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arXiv 1502.01704hep-phhep-ex
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中微子-中性流相互作用中低能光子的产生

Low-energy photon production in neutrino neutral-current interactions

Jonathan L. Rosner

备注：
8 pages, 1 figure. Version with significant further revisions submitted to Phys. Rev. D
发表信息：
Phys. Rev. D 91, 093001 (2015)
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摘要：

费米实验室的MiniBooNE协作组对$ν_μ\to ν_e$振荡的研究揭示了一个低能量信号，它可能是由于$ν_e$产生的电子，也可能是由于弱中性电流与靶核相互作用产生的光子。对后者的一个贡献是Wess-Zumino-Witten异常导致拉格朗日量中的一项与$ε^{μνκλ} Z_μω_νF_{κλ}$成比例。该项借助于过程$f_1 \to ργ$和$τ\to ν_τa_1$的已知速率进行归一化。得到的速率约为以前几次估计中所用速率的1/4。由于已经发现异常项在光子产生中起次要作用（例如，与$Δ$激发和衰减相比），本估计甚至进一步降低了其强度。

英文摘要：

The search for $ν_μ\to ν_e$ oscillations by the MiniBooNE Collaboration at Fermilab has revealed a low-energy signal which could be due either to electrons produced by $ν_e$ or photons produced by the interaction of the weak neutral current on the target nucleus. One contribution to the latter is a Wess-Zumino-Witten anomaly leading to a term in the Lagrangian proportional to $ε^{μνκλ} Z_μω_νF_{κλ}$. This term is normalized with the help of the known rates for the processes $f_1 \to ργ$ and $τ\to ν_τa_1$. A rate of about 1/4 of that employed in several previous estimates is obtained. As the anomaly term had already been found to play a subdominant role in photon production (e.g., in comparison with $Δ$ excitation and decay), the present estimate reduces its strength even further.

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