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arXiv 0910.2835nucl-thhep-exhep-ph
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中微子与原子核相互作用中π介子的产生

Pion production in neutrino interactions with nuclei

T. Leitner, O. Lalakulich, O. Buss, U. Mosel, L. Alvarez-Ruso

摘要:

中微子在核靶上产生π介子是目前中微子振荡实验的主要非弹性通道。为了能够在MiniBooNE或K2 K和T2 K等实验中重建中微子能量,必须定量地理解它。我们在这里报告的截面计算结果,这个通道和准弹性散射的半经典GiBUU方法。这种方法包含散射,弹性和非弹性,吸收和侧馈的渠道都在一个单一的,共同的理论框架和代码。我们发现,在实际实验中,由于散射核子的终态相互作用以及$Δ$共振和π介子的终态相互作用,荷电准弹性散射(CCQE)和$1 π$的产生是紧密纠缠的.本文讨论了由ANL和BNL得到的基本π介子产生截面的不确定性。我们发现令人惊讶的结果,最近的$1 π$生产截面数据从MiniBooNE很好地描述了计算没有任何FSI。对于更高的能量,我们研究了电子和中微子诱导反应的布卢姆吉尔曼夸克强子对偶性的有效性。虽然这种对偶性对于核子靶很好地保持,但是对于核靶,结构函数$F_2$的平均共振贡献总是低于DIS值。这一结果表明核效应对可观测量的显著影响,使截面和结构函数至少减少30-40%,并改变了各种分布的形式。

英文摘要:

Neutrino-induced pion production on nuclear targets is the major inelastic channel in all present-day neutrino-oscillation experiments. It has to be understood quantitatively in order to be able to reconstruct the neutrino-energy at experiments such as MiniBooNE or K2K and T2K. We report here results of cross section calculations for both this channel and for quasielastic scattering within the semiclassical GiBUU method. This methods contains scattering, both elastic and inelastic, absorption and side-feeding of channels all in a unitary, common theoretical framework and code. We find that charged current quasielastic scattering (CCQE) and $1 π$ production are closely entangled in actual experiments, due to final state interactions of the scattered nucleons on one hand and of the $Δ$ resonances and pions, on the other hand. We discuss the uncertainties in the elementary pion production cross sections from ANL and BNL. We find the surprising result that the recent $1 π$ production cross section data from MiniBooNE are well described by calculations without any FSI. For higher energies we study the validity of the Bloom-Gilman quark-hadron duality for both electron- and neutrino-induced reactions. While this duality holds quite well for nucleon targets, for nuclear targets the average resonance contributions to the structure function $F_2$ are always lower than the DIS values. This result indicates a significant impact of nuclear effects on observables, reducing the cross section and structure functions by at least 30-40% and changing the form of various distributions.

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。

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