Generation of arbitrarily polarized muon pairs via polarized $e^-e^+$ collision

Electroweak effects in polarized muon-electron scattering

A theoretical description of elastic polarized muon-electron scattering is presented. Complete one-loop electroweak radiative corrections are calculated with taking into account the exact dependence on the muon mass. The effects due to some higher order corrections and the electroweak scheme dependence are analyzed. The case of longitudinally polarized fermions in the initial state is investigated. Analytical results are derived with the help of the SANC system. Numerical results are presented for unpolarized and polarized cross sections. Calculations are realized in the Monte Carlo integrator…

V+A相互作用下极化μ子的静止衰变

Polarized Muon Decay at Rest with V+A Interaction

本文分析了极化μ子静止衰变（PMDaR）和弹性中微子-电子散射（ENES），其中除了考虑标准V-A相互作用外，还考虑了非标准V+A相互作用。考虑狄拉克质量μ中微子和电子反中微子。此外，μ子中微子是横向极化的。这意味着出射的μ子中微子束是左、右手征μ子中微子的混合体，并且相对于产生面具有固定的横向自旋极化方向。我们发现μ子中微子的角能分布包含了标准V-A耦合和奇异V+A耦合之间的干涉项，它们与μ子中微子自旋极化的横向分量成正比。它们在无质量中微子的极限下并不消失，并且包含了检验CP破坏的相对相位。因此，它允许计算中微子通量和预期的事件数在ENES（检测过程）的标准模型预测和中微子左右混合的情况下。

极化μ子的$μ\to eγ$搜索

$μ\to eγ$ Search with Polarized Muons

提出了一种利用极化μ子研究轻子味破坏$μ^{+}\rightarrow e^{+}γ$衰变的方法。通过测量$e^{+}$ s相对于μ子自旋方向的角分布，特别是反平行$e^{+}$ s，可以显著抑制来自$μ^{+}\rightarrow e^{+}ν\overlineνγ$的严重物理背景以及伴随高能光子的正常μ子衰变的偶然背景。除了灵敏度的增强之外，一旦观察到信号，角分布将区分标准模型的不同扩展。

极化μ子对$μ\to eγ$的背景抑制

Background Suppression for $μ\to eγ$ with Polarized Muons

利用极化μ子研究轻子味破坏的$μ^{+}\rightarrow e^{+}γ$衰变，抑制了正常μ子衰变中的$e^{+}$和辐射μ子衰变中的高能光子$μ^{+} \rightarrow e^{+} ν\overlineν γ$之间的偶然巧合所产生的严重背景.研究发现，与正常μ子衰变中的$e^{+}$类似，在$μ^{+} \rightarrow e^{+} ν\overlineν γ$衰变中，高能光子优先沿μ子自旋方向发射.选择性地测量$e^{+}$ s或反平行于μ子自旋方向运动的光子，将抑制分别具有右手和左手$e^{+}$ s的$μ^{+} \rightarrow e^{+} γ$的偶然背景。

极化μ子对撞机上的顶级夸克物理

Top Quark Physics at a Polarized Muon Collider

在极化μ子对撞机上研究了阈区以上顶夸克对的产生。非对角自旋基是这个讨论的自然基础，因为顶夸克对在100%极化的情况下以基本上唯一的自旋配置产生。适度的极化，比如说30%，可以导致90%的顶夸克对事件处于一种自旋构型。这将导致对反常顶夸克耦合的敏感测试。

极化弹性MU-E散射的QED修正

QED Corrections for Polarized Elastic MU-E Scattering

我们提出了一个新的研究极化弹性μ子电子散射。计算了任意极化μ子和电子的玻恩截面，确定了纵向极化μ子和电子的完全光子辐射修正。所有的计算都是通过两种方法：半解析，它允许实施的实验削减用于分析的MU-E散射数据从束偏振仪的SMC实验在欧洲核子研究中心和完全分析，这是用于交叉检查的FORTRAN代码MUELA实现公式的两种方法。我们证明，某些实验削减导致μ子束偏振实验中的辐射修正可以忽略不计。

从极化μ介子衰变预测正电子的能量分布和极化

Predictions for energy distribution and polarization of the positron from the polarized muon decay

考虑极化μ子的纯轻子衰变，在Michel局域相互作用之外存在一种新的张量相互作用。这种相互作用导致了末态带电轻子的新的能量分布和极化。这种类型的相互作用的存在是强烈需要的最新实验结果的描述弱辐射π介子衰变在全运动学区域。假设夸克-轻子普适性，预测偏离标准模型只使用一个新的参数。它们与目前的实验数据不矛盾，并且可以在PSI和TRIUMF正在进行的实验中进一步验证，至少达到3个标准差的水平。

极化μ子的$μ\to e γ$和$μ\to 3e$过程与超对称大统一理论

$μ\to e γ$ and $μ\to 3e$ Processes with Polarized Muon and Supersymmetric Grand Unified Theories

在超对称大统一理论（SUSY GUT）中研究了极化μ子的轻子味破坏过程$μ\to e γ$和$μ\to 3e$.详细的数值计算结果表明，利用μ子极化和两个分支分数之比定义的P-奇不对称性和T-奇不对称性使SU（5）和SO（10）超对称大统一理论有很好的对比。这些观测量有助于提取两个理论的差异。特别是$μ\to e γ$的P-奇不对称性在SO（10）中变化100%-100%，而在SU（5）中为100%; $μ\to 3e$的T-奇不对称性在SU（5）中在EDM约束下可达15%，而在SO（10）中很小。

Relativistic elastic scattering of a muon neutrino by an electron in an elliptically polarized laser field

Within the framework of electroweak theory, we investigate the elastic scattering process $ e^{-} + ν_μ \rightarrow e^{-} + ν_μ$ in the presence of an intense elliptically polarized laser field. We derive an analytical expression for the spin-unpolarized differential cross section using the first Born approximation and the Dirac-Volkov states to describe the incident and scattered electrons. Our results generalize those found for the linearly polarized field by Bai \textit{et al.} [Phys. Rev. A \textbf{85}, 013402 (2012)] and for the circularly polarized field by El Asri \textit{et al.} [Phys.…

Muon pair production via $e^{+}e^{-}$ annihilation in the presence of a circularly polarized laser field

In this paper, we have investigated the elementary particle reaction ${e}^{+} {e}^{-} \rightarrowμ^{+} μ^{-}$ that results from the electron-positron interaction, at the leading order, with an intense laser wave of circular polarization. We have derived, by annalytical means, the laser-assisted differential cross section expression by using the scattering matrix approach. We have analyzed the energy and the number of exchanged photons dependence of muon pair production in electron-positron annihilation at different centre of mass energies including the $Z$-boson peak. For this reason, a wide r…

极化μ子衰变谱的高阶NLO辐射修正

Higher-order NLO radiative corrections to polarized muon decay spectrum

研究采用QED结构函数方法计算极化μ子衰变谱的高阶QED修正，给出新的α³ln²阶解析结果并修正既有结果。

Elastic scattering of a muon neutrino by an electron in the presence of a circularly polarized laser field

In view of the great contribution of neutrino-electron scattering to the deep understanding of electroweak interactions, we focus in this paper on the study of elastic scattering of a muon neutrino by an electron $(e^{-}ν_μ\rightarrow e^{-}ν_μ)$ in the presence of a circularly polarized electromagnetic field. We perform our theoretical calculation within the framework of Fermi theory using the exact wave functions of charged particles in an electromagnetic field. The expression of the differential cross section (DCS) for this process is obtained analytically in the absence and presence of the …

Momentum distribution of the electron pair from the charged lepton flavor violating process $μ^-e^-\to e^-e^-$ in muonic atoms with a polarized muon

The $μ^-e^-\to e^-e^-$ process in a muonic atom is one of the promising probes to study the charged lepton flavor violation (CLFV). We have investigated the angular distribution of electrons from the polarized muon of the atomic bound state. The parity violating asymmetric distribution of electrons is analyzed by using lepton wave functions under the Coulomb interaction of a finite nuclear charge distribution. It is found that the asymmetry parameters of electrons are very sensitive to the chiral structure of the CLFV interaction and the contact/photonic interaction. Therefore, together with t…

极化μ子的$μ\to e γ$和$μ\to 3e$过程与超对称大统一理论

$μ\to e γ$ and $μ\to 3e$ processes with polarized muons and supersymmetric grand unified theories

在超对称大统一理论中，用极化μ子详细分析了$μ^{+} \to e^{+} γ$和$μ^{+} \to e^{+}e^{+}e^{-}$过程.我们首先提出了基于广义轻子味破坏耦合的有效拉格朗日量的$μ^{+} \to e^{+}e^{+}e^{-}$衰变的Dalitz图分布，并定义了各种P-和T-奇不对称性。我们计算了超对称SU（5）和SO（10）模型中的分支比和不对称性，并考虑了复杂的软超对称破缺项。通过对电子、中子和原子电偶极矩的实验限制，我们发现$μ^{+} \to e^{+}e^{+}e^{-}$的T奇不对称性在SU（5）情形下可以达到15%.在SO（10）模型中，$μ^{+} \to e^{+} γ$关于μ子极化的P奇不对称性在-20%到-100%之间变化，而在SU（5）模型中则是$+100%$。我们还发现，$μ^{+} \to e^{+}e^{+}e^{-}$中的P-奇不对称性以及$μ^{+} \to e^{+}e^{+}e^{-}$和$μ^{+} \to e^{+} γ$分支分数的比值对区分不同的模型是有用的.

Search for lepton-flavor-violating ALPs at a future muon collider and utilization of polarization-induced effects

Axion-Like Particles (ALPs) are pseudo Nambu-Goldstone bosons associated with spontaneously broken global $U(1)$ symmetries. Such particles can have lepton-flavor-violating (LFV) couplings to the SM charged leptons. LFV ALPs provide the possibility to address some of the SM long-lasting problems. We investigate the sensitivity of a future muon collider suggested by the Muon Accelerator Program (MAP) to the production of LFV ALPs in the ALP mass range $m_a\leq1$ MeV. ALPs are assumed to be produced through the LFV decay $τ\ra\ell a$ ($\ell=e,μ$) of one of the tau leptons produced in the muon-an…

Transverse positron polarization in the polarized $μ^+$ decay related with the muonium-to-antimuonium transition

The constructions of the new high-intensity muon beamlines are progressing in facilities around the world, and new physics searches related to the muons are expected. The facilities can observe the transverse positron polarization of the polarized $μ^+$ decay to test the standard model. The transition of muonium into antimuonium (Mu-to-$\bar{\text{Mu}}$ transition), which is one of the interesting possibilities in the models beyond the standard model, can be also tested. The near-future observation of the transition gives us a great impact since it indicates that there is an approximate discre…

辐射μ介子俘获中的极化光子

Polarized photons in radiative muon capture

我们讨论了辐射μ子俘获产生的偏振光子的测量。左旋圆偏振光子的光谱或等效的辐射μ子捕获氢发射的光子的圆偏振是相当敏感的诱导赝标耦合常数$g_P$的强度。尽管测量这些量中的任何一个都非常困难，但可能足以解决目前因$g_P$的理论预测与最近实验结果之间的不一致而产生的难题。这种灵敏度是由于没有μ子线的左手辐射，以及根据重子手征微扰理论的手征功率计数规则确定的强子线辐射的主要部分都包含π极。

Longitudinally polarized ZZ scattering at the Muon Collider

Measuring longitudinally polarized vector boson scattering in, e.g., the ZZ channel is a promising way to investigate the unitarization scheme from the Higgs and possible new physics beyond the Standard Model. However, at the LHC, it demands the end of the HL-LHC lifetime luminosity, 3000/fb, and advanced data analysis technique to reach the discovery threshold due to its small production rates. Instead, there could be great potential for future colliders. In this paper, we perform a Monte Carlo study and examine the projected sensitivity of longitudinally polarized ZZ scattering at a TeV scal…

纵向极化强子-强子碰撞中重夸克关联的次领先级QCD修正

Next-to-Leading Order QCD Corrections to Heavy Quark Correlations in Longitudinally Polarized Hadron-Hadron Collisions

本文对BNL-RHIC纵向极化质子-质子碰撞中的重味分布和关联进行了全面的唯象研究。所有结果都是用一个灵活的部分子级蒙特卡罗程序在次领先的顺序精度，并包括重介子的分裂，其随后的半轻子衰变，和实验削减。次至首阶的QCD修正对于截面和双自旋不对称性都是显著的。本文评估了BNL-RHIC重味测量对核子胶子极化的敏感性。电子-μ子和μ子-μ子相关性被证明是最有希望的观测量。理论的不确定性估计不同的重整化和因式分解尺度，重夸克质量，和碎裂参数。

从极化μ子对产生中提取π介子分布振幅

Extraction of the pion distribution amplitude from polarized muon pair production

我们考虑介子在纵向极化质子上的散射产生μ介子对。我们计算了这个过程的截面和单自旋不对称性，考虑到π束缚态效应。我们工作在运动区域的光子有一个大的纵向动量分数，这使我们能够处理的束缚态问题微扰。我们的预测与π介子分布的振幅成正比。因此，偏振Drell-Yan截面的测量允许确定π介子分布振幅的形状。

任意偏振光子产生矢量介子的螺旋度更软偶极子坡密子模型

Helicity Softer Dipole Pomeron Model for Vector Meson Photoproduction by Arbitrarily Polarized Photons

基于Regge理论框架，提出更软偶极子坡密子模型，通过同步拟合三类数据同时描述ρ⁰光产生的截面和自旋密度矩阵元素，并预测圆极化SDMEs。

极化轻子-轻子散射中的左右不对称性

Left-right asymmetries in polarized lepton-lepton scattering

本文在树水平的电弱标准模型的背景下，考虑了Møller电子-电子和μ-μ子散射中的几种宇称破坏的左右不对称性.我们表明，在对撞机的不对称性，只有一个偏振光束是足够大的，以补偿较小的截面在高能量。我们还表明，这些不对称性是非常敏感的双电荷矢量双轻子共振，但它们是不敏感的标量。

静止极化μ介子衰变中μ介子中微子的右手手征

Right-handed chirality of muon neutrinos in polarized muon decay at rest

本文分析了极化μ子的静态衰变（PMDaR），其中除了考虑标准V-A相互作用外，还考虑了非标准V+A相互作用。研究表明，Dirac μ子中微子的角能分布对左手征μ子中微子的标准V-A耦合和右手征μ子中微子的奇异V+A耦合之间的干涉项敏感，它们与μ子中微子自旋极化的横向分量成正比.这些干涉在无质量极限下不消失，并包含了检验CP破坏（CPV）的相对相位。它允许计算一个假设的配置的检测器的情况下，SM预测的中微子通量，和中微子通量的上限为左，右μ子中微子混合物。我们还证明了中微子质量和混合的影响是微小的修正，可以忽略不计。最重要的结论是，即使在无质量极限下，当奇异相互作用V+A与电子观测值相反时，在自旋1/2量子态中，存在与左手和右手螺旋度分量的混合有关的物理效应，其中所有可能的干扰都消失了。

μ子衰变谱的高阶QED修正

Higher order QED corrections to muon decay spectrum

考虑了极化μ子衰变谱的QED辐射修正。使用前导和次前导对数近似。讨论了软辐射的指数化问题。目前的理论不确定性的频谱描述的估计。

非线性康普顿散射产生的任意偏振$\gamma$光子源

Arbitrarily polarized $γ$-photon source from nonlinear Compton scattering

本研究针对高能电子束与激光脉冲碰撞的非线性康普顿散射，提出在窄角接收条件下需平衡激光强度以最大化光子通量，并发现接收光子偏振与激光偏振紧密相关，为精细控制光子偏振提供了新途径。

Boson pair production in arbitrarily polarized electric fields

The momentum spectrum and number density of created bosons for two types of arbitrarily polarized electric fields are calculated and compared with those of created fermions, employing the equal-time Feshbach-Villars-Heisenberg-Wigner formalism which is confirmed that for an uniform and time-varying electric field it is completely equivalent to the quantum Vlasov equation in scalar QED. For an elliptically polarized field, it is found that the number density of created bosons is a square root of the number density of spin-up electrons times that of spin-down ones for a circularly polarized mult…

轻子味破坏μ子衰变中的CP破坏追踪

Tracing CP-violation in Lepton Flavor Violating Muon Decays

虽然在标准模型中，轻子味破坏（LFV）衰变$μ^+\to e^+ γ$是被禁止的，但它可以在标准模型之外的各种理论中发生。如果该衰变的分支比饱和了其当前边界[{ \it，即，} Br $(μ^+ \to e^+γ)\sim 10^{-11}$ ]，即将进行的实验可以高精度地测量分支比，从而产生关于LFV来源的信息。在这封信中，我们表明，对于极化$μ^+$，通过研究横向极化的正电子和线极化的光子的角分布，我们可以得到的CP破坏源的信息超出SM。我们还研究了衰变$μ^+\to e^+_1 e^- e^+_2$中最后粒子的角分布，其中$e^+_1$被定义为能量更高的正电子。我们表明，横向极化$e_1^+$可以提供有关基础理论的CP违反相位的某种组合的信息，这些信息将通过对$e^+_1$的自旋求平均而丢失。

GPD Physics With Polarized Muon Beams at COMPASS-II

A major part of the future COMPASS program is dedicated to the investigation of the nucleon structure through Deeply Virtual Compton Scattering (DVCS) and Deeply Virtual Meson Production (DVMP). COMPASS will measure DVCS and DVMP reactions with a high intensity muon beam of 160 GeV and a 2.5 m-long liquid hydrogen target surrounded by a new TOF system. The availability of muon beams with high energy and opposite charge and polarization will allow to access the Compton form factor related to the dominant GPD $H$ and to study the $x_{B}$-dependence of the $t$-slope of the pure DVCS cross section…

线极化laser场中正电子偶素产生μ子对

Muon pair creation from positronium in a linearly polarized laser field

研究了电子偶素通过与线偏振的超强激光场相互作用衰变为μ子-反μ子对的过程。在近红外频率范围内，所需的最小激光强度为10^22 W/cm ^2。在激光修饰的量子电动力学框架内，计算了场-自由电子-正电子湮灭成μ子的总反应速率，并将其与湮灭截面联系起来。μ子是用超相对论能量产生的，并沿激光传播方向以窄角度发射。的μ子的动力学性质的解释在一个经典的简单的人的模型的生产过程。我们表明，最有前途的设置的过程中的实验研究采用两个对向传播的激光束撞击在一个正电子素目标，相干电子-正电子碰撞的优势变得明显。

极化氘靶上高能μ子产生带电强子的方位不对称性

Azimuthal asymmetries in production of charged hadrons by high energy muons on polarized deuterium targets

使用2002- 2004年COMPASS数据，对160 GeV μ子在纵向极化氘靶上半包容性产生带电强子的方位角不对称性进行了研究。所观察到的不对称性集成的运动学变量不依赖于所产生的强子的方位角，并与比率$g_1^d(x)/f_1^d(x)$是一致的。考虑到不同的部分子分布函数和部分子碎裂函数对夸克横自旋的不同贡献，非对称性被参数化，它们可以用$\sin(ϕ), \sin(2ϕ), \sin(3ϕ)$和$\cos(ϕ)$调制（或者/或者/和）.研究了这些振幅的$x$ -、$z$ -和$p_h^T$ -依赖性。

Measurement of the Michel Parameter xi" in Polarized Muon Decay and Implications on Exotic Couplings of the Leptonic Weak Interaction

The Michel parameter xi" has been determined from a measurement of the longitudinal polarization of positrons emitted in the decay of polarized and depolarized muons. The result, xi" = 0.981 +- 0.045stat +- 0.003syst, is consistent with the Standard Model prediction of unity, and provides an order of magnitude improvement in the relative precision of this parameter. This value sets new constraints on exotic couplings beyond the dominant V-A description of the leptonic weak interaction.

Using an intense laser beam in interaction with muon/electron beam to probe the Noncommutative QED

It is known that the linearly polarized photons can partly transform to circularly polarized ones via forward Compton scattering in a background such as the external magnetic field or noncommutative space time. Based on this fact we explore the effects of the NC-background on the scattering of a linearly polarized laser beam from an intense beam of charged leptons. We show that for a muon/electron beam flux $\bar\varepsilon_{μ,e}\sim 10^{12}/10^{10}\,{\rm TeV}\,{\rm cm}^{-2}\,{\rm sec}^{-1}$ and a linearly polarized laser beam with energy $k^0\sim $1 eV and average power $\bar{P}_{\rm laser}\s…

Generation of arbitrarily polarized GeV lepton beams via nonlinear Breit-Wheeler process

Generation of arbitrarily spin-polarized lepton (here refer in particular to electron and positron) beams has been investigated in the single-shot interaction of high-energy polarized $γ$ photons with an ultraintense asymmetric laser pulse via nonlinear Breit-Wheeler (BW) pair production. We develop a fully spin-resolved semi-classical Monte Carlo method to describe the pair creation and polarization in the local constant field approximation. In nonlinear BW process the polarization of created pairs is simultaneously determined by the polarization of parent $γ$ photons, the polarization and as…

极化轻子对撞机上的间接轻子夸克跃迁

Indirect Leptoquark Searches at Polarized Lepton Colliders

我们研究的效用，采用极化轻子（电子和μ子）束进行间接搜索标量leptoquark。我们发现极化可以扩大$e^+e^-$和$μ^+μ^-$机器排除轻夸克质量的范围。极化也可以提供一个诊断工具，以确定leptoquark耦合。

任意极化中子在磁场中的逆β衰变

Inverse beta-decay of arbitrarily polarized neutrons in a magnetic field

我们计算了在远小于$m_p^2/e$的背景磁场中逆β衰变过程$ν_e+n\to p+e$的截面。利用狄拉克方程在恒定磁场中的精确解，我们求出了初始中子任意极化的截面。即使假设初始中子是静止的，没有净极化，它的截面也取决于入射中微子的方向。可能的影响的结果进行了讨论。

线性极化光子对撞中真仲μ子素（true para-muonium）的产生

Production of true para-muonium in linearly polarized photon fusions

研究在重离子碰撞中通过线性极化光子对撞产生真仲μ子素，计算其产生率和横向动量谱，发现极化光子分布与横向动量分布显著相关，并确定最佳运动学区域，为实验探测提供理论指导。

On spin asymmetry in muon and tau decays

The angular asymmetry in decays of polarized muons and tau leptons is discussed. Both the standard $V-A$ Fermi model and the general parameterization via Michel parameters are considered. Numerical importance of contributions suppressed by charged lepton mass ratio is underlined. Contribution of the second order QED correction is estimated in the leading logarithm approximation.

极化μ子-质子深度非弹性散射中质子的自旋结构

Spin Structure of the Proton from Polarized Inclusive Deep-Inelastic Muon-Proton Scattering

我们已经测量了自旋相关的结构函数$g_1^p$在包括深非弹性散射极化μ子极化质子，在运动学范围$0.003 < x < 0.7$和$1 GeV^2 < Q^2 < 60 GeV^2$。一个次领先阶QCD分析被用来发展的测量$g_1^p(x,Q^2)$到一个固定的$Q^2_0$。$g_1^p$在$Q^2_0 = 10 GeV^2$的第一个时刻是$Γ^p = 0.136\pm 0.013(stat.) \pm 0.009(syst.)\pm 0.005(evol.)$。这个结果比Ellis-Jaffe求和规则的预测值低两个标准差以上。发现单重态轴向电荷$a_0$为$0.28 \pm 0.16$。在阿德勒-巴特尔分解方案中，需要$Δg \simeq 2$来使$ΔΣ$与夸克-部分子模型一致。对所有可用质子和氘核数据的综合分析证实了比约肯求和规则。

具有时间延迟的两个任意偏振电场下石墨烯中的电子-空穴对产生

Electron-hole pair production in graphene for two arbitrarily polarized electric fields with a time delay

该研究通过无质量量子动力学方程分析含时间延迟的任意偏振电场下石墨烯电子-空穴对的动量分布特征，对比真空电子-正电子对产生的差异，为固态系统模拟真空正负电子对产生提供理论参考。

$Z_n$ symmetry in the vortex muon decay

Polarization of a vortex state fermion has rich structure due to the nontrivial momentum distribution of wave function. This larger freedom provides an unique opportunity to prepare fermions in exotic polarized states, which do not exist for plane-wave state fermions. Based on the so called spin-orbit state which was studied both theoretically and experimentally, we put forward a peculiar vortex muon whose polarization exhibits $Z_n$ symmetry and study its decay. We investigate the azimuthal distribution of the emitted electrons and find that it exhibits the same symmetry ($Z_n$) as the initia…

pp碰撞中μ子对产生的横向双自旋不对称性

Transverse Double-Spin Asymmetries for Muon Pair Production in pp-Collisions

本文计算了强耦合下次主导阶Drell-Yan过程的横向双自旋不对称性对快度的依赖关系。在低强子质量标度下，通过饱和Soffer不等式得到输入横观度分布。给出了极化BNL-RHIC质子-质子对撞机和HERA-N固定靶实验的结果，详细研究了探测器有限μ子接受度对测量非对称性的影响。

相对论μ子与强流Laser束碰撞产生少光子电子-正电子对

Few-Photon Electron-Positron Pair Creation by Relativistic Muon Impact on Intense Laser Beams

研究了激光与库仑场联合作用下的正负电子对产生。为此，Feynman图的多光子对创建的μ子影响的圆偏振的高频激光束内的激光修饰的量子电动力学采用相对论Volkov状态的框架内进行评估。在低激光强度的限制下，该结果与已知的质子作为外库仑场产生多光子对的表达式一致。分析了总对创建速率的缩放。数值计算了后坐力分布，并讨论了后坐力分布与弹丸质量的关系。给出了产生粒子的能谱和散射μ子的角谱。

极化电子和正电子与Z ~ 100核高能散射反应中类氢轻子束缚态（e^- mu^+）和（e^+ mu^-）的登记及CPT不变性分析

Registration of hydrogen-like leptonic bound states (e^- mu^+) and (e^+ mu^-) in reactions of high-energy scattering of polarized electrons and positrons by nuclei with Z ~ 100 and analysis of CPT invariance

计算了高能电子（正电子）与核e^-（e^+）+ Z -> Z + M^0（反M^0）+ mu^-（mu^+）散射产生μ偶素（反μ偶素）反应的截面，该截面依赖于初始电子（正电子）的能量和极化以及最终μ ^-（mu^+）-介子的极化.由于相干现象，截面与Z ^2成正比。对于Z ~ 100，由于因子Z ^2，截面足够大，可以在DESY中的HERA对撞机上测量。结果进行了讨论，在与CPT不变性的测试。

利用TWIST数据研究极化μ子衰变中的轻子味类轴子粒子（ALPs）

Leptophilic ALPs with TWIST data for polarized muon decays

本研究利用TWIST实验数据，通过d=7维有效算符研究μ子衰变中轻子味类轴子粒子的产生与不可见衰变，给出其耦合参数约束，并探讨实验修改及粒子稳定性对未来探测的意义。

Measurement of the radiative decay of polarized muons in the MEG experiment

We studied the radiative muon decay $μ^+ \to e^+ν\barνγ$ by using for the first time an almost fully polarized muon source. We identified a large sample (~13000) of these decays in a total sample of 1.8x10^14 positive muon decays collected in the MEG experiment in the years 2009--2010 and measured the branching ratio B($μ^+ \to e^+ν\barνγ$) = (6.03+-0.14(stat.)+-0.53(sys.))x10^-8 for E_e > 45 MeV and E_γ > 40 MeV, consistent with the Standard Model prediction. The precise measurement of this decay mode provides a basic tool for the timing calibration, a normalization channel, and a strong qual…

弹性缪子-质子散射中 $π^0$ 交换的贡献

Contribution of $π^0$ Exchange in Elastic Muon-Proton Scattering

本文计算弹性缪子-质子散射中 $t$ 道 $π^0$ 交换对螺旋度翻转干涉及双自旋不对称量的贡献，发现 MUSE 运动学区域约为 0.15%。

轻介子和μ子辐射衰变与光子偏振不对称性

Light Mesons and Muon Radiative Decays and Photon Polarization Asymmetry

系统地计算和讨论了介子和μ子的极化辐射衰变。明确计算了末态轻子和光子的动量和螺旋度的双微分分布。在动量的软、硬区域，考察和分析了轻子和光子极化的动力学过程。右手轻子与伴随光子的特殊配置进行了研究，并解释为轴异常的表现。光子偏振不对称性进行了评估。偏振振幅对红外线和共线奇异性的显着性与区分右手和左手最终轻子的机制。我们提出了一个可能的测试，利用光子偏振来澄清最近观察到的辐射介子衰变的差异。

在缪子对撞机上通过成对产生探测中性矢量轻子的前景

Prospects for probing neutral vector-like leptons via pair production at a muon collider

研究6 TeV缪子对撞机通过成对产生探测中性双重态矢量轻子（N）的灵敏度，分析W玻色子强子衰变和轻子衰变产生的两个信号，发现统计显著性在广泛质量范围内超过5σ。

Precision radiative corrections to the muon polarization in the semileptonic decay of a charged kaon

An expression for the Dalitz plot of the semileptonic decay of a charged kaon, including radiative corrections to order O[απ)(q/M_1)], where q is the four-momentum transfer and M_1 is the mass of the decaying kaon, is obtained. Contributions of both the three- and four-body regions are accounted for. Besides, the emitted muon is considered to be polarized so the analysis is also focused on evaluating the radiative corrections to the longitudinal, transverse, and normal polarization components of the muon. The final formulas, with the triple integration of the bremsstrahlung photon variables re…

Polarized Lepton-Nucleon Elastic Scattering and a Search for a Light Scalar Boson

Lepton-nucleon elastic scattering, using the one-photon and one-scalar-boson exchange mechanisms considering all possible polarizations, is used to study searches for a new scalar boson and suggest new measurements of the nucleon form factors. A new light scalar boson, which feebly couples to leptons and nucleons, may account for the proton radius and muon $g-2$ puzzles. We show that the scalar boson produces relatively large effects in certain kinematic region when using sufficient control of lepton and nucleon spin polarization. We generalize current techniques to measure the ratio $G_E/G_M$…

极化和非极化$μ$对介子诱导的Drell-Yan产生和π介子分布振幅

Polarized and unpolarized $μ$-pair meson-induced Drell--Yan production and the pion distribution amplitude

我们提出了一个详细的分析介子诱导的大量轻子（μ子）Drell-Yan生产过程$π^{-}N\toμ^{+}μ^{-}X$，考虑到一个非极化的核子靶和纵向极化质子。使用QCD框架，我们专注于角分布的$μ^+$，这是敏感的π介子分布振幅的形状，目标是测试相应的结果对现有的实验数据。预测，采用不同的π分布振幅，方位角的依赖关系的$μ^{+}$分布在极化的情况下，相关的计划罗盘实验。在这两种情况下，QCD的演变给予特别关注。

Transverse spin azimuthal asymmetries in SIDIS at COMPASS: Multidimensional analysis

COMPASS is a high-energy physics experiment operating at the SPS at CERN. Wide physics program of the experiment comprises study of hadron structure and spectroscopy with high energy muon and hadrons beams. As for the muon-program, one of the important objectives of the COMPASS experiment is the exploration of the transverse spin structure of the nucleon via spin (in)dependent azimuthal asymmetries in single-hadron production in deep inelastic scattering of polarized leptons off transversely polarized target. For this purpose a series of measurements were made in COMPASS, using 160 GeV/c longi…

中性K介子半轻衰变中μ子极化的辐射修正

Radiative Corrections to the Muon Polarization in the Semileptonic Decay of a Neutral Kaon

本文给出含$\ncalO[(α/ π)(q/M_1)]$阶辐射修正的中性K介子半轻衰变$K_{μ3}^0$达利兹图模型无关表达式，数值计算μ子三个极化分量的辐射修正，发现修正值远小于未修正值，可用于模型无关实验分析。

Quasiclassical approach to synergic synchrotron-Cherenkov radiation in polarized vacuum

The photon emission by an ultrarelativistic charged particle in extremely strong magnetic field is analyzed, with vacuum polarization and photon recoil taken into account. The vacuum polarization is treated phenomenologically via refractive index. The photon emission occurs in the synergic (cooperative) synchrotron-Cherenkov process [J. Schwinger, W. Tsai and T. Erber, Annals of Physics, 96 303 (1976)] which is similar to the synchrotron emission rather than to the Cherenkov one. For electrons, the effect of the vacuum polarization on the emission spectrum is not evident even beyond the probab…