首次测量单能中微子带电电流相互作用中核效应导致的失踪能量

E. Marzec, S. Ajimura, A. Antonakis, M. Botran, M. K. Cheoun, J. H. Choi, J. W. Choi, J. Y. Choi, T. Dodo, H. Furuta, J. H. Goh, K. Haga, M. Harada, S. Hasegawa, Y. Hino, T. Hiraiwa, W. Hwang, T. Iida, E. Iwai, S. Iwata, H. I. Jang, J. S. Jang, M. C. Jang, H. K. Jeon, S. H. Jeon, K. K. Joo, D. E. Jung, S. K. Kang, Y. Kasugai, T. Kawasaki, E. J. Kim, J. Y. Kim, E. M. Kim, S. Y. Kim, W. Kim, S. B. Kim, H. Kinoshita, T. Konno, K. Kuwata, D. H. Lee, S. Lee, I. T. Lim, C. Little, T. Maruyama, S. Masuda, S. Meigo, S. Monjushiro, D. H. Moon, T. Nakano, M. Niiyama, K. Nishikawa, M. Noumachi, M. Y. Pac, B. J. Park, H. W. Park, J. B. Park, J. S. Park, J. S. Park, R. G. Park, S. J. M. Peeters, G. Roellinghoff, C. Rott, J. W. Ryu, K. Sakai, S. Sakamoto, T. Shima, C. D. Shin, J. Spitz, I. Stancu, F. Suekane, Y. Sugaya, K. Suzuya, M. Taira, Y. Takeuchi, W. Wang, J. Waterfield, W. Wei, R. White, Y. Yamaguchi, M. Yeh, I. S. Yeo, C. Yoo, I. Yu, A. Zohaib
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Zohaib","doi":"arxiv-2409.01383","DOIUrl":null,"url":null,"abstract":"We present the first measurement of the missing energy due to nuclear effects\nin monoenergetic, muon neutrino charged-current interactions on carbon,\noriginating from $K^+ \\rightarrow \\mu^+ \\nu_\\mu$ decay-at-rest\n($E_{\\nu_\\mu}=235.5$ MeV), performed with the JSNS$^2$ liquid scintillator\nbased experiment. 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引用次数: 0

摘要

我们首次测量了碳上单能μ介子中微子带电电流相互作用中由于核效应而缺失的能量,这些能量来自于静止状态下的$K^+ \rightarrow \mu^+ \nu_\mu$ 衰变($E_{\nu_\mu}=235.5$ MeV),是用基于JSNS$^2$液体闪烁体的实验进行的。为了描述中微子相互作用的特征,表面上$\{nu_\mu n \rightarrow \mu^- p$或$\{nu_\mu$$^{12}\mathrm{C}$ $\rightarrow\mu^-$$^{12}\mathrm{N}$,并类比于类似的基于电子散射的测量、我们将缺失能量定义为转移到原子核的能量($\omega$)减去流出质子的动能,即 $E_{m}\equiv \omega-\sum T_p$,并将其与探测器中的可见能量联系起来,即 $E_{m}=E_{\nu_\mu}~(235.在没有核效应(如核子分离能、费米矩和终态相互作用)的情况下,缺失的能量被天真地认为是零,但它对相互作用的许多方面都具有独特的敏感性,而且以前中微子是无法获取的。所报告的纯形状、差分截面测量是基于一个 $(77\pm3)$% 的双重合 KDAR 信号(共 621 个事件),为 100s-of-MeV 中微子能量下的模型和事件发生器提供了一个重要的基准,其特点是中微子-核子散射和中微子-核子散射之间的过渡区域难以建模,并且与核物理、中微子振荡测量和 II 型超新星研究中的应用相关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
First Measurement of Missing Energy Due to Nuclear Effects in Monoenergetic Neutrino Charged Current Interactions
We present the first measurement of the missing energy due to nuclear effects in monoenergetic, muon neutrino charged-current interactions on carbon, originating from $K^+ \rightarrow \mu^+ \nu_\mu$ decay-at-rest ($E_{\nu_\mu}=235.5$ MeV), performed with the JSNS$^2$ liquid scintillator based experiment. Towards characterizing the neutrino interaction, ostensibly $\nu_\mu n \rightarrow \mu^- p$ or $\nu_\mu$$^{12}\mathrm{C}$ $\rightarrow \mu^-$$^{12}\mathrm{N}$, and in analogy to similar electron scattering based measurements, we define the missing energy as the energy transferred to the nucleus ($\omega$) minus the kinetic energy of the outgoing proton(s), $E_{m} \equiv \omega-\sum T_p$, and relate this to visible energy in the detector, $E_{m}=E_{\nu_\mu}~(235.5~\mathrm{MeV})-m_\mu~(105.7~\mathrm{MeV}) - E_{vis}$. The missing energy, which is naively expected to be zero in the absence of nuclear effects (e.g. nucleon separation energy, Fermi momenta, and final-state interactions), is uniquely sensitive to many aspects of the interaction, and has previously been inaccessible with neutrinos. The shape-only, differential cross section measurement reported, based on a $(77\pm3)$% pure double-coincidence KDAR signal (621 total events), provides an important benchmark for models and event generators at 100s-of-MeV neutrino energies, characterized by the difficult-to-model transition region between neutrino-nucleus and neutrino-nucleon scattering, and relevant for applications in nuclear physics, neutrino oscillation measurements, and Type-II supernova studies.
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