Longitudinal Spin Transfer to Lambda and anti-Lambda Hyperons in Polarized Proton-Proton Collisions at s**(1/2) = 200-GeV

Abelev, B.I.; Aggarwal, M.M.; Ahammed, Z.; Alakhverdyants, A.V.; Anderson, B.D.; Arkhipkin, D.; Averichev, G.S.; Balewski, J.; Barannikova, O.; Barnby, L.S.

doi:10.1103/PhysRevD.80.111102

Longitudinal Spin Transfer to Lambda and anti-Lambda Hyperons in Polarized Proton-Proton Collisions at s**(1/2) = 200-GeV

STAR

Collaboration

Oct, 2009

7 pages

Published in:

Phys.Rev.D 80 (2009) 111102

e-Print:

0910.1428 [hep-ex]

DOI:

10.1103/PhysRevD.80.111102

Experiments:

BNL-RHIC-STAR

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Abstract: (arXiv)

The longitudinal spin transfer,

D_{LL}

, from high energy polarized protons to

\Lambda

and

\bar{\Lambda}

hyperons has been measured for the first time in proton-proton collisions at

\sqrt{s} = 200 \mathrm{GeV}

with the STAR detector at RHIC. The measurements cover pseudorapidity,

\eta

, in the range

|\eta| < 1.2

and transverse momenta,

p_\mathrm{T}

, up to

4 \mathrm{GeV}/c

. The longitudinal spin transfer is found to be

D_{LL}= -0.03\pm 0.13(\mathrm{stat}) \pm 0.04(\mathrm{syst})

for inclusive

\Lambda

and

D_{LL} = -0.12 \pm 0.08(\mathrm{stat}) \pm 0.03(\mathrm{syst})

for inclusive

\bar{\Lambda}

hyperons with

<\eta> = 0.5

and

<p_\mathrm{T}> = 3.7 \mathrm{GeV}/c

. The dependence on

\eta

and

p_\mathrm{T}

is presented.

Note:

5 pages, 4 figures

13.85.Ni
13.85.Hd
13.88.+e
13.87.Fh
OSG : STAR
p p: inelastic scattering
polarized beam: longitudinal
Lambda: hadroproduction
Lambda: polarization
Antilambda: polarization

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