A measurement of $\Lambda$ polarization in inclusive production by $\Sigma^{-}$ of 340 GeV/c in C and Cu targets - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles European Physical Journal C: Particles and Fields Year : 2004

A measurement of $\Lambda$ polarization in inclusive production by $\Sigma^{-}$ of 340 GeV/c in C and Cu targets

M.I. Adamovich
  • Function : Author
Yu.A. Alexandrov
  • Function : Author
S.P. Baranov
  • Function : Author
D. Barberis
  • Function : Author
M. Beck
  • Function : Author
W. Beusch
  • Function : Author
M. Boss
  • Function : Author
S. Brons
  • Function : Author
W. Brueckner
  • Function : Author
C. Busch
  • Function : Author
C. Buescher
  • Function : Author
E.A. Chudakov
  • Function : Author
U. Dersch
  • Function : Author
F. Dropmann
  • Function : Author
J. Engelfried
  • Function : Author
F. Faller
  • Function : Author
S.G. Gerassimov
  • Function : Author
M. Godbersen
  • Function : Author
P. Grafstroem
  • Function : Author
T. Haller
  • Function : Author
M. Heidrich
  • Function : Author
E. Hubbard
  • Function : Author
R.B. Hurst
  • Function : Author
K. Koenigsmann
  • Function : Author
I. Konorov
  • Function : Author
N. Keller
  • Function : Author
K. Martens
  • Function : Author
S. Masciocchi
  • Function : Author
R. Michaels
  • Function : Author
U. Mueller
  • Function : Author
H. Neeb
  • Function : Author
D. Newbold
  • Function : Author
C. Newsom
  • Function : Author
S. Paul
  • Function : Author
J. Pochodzalla
  • Function : Author
I. Potashnikova
  • Function : Author
B. Povh
  • Function : Author
R.D. Ransome
  • Function : Author
Zhuoxiang Ren
  • Function : Author
G. Rosner
  • Function : Author
L. Rossi
  • Function : Author
H. Rudolph
  • Function : Author
C. Scheel
  • Function : Author
L. Schmitt
  • Function : Author
H.W. Siebert
  • Function : Author
A. Simon
V.J. Smith
  • Function : Author
O. Thilmann
  • Function : Author
A. Trombini
  • Function : Author
B. Volkemer
  • Function : Author
K. Vorwalter
  • Function : Author
T. Waelcher
  • Function : Author
G. Waelder
  • Function : Author
R. Werding
  • Function : Author
E. Wittmann
  • Function : Author
M.V. Zavertyaev
  • Function : Author

Abstract

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

in2p3-00020277 , version 1 (21-01-2004)

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Cite

M.I. Adamovich, Yu.A. Alexandrov, S.P. Baranov, D. Barberis, M. Beck, et al.. A measurement of $\Lambda$ polarization in inclusive production by $\Sigma^{-}$ of 340 GeV/c in C and Cu targets. European Physical Journal C: Particles and Fields, 2004, 32, pp.221-228. ⟨10.1140/epjc/s2003-01357-3⟩. ⟨in2p3-00020277⟩
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