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Proton - lambda correlations in central Au+Au collisions at S(NN)**(1/2) = 200-GeV

The collaboration
Phys.Rev.C 74 (2006) 064906, 2006.

Abstract (data abstract)
We report on $p-\Lambda$, $p-\bar{\Lambda}$, $\bar{p}-\Lambda$, and $\bar{p}-\bar{\Lambda}$ correlation functions constructed in central $Au-Au$ collisions at $\sqrt{s_{NN}}=200$ GeV by the STAR experiment at RHIC. The proton and lambda source size is inferred from the $p-\Lambda$ and $\bar{p}-\bar{\Lambda}$ correlation functions. It is found to be smaller than the pion source size also measured by the STAR experiment at smaller transverse masses, in agreement with a scenario of a strong universal collective flow. The $p-\bar{\Lambda}$ and $\bar{p}-\Lambda$ correlation functions, which are measured for the first time, exhibit a large anticorrelation. Annihilation channels and/or a negative real part of the spin-averaged scattering length must be included in the final-state interactions calculation to reproduce the measured correlation function.

• #### Table 1

Data from Fig. 1a

10.17182/hepdata.98927.v1/t1

Invariant mass of the selected $\Lambda$ background not substracted with $0.3 < p_t < 2.0$ GeV/c. The y axis represents...

• #### Table 2

Data from Fig. 1b

10.17182/hepdata.98927.v1/t2

Invariant mass of the selected $\bar{\Lambda}$ background not substracted with $0.3 < p_t < 2.0$ GeV/c. The y axis represents...

• #### Table 3

Data from Fig. 2a

10.17182/hepdata.98927.v1/t3

The purity and momentum-resolution corrected correlation functions $C_{true}(k^{*})$ for $p-\Lambda$, $\bar{p}-\bar{\Lambda}$ (a), $\bar{p}-\Lambda$, $p-\bar{\Lambda}$ (b). Curves correspond to fits done...

• #### Table 4

Data from Fig. 2b

10.17182/hepdata.98927.v1/t4

The purity and momentum-resolution corrected correlation functions $C_{true}(k^{*})$ for $p-\Lambda$, $\bar{p}-\bar{\Lambda}$ (a), $\bar{p}-\Lambda$, $p-\bar{\Lambda}$ (b). Curves correspond to fits done...

• #### Table 5

Data from Fig. 3

10.17182/hepdata.98927.v1/t5

$(p-\Lambda) \oplus (\bar{p}-\bar{\Lambda})$ and $(\bar{p}-\Lambda) \oplus (p-\bar{\Lambda})$ combined correlation functions. Correlation functions are corrected for purity and momentum resolution. Curves...

• #### Table 6a

Data from Fig. 4, $(\bar{p}-\Lambda) \oplus (p-\bar{\Lambda})$

10.17182/hepdata.98927.v1/t6

The combined $(\bar{p}-\Lambda) \oplus (p-\bar{\Lambda})$ spin-averaged $s$-wave scattering length compared with the previous measurements for the $p-\bar{p}$ system [24-27]. The...

• #### Table 6b

Data from Fig. 4, $p-\bar{p}$

10.17182/hepdata.98927.v1/t7

The combined $(\bar{p}-\Lambda) \oplus (p-\bar{\Lambda})$ spin-averaged $s$-wave scattering length compared with the previous measurements for the $p-\bar{p}$ system [24-27]. The...

• #### Table 7

Data from Fig. 5

10.17182/hepdata.98927.v1/t8

Pion source size [5] compared with proton and lambda source sizes as a function of the mean transverse mass \$(\langle...