D. Pocanic
We review the recent measurements of the rare pion decays: Pi+ -> Pi0 e+ Nu [pion beta, Pi_(e3), or Pi_beta decay], radiative decay Pi+ -> e+ Nu Gamma [Pi_(e2Gamma) or RPD], and Pi+ -> e+ Nu [Pi_(e2)] decay, as well as the radiative muon decay, Mu -> e Nu Nu-bar Gamma, their theoretical implications, and prospects for further improvement.
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There exists a longstanding disagreement between bubble chamber measurements of the single pion production channel $ν_μp\rightarrow μ^{-}pπ^{+}$ from the Argonne and Brookhaven National Laboratories. We digitize and reanalyse data from both experiments to produce cross-section ratios for various interaction channels, for which the flux uncertainties cancel, and find good agreement between the experiments. By multiplying the cross-section ratio by the well-understood charged current quasi-elastic cross-section on free nucleons, we extract single-pion production cross-sections which do not depen…
Simple dynamics, few available decay channels, and extremely well controlled radiative and loop corrections, make pion and muon decays a sensitive means for testing the underlying symmetries, the universality of weak fermion couplings, as well as for study of pion structure and chiral dynamics. We review the current state of experimental study of the allowed rare decays of charged pions: (a) electronic, $π^+ \to e^+ν_e$, or $π_{e2}$, (b) radiative, $π^+ \to e^+ν_eγ$, or $π_{e2γ}$, and (c) semileptonic, $π^+\to π^0 e^+ ν$, or $π_{e3}$, as well as muon radiative decay, $μ^+\to e^+ ν_{\text{e}}\b…
In the present work, we investigate several theoretical models of the pion vector form factor and aim at getting the best fit for the two-pion cross sections to reduce the uncertainties of the calculation of two-pion contribution to the muon anomalous magnetic moment. Combined with a polynomial description to the pion vector form factor, we obtain the best fit from the Gounaris-Sakurai (or Kühn-Santamaria) model for the experimental data up to 1 GeV. By product, the branching ratio of $ω\to ππ$ can be extracted as $\text{Br}(ω\toππ)=(1.52\pm 0.06) \%$, which is consistent with the one of Parti…
Heavy Neutral Leptons from Stopped Muons and Pions
本研究利用静止π介子实验中的静止μ子，探索重中性轻子的未探索参数空间，重新分析LSND实验的ν-e散射数据，得出其对混合角平方的限制强于以往一个数量级以上，并指出PIP2-BD等未来实验有望进一步提升灵敏度。
We calculate the charged current cross sections obtained at the T2K near detector for $ν_μ$-induced events without pions in the final state. The method used is quantum-kinetic transport theory. Results are shown first, as a benchmark, for electron inclusive cross sections on $^{12}$C and $^{16}$O to be followed with a detailed comparison with the data measured by the T2K collaboration on C$_8$H$_8$ and H$_2$O targets. The contribution of 2p2h processes is found to be relevant mostly for backwards angles; their theoretical uncertainties are within the experimental uncertainties. Particular emph…
To describe low-energy (anti)neutrino fluxes in modern coherent elastic neutrino-nucleus scattering experiments as well as high-energy fluxes in precision-frontier projects such as the Enhanced NeUtrino BEams from kaon Tagging (ENUBET) and the Neutrinos from STORed Muons (nuSTORM), we evaluate (anti)neutrino energy spectra from radiative muon ($μ^- \to e^- \barν_e ν_μ(γ),~μ^+ \to e^+ ν_e \barν_μ(γ)$), pion $π_{\ell 2}$ ($π^- \to μ^- \barν_μ(γ),~π^+ \to μ^+ ν_μ(γ)$), and kaon $K_{\ell 2}$ ($K^- \to μ^- \barν_μ(γ),~K^+ \to μ^+ ν_μ(γ)$) decays. We compare detailed $\mathrm{O} \left( α\right)$ dis…
Pion and muon yields from a 10 GeV proton beam on various targets
我们目前的结果从MARS蒙特卡罗模拟接受π介子和μ介子产量时，10 GeV的抛物面质子束与固体或粉末（50%密度）钨靶的中微子工厂相互作用。我们比较这些产量与汞射流靶配置，发现它们都给出了类似的π介子生产率。还提供了对目标内π介子再吸收量的估计。
This short paper is an addendum to a recent publication on charged current neutrino-induced pion production (Phys.\ Rev.\ C96 (2017) no.1, 015503). It presents comparisons of pion production cross sections measured at the T2K near detector for a CH target.
Simple dynamics, few available decay channels, and highly controlled radiative and loop corrections, make pion and muon decays a sensitive means of exploring details of the underlying symmetries. We review the current status of the rare decays: pi+ -> e+ nu, pi+ -> e+ nu gamma, pi+ -> pi0 e+ nu, and mu+ -> e+ nu nu-bar gamma. For the latter we report new preliminary values for the branching ratio B(E_gamma >10 MeV, theta_(e-gamma) > 30deg) = 4.365 (9)_stat (42)_syst x 10^{-3}, and the decay parameter eta-bar = 0.006 (17)_stat (18)_syst, both in excellent agreement with standard model predictio…
Measurements of Pion and Muon Nuclear Capture at Rest on Argon in the LArIAT Experiment
LArIAT通过测量静止π、μ核俘获后的MeV级孤立能量沉积，实现3.6σ的π-μ鉴别，并指出现有Geant4模拟显著高估blip数。
Searching for long-lived particles from stopped pions and muons at the CiADS-BDE
本研究探索CiADS-BDE束流dump实验对源自静止π介子和μ子衰变的长寿命粒子（如重中性轻子、类轴子粒子和轻双规范玻色子）的搜索能力，发现其可探测超越现有界限的广阔参数区域。
[Background] Long-Baseline experiments such as T2K, NOvA or the planned Deep Underground Neutrino Experiment (DUNE) require theoretical descriptions of the complete event in a neutrino-nucleus reaction. Since nuclear targets are used this requires a good understanding of neutrino-nucleus interactions. [Purpose] One of the dominant reaction channels in neutrino-nucleus interactions is pion production. This paper aims for a coherent view on all charged current charged pion production data that are avaible from the experiments MiniBooNE, the near detector experiment at T2K and MINERvA. [Methods] …
T2K (Tokai to Kamioka) is a long-baseline neutrino oscillation experiment located in Japan and designed to measure neutrino flavor oscillation using an off-axis neutrino beam. Data collected recently with an anti-neutrino beam allows T2K to measure cross sections for anti-neutrinos at an energy around 600 MeV using the off-axis near detector. These measurements, along with the analogous for neutrinos, are vital inputs to neutrino oscillation analyses and their interpretation. In this work preliminary results on the simultaneous extraction of the muon neutrino and anti-neutrino charged-current …
A set of measurements of azimuthal asymmetries in the production of pairs of identified hadrons in deep-inelastic scattering of muons on transversely polarised $^6$LiD (deuteron) and NH$_3$ (proton) targets is presented. All available data collected in the years 2002-2004 and 2007/2010 with the COMPASS spectrometer using a muon beam of 160 GeV/$c$ at the CERN SPS were analysed. The asymmetries provide access to the transversity distribution functions via a fragmentation function that in principle may be independently obtained from $e^+e^-$ annihilation data. Results are presented, discussed an…
SciBooNE, located in the Booster Neutrino Beam at Fermilab, collected data from June 2007 to August 2008 to accurately measure muon neutrino and anti-neutrino cross sections on carbon below 1 GeV neutrino energy. SciBooNE is studying charged current interactions. Among them, neutral pion production interactions will be the focus of this poster. The experimental signature of neutrino-induced neutral pion production is constituted by two electromagnetic cascades initiated by the conversion of the neutral pion decay photons, with an additional muon in the final state for CC processes. In this pos…
The vector form factor of the pion from unitarity and analyticity: a model-independent approach
我们研究了一个模型无关的参数化矢量π形状因子，所产生的解析性和么正性的约束。我们的描述应该是合适的sqrt（s）~ 1.2 GeV，并允许一个独立的模型确定的质量的ρ（770）共振，M（ρ）=（775.1 +- 0.5）MeV。在这个框架下，我们分析了τ（-）-> π（-）π（0）中微子（τ）的实验数据，以及它对用手征微扰理论计算的低能观测值的影响。我们还估算了两π介子对μ子反常磁矩a_μ子和精细结构常数α（M（Z）^2）的贡献。
Hadronic light-by-light corrections to the muon g-2: the pion-pole contribution
利用QCD的大Nc和短距离性质，通过描述π 0- gamma* - gamma* 跃迁的形状因子，考虑了π极对强子光-光散射的贡献对μ子反常磁矩的修正.由此产生的两个回路积分的处理，首先进行角积分解析，使用的方法Gegenbauer多项式，然后由数值计算剩余的二维积分的模的欧几里得回路动量。得到的值a_{mu}（LbyL; pi 0）= +5.8（1.0）× 10^{-10}，与最近的其他计算结果不一致。在矢量介子占优势的形状因子的情况下，按照同样的程序得到的结果是a_{mu}（LbyL; pi 0）_{VMD} = +5.6 x 10^{-10}，与以前的作者得到的值的差别仅在于它的总符号。对于三个赝标态，包括η和η素极点给出总值a_{mu}（LbyL;PS）= +8.3（1.2）x 10^{-10}。该结果大大减小了a_{mu}的实验值与其在标准模型中的理论对应值之间的差异。
The two-pion contribution from low energies to the muon magnetic moment anomaly, although small, has a large relative uncertainty since in this region the experimental data on the cross sections are neither sufficient nor precise enough. It is therefore of interest to see whether the precision can be improved by means of additional theoretical information on the pion electromagnetic form factor, which controls the leading order contribution. In the present paper we address this problem by exploiting analyticity and unitarity of the form factor in a parametrization-free approach that uses the p…
We present a first model-independent calculation of $ππ$ intermediate states in the hadronic-light-by-light (HLbL) contribution to the anomalous magnetic moment of the muon $(g-2)_μ$ that goes beyond the scalar QED pion loop. To this end we combine a recently developed dispersive description of the HLbL tensor with a partial-wave expansion and demonstrate that the known scalar-QED result is recovered after partial-wave resummation. Using dispersive fits to high-statistics data for the pion vector form factor, we provide an evaluation of the full pion box, $a_μ^{π\text{-box}}=-15.9(2)\times 10^…
Search for Rare and Forbidden 3-body Di-muon Decays of the Charmed Mesons D+ and Ds+
利用Fermilab FOCUS实验中光生粲粒子的高统计样本，我们报道了八种罕见的标准模型禁戒衰变：D+，Ds+ > h+/-μ子-/+ μ子+（h= π介子或K介子）的研究结果。与以前的结果相比，改进了1.7- 14倍。在90% C. L时，我们的分支比上限D ~+ > π ~+ μ ~-μ ~+为8.8E ~（-6）。低于当前MSSM R奇偶校验违反约束。
Building on the rare pion and muon decay results of the PIBETA experiment, the PEN collaboration has undertaken a precise measurement of B_{πe2} = R^π_{e/μ}, the π^+ -> e^+ν(γ) decay branching ratio, at the Paul Scherrer Institute, to reduce the present 40\times experimental precision lag behind theory to ~ 6-7\times. Because of large helicity suppression, R^π_{e/μ} is uniquely sensitive to contributions from non-(V-A) physics, making this decay a particularly suitable subject of study. Even at current precision, the experimental value of B_{πe2} provides the most accurate test of lepton unive…
Probing the Standard Model via rare pion and muon decays
PIBETA合作使用了在Paul Scherrer研究所运行的非磁性纯CsI量热计来收集世界上最大的稀有π介子和μ介子衰变样品。在总不确定度为0.55%的条件下，提取了π + -> π 0 e+ nu衰变的绝对分支比.利用pi+ -> e + nu伽玛数据集提取了弱轴向和矢量形状因子F_A和F_V，显著提高了F_A和F_V的精度。这些结果带来了重大的改进，在目前的粒子数据组列表的准确性，并同意与标准模型的预测。
Violation of Lorentz invariance (VLI) has been suggested as an explanation of the superluminal velocities of muon neutrinos reported by OPERA. In this note we show that the amount of VLI required to explain this result poses severe difficulties with the kinematics of the pion decay, extending its lifetime and reducing the momentum carried away by the neutrinos. We show that the OPERA experiment limits $α= (v_ν- c)/c < 4 \times 10^{-6}$. We then take recourse to cosmic ray data on the spectrum of muons and neutrinos generated in the earth's atmosphere to provide a stronger bound on VLI: $(v-c)/…
Studies of the Response of the Prototype CMS Hadron Calorimeter, Including Magnetic Field Effects, to Pion, Electron, and Muon Beams
我们报告的原型CMS强子量能器模块的介子，介子和电子的动量高达375 GeV/c的带电粒子束的响应。这些数据是在1995年和1996年在CERN的H2和H4光束线上拍摄的。原型采样量热计使用铜吸收板和闪烁体瓦与波长偏移光纤读出。高达3特斯拉的磁场的量热计的μ子，电子和π介子的响应的影响，和上游的钨酸铅晶体电磁量热计的线性和能量分辨率的组合量热系统强子的影响进行了评估。结果进行了比较与蒙特卡罗模拟，并用于优化选择的总吸收体的深度，采样频率，和纵向读出分割。
Dispersive analysis of the $π^+ π^-$ production at the CMD3 experiment and the compatibility with muon pair production measurement by KLOE2 and the pion form factor by JLAB
通过两组数据提取带电$\pi$介子形状因子的谱函数，分析CMD-3最新$\pi^+\pi^-$产生数据与其他实验的不兼容性，并比较类空区域形状因子与QCD微扰分析的差异，同时利用谱函数得到QED跑动电荷并与KLOE-2测量对比。
The $π^0$ pole constitutes the lowest-lying singularity of the hadronic light-by-light (HLbL) tensor, and thus provides the leading contribution in a dispersive approach to HLbL scattering in the anomalous magnetic moment of the muon $(g-2)_μ$. It is unambiguously defined in terms of the doubly-virtual pion transition form factor, which in principle can be accessed in its entirety by experiment. We demonstrate that, in the absence of a direct measurement, the full space-like doubly-virtual form factor can be reconstructed very accurately based on existing data for $e^+e^-\to 3π$, $e^+e^-\to e^…
The two-pion low-energy contribution to the anomalous magnetic moment of the muon, $a_μ\equiv(g-2)_μ/2$, expres sed as an integral over the modulus squared of the pion electromagnetic form fac tor, brings a relatively large contribution to the theoretical error, since the low accuracy of experimental measurements in this region is amplified by the drastic increase of the integration kernel. We derive stringent constraints on the two-pion contribution by exploiting analyticity and unitarity of the pion electromagnetic form factor. To avoid the poor knowledge of the modulus of this function, we …
We revisit the isospin-breaking and electromagnetic corrections to the decay $τ^-\toπ^-π^0ν_τ$, which allow its use as input in the two-pion contribution to the (leading order) hadronic vacuum polarization part of the muon anomalous magnetic moment. We extend a previous resonance chiral Lagrangian analysis, which included those operators saturating the next-to-leading order chiral low energy constants, by including the contributions of the next subleading terms. As a result, we improve agreement between the two-pion tau decay and $e^+e^-$ data and reduce the discrepancy between experiment and …
Observed since the 1950's, the seasonal effect on underground muons is a well studied phenomenon. The interaction height of incident cosmic rays changes as the temperature of the atmosphere changes, which affects the production height of mesons (mostly pions and kaons). The decay of these mesons produces muons that can be detected underground. The production of muons is dominated by pion decay, and previous work did not include the effect of kaons. In this work, the methods of Barrett and MACRO are extended to include the effect of kaons. These efforts give rise to a new method to measure the …
I present an application of a convolutional neural network (CNN) to separate muons and pions in the Belle II electromagnetic calorimeter (ECL). The ECL is designed to measure the energy deposited by charged and neutral particles. It also provides important contributions to the particle identification (PID) system. Identification of low-momenta muons and pions in the ECL is crucial if they do not reach the outer muon detector. Track-seeded cluster energy images provide the maximal possible information. The shape of the energy depositions for muons and pions in the crystals around an extrapolate…
The Tokai to Kamioka (T2K) experiment is a 295-km long-baseline neutrino experiment aimed towards the measurement of neutrino oscillation parameters $θ_{13}$ and $θ_{23}$. Precise measurement of these parameters requires accurate knowledge of neutrino cross sections. We present a flux-averaged double differential measurement of the charged-current cross section on water with zero pions in the final state using the T2K off-axis near detector, ND280. A selection of $ν_μ$ charged- current events occurring in the Pi-Zero subdetector (PØD) of ND280 is performed with $5.8 \times 10^{20}$ protons on …
PIONEER is a next-generation experiment to measure the charged pion branching ratios to electrons vs muons $R_e/μ= \frac{Γ\left(π^+ \rightarrow e^+ ν(γ) \right)}{Γ\left(π^+ \rightarrow μ^+ ν(γ)\right)}$ and pion beta decay (Pib) $π^+\rightarrowπ^0eν$. The pion to muon decay ($π\rightarrowμ\rightarrow e$) has four orders of magnitude higher probability than the pion to electron decay ($π\rightarrow eν$). To achieve the necessary branching-ratio precision it is crucial to suppress the $π\rightarrowμ\rightarrow e$ energy spectrum that overlaps with the low energy tail of $π\rightarrow eν$. A high…
Two beamline Cherenkov detectors (Ckov-a,-b) support particle identification in the MICE beamline. Electrons and high-momentum muons and pions can be identified with good efficiency. We report on the Ckov-a,-b performance in detecting pions and muons with MICE Step I data and derive an upper limit on the pion contamination in the standard MICE muon beam.
We report on the first cross section measurement of charged-current single charged pion production by neutrinos and antineutrinos on argon. This analysis was performed using the ArgoNeuT detector exposed to the NuMI beam at Fermilab. The measurements are presented as functions of muon momentum, muon angle, pion angle, and angle between muon and pion. The flux-averaged cross sections are measured to be $2.7\pm0.5(stat)\pm0.5(syst) \times 10^{-37} \textrm{cm}^{2}/\textrm{Ar}$ for neutrinos at a mean energy of 9.6 GeV and $8.4\pm0.9(stat)^{+1.0}_{-0.8}(syst) \times 10^{-38} \textrm{cm}^{2}/\textr…
Neutrino Induced Charged Current Coherent Pion Production for Constraining the Muon Neutrino Flux at DUNE
研究中微子诱导电荷电流相干π介子产生作为约束DUNE中微子通量的工具，通过重构出射粒子确定中微子能量和风味，利用Adler关系结合π-氩弹性散射截面进行分析，提出利用该过程拟合中微子通量并评估统计精度。
MICE is an experiment with a section of an ionization cooling channel and a muon beam. The muons will be produced by the decay of pions from a target dipping into the ISIS proton beam at Rutherford Appleton Laboratory (RAL). The channel includes liquid-hydrogen absorbers providing transverse and longitudinal momentum loss and high-gradient radiofrequency (RF) cavities for longitudinal reacceleration, all packed into a solenoidal magnetic channel. MICE will reduce the beam transverse emittance by about 10% for muon momenta between 140 and 240 MeV/c. Time-of-flight (TOF) counters, a threshold Ch…
Neutrino physics is going through a very exciting phase. In last one and half years, crucial informations have been provided by both short and long baseline neutrino oscillation experiments. At short-baseline, recent neutrino oscillation studies seem to point towards the existence of active-sterile mixing. On the other hand at long-basline, recent T2K and MINOS data are in favor of non-zero theta13 opening up the possibility of observing CP-violation in the lepton sector. A stopped pion source provides neutrino beams with energy of a few tens of MeV from pion and muon decay-at-rest. A rich phy…
The stability of triple GEM detector setups in an environment of high energetic showers is studied. To this end the spark probability in a shower environment is compared to the spark probability in a pion beam.
Measurement of the differential cross section for neutral pion production in charged-current muon neutrino interactions on argon with the MicroBooNE detector
本文利用MicroBooNE探测器数据测量氩核上带电电流μ中微子反应中中性π介子产生的单微分截面，并与发生器模型比较，发现角度和动量分布总体符合良好，但在μ子前向角和中等动量区间存在模型偏差。
The international Muon Ionization Cooling Experiment (MICE) will perform a systematic investigation of ionization cooling with muon beams of momentum between 140 and 240\,MeV/c at the Rutherford Appleton Laboratory ISIS facility. The measurement of ionization cooling in MICE relies on the selection of a pure sample of muons that traverse the experiment. To make this selection, the MICE Muon Beam is designed to deliver a beam of muons with less than $\sim$1\% contamination. To make the final muon selection, MICE employs a particle-identification (PID) system upstream and downstream of the cooli…
Muon identification with Deep Neural Network in the Belle II K-Long and Muon detector
本研究针对Belle II实验的μ子鉴别需求，提出基于深度神经网络的新方法，利用KLM击中模式变量提升穿透信息利用效率，模拟实验显示在90%μ子效率下π子误判率从4.1%降至1.6%。
We present a lattice calculation of the leading Hadronic Vacuum Polarization (HVP) contribution of the light u- and d-quarks to the anomalous magnetic moment of the muon, $a_μ^{\rm HVP}(ud)$, adopting the gauge configurations generated by the European Twisted Mass Collaboration with $N_f = 2+1+1$ dynamical quarks at three values of the lattice spacing with pion masses in the range 210 - 450 MeV. Thanks to several lattices at fixed values of the light-quark mass and scale but with different sizes we perform a careful investigation of finite-volume effects (FVEs). In order to remove FVEs we deve…
Measurement of $σ(e^+e^-\toπ^+π^-γ(γ))$ and the dipion contribution to the muon anomaly with the KLOE detector
我们已经测量了位于DA $Φ$ NE（弗拉斯卡蒂核工厂）的截面$σ(e^+e^-\toπ^+π^-γ(γ))$，使用的是以小角度发射的初始状态辐射光子的事件，包括最终状态辐射。我们提出了一个新的数据集对应的积分亮度为240磅$^{-1}$的分析。我们已经实现了减少系统的不确定性与以前公布的KLOE结果。从截面中我们得到了质量范围为$0.592 < M_{ππ} < 0.975$ GeV的π介子形状因子和两个π介子态对μ子磁异常的贡献。对于后者，我们发现$Δa^{ππ}_μ= (387.2\pm0.5_{\rm stat}\pm2.4_{\rm exp}\pm2.3_{\rm th})\times 10^{-10}$
Muon/Pion Identification at BESIII based on Variational Quantum Classifier
针对BESIII实验中的μ/π鉴别问题，开发了基于9个量子比特的变分量子分类器，发现其性能与传统多层感知器神经网络相似，展示了量子机器学习在对撞机物理数据分析中的应用可行性。
Measurement of single charged pion production in the charged-current interactions of neutrinos in a 1.3 GeV wide band beam
利用K2 K长基线中微子实验中收集的数据，研究了带电μ介子中微子与碳相互作用中的单电荷π介子产生。入射μ介子中微子的平均能量为1.3 GeV。本分析中使用的数据主要来自全有源闪烁体探测器SciBar。在共振区（$W<2$ GeV/ $c^2$）中产生单个$π^{+}$的截面相对于充电电流准弹性截面被发现为0.734 $^{+0.140}_{-0.153}$。还测量了与能量相关的截面比。结果与以前的实验和我们的模型的预测是一致的。
Measuring Charged-Current Muon Neutrino Interactions in MiniBooNE
MiniBooNE试图证实或反驳LSND μ子-反中微子到电子-反中微子振荡信号具有高统计意义和不同的系统学。MiniBooNE积累了世界上最大的GeV中微子数据集。MiniBooNE采用宇宙μ子校准系统来研究探测器中μ子能量和方向的重建。本文介绍了μ介子中微子荷电准弹性截面和单π介子产生截面的测量进展。
Neutrino beam with about 300 MeV in energy, high-flux and medium baseline is considered a rational choice for measuring CP violation before the more powerful Neutrino Factory will be built. Following this concept, a unique neutrino beam facility based on muon-decayed neutrinos is proposed. The facility adopts a continuous-wave proton linac of 1.5 GeV and 10 mA as the proton driver, which can deliver an extremely high beam power of 15 MW. Instead of pion-decayed neutrinos, unprecedentedly intense muon-decayed neutrinos are used for better background discrimination. The schematic design for the …
Improved calorimetric particle identification in NA62 using machine learning techniques
针对 NA62 鉴别 μ 子与 π 子的需求，本文提出辅以滤波器的 CNN 量能器鉴别算法，在相同 π 子效率下将 μ 子误鉴别率降低 6 倍。
A study of muon-electron elastic scattering in a test beam
本研究在CERN利用COMPASS谱仪下游的μ子束流，通过石墨靶、Si追踪器和BGO量能器组成的装置，研究了μ子-电子弹性散射事件，并与MonteCarlo模拟结果进行了比较，为MUonE项目的精确测量提供了实验基础。
The NOvA experiment is a long-baseline neutrino oscillation experiment designed to measure the rates of electron neutrino appearance and muon neutrino disappearance. The NOvA near detector is located at Fermilab, 800 m from the primary target and provides an excellent platform to measure and study neutrino-nucleus interactions. We present the status of the measurement of the double differential cross section with respect to muon kinematics for interactions involving charged pions in the final state, $ν_μ + N \rightarrow μ+ π^{+/-} + X$. We have derived a convolutional neural network-based appr…
This study conducted an analysis of muons, protons, and charged pions emitted from $ν_μ$ charged-current interactions on iron using a nuclear emulsion detector. The emulsion detector with a 65$\,$kg iron target was exposed to a neutrino beam corresponding to 4.0$\times$10$^{19}$ protons on target with a mean neutrino energy of 1.49$\,$GeV. The measurements were performed at a momentum threshold of 200 (50)$\,$MeV/$c$ for protons (pions), which are the lowest momentum thresholds attempted up to now. The measured quantities are the multiplicities, emission angles, and momenta of the muons, proto…
A new muon beamline, muon science innovative channel (MuSIC), was set up at the Research Centre for Nuclear Physics (RCNP), Osaka University, in Osaka, Japan, using the 392 MeV proton beam impinging on a target. The production of an intense muon beam relies on the efficient capture of pions, which subsequently decay to muons, using a novel superconducting solenoid magnet system. After the pion-capture solenoid the first $36^\circ$ of the curved muon transport line was commissioned and the muon flux was measured. In order to detect muons, a target of either copper or magnesium was placed to sto…
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