Three pion HBT correlations in relativistic heavy ion collisions from the STAR experiment

The collaboration
Phys.Rev.Lett. 91 (2003) 262301, 2003.

Abstract (data abstract)
Data from the first physics run at the Relativistic Heavy-Ion Collider at Brookhaven National Laboratory, Au+Au collisions at $\sqrt{s_{NN}}$=130 GeV, have been analyzed by the STAR Collaboration using three-pion correlations with charged pions to study whether pions are emitted independently at freezeout. We have made a high-statistics measurement of the three-pion correlation function and calculated the normalized three-particle correlator to obtain a quantitative measurement of the degree of chaoticity of the pion source. It is found that the degree of chaoticity seems to increase with increasing particle multiplicity.

• #### Figure 1

10.17182/hepdata.97121.v1/t1

Values for the three-pion correlation function using high multiplicity negative pions. Errors are statistical+systematic.

• #### Figure 2

10.17182/hepdata.97121.v1/t2

Three-pion correlator values (r3/2) for positive and negative pions in central and mid-central events. Errors are statistical+systematic.

• #### Figure 3

10.17182/hepdata.97121.v1/t3

Three-pion correlator intercept values (r3(0)/2) for positive and negative pions in central and mid-central events compared with other experiments. Errors...

• #### Figure 4

10.17182/hepdata.97121.v1/t4

Chaotic fraction values (epsilon) for positive and negative pions in central and mid-central events versus dN/deta compared with other experiments....