Search for Chiral Magnetic Effects in High-Energy Nuclear Collisions

Slides:



Advertisements
Similar presentations
Spontaneous Parity Violation in Strong Interactions Dhevan Gangadharan (UCLA) On behalf of the STAR Collaboration WWND
Advertisements

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.
Measurements of long-range angular correlation and identified particle v 2 in 200 GeV d+Au collisions from PHENIX Shengli Huang Vanderbilt University for.
Measurement of v 2 and v 4 in Au+Au Collisions at different beam energy from PHENIX Shengli Huang for PHENIX Collaboration Vanderbilt University.
Searches for Exotic Particles and Phenomena at RHIC Huan Zhong Huang 黄焕中 Department of Physics and Astronomy University of California Los Angeles, CA
Anti-hypernuclei production and search for P-odd domain formation at RHIC Gang Wang ( for the STAR Collaboration ) UCLA A colored and flavored system in.
R. Lacey, SUNY Stony Brook PHENIX Measurements of Anisotropic Flow in Heavy-Ion Collisions at RHIC Energies 1 Nuclear Chemistry Group, SUNY Stony Brook,
ICPAQGP, Kolkata, February 2-6, 2015 Itzhak Tserruya PHENIX highlights.
Luan Cheng (Institute of Particle Physics, Huazhong Normal University) I. Introduction II. Interaction Potential with Flow III. Flow Effects on Light Quark.
Experimental Results for Fluctuations And Correlations as a Signature of QCD Phase Transitions in Heavy Ion Collisions Gary Westfall Michigan State University,
STAR Strangeness production in jets from p+p 200 GeV collisions Anthony Timmins for the STAR Collaboration  Motivation  Analysis  Results  Summary.
Identified and Inclusive Charged Hadron Spectra from PHENIX Carla M Vale Iowa State University for the PHENIX Collaboration WWND, March
Gang Wang (WWND2010)1 Search for local parity violation with STAR ZDC-SMD Gang Wang (UCLA) for 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.
Charge Asymmetry Correlations Searching for Local Parity Violation Quan Wang, Purdue For STAR Collaboration.
Measurement of Charge Asymmetry Correlations in Heavy Ion Collisions Quan Wang, Purdue For STAR Collaboration 111/4/2010DNP 2010.
Hadronic Resonances in Heavy-Ion Collisions at ALICE A.G. Knospe for the ALICE Collaboration The University of Texas at Austin 25 July 2013.
R. Lacey, SUNY Stony Brook The PHENIX Flow Data: Current Status Justin Frantz (for T.Todoroki) Ohio University WWND 15 Keystone, CO 1 (Filling in For Takahito.
Nu Xu1/17 24 th CBM Collaboration Meeting, Krakow, Poland, September 8 – 12, 2014 Study the QCD Phase Structure at the High Baryon Density Nu Xu (1,2)
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)
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.
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.
1 Identified particle production in the Beam Energy Scan from STAR Anthony Timmins for the STAR Collaboration  The Beam energy scan  The STAR experiment.
Two Particle Correlations and Viscosity in Heavy Ion Collisions Monika Sharma for the Wayne State University STAR Collaboration Outline: Motivation Measurement.
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.
1 Search for effects related to Chiral Magnetic Wave at STAR Gang Wang (UCLA) for STAR Collaboration.
Christof Roland / MITSQM 2004September 2004 Christof Roland / MIT For the NA49 Collaboration Strange Quark Matter 2004 Capetown, South Africa Event-by-Event.
STAR Strangeness production and Cronin effect in d+Au collisions at √s NN = 200 GeV in STAR For the STAR Collaboration Xianglei Zhu (Tsinghua U / UCLA)
Charged Hadron Nuclear Modification Factors in the Beam Energy Scan data from STAR Stephen Horvat for the STAR collaboration Yale University Stephen HorvatCPOD.
G. Musulmanbekov, K. Gudima, D.Dryablov, V.Geger, E.Litvinenko, V.Voronyuk, M.Kapishin, A.Zinchenko, V.Vasendina Physics Priorities at NICA/MPD.
S.A. Voloshin School of Collective Dynamics in High Energy Collisions, LBNL, June 7-11, 2010 page 1 Local strong parity violation and new perspectives.
Recent Charm Measurements through Hadronic Decay Channels with STAR at RHIC in 200 GeV Cu+Cu Collisions Stephen Baumgart for the STAR Collaboration, Yale.
1 Jeffery T. Mitchell – Quark Matter /17/12 The RHIC Beam Energy Scan Program: Results from the PHENIX Experiment Jeffery T. Mitchell Brookhaven.
Energy Scan of Hadron (  0 ) Suppression and Flow in Au+Au Collisions at PHENIX Norbert Novitzky for PHENIX collaboration University of Jyväskylä, Finland.
Search for the QCD Critical Point Gary D. Westfall Michigan State University For the STAR Collaboration Gary Westfall for STAR – Erice,
Incident-energy and system-size dependence of directed flow Gang Wang (UCLA) for STAR Collaboration  Introduction to directed flow  Detectors: ZDC-SMD,
Hadron Collider Physics 2012, 12/Nov/2012, KyotoShinIchi Esumi, Univ. of Tsukuba1 Heavy Ion results from RHIC-BNL ShinIchi Esumi Univ. of Tsukuba Contents.
Azimuthal Anisotropy in U+U Collisions Hui Wang (BNL) and Paul Sorensen (bnl) for the STAR Collaboration Hard Probes 2013, Cape Town, South Africa.
Measurement of D-meson azimuthal anisotropy in Au+Au 200GeV collisions at RHIC Michael R. Lomnitz Kent State University Lawrence Berkeley National Laboratory.
STAR QM2009 Experimental study of spontaneous strong parity violation… S.A. Voloshinpage 1 Experimental study of spontaneous strong parity violation in.
STAR Christine Nattrass (STAR Collaboration), Yale University DNP, Nashville, 28 October Two particle azimuthal correlations in Cu+Cu collisions.
Robert Pak (BNL) 2012 RHIC & AGS Annual Users' Meeting 0 Energy Ro Robert Pak for PHENIX Collaboration.
Femtoscopy in √s = 200 GeV p+p collisions at RHIC-PHENIX Andrew Glenn for the collaboration Lawrence Livermore National Lab HAW09: Joint APS/DNP JPS Meeting.
N. N. Ajitanand Nuclear Chemistry, SUNY Stony Brook For the PHENIX Collaboration RHIC & AGS Users Meeting June Investigation of Parity Violation.
Dhevan Gangadharan (for the STAR Collaboration) Postdoctoral Researcher at CERN--Ohio State University.
Near-side  correlations of high-p t hadrons from STAR Jörn Putschke for the STAR collaboration Lawrence Berkeley National Laboratory Weisshorn (4505m),
Christof Roland / MITQuark Matter 2004January 2004 Christof Roland / MIT For the NA49 Collaboration Quark Matter 2004 Oakland,CA Event-by-Event Fluctuations.
Hadronic resonance production in Pb+Pb collisions from the ALICE experiment Anders Knospe on behalf of the ALICE Collaboration The University of Texas.
24 June 2007 Strangeness in Quark Matter 2007 STAR 2S0Q0M72S0Q0M7 Strangeness and bulk freeze- out properties at RHIC Aneta Iordanova.
S.A. Voloshin STAR ICHEP 2006, Moscow, RUSSIA, July 26 – August 2, 2006page1 Sergei A. Voloshin Wayne State University, Detroit, Michigan for the STAR.
Dhevan Gangadharan UCLA STAR Collaboration DNP meeting 10/25/08 1.
Jet Production in Au+Au Collisions at STAR Alexander Schmah for the STAR Collaboration Lawrence Berkeley National Lab Hard Probes 2015 in Montreal/Canada.
Heavy Flavor Measurements at RHIC&LHC W. Xie (Purdue University, West Lafayette) W. Xie (Purdue University, West Lafayette) Open Heavy Flavor Workshop.
PHENIX Results from the RHIC Beam Energy Scan Brett Fadem for the PHENIX Collaboration Winter Workshop on Nuclear Dynamics 2016.
TWO PARTICLE CORRELATION MEASUREMENTS AT PHENIX Takahito Todoroki For the PHENIX Collaboration University of Tsukuba & RIKEN Nishina Center Hard Probes.
Chiral Magnet Effect, where are we?
Monika Sharma Wayne State University for the STAR Collaboration
High-pT Identified Hadron Production in Au+Au and Cu+Cu Collisions
Strangeness Production in Heavy-Ion Collisions at STAR
ATLAS vn results vn from event plane method
Tatsuya Chujo for the PHENIX collaboration
Scaling Properties of Fluctuation and Correlation Results from PHENIX
Xiaobin Wang (for the STAR Collaboration)
High-pT Identified Charged Hadrons in √sNN = 200 GeV Au+Au Collisions
Identified Charged Hadron
System Size and Energy Dependence of -meson Production at RHIC
Hiroshi Masui for the PHENIX collaboration August 5, 2005
Identified Charged Hadron Production at High pT
Stony Brook University
Presentation transcript:

Search for Chiral Magnetic Effects in High-Energy Nuclear Collisions Gang Wang (UCLA) for STAR Collaboration

Peak magnetic field ~ 1015 Tesla ! Motivation CSE + CME → Chiral Magnetic Wave: collective excitation signature of Chiral Symmetry Restoration Peak magnetic field ~ 1015 Tesla ! (Kharzeev et al. NPA 803 (2008) 227)

Y. Burnier, D. E. Kharzeev, J. Liao and H-U Yee, Observable I Y. Burnier, D. E. Kharzeev, J. Liao and H-U Yee, Phys. Rev. Lett. 107, 052303 (2011) Formation of electric quadrupole: , where charge asymmetry is defined as . Then π- v2 should have a positive slope as a function of A±, and π+ v2 should have a negative slope with the same magnitude. The integrated v2 of π- is not necessarily bigger than π+: (other physics) only the A± dependency matters for CMW testing.

Kharzeev, McLerran, Warringa, NPA803:227 (2008) Observable II CME + Parity-odd domain, => charge separation across RP This charge separation effect needs to be beyond conventional physics background. S. Voloshin, PRC 70 (2004) 057901, Kharzeev, PLB633:260 (2006) Kharzeev, McLerran, Warringa, NPA803:227 (2008)

Observed charge asymmetry N+ (N-) is the number of positive (negative) particles within |η|<1. The distribution was divided into 5 bins, with roughly equal counts. Tracking efficiency was corrected later.

Charge asymmetry dependency v2 was measured with the Q-cumulant method. Clear A± dependency v2(A±) slopes for π±: opposite sign similar magnitude v2 difference vs A± may have a non-zero intercept: other physics?

Correction for tracking efficiency Fit with a straight line to extract the slope . Do the same for all centralities

Slope vs centrality Y. Burnier, D. E. Kharzeev, J. Liao and H-U Yee, arXiv:1208.2537v1 [hep-ph]. Similar trends between data and theoretical calculations with CMW (improved version). There is no specific beam energy input for the calculation. UrQMD with no CMW can not reproduce the slopes.

Slope vs centrality (BES) Y. Burnier, D. E. Kharzeev, J. Liao and H-U Yee, arXiv:1208.2537v1 [hep-ph]. Similar trends are observed for different beam energies, where the errors are small.

Please also see Hongwei Ke's poster! Summary I Charge asymmetry dependecy of pion v2 has been observed. v2(A) showed opposite slopes for π+ and π-. The slopes have similar centrality dependency from 200 GeV to 27 GeV. Similarity between real data and calculations with CMW Similar trends of slope vs centrality UrQMD (w/o CMW) showed no such effects. Further systematic checks Weak decay contribution Handle on the magnetic field B Other physics interpretations Quark transportation? Hadronic potential? Please also see Hongwei Ke's poster!

CME + Local Parity Violation A direct measurement of the P-odd quantity “a” should yield zero. S. Voloshin, PRC 70 (2004) 057901 Directed flow: expected to be the same for SS and OS Non-flow/non-parity effects: largely cancel out P-even quantity: still sensitive to charge separation

Beam energy scan ALICE, arXiv:1207.0900 From 2.76 TeV to 7.7 GeV, changes start to show from the peripheral collisions.

Consider γOS-γSS to be signal... ALICE, arXiv:1207.0900 The signal seems to be disappearing at 7.7 GeV, but the statistical errors are large.

Possible physics background charge conservation/cluster + v2 Pratt, Phys.Rev.C83:014913,2011 ΨRP 70-80% + - + - 0-5% STAR, Phys. Rev. C72 (2005) 014904 Seemingly correlated! Can we disentangle the relationship with U+U? In RHIC run2012, we took 350M minbias events and 14M central trigger events.

Voloshin, Phys.Rev.Lett. 105(2010)172301 U+U A larger and deformed system v2(M) in U+U is higher than that in Au+Au. Not as high as expected in central collisions. (4% expected) The cusp in the simulation not seen. If any, maybe in very central events. Masui, Phys.Lett.B679:440-444,2009 Voloshin, Phys.Rev.Lett. 105(2010)172301

v2 in U+U If dN/dη is divided by the overlap area (S) and v2 is divided by eccentricity, there is a split in central and mid-central collisions. The area and eccentricity are calculated with Glauber Monte Carlo.

LPV in U+U The difference between OS and SS is still there in U+U, with similar magnitudes. Consider OS-SS to be the signal Npart accounts for dilution effects A dedicated trigger selected events with 0-1% spectator neutrons. With the magnetic field suppressed, the charge separation signal disappears (while v2 is still ~ 2.5%). 70-80% 0-5%

See also Kent Riley's poster! Summary II The three-point correlation showed charge separation w.r.t RP (γOS - γSS) has similar magnitudes from 2.76 TeV to 11.5 GeV Similar in Au+Au, Pb+Pb and U+U (also in Cu+Cu, not shown) The signal of charge separation seems to disappear when the beam energy is down to ~7.7GeV the magnetic field from spectators is supressed (v2 is still sizable) Further studies Correlations between identified particles pion, kaon, proton and Lambda Collisions of isobars? U+U collisions show interesting features of v2, which needs further investigation and calls for interpretation... See also Kent Riley's poster!

Backup slides

STAR: excellent PID and tracking The correlation measurements at STAR are accurate to relative 0.1%.

Slope vs centrality Improvement of theoretical calculations with CMW: Y. Burnier, D. E. Kharzeev, J. Liao and H-U Yee, Phys. Rev. Lett. 107, 052303 (2011) and arXiv:1208.2537v1 [hep-ph]. Improvement of theoretical calculations with CMW: Simplified hard-disk (pancake) type of model -> Monte Carlo Glauber

Multi-component Coalescence (MCC) + Quark Transport John Campbell's poster.

Results with different EPs STAR Preliminary Lost in the medium? The correlators using TPC/ZDC event planes are consistent with each other.

Dilution effect The net effect is like a random walk, but In the quark-gluon medium, there could be multiple P-odd domains. The net effect is like a random walk, but one-dimensional. What do we know about the position Rn after n steps? Rn follows a Gaussian distribution: mean = 0, and rms = Our measurement of PV is like Rn2, expected to be n. Compared with going in one fixed direction, where Rn2 = n2, the "random-walk" measurement is diluted by a factor ~ n ~ Npart.

Two particle correlation Two-particle correlation changes significantly with beam energy.

Possible physics background charge conservation/cluster + v2 70-80% 0-5% Pratt, Phys.Rev.C83:014913,2011 70-80% 0-5%

Pratt, Phys.Rev.C83:014913,2011 Balance function