Measurement of Charge Asymmetry Correlations in Heavy Ion Collisions Quan Wang, Purdue For STAR Collaboration 111/4/2010DNP 2010.

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Presentation transcript:

Measurement of Charge Asymmetry Correlations in Heavy Ion Collisions Quan Wang, Purdue For STAR Collaboration 111/4/2010DNP 2010

Outline  Motivation : Chiral Magnetic Effect  Charge Asymmetry Observables  Results  Summary 211/4/2010DNP 2010

Motivation  Chiral Magnetic Effect:  LPV + large magnetic field  charge separation along the system angular momentum.  Kharzeev et al. NPA 803 (2008) /4/2010DNP 2010

Chiral Magnetic Effect (CME) u L R +2/3 Color Field B Field u dd +2/3 -1/3 LR R R 411/4/2010DNP 2010 Charge Separation

Charge Asymmetry Observables UP DOWN LEFT RIGHT EP  LPV effects in UD. LR is null- reference.  LPV expectations:  A +UD and A -UD are anti- correlated → ‹A + A - › UD < ‹A + A - › LR  Additional dynamical fluctuation broadens A ±UD distributions → ‹A ± 2 › UD > ‹A ± 2 › LR 511/4/2010DNP 2010

 ‹A 2 ›  In peripheral, both  ‹A 2 › UD and  ‹A 2 › LR are positive.  Like-sign pairs more likely in same direction. (small- angle correlation)  In central, both negative.  Like-sign pair more likely back-to-back.  Small-angle same-sign correlation is stronger in UD than LR. STAR preliminary 611/4/2010DNP 2010

‹A + A - › o Both ‹A + A - › UD and ‹A + A - › LR are large and positive. o Positive and negative charge particles are strongly correlated. o Small-angle opposite-sign correlation is stronger in UD than LR. STAR preliminary 711/4/2010DNP 2010

UD-LR   ‹A 2 › UD >  ‹A 2 › LR  Same-sign broadening in UD is larger than LR, consistent with LPV expectation.  However, same-sign are preferentially back-to-back. STAR preliminary o ‹A + A - › UD > ‹A + A - › LR > 0  Opposite-sign are more strongly emitted in the same direction in UD than LR, which is inconsistent with LPV expectation  Similar centrality dep. 811/4/2010DNP 2010

Summary  Dynamical charge asymmetry correlations are presented.  Same-sign (  ‹A 2 ›):  more small-angle correlation in peripheral.  more back-to-back in mid-central to central.  broadening more strongly in UD than LR.  Opposite-sign (‹A + A - ›):  always in the same direction.  More strongly in UD than LR.  Same-sign measurements COULD BE consistent with LPV expectation, while the opposite-sign measurements are inconsistent with LPV expectation. More experimental as well as theoretical works are needed to further investigate the underlying physics. 911/4/2010DNP 2010

Analysis Details  Data set: – AuAu 2004 MinBias 200GeV (20M events)  Standard STAR event and track cuts  To avoid self-correlation effect: 1.EP: η 0 2.EP: η>0; Asym η<0 η>0η<0 1011/4/2010DNP 2010

‹A 2 ›, ‹A + A - › and Stat. Fluc.  Statistic fluctuation and detector effect, Dashed line.  Stat. Fluc. Shows only in ‹A 2 ›, and is larger then ‹A 2 ›  TPC Random Flip  STAR preliminary 1111/4/2010DNP 2010

Summary of  ‹A 2 › and ‹A + A - ›  In peripheral, particles are preferentially in same direction, regardless same- sign or opposite-sign charges.  In mid-central to central, opposite-sign prefer in the same direction, but same- sign prefer back-to-back. STAR preliminary 1211/4/2010DNP 2010

LR-UD Compared to 3-point Correlator  UD-LR: infinite number of harmonic terms.   ‹A 2 ›: Higher-order terms may be small. o  ‹A + A - ›: Higher-order terms are important. STAR preliminary 1311/4/2010DNP 2010