Measurement of transverse single-spin asymmetries for di-jet production in proton-proton collisions at s**(1/2) = 200-GeV - INSPIRE

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Measurement of transverse single-spin asymmetries for di-jet production in proton-proton collisions at s**(1/2) = 200-GeV

STAR

Collaboration

May, 2007

6 pages

Published in:

Phys.Rev.Lett. 99 (2007) 142003

e-Print:

0705.4629 [hep-ex]

DOI:

10.1103/PhysRevLett.99.142003

Experiments:

BNL-RHIC-STAR

View in:

reference search65 citations

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Abstract: (arXiv)

We report the first measurement of the opening angle distribution between pairs of jets produced in high-energy collisions of transversely polarized protons. The measurement probes (Sivers) correlations between the transverse spin orientation of a proton and the transverse momentum directions of its partons. With both beams polarized, the wide pseudorapidity (

-1 \leq \eta \leq +2

) coverage for jets permits separation of Sivers functions for the valence and sea regions. The resulting asymmetries are all consistent with zero and considerably smaller than Sivers effects observed in semi-inclusive deep inelastic scattering (SIDIS). We discuss theoretical attempts to reconcile the new results with the sizable transverse spin effects seen in SIDIS and forward hadron production in pp collisions.

Note:

6 pages total, 1 Latex file, 3 PS files with figures

13.88.+e
24.70.+s
13.85.-t
13.87.-a
p p: colliding beams
polarized beam: transverse
jet: pair production
angular distribution: (2jet)
spin: asymmetry
Sivers function

References(28)

Figures(0)

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Measurement of Sivers Asymmetries for Di-jets in sqrt $s$ =200 GeV $pp$ Collisions at STAR

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Collaboration

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