"Figure 6" of "Cross section and double helicity asymmetry for eta mesons and their comparison to neutral pion production in p+p collisions at sqrt(s)=200 GeV"
メタデータ
- 公開日
- 2023-01-01
- DOI
-
- 10.17182/hepdata.141644.v1/t3
- 公開者
- HEPData
- データ作成者 (e-Rad)
-
- PHENIX Collaboration
説明
Measurements of double helicity asymmetries in inclusive hadron production in polarized $p + p$ collisions are sensitive to helicity-dependent parton distribution functions, in particular to the gluon helicity distribution, ∆g. This study focuses on the extraction of the double helicity asymmetry in $\eta$ production ($\vec{p}+\vec{p}$ → $\eta+X$), the $\eta$ cross section and the $\eta/\pi^0$ cross section ratio. The cross section and ratio measurements provide essential input for the extraction of fragmentation functions that are needed to access the helicity-dependent parton distribution functions.
Double helicity asymmetry for midrapidity inclusive $\eta$ production from the combined 2005 and 2006 data at $\sqrt{s}$ = 200 GeV as a function of $p_T$. An additional 4.8% systematic uncertainty in the beam polarizations is not shown.