We propose a new procedure for parton-to-hadron fragmentation in proton–proton collisions. The hadronization is considered in the parton-parton center-of-mass (CM) system and hadrons are assumed to be emitted in the direction of outgoing partons in that frame and then their four-momenta are transformed to the overall CM system using relevant Lorentz transformations and appropriate distributions are constructed. For heavy hadron production the energy–momentum condition is imposed. In many cases our procedure disagrees with the commonly used rule that rapidity of produced hadron is the same as rapidity of the parent parton. We illustrate the newly proposed scheme for production of D mesons, Λ _c baryon and η _c quarkonium in leading-order approach to parton production. The transverse momentum, rapidity and Feynman-x _F distributions are shown. We consider c → D and g → D as well as c → η _c and g → η _c hadronization processes. The resulting x _F distributions are much narrower than those obtained in the traditional approach with parton–hadron rapidity equivalence. This has consequences both for mid- and forward rapidities and could have consequences for high-energy neutrino production in the Earth’s atmosphere. We discuss also and fragmentation and find that the second mechanism could be partly responsible for the enhanced production of observed recently by the ALICE collaboration.

我们提出了一种在质子 - 质子碰撞中部分子到强子碎裂的新程序。在parton-parton质心（CM）系统中考虑了强子化，并且假设强子在该帧中的输出parton的方向上发射，然后使用相关的洛伦兹将它们的四动量转换为整个CM系统构造变换和适当的分布。对于重强子的产生，强加了能量-动量条件。在许多情况下，我们的程序不同意产生强子的速度与母体的速度相同的常用规则。我们说明了新提出的产生D介子、Λ _c重子和η _{c 的方案} quarkonium 在parton 生产的领先顺序方法中。显示了横向动量、速度和 Feynman- x _F分布。我们考虑c → D和g → D以及c → η _c和g → η _c强子化过程。由此产生的x _F分布比在具有部分子-强子速度等价的传统方法中获得的分布要窄得多。这对中速和前速都会产生影响，并可能对地球大气中的高能中微子产生产生影响。我们也讨论 和碎片化，并发现第二种机制可能是ALICE 合作最近观察到的增强生产的部分原因。