Single Transverse Spin Asymmetries of Identified Charged Hadrons in Polarized p+p Collisions at s**(1/2) = 62.4-GeV - INSPIRE

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Single Transverse Spin Asymmetries of Identified Charged Hadrons in Polarized p+p Collisions at s**(1/2) = 62.4-GeV

BRAHMS

Collaboration

•

I. Arsene
(
- Oslo U.
)

Jan, 2008

5 pages

Published in:

Phys.Rev.Lett. 101 (2008) 042001

e-Print:

0801.1078 [nucl-ex]

DOI:

10.1103/PhysRevLett.101.042001

Experiments:

BNL-RHIC-BRAHMS

View in:

ADS Abstract Service

reference search212 citations

Citations per year

Abstract: (arXiv)

The first measurements of

x_F

-dependent single spin asymmetries of identified charged hadrons,

\pi^{\pm}

,

K^{\pm}

, and protons, from transversely polarized proton-proton collisions at 62.4 GeV at RHIC are presented. The measurements extend to high-

x_F

(

|x_F|\sim 0.6

) in both the forward and backward directions.Large asymmetries are seen in the pion and kaon channels. The asymmetries in inclusive

\pi^{+}

production,

A_N(\pi^+)

, increase with

x_F

from 0 to

\sim

0.25 %at

x_F = 0.6

and

A_N(\pi^{-})

decrease from 0 to

\sim

-

0.4. Even though

K^-

contains no valence quarks, observed asymmetries for

K^-

unexpectedly show positive values similar to those for

K^+

, increasing with

x_F

, whereas proton asymmetries are consistent with zero over the measured kinematic range. Comparisons of the data with predictions of QCD-based models are presented. The flavor dependent single spin asymmetry measurements of identified hadrons allow for stringent tests of theoretical models of partonic dynamics in the RHIC energy regime.

Note:

5 pages, 5 figures. 36 authors. Submitted to Physical Review Letters

13.85.Ni
13.88.+e
12.38.Qk
p p: colliding beams
p p: inclusive reaction
polarized beam: transverse
hadron: hadroproduction
spin: asymmetry
analyzing power
x-dependence

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