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

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dc.creatorBRAHMS Collaboration
dc.creatorArsene, I.
dc.date2008-01-07
dc.date2008-07-23
dc.date.accessioned2026-07-07T11:55:03Z
dc.date.available2026-07-07T11:55:03Z
dc.descriptionThe first measurements of $x_F$-dependent single spin asymmetries of identified charged hadrons, $π^{\pm}$, $K^{\pm}$, 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 $π^{+}$ production, $A_N(π^+)$, increase with $x_F$ from 0 to $\sim$0.25 %at $x_F = 0.6$ and $A_N(π^{-})$ 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.
dc.description4 pages, 5 figures. 36 authors. Published version in PRL
dc.identifierhttps://arxiv.org/abs/0801.1078
dc.identifierhttp://arxiv.org/abs/0801.1078
dc.identifierPhys.Rev.Lett.101:042001,2008
dc.identifierdoi:10.1103/PhysRevLett.101.042001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/205124
dc.subjectNuclear Experiment
dc.subjectHigh Energy Physics - Experiment
dc.titleSingle Transverse Spin Asymmetries of Identified Charged Hadrons in Polarized p+p Collisions at $\sqrt{s}$ = 62.4 GeV
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