论文标题
$ d^{0} $ - 梅森生产的重组机制和$ d^{0} \！ - \！\！
Recombination mechanism for $D^{0}$-meson production and $D^{0}\!-\!\bar{D^{0}}$ production asymmetry in the LHCb $p\!+\!\!^{20}\!N\!e$ fixed-target experiment
论文作者
论文摘要
我们讨论了BJM重组模型框架中LHC（固定目标模式）中质子质子碰撞中中性$ D $介子的生产。我们提出了$ D $介子的速度和横向动量分布，并将重组贡献与主要的Gluon-Gluon融合机制进行了比较。包括矩阵元素决定的直接生产以及相关的$ c $或$ \ bar c $的碎片。后一种机制产生的$ D $介子的速度比直接产生的机制较小。我们计算$ d^0+{\ bar d^{0}} $ meson分布与固定目标$ p \！+\！\！ $ \ sqrt {s} $ = 69 GEV。重组成分与LHCB数据一致，另外导致生产不对称性。讨论了$ d^{0} \！ - \！\ bar {d^{0}} $生产作为速度和横向动量的函数的函数，并讨论了直接生产和相关$ c/{\ bar c} $碎片的术语的取消。
We discuss production of neutral $D$ mesons in proton-proton collisions at the LHC (fixed target mode) in the framework of the BJM recombination model. We present rapidity and transverse momentum distributions of $D$ mesons and compare the recombination contribution to the dominant gluon-gluon fusion mechanism. Both the direct production, as dictated by the matrix element, and fragmentation of the associated $c$ or $\bar c$ are included. The latter mechanism generates $D$ mesons with smaller rapidities than those produced directly. We calculate the $D^0 + {\bar D^{0}}$ meson distributions relevant for fixed target $p\!+\!\!^{4}\!H\!e$ collisions at $\sqrt{s}$ = 86.6 GeV as well as for $p\!+\!\!^{20}\!N\!e$ collisions at $\sqrt{s}$ = 69 GeV. The recombination component is consistent with the LHCb data and in addition results in production asymmetry. The asymmetries in $D^{0}\!-\!\bar{D^{0}}$ production as a function of rapidity and transverse momentum are shown and the cancellation of terms for direct production and associated $c/{\bar c}$ fragmentation is discussed.
