Title: Flavor, transverse momentum, and azimuthal dependence of charged pion multiplicities in SIDIS with 10.6 GeV electrons Show Chinese title

Title: 带电π介子多重性在10.6 GeV电子的SIDIS中的味、横向动量和方位角依赖性

Abstract: Measurements of SIDIS multiplicities for $\pi^+$ and $\pi^-$ from proton and deuteron targets are reported on a grid of hadron kinematic variables $z$, $P_{T}$, and $\phi^{*}$ for leptonic kinematic variables in the range $0.3<x<0.6$ and $3<Q^2<5$ GeV$^2$. Data were acquired in 2018-2019 at Jefferson Lab Hall C with a 10.6~GeV electron beam impinging on 10-cm-long liquid hydrogen and deuterium targets. Scattered electrons and charged pions were detected in the HMS and SHMS spectrometers, respectively. The multiplicities were fitted for each bin in $(x,~Q^2,~z,~P_{t})$ to extract the $\phi^{*}$ independent $M_0$ and the azimuthal modulations $\langle \cos(\phi^{*}) \rangle$ and $\langle \cos(2\phi^{*}) \rangle$. The $P_t$-dependence of the $M_0$ results was found to be remarkably consistent for the four cases studied: $ep\rightarrow e \pi^+ X$, $ep\rightarrow e \pi^- X$, $ed\rightarrow e \pi^+ X$, $ed\rightarrow e \pi^- X$ over the range $0<P_t<0.4$ GeV, as were the multiplicities evaluated near $\phi^* = 180^\circ$ over the extended range $0<P_t<0.7$ GeV. The Gaussian widths of the $P_t$-dependence exhibit a quadratic increase with $z$. The $\cos(\phi^{*})$ modulations were found to be consistent with zero for $\pi^+$, in agreement with previous world data, while the $\pi^-$ moments were, in many cases, significantly greater than zero. The $\cos(2\phi^{*})$ modulations were found to be consistent with zero. The higher statistical precision of this dataset compared to previously published data should allow improved determinations of quark transverse momentum distributions and higher twist contributions. Show Chinese abstract

Abstract: 质子和氘核靶上$\pi^+$和$\pi^-$的SIDIS多重性测量结果在介子运动学变量$z$、$P_{T}$和$\phi^{*}$的网格上报告，对于电子运动学变量在范围$0.3<x<0.6$和$3<Q^2<5$GeV$^2$。 数据于2018-2019年在杰斐逊实验室大厅C获取，使用10.6 GeV电子束照射10厘米长的液态氢和氘靶。散射电子和带电介子分别在HMS和SHMS光谱仪中被探测。对于每个bin中的$(x,~Q^2,~z,~P_{t})$，拟合了多重性以提取$\phi^{*}$独立的$M_0$以及方位调制$\langle \cos(\phi^{*}) \rangle$和$\langle \cos(2\phi^{*}) \rangle$。 $P_t$依赖性的$M_0$结果在所研究的四种情况下表现出显著的一致性：$ep\rightarrow e \pi^+ X$、$ep\rightarrow e \pi^- X$、$ed\rightarrow e \pi^+ X$、$ed\rightarrow e \pi^- X$在$0<P_t<0.4$GeV 范围内，以及在扩展范围$0<P_t<0.7$GeV 内接近$\phi^* = 180^\circ$处评估的多重性。 高斯宽度的$P_t$依赖性随着$z$呈二次增加。 $\cos(\phi^{*})$调制在$\pi^+$情况下被发现与零一致，这与之前的世界数据一致，而$\pi^-$矩在许多情况下明显大于零。 $\cos(2\phi^{*})$调制被发现与零一致。 与之前发表的数据相比，该数据集的更高统计精度应允许对夸克横向动量分布和高阶扭曲贡献进行更精确的确定。