论文标题
在400 GEV的P-A碰撞中，光中性介子产生的核依赖性与Na60
Nuclear dependence of light neutral meson production in p-A collisions at 400 GeV with NA60
论文作者
论文摘要
NA60实验研究了使用CERN SPS的400 GEV质子束，研究了质子核碰撞中的低质量雄性对产生。 $ρ/ω$和$ ϕ $介子的横向动量光谱在整个$ p_ \ mathrm {t} $ rangable中可访问，从$ p_ \ mathrm {t} = 0 $ for 2 gev/$ c $。 $η$，$ω$和$ ϕ $梅森的生产交叉部分的核依赖性与Power Law $σ_\ Mathrm {pa} \ propto \ Mathrm {A}^α$一致$α_η\大约α_ϕ>α_Ω$。横截面比率$σ_η/σ_Ω$，$σ_ρ/σ_Ω$和$σ_DA/σ_Ω$是根据生产目标A大小A的函数研究的，并且相对于$η$和$ ϕ $的增加，相对于$ω$的增加，从P-BE到P-BE碰撞。
The NA60 experiment has studied low-mass muon pair production in proton-nucleus collisions with a system of Be, Cu, In, W, Pb and U targets, using a 400 GeV proton beam at the CERN SPS. The transverse momentum spectra of the $ρ/ω$ and $ϕ$ mesons are measured in the full $p_\mathrm{T}$ range accessible, from $p_\mathrm{T} = 0$ up to 2 GeV/$c$. The nuclear dependence of the production cross sections of the $η$, $ω$ and $ϕ$ mesons has been found to be consistent with the power law $σ_\mathrm{pA} \propto \mathrm{A}^α$, with the $α$ parameter increasing as a function of $p_\mathrm{T}$ for all the particles, and an approximate hierarchy $α_η\approx α_ϕ> α_ω$. The cross section ratios $σ_η/σ_ω$, $σ_ρ/σ_ω$ and $σ_ϕ/σ_ω$ have been studied as a function of the size A of the production target, and an increase of the $η$ and $ϕ$ yields relative to the $ω$ is observed from p-Be to p-U collisions.
