Wen Yin, Masahiro Yamaguchi
The long-standing discrepancy of muon $g-2$ is a hint of new physics beyond the standard model of particle physics. In this letter we show that heavy new physics contribution can be fully tested at a muon collider with center-of-mass energy up to $O(10)\,$TeV. Even if there is no new particle in this energy range, one can measure the $g-2$ directly via the channel to a Higgs boson and a monochromatic photon.
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In recent years, with the enlightenment of some issues encountered at muon colliders, muon colliders have become more feasible for the high-energy physics community. For this reason, we studied single production of excited muon at muon colliders via contact interaction. Besides, we assumed that the excited muon is produced via contact interactions and decays to the photon and the muon through the gauge interaction. Then, signal and background analyses were performed at the muon anti-muon collider options with 6 TeV, 14 TeV, and 100 TeV center-of-mass energies for the excited muon. Attainable m…
We investigate the resonant production of color octet muons in order to explore the discovery potential of the FCC-based μp colliders. It is shown that search potential of μp colliders essentially surpass potential of the LHC and would exceed that of FCC pp collider.
We describe recent work on the physics of the Higgs boson at future muon colliders. Starting from the low energy muon collider at the Higgs boson pole we extend our discussion to the multi-TeV muon collider and outline the physics case for such machines about the properties of the Higgs boson and physics beyond the Standard Model that can be possibly discovered.
The potential for the Higgs boson and Z-pole physics at the first muon collider is summarized, based on the discussions at the ``Workshop on the Physics at the First Muon Collider and at the Front End of a Muon Collider'' .
I discuss the exciting prospects for exploring a wide range of new physics at a low-energy muon collider.
A review of muon colliders is presented. Basic features of the accelerator and detector are outlined, and the very exciting physics prospects are reviewed.
Invisible Higgs from forward muons at a muon collider
本研究提出在μ子对撞机上利用Z玻色子融合伴随产生的前向μ子探测Higgs不可见衰变，指出高灵敏度可行但受μ子能量与角度分辨率制约。
Recently proposed Future Circular Collider based muon-proton colliders will allow investigating lepton-hadron interactions at the highest center-of-mass energy. In this study, we investigate the potential of these colliders for a four-fermion contact interactions search. Regarding the constructive and destructive interferences of contact interactions, we estimated discovery, observation, and exclusion limits on the compositeness scale for the left-left, right-right, left-right, and right-left helicity structures. This study's findings show that the FCC-based μp colliders have great potential f…
An electron-muon collider with an asymmetric collision profile targeting multi-ab$^{-1}$ integrated luminosity is proposed. This novel collider, operating at collisions energies of e.g. 20-200 GeV, 50-1000 GeV and 100-3000 GeV, would be able to probe charged lepton flavor violation and measure Higgs boson properties precisely. The collision of an electron and muon beam leads to less physics background compared with either an electron-electron or a muon-muon collider, since electron-muon interactions proceed mostly through higher order vector boson fusion and vector boson scattering processes. …
Boosting VBF Reconstruction at Muon Colliders
本文提出通过不对称束流能量提升缪子对撞机中矢量玻色子融合过程的重建能力，以增强对$W$-和$Z$-引发过程的区分。
We discuss the discovery potential of a promising signals, $3 \times μ^+ μ^-$ at a $μ^+ μ^-$ collider and $μ^+ μ^+ μ^+ μ^+ μ^- μ^- $ at a $μ^+ μ^+$ collider, that are obtained via production of $Z'$ and a new scalar boson $ϕ$ in a spontaneously broken local $U(1)_{L_μ- L_τ}$ model. We consider the $Z'$ associated production from the process $μ^+ μ^- \to ϕZ'$ in addition to a muonphilic $Z'$ fusion process $μ^+ μ^\pm \to ϕμ^+ μ^\pm$. The scalar boson is associated with $U(1)_{L_μ- L_τ}$ symmetry breaking and dominantly decays into $Z' Z'$ mode. We carry out numerical simulation analysis for sig…
Searching for neutrino self-interactions at future muon colliders
研究未来缪子对撞机固定靶实验对中微子自相互作用的探测灵敏度，发现主探测器和前向探测器可提升现有上限两个数量级，超越其他未来实验。
Essay: A path for the construction of a Muon Collider
本文指出缪子对撞机相比现有对撞机在能量探索和精确测量上的优势，总结其研发进展，明确缺失研发步骤并提出未来二十年实现计划，可探索希格斯玻色子及暗物质相关新粒子等当前技术无法触及的物理。
Probe of a Randall-Sundrum-like model from muon pair production at high energy muon collider
该研究在类 Randall-Sundrum 模型下，计算了未来高能缪子对撞机上缪子对产生过程的截面，并给出了五维引力尺度随能量和亮度的排除界限。
We describe a class of models of electroweak symmetry breaking that involves strong dynamics and top quark condensation. A new scheme based upon a seesaw mechanism appears particularly promising. Various implications for the first-stage muon collider are discussed.
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…
Several different scenarios for neutrino scattering experiments using a neutrino beam from the muon collider complex are discussed. The physics reach of a neutrino experiment at the front end of a muon collider is shown to extend far beyond that of current neutrino experiments, since the high intensity neutrino beams one would see at the muon collider allow for a large flexibility in choosing neutrino targets. Measurements of quark spin, A-dependence of the structure function $xF_3$ and neutral current chiral couplings to quarks are outlined.
Search for vector-like leptons at a Muon Collider
本研究在4321模型框架下，利用机器学习技术对缪子对撞机寻找矢量类轻子进行可行性分析，发现3 TeV缪子对撞机仅需10/fb数据即可覆盖高达1450 GeV的质量范围。
We show that a muon collider is ideally suited for the study of heavy H/A scalars, cousins of the Higgs boson found in two-Higgs doublet models and required in supersymmetric models. The key aspects of H/A are: (1) they are narrow, yet have a width-to-mass ratio far larger than the expected muon collider beam-energy resolution, and (2) the larger muon Yukawa allows efficient s-channel production. We study in detail a representative Natural Supersymmetry model which has a 1.5 Tev H/A with $m_H$- $m_A$ = 10 Gev. The large event rates at resonant peak allow the determination of the individual H a…
Search For a Leptoquark and Vector-like Lepton in a Muon Collider
本研究针对μ子(g-2)反常等物理问题，提出在3 TeV μ子对撞机上通过2μ+2b+mET道寻找TeV级轻子夸克的方案，验证了低积分亮度下的探测可行性。
We point out that heavy new physics contributions in leptonic dipole moments and high-energy cross-sections of lepton pairs into Higgs bosons and photons are connected model-independently. In particular, we demonstrate that a muon collider, running at center-of-mass energies of several TeV, can provide a unique test of new physics in the muon g-2 through the study of high-energy processes such as mu+ mu- -> h gamma. This high-energy test would be of the utmost importance to shed light on the long-standing muon g-2 anomaly as it is not affected by the hadronic and experimental uncertainties ent…
Probing Higgs-muon interactions at a multi-TeV muon collider
本文在 HEFT 与 SMEFT 框架下评估 3 和 10 TeV 缪子对撞机通过电弱玻色子及多重 Higgs 产生过程探测 Higgs-缪子耦合的能力，表明其灵敏度超越 LHC。
Muonic Force and Neutrino Non-Standard Interactions at Muon Colliders
本文提出利用3 TeV高能μ子对撞机的单光子过程探测μ子相关中微子NSI，分析接触相互作用及标量、矢量媒介最小模型，并给出不同亮度下95%置信水平的灵敏度。
Event Rates at a 10 TeV Muon Collider and Implications for Detector Design: Trigger, Data Acquisition, and Luminosity
本文档讨论了10 TeV μ子对撞机上各种过程的事件率，初步分析探测器将记录的内容及感兴趣过程的发生频率，并阐述其对探测器读出、潜在触发系统和亮度测量的影响。
Lepton Flavor Violating (LFV) processes are clear signals of physics beyond the Standard Model. We investigate the possibility of measuring this kind of processes at present and foreseeable future muon-electron colliders, taking into account present day bounds from existing experiments. As a model of new physics we consider a Z' boson with a $U'(1)$ gauge symmetry and generic couplings. Processes that violate lepton flavor by two units seem to be particularly promising.
The long-standing muon g-2 anomaly can be explained by heavy new physics particles through chirally enhanced contributions. It has been recently proposed that a muon collider running at center-of-mass energies of several TeV could test these new physics scenarios in a model-independent way, through the study of high-energy processes such as mu+ mu- --> h gamma. In this work, we validate these findings, based on effective field theories, by considering selected renormalizable simplified models and by computing this one-loop process in full generality. Furthermore, we explore the interplay of di…
Higgs boson properties could be studied with a high accuracy at a muon collider via the s-channel resonant production. We consider the situation where the center-of-mass energy of the muon collider is off the resonance above the Higgs mass. We discuss the discovery potential for a generic heavy Higgs boson ($H$) and compare different production mechanisms, including the "radiative return" ($γH$), $Z$-boson associated production ($ZH$) and heavy Higgs pair production ($HA$). These production mechanisms do not sensitively rely on a priori knowledge of the heavy Higgs boson mass. We include vario…
Optimal search reach for heavy neutral leptons at a muon collider
本文比较未来高能μ子与电子对撞机对重惰性中微子的探测能力，证明μ子对撞机在 $Z$ 极点以上至数TeV质量范围具有最远搜索覆盖，并指出二者在味空间的互补性。
A light leptophilic boson (scalar or pseudoscalar) has been postulated to explain the muon g-2 anomaly and could be a portal to dark matter. Realizing the leptophilic nature of a singlet boson in the framework of the two-Higgs-doublet-Model of type-X, we identify the parameter space viable for the explanation of the updated muon g-2 discrepancy. It is then shown that such a hypothetical particle will be unambiguously ruled out or discovered via the Yukawa process at a lepton collider designed as a Higgs factory.
Searches for multi-Z boson productions and anomalous gauge boson couplings at a muon collider
本文研究缪子对撞机上多Z玻色子产生过程，通过蒙特卡洛模拟评估其显著性并给出反常规范玻色子耦合的敏感性。
Detectors at a high-energy muon collider must be protected from the decay products of beam muons by installing shielding material around the beam pipe. In this article, the impact of these blind detector regions on new-physics signatures with invisible final-state particles is shown by studying the production of sleptons, the superpartners of leptons. Special attention is given to large backgrounds from two-photon collisions. It is demonstrated how the influence of these backgrounds can be controlled by implementing suitable cuts or running at two different center-of-mass energies, thus permit…
A high-energy muon collider with center-of-mass energy around and above 10 TeV is also a vector boson fusion (VBF) machine, due to the significant virtual electroweak (EW) gauge boson content of high-energy muon beams. This feature, together with the clean environment, makes it an ideal collider to search for TeV-scale axion-like particles (ALP) coupling to Standard Model EW gauge bosons, which current and other future colliders have limited sensitivities to. We present detailed analyses of heavy ALP searches in both the VBF and associated production channels at a muon collider with different …
In the light of the discovery of a 126 GeV Standard-Model-like Higgs boson at the LHC, we evaluate the achievable accuracies for direct measurements of the width, mass, and the s-channel resonant production cross section of the Higgs boson at a proposed muon collider. We find that with a beam energy resolution of R=0.01% (0.003%) and integrated luminosity of 0.5 fb^{-1} (1 fb^{-1}), a muon collider would enable us to determine the Standard-Model-like Higgs width to +/- 0.35 MeV (+/- 0.15 MeV) by combining two complementary channels of the WW^* and b\bar b final states. A non-Standard-Model Hig…
Neutrino Fluxes at a Muon Collider
本研究重新评估10 TeV缪子对撞机的中微子通量，发现其对撞区域通量远高于早期估计，还明确了额外不可忽略的中微子源，探讨了相关物理研究机遇。
Colorful Particle Production at High-Energy Muon Colliders
本文研究高能缪子对撞机中彩色重粒子的产生机制，计算多种彩色态的产生率与质量探索范围，表明其优于大型强子对撞机，并同样适用于高能正负电子对撞。
Muonphilic asymmetric dark matter at a future muon collider
研究μ子亲和非对称暗物质参数空间的现象学限制及未来μ子对撞机的探测灵敏度，考虑维数6有效算符和基于加权Lμ-Lτ的紫外模型，分析不同耦合方式对暗物质 relic 密度的影响，并评估3和10 TeV对撞机的探测能力。
As the planning stages for a high energy muon collider enter a more concrete era, an important question arises as to what new physics could be uncovered. A TeV-scale muon collider is also a vector boson fusion (VBF) factory with a very clean background, and as such it is a promising environment to look for new physics that couples to the electroweak (EW) sector. In this paper, we explore the ability of a future TeV-scale muon collider to search for Majorana and Dirac Heavy Neutral Leptons (HNLs) produced via EW bosons. Employing a model-independent, conservative approach, we present an estimat…
In modern technicolor models, there exist very narrow spin-zero and spin-one neutral technihadrons---$pi^0_T$, $rho^0_T$ and $omega_T$---with masses of a few 100 GeV. The large coupling of $π^0_T$ to $μ^+μ^-$, the direct coupling of $rho^0_T$ and $omega_T$ to the photon and $Z^0$, and the superb energy resolution of the First Muon Collider may make it possible to resolve these technihadrons and produce them at extraordinarily large rates.
Exploring muonphilic dark matter with the $Z_2$-even mediator at muon colliders
本文探讨了在muon collider中通过Z2偶媒介子探测muonphilic暗物质的可能性，针对GCE问题提出多种搜索策略并预测排除限。
The $s$-channel resonant production of the Higgs boson at a 125 GeV muon collider enables a unique way to determine the Higgs properties. However, a clear picture of the achievable Higgs precision has not yet been established. We perform a phenomenological study of the Higgs measurements at such resonant muon collider Higgs factory and present a systematic, detailed, and consistent extraction of Higgs precision measurements. Many new aspects about the lineshape scan, including the scaling with luminosity, optimal scan range, minimal scan steps, correlations with exclusive measurement, effectiv…
Construction of future Muon Collider (or dedicated mu-ring) tangential to the energy frontier pp colliders will give opportunity to realize mu-p collisions at multi-TeV center of mass energies at a luminosity of order of $10^{33}$ cm$^{-2}$s$^{-1}$ ($10^{34}$ cm$^{-2}$s$^{-1}$). Obviously, such colliders will essentially enlarge the physics search potential of corresponding muon and hadron colliders for both the SM (especially for clarifying QCD basics) and BSM phenomena. This paper is devoted to review of main parameters of mu-p colliders proposed until now.
Muon colliders might greatly extend the energy frontier of collider physics. One can contemplate circular colliders with center-of-mass energies in excess of 10 TeV. Some physics issues that might be relevant at such a machine are discussed.
We explore the sensitivity of directly testing the muon-Higgs coupling at a high-energy muon collider. This is strongly motivated if there exists new physics that is not aligned with the Standard Model Yukawa interactions which are responsible for the fermion mass generation. We illustrate a few such examples for physics beyond the Standard Model. With the accidentally small value of the muon Yukawa coupling and its subtle role in the high-energy production of multiple (vector and Higgs) bosons, we show that it is possible to measure the muon-Higgs coupling to an accuracy of ten percent for a …
Higgs-muon interactions at a multi-TeV muon collider
本文在HEFT和SMEFT框架下建立了Higgs-μ子相互作用的参数化，研究了3和10 TeV μ子对撞机通过多电弱玻色子产生过程探测该相互作用的潜力，发现其灵敏度优于高亮度LHC，且10 TeV能区表现尤为突出。
Precision test of the muon-Higgs coupling at a high-energy muon collider
本文探讨了高能μ子对撞机在精确检验μ子-Higgs耦合方面的物理潜力，分析了多电弱玻色子产生过程及标准模型背景的精确预测问题。
High luminosity muon-muon colliders would provide a powerful new probe of Higgs boson physics through $s$-channel resonance production. We discuss the prospects for detection of Higgs bosons and precision measurements of their masses and widths at such a machine.
Signatures for sleptons, which have been extensively studied for the Next Linear Collider, are reexamined taking into account some of the different features of a First Muon Collider.
The muon-proton ($μp$) collider is an interesting option of the muon collider. Here we discuss the physics potential of the $μp$ collider; especially, leptoquarks and contact interactions. We calculate the sensitivity reach for the second generation leptoquarks and leptogluons, $R$-parity violating squarks, and $μq$ contact interactions for the $μp$ colliders of various energies and luminosities.
Making the $μ$OST of the Muon Collider
本文提出利用μ子对撞机高能μ子束进行强子多维结构研究的实验方案，为下一代强子物理实验提供新途径。
A lepton collider in the multi-TeV range has the potential to measure the trilinear Higgs self-coupling constant $λ_{hhh}$ via the W-fusion mode $\ell^+\ell^- \rightarrow ν_\ell \barν_\ell h h$. In this paper we do a generator-level study to explore how center-of-mass energy spread, cone size, tracking resolution, and collision energy range affect how precisely a muon collider can measure $λ_{hhh}$ in comparison to an $e^+e^-$ collider. The smaller spread in center-of-mass energy and higher energy range of a muon collider improve cross section while the larger cone required to reduce beam-indu…
We discuss the model independent parameterization for a strongly interacting electroweak sector. Phenomenological studies are made to probe such a sector for future colliders such as the LHC, $e^+e^-$ Linear collider and a muon collider.
We analyze allowed region of muon anomalous magnetic moment (muon $g-2$), satisfying lepton flavor violations, $Z$ boson decays, and collider physics, in a framework of multi-charged particles. Then we explore the typical size of the muon $g-2$, and discuss which modes dominantly affect muon $g-2$.
A brief review of muon-collider $s$-channel Higgs physics in the Standard Model and its minimal supersymmetric extension is presented.
Muon colliders have a great potential for high-energy physics. They can offer collisions of point-like particles at very high energies, since muons can be accelerated in a ring without limitation from synchrotron radiation. However, the need for high luminosity faces technical challenges which arise from the short muon lifetime at rest and the difficulty of producing large numbers of muons in bunches with small emittance. Addressing these challenges requires the development of innovative concepts and demanding technologies. The document summarizes the work done, the progress achieved and new r…
We calculate event rate and demonstrate the observational feasibility of very high energy muons (1-1000 TeV) in a large mass underground detector operating as a pair-meter. This energy range corresponds to surface muon energies of $\sim$(5 TeV - 5000 TeV) and primary cosmic ray energies of $\sim$ (50 TeV - 5 $\times 10^4$ TeV). Such measurements would significantly assist in an improved understanding of the prompt contribution to $ν_e, ν_μ$ and $μ$ fluxes in present and future ultra-high energy neutrino detectors. In addition, they would shed light on the origin of the observed 'knee' in the c…
We study the discovery potential for heavy axion-like particles (ALPs) and the perspectives for determining their coupling properties at a muon collider. Focusing on their couplings to the Standard Model (SM) gauge bosons $γ, Z, W^\pm$, we show that a high-energy muon collider can substantially extend the mass coverage, essentially reaching the kinematic limit of the collider energy. The unique kinematics allow for non-ambiguous determination of the individual coupling strengths. The associated production via $μ^+μ^-$ annihilation and the VBF processes with the tagged outgoing muons can be uti…
Higgs Width and Couplings at High Energy Muon Colliders with Forward Muon Detection
本文提出利用高能μ子对撞机上的ZZ聚变道与前向μ子探测打破希格斯耦合-宽度简并，实现0.75%的单举产生率测量精度，并将总宽度约束在(-0.41%, +2.1%)范围内。
This contribution describes precision width measurements that could be done at a muon collider for very narrow resonances as the Higgs or a possible pseudogoldstone boson, or for almost degenerate resonances as the A0 and H0 in the MSSM for large values of tanβ.
Muon colliders are expected to naturally have a small spread in beam energy making them an ideal place to study the excitation curve. We present the parameter determinations that are possible from measuring the total cross section near threshold at a $μ^+μ^-$ collider.
Conceptual design studies are underway for muon colliders and other high-current muon storage rings that have the potential to become the first true ``neutrino factories''. Muon decays in long straight sections of the storage rings would produce precisely characterized beams of electron and muon type neutrinos of unprecedented intensity. This article reviews the prospects for these facilities to greatly extend our capabilities for neutrino experiments, largely emphasizing the physics of neutrino interactions.
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