A measurement of Λ and Ξ − polarization in inclusive production by Σ − of 340 GeV/c in C and Cu targets
We have measured the polarization of Λ and Ξ − hyperons produced inclusively by a Σ − beam of 340 GeV/c momentum in nuclear targets, using samples of 9.5 million Λ decays and 880000 Ξ − decays. The large statistics allowed a two-dimensional analysis as functions of x F and p t . The polarization w.r...
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| Published in | Nuclear physics. A Vol. 755; pp. 443 - 446 |
|---|---|
| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier B.V
13.06.2005
|
| Online Access | Get full text |
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| Summary: | We have measured the polarization of Λ and
Ξ
−
hyperons produced inclusively by a
Σ
−
beam of 340 GeV/c momentum in nuclear targets, using samples of 9.5 million Λ decays and 880000
Ξ
−
decays. The large statistics allowed a two-dimensional analysis as functions of
x
F
and
p
t
. The polarization w.r.t. the production normal is mainly positive for Λ and negative for
Ξ
−
. The positive sign of the Λ polarization is opposite to predictions. At
p
t
>
1
Gev
/
c
, the Λ polarization decreases to zero or even negative values, in sharp contrast to the plateau above
p
t
>
1
Gev
/
c
observed in inclusive Λ production by protons. No such effect is observed for the
Ξ
−
polarization, and its sign is as expected. |
|---|---|
| ISSN: | 0375-9474 |
| DOI: | 10.1016/j.nuclphysa.2005.03.053 |