Probing nuclear effects with neutrino-induced charged-current neutral pion production

Probing nuclear effects with neutrino-induced charged-current neutral pion production
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利用中微子诱导的带电电流中性介子产生来探测核效应

DOI:
10.1103/physrevd.102.072007
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发表时间:
2020
期刊:
影响因子:
5
通讯作者:
Bodek, A.
Bodek, A.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Coplowe, D.;Altinok, O.;Ahmad Dar, Z.;Akbar, F.;Andrade, D. A.;Barr, G. D.;Bashyal, A.;Bercellie, A.;Betancourt, M.;Bodek, A.

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我们使用完全成像的末态质子系统的事件研究了中微子在碳核上诱导的荷电(CC)的产生。基于横向运动学不平衡的末态关联的新应用使得能够首次测量被撞击的核子的费米运动、核内动量转移(IMT)动力学以及中微子介子产生中的末态强子动量组态。给出了(I)中微子在费米面以下的动量,(Ii)表征IMT强度的丢失横向动量的方向,以及(Iii)质子-π动量相对于轻子散射面的不平衡的事件分布。将观测到的费米运动和IMT强度与以前中微子CC类准弹性产生的测量结果进行了比较。这些分布的测量形状和绝对速率,以及截面不对称性,显示出与当前中微子产生器模型的预测相一致的张力。
We study neutrino-induced charged-current (CC)production on carbon nuclei using events with fully imaged final-state proton-systems. Novel use of final-state correlations based on transverse kinematic imbalance enables the first measurements of the struck nucleon’s Fermi motion, of the intranuclear momentum transfer (IMT) dynamics, and of the final-state hadronic momentum configuration in neutrino pion production. Event distributions are presented for (i) the momenta of neutrino-struck neutrons below the Fermi surface, (ii) the direction of missing transverse momentum characterizing the strength of IMT, and (iii) proton-pion momentum imbalance with respect to the lepton scattering plane. The observed Fermi motion and IMT strength are compared to the previousmeasurement of neutrino CC quasielastic-like production. The measured shapes and absolute rates of these distributions, as well as the cross section asymmetries, show tensions with predictions from current neutrino generator models.
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