style:
  • Figure 4 (Ilya Selyuzhenkov)
  • Figure 10: AMPT results (Evan/Ilya)

January 08, 14:00-15:30 EST; 631-344-6363

• Paper draft Version 8 and Version 9 (original Sergei's post to parity-hn)
  Comments:
  • Bedanga Mohanty
  • Dhevan Gangadharan
  • Jack Sandweiss
  • Alexei Chikanian
  • Vasily Dzordzhadze: 1st and 2nd set of comments
  • Evan Finch
  Updated paper proposal web page at drupal
• Average AMPT correlations vs. Au+Au@200GeV data comparison (Ilya Selyuzhenkov)
• Updated "simulation" figure (Ilya Selyuzhenkov/Sergei Voloshin/Evan Finch):
  Needs to combine Evan/Ilya's AMPT results
• AMPT K0short results (Evan Finch)

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2008 meetings

December 22, 15:00pm; EVO STAR/parity room

• Feedback from BNL meeting with Steve Vigdor:
  Sergei's slides
  slides from Jack/Evan?
  Followup: Asymmetry directly proportional to magnetic field?
• paper draft update:
  version 07 (Sergei Voloshin)
  parity-hn discussion
• Paper proposal web page:
  Parity paper proposal at drupal
  PA's list: is it complete?
• Correlator in dAu collisions: ppt, gif and parity-hn (Dhevan Gangadharan)
• AMPT results: Centrality dependence (Ilya Selyuzhenkov)

December 15, 15:30pm EVO STAR/parity room

• Slides for Wendsday meeting with Steve Vigdor
• Status of the paper draft (Sergei Voloshin)
• Correlator in different eta ranges: ppt and parity-hn thread (Dhevan Gangadharan)
• Reconstructed particle correlations (Dhevan Gangadharan)
• AMPT results (Evan Finch):
  parity-hn, and v2 with/without quenching
  Au+Au simulations paper plot
• Mevsim simulations with enhanced and standard resonances (Vasily Dzordzhadze)
• AMPT results: correlations vs. eta and pt (Ilya Selyuzhenkov)
• cos(phi1-phi2) vs. pt sum from AuAu200 data (Sergei Voloshin)

December 08, 11:00am EVO STAR/parity room

• Feedback from bulkcorr PWG phone meeting (Sergei Voloshin)
• updated QM2009 abstract: pdf and bulcorr-hn thread (Sergei Voloshin)

December 01, 11:00am phone 631-344-2261

• Submission of two papers: PRL and PRC (Bedanga Mohanty)
• Quark Matter 2009 (Sergei Voloshin):
  Abstract on "Probe for the spontaneous strong parity violation in HIC at RHIC"
  Discussion at bulkcorr PWG list
• Speaker at WWND (All)
• First results from the jet studies: ppt and hyper-news post (Evan Finch)
• More realistic simulations (Alexei Chikanian)
• Pythia studies (Sergei Voloshin)

November 21, 12:00pm phone 631-344-8261

• Paper outline update (Jack Sandweiss)
• Paper draft:
  version 03 and version 02 (Sergei Voloshin)
  Draft of the section on "Simulation results" (Evan Finch)
• PYTHIA at higher pT (Evan Finch)
• Effect of recentering (Sergei Voloshin)
• Systematic checks with ZDC-SMD (Gang Wang)
• Cumulant correction and other matters (Jim Thomas)
  [includes: run sequence corrections; Ron's counting technique]
• WWND talk candidates (All)

November 05, 1:30pm phone 631-344-2261

• list of plots and questions for the paper (Jack Sandweiss)
• Parity_smop.eps and Parity_ppnn.eps (Gang Wang)
• pt dependent recentering (Sergei Voloshin)
• Parity presentation at bulkcorr phone meeting (Sergei Voloshin)
• Outline Of Parity Paper (Jack Sandweiss)

October 20, 3:30pm phone 631 344 2261

• 3:30 Update from Dima
• 3:50 A Recap of Recent Work with Cumulants and PID (Jim Thomas)
• 4:10 Reconstructed particle correlations (Dhevan Gangadharan)
• 4:30 Three particle correlation analysis(take 3) (Alexei Chikanian)
• 4:50 Sergei (did not specify but most likely has some valuable comments)
• 5:10 Some Mevsim Simulation Results (Vasily Dzordzhadze)
• 5:30 Discussion on paper, etc.

September 24, 4:00pm phone 631 344 6261

• Three particle correlation analysis (take 2) (Alexei Chikanian)
• An Independent Look at Parity Violation in the Strong Interaction via v12 * v2 (Jim Thomas)
• P-violation Observable in Mixed Events & Identified Particles (Dhevan Gangadharan)

September 16, 10:00am phone 631 344 2261

• Pythia/Hijing correlation studies (Evan Finch)
• Three particle correlation analysis (take 1) (Alexei Chikanian)
• Supprting document v.09 (Sergei Voloshin)
• Three Particle Correlation Study using Run 4 data (AuAu 200 GeV) (Vasily Dzordzhadze, Jim Thomas)

July 1, 10:30AM phone 877 322 9648, the participant code is 298859.

• Agenda at Yale page

May 30, 1:30-3:00pm phone 631 344 6261

• Three Parity Bubble Models (Ron Longacre)
• Deltas and rhos, Lambda-lambdabar pairs (Evan Finch)
• MEVSIM Simulation of Three Particle Correlations (Vasily Dzordzhadze)

March 29, 11:00AM-5:00pm phone 631 344 6261 BNL meeting, Room 1-188

• 11:00 Jack Sandweiss
• 12:00 Lunch
• 1:00 Sergei Voloshin
• 2:00 aa and radial flow + charge conservation (Paul Sorensen)
• 2:00 Vasily Dzhordzhadze
• 3:00 discussion

January 17, 4:00pm phone 631 344 6363

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2007 meetings (list incomplete)

December 25, 2:00pm phone 631 344 8383

Parity paper proposal

Azimuthal Charged-Particle Correlations
and Possible Local Strong Parity Violation

Published in Phys. Rev. Lett. 103, 251601 (2009)

Abstract
Parity-odd domains, corresponding to nontrivial topological solutions of the QCD vacuum,
might be created during relativistic heavy-ion collisions.
These domains are predicted to lead to charge separation of quarks along the system’s orbital momentum axis.
We investigate a three-particle azimuthal correlator which is a P even observable,
but directly sensitive to the charge separation effect.
We report measurements of charged hadrons near center-of-mass rapidity
with this observable in Au+Au and Cu+Cu collisions at √sNN=200  GeV using the STAR detector.
A signal consistent with several expectations from the theory is detected.
We discuss possible contributions from other effects that are not related to parity violation.

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Observation of charge-dependent azimuthal correlations
and possible local strong parity violation in heavy-ion collision

Published in Phys. Rev. C 81, 054908 (2010)

Abstract
Parity (P)-odd domains, corresponding to nontrivial topological solutions of the QCD vacuum,
might be created during relativistic heavy-ion collisions.
These domains are predicted to lead to charge separation of quarks
along the orbital momentum of the system created in noncentral collisions.
To study this effect, we investigate a three-particle mixed-harmonics azimuthal correlator
which is a P-even observable, but directly sensitive to the charge-separation effect.
We report measurements of this observable using the STAR detector in Au+Au and Cu+Cu collisions at √sNN=200 and 62 GeV.
The results are presented as a function of collision centrality,
particle separation in rapidity, and particle transverse momentum.
A signal consistent with several of the theoretical expectations is detected in all four data sets.
We compare our results to the predictions of existing event generators and
discuss in detail possible contributions from other effects that are not related to P violation.

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Data & figures

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Principal authors

• Wayne State: Sergei Voloshin
• Indiana: Ilya Selyuzhenkov
• BNL: Vasily Dzordzhadze, Ron Longacre, Yannis Semertzidis, Paul Sorensen
• UCLA: Gang Wang, Dhevan Gangadharan
• Yale: Jack Sandweiss, Evan Finch, Alexey Chikanian, Richard Majka
• LBNL: Jim Thomas
• MEPhI: Vitaly Okorokov

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GPC members

• Carl Gagliardi, Chair
• Ernst Sichtermann, Member
• Peter Seyboth, Member
• Mike Lisa, PWG representative
• Spencer Klein, English/Grammar QA
• Jin-Hui Chen, Analysis Code QA
• Sergei Voloshin, PA Representative
• Jack Sandweiss, PA Representative

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Collaboration Comments

• Collaboration comments on PRL (short draft)
• Collaboration comments on PRC (long draft)

GPC Comments

• PRC (long draft) GPC comments

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Support document

• STAR note PSN0475
• More support documents
• Software repository
• Parity group meetings

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PRC paper draft version history

Source files: LaTeX and macros
Previous versions:
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31 32 prc2

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PRL paper draft version history

Source files: LaTeX and macros
Previous versions:
01 02 03 04 05 06 07 08 09 10
11 12 13 14 15 16 17 18toPRL