Baranov, S.P.
WA89
POL
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A measurement of $\Lambda$ polarization in inclusive production by $\Sigma^-$ of 340-GeV/c in C and Cu targets

The WA89 collaboration Adamovich, M.I. ; Alexandrov, Yu.A. ; Baranov, S.P. ; et al.
Eur.Phys.J.C 32 (2004) 221-228, 2004.
Inspire Record 645459 DOI 10.17182/hepdata.43190

We have measured the polarization of $\Lambda$ hyperons produced inclusively by a $\Sigma^-$ beam of 340 GeV/c momentum in nuclear targets. From a sample of 9.5 millions of identified $\Lambda$ decays, polarizations were determined in the range $x_F \gt 0.1$ and $p_t\leq 1.6$ GeV/c . The polarization w.r.t. the production normal is mainly positive for $x_F \geq 0.3$. At fixed values of $x_F$, it increases with $p_t$ to a maximum between $p_t = 0.5$ and $p_t = 1$ GeV/c , and then decreases to zero or even negative values, in sharp contrast to the plateau above $p_t = 1$ GeV/c observed in inclusive $\Lambda$ production by protons.

8 data tables
Table 1

Measured values of the LAMBDA polarization as a function of PT in the XL range 0.1 to 0.2.

Table 2

Measured values of the LAMBDA polarization as a function of PT in the XL range 0.2 to 0.3.

Table 3

Measured values of the LAMBDA polarization as a function of PT in the XL range 0.3 to 0.4.

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