Single Transverse Spin Asymmetries of Identified Charged Hadrons in Polarized p+p Collisions at $\sqrt{s}$ = 62.4 GeV

Abstract

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.

arXiv comment4 pages, 5 figures. 36 authors. Published version in PRL

References in corpus (14)

• Fragmentation of Transversely Polarized Quarks Probed in Transverse Momentum Distributions
• Single Transverse-Spin Asymmetries in Hadronic Pion Production
• Fragmentation Functions from Flavour-inclusive and Flavour-tagged e^+e^- Annihilations
• Cross Sections and Transverse Single-Spin Asymmetries in Forward Neutral-Pion Production from Proton Collisions at \sqrt{s} = 200 GeV
• A new measurement of the Collins and Sivers asymmetries on a transversely polarised deuteron target
• Next-to-leading order QCD corrections to high-p_T pion production in longitudinally polarized pp collisions
• Single transverse-spin asymmetry in high transverse momentum pion production in pp collisions
• Testing the Universality of Fragmentation Functions
• Parton intrinsic motion in inclusive particle production: unpolarized cross sections, single spin asymmetries and the Sivers effect
• Single spin asymmetries in transversely polarized proton(antiproton) - proton inclusive processes
• Production of Mesons and Baryons at High Rapidity and High Pt in Proton-Proton Collisions at sqrt(s) = 200 GeV
• Polarized Structure Functions in QCD
• Do we understand the single-spin asymmetry for $p{i}^0$ inclusive production in pp collisions?
• The BRAHMS ring imaging Cherenkov detector

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