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arXiv 2203.00848hep-phhep-exhep-latnucl-exnucl-th
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中微子反应中广义部分子分布和引力形状因子的可能研究

Possible studies on generalized parton distributions and gravitational form factors in neutrino reactions

S. Kumano, R. Petti

摘要:

研究了带电轻子散射和正负电子碰撞中的类空广义部分子分布和类时广义部分子分布。此外,我们预计强子加速器设施的测量将在未来进行。GPD将在澄清强子自旋和质量的夸克和胶子起源方面发挥关键作用。也可以探测强子内部的压力来了解它们的稳定性。强子的引力形状因子过去被认为是一个纯粹的学术课题,因为引力相互作用太弱,无法在微观系统中测量。然而,由于强子层析成像领域的发展,它成为可能,提取的重力形状因子从实际的GPD测量,而不依赖于直接的引力相互作用。中微子反应也可以在未来用于GPD研究,例如,通过使用费米实验室的长基线中微子设施。中微子GPD的测量是有价值的,特别是在一个补充的方式来发现的GPD的味道依赖的带电轻子实验。我们给出了一个概述的GPD和讨论可能的中微子GPD测量使用的单π生产过程$ν+ N \to \ell^- + N' + π$和$\barν+ N \to \ell^+ + N' + π$。

英文摘要:

Spacelike and timelike generalized parton distributions (GPDs) have been investigated in charged-lepton scattering and electron-positron collisions via deeply virtual Compton scattering and two-photon processes, respectively. Furthermore, we expect that hadron-accelerator-facility measurements will be performed in future. The GPDs will play a crucial role in clarifying the origins of hadron spins and masses in terms of quarks and gluons. It is also possible to probe internal pressure within hadrons for understanding their stability. Gravitational form factors of hadrons used to be considered as a purely academic subject because gravitational interactions are too weak to be measured in microscopic systems. However, due to the development of hadron-tomography field, it became possible to extract the gravitational form factors from the actual GPD measurements without relying on direct gravitational interactions. Neutrino reactions can also be used for GPD studies in future, for example, by using the Long-Baseline Neutrino Facility at Fermilab. The neutrino GPD measurements are valuable especially for finding the flavor dependence of the GPDs in a complementary way to the charged-lepton experiments. We give an overview of the GPDs and discuss possible neutrino GPD measurements using the single-pion production processes $ν+ N \to \ell^- + N' + π$ and $\barν+ N \to \ell^+ + N' + π$.

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