arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新，休息一下吧，周末愉快~~
arXiv 0905.1453hep-phhep-exnucl-exnucl-th
收藏

新的二到三硬强子过程和在强子装置上对广义部分子分布的可能研究

Novel two-to-three hard hadronic processes and possible studies of generalized parton distributions at hadron facilities

S. Kumano, M. Strikman, K. Sudoh

备注：
19 pages, LaTeX, 17 eps files, Phys. Rev. D in press
发表信息：
Phys.Rev.D80:074003,2009
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

考虑一类新的硬分支强子过程a+b->c+d+e，其中强子c和d具有大的几乎相反的横动量和大的不变能量，它是总不变能量的有限部分.我们用色透明逻辑论证了这些过程可以用来研究强子碰撞中重子和介子的夸克广义部分子分布，从而补充和增加了对深度非弹性散射过程中夸克广义部分子分布的研究.我们建议，一些GPD可以在强子设施，如J-PARC（日本质子加速器研究综合体）设施和GSI-FAIR（Gesellschaft fur Schwerionenforschung -设施反质子和离子研究）项目进行调查。本文研究了反应N+N->N+pi+B中核子和N->Delta跃迁的GPD，其中N，pi和B分别是核子，π和重子（核子或Delta），B（或pi）和入射核子之间有大的动量转移.特别地，GPD的Efremov-Radyushkin-Brodsky-Lepage（ERBL）区域可以在这样的排他性反应中测量。我们估计的截面的过程N+N->N+ π +B通过使用现有的模型相关的GPD和大角度π N反应的信息。我们发现在高能强子装置上测量这些截面是可行的，并且可以获得关于核子结构的新信息，例如夸克轨道角动量对核子自旋的贡献。N->Delta跃迁GPD的研究对研究跃迁的电磁性质也有价值。

英文摘要：

We consider a novel class of hard branching hadronic processes a+b->c+d+e, where hadrons c and d have large and nearly opposite transverse momenta and large invariant energy which is a finite fraction of the total invariant energy. We use color transparency logic to argue that these processes can be used to study quark generalized parton distributions (GPDs) for baryons and mesons in hadron collisions hence complementing and adding to the studies of GPDs in the exclusive DIS (deep inelastic scattering) processes. We propose that a number of GPDs can be investigated in hadron facilities such as J-PARC (Japan Proton Accelerator Research Complex) facility and GSI-FAIR (Gesellschaft fur Schwerionenforschung -Facility for Antiproton and Ion Research) project. In this work, the GPDs for the nucleon and for the N->Delta transition are studied in the reaction N+N->N+pi+B, where N, pi, and B are a nucleon, a pion, and a baryon (nucleon or Delta), respectively, with a large momentum transfer between B (or pi) and the incident nucleon. In particular, the Efremov-Radyushkin-Brodsky-Lepage (ERBL) region of the GPDs can be measured in such exclusive reactions. We estimate the cross section of the processes N+N->N+pi+B by using current models for relevant GPDs and information about large angle pi N reactions. We find that it will be feasible to measure these cross sections at the high-energy hadron facilities, and get novel information about the nucleon structure, for example, contributions of quark orbital angular momenta to the nucleon spin. The studies of N->Delta transition GPDs could be valuable also for investigating electromagnetic properties of the transition.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑