arXiv 1608.021032016-08hep-ph

反中微子-核子反应中极化超子的准弹性产生

Quasielastic production of polarized hyperons in antineutrino--nucleon reactions

F. Akbar, M. Rafi Alam, M. Sajjad Athar, S. K. Singh

备注：: 23 Pages, 23 Figures
发表信息：: Phys. Rev. D 94, 114031 (2016)
DOI：: 10.1103/PhysRevD.94.114031

摘要：

本文研究了反中微子与核子和核靶的准弹性荷电反应中产生的末态超子（$Λ$，$Σ$）的微分截面以及极化的纵向和垂直分量。在假设G不变性、T不变性和SU（3）对称性的条件下，由准弹性$(ΔS =0)$荷电（反）中微子-核子散射和中子、超子半轻子衰变的实验数据确定了核子-超子跃迁形状因子.矢量跃迁形状因子是根据核子电磁形状因子得到的，其中各种参数化可在文献中得到。采用偶极参数化的轴向矢量形状因子和赝标跃迁形状因子的轴向矢量形状因子假设PCAC和GT关系扩展到奇异扇区已被用于数值计算。本文计算了CERN Gargamelle实验中超子产生的通量平均截面和极化观测值，与实验结果符合较好。给出了与MINER $ν$ A、MicroBooNE和T2 K实验的反中微子通量相关的通量平均微分截面$\frac{dσ}{dQ^2}$和纵向（垂直）极化$P_L(Q^2)(P_P(Q^2))$的数值结果。这将有助于解释反中微子诱导超子的准弹性产生实验中的产生截面和极化观测值的未来实验结果，并探索确定奇异扇区中的轴矢量和赝标形状因子的可能性。

英文摘要：

We have studied the differential cross section as well as the longitudinal and perpendicular components of polarization of final hyperon($Λ$,$Σ$) produced in the antineutrino induced quasielastic charged current reactions on nucleon and nuclear targets. The nucleon-hyperon transition form factors are determined from the experimental data on quasielastic $(ΔS =0)$ charged current (anti)neutrino--nucleon scattering and the semileptonic decay of neutron and hyperons assuming G--invariance, T--invariance and SU(3) symmetry. The vector transition form factors are obtained in terms of nucleon electromagnetic form factors for which various parameterizations available in literature have been used. A dipole parameterization for the axial vector form factor and the pseudoscalar transition form factor derived in terms of axial vector form factor assuming PCAC and GT relation extended to strangeness sector have been used in numerical evaluations. The flux averaged cross section and polarization observables corresponding to CERN Gargamelle experiment have been calculated for quasielastic hyperon production and found to be in reasonable agreement with the experimental observations. The numerical results for the flux averaged differential cross section$\frac{dσ}{dQ^2}$ and longitudinal(perpendicular) polarization $P_L(Q^2)(P_P(Q^2))$ relevant for the antineutrino fluxes of MINER$ν$A, MicroBooNE, and T2K experiments have been presented. This will be useful in interpreting future experimental results on production cross sections and polarization observables from the experiments on the quasielastic production of hyperons induced by antineutrinos and explore the possibility of determining the axial vector and pseudoscalar form factors in the strangeness sector.

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