综述了在对撞机上寻找类轴子粒子(ALP)的现状和前景,主要集中在欧洲核子研究中心(CERN)大型强子对撞机上。在大型强子对撞机上,通过寻找二光子、三光子和四光子终态中的新$a\toγγ$共振,已经对质量超过几个GeV的耦合到光子以及Z玻色子或希格斯玻色子的ALP进行了限制。分析了质子-质子和铅-铅碰撞中的包容和排斥双光子pp,PbPb $\to a \to γγ(+X)$,以及奇异Z和Higgs玻色子衰变pp $\to \mathrm{Z},\mathrm{H}\to aγ\to 3γ$和pp $\to \mathrm{H}\to aa \to 4γ$.排他搜索PbPb碰撞提供了最好的排除限制ALP群众$m_a\approx 5-$ 100 GeV,而其他渠道是最有竞争力的$m_a\approx 100$ GeV $-$ 2.6 TeV。在95%的置信水平下,排除了高达$\sim$ 100 nb的集成ALP生产截面,对应于在宽质量范围内对低至$g_{aγ}\approx$ 0.05 TeV $^{-1}$的轴子-光子耦合的约束。预计在未来十年,在LHC接近$g_{aγ}\approx 10^{-3}$ TeV $^{-1}$时,$-$ 100的这些限制将比$m_a\approx 1$ GeV $-$ 5 TeV提高10倍。
英文摘要:
The current status and future prospects of searches for axion-like particles (ALPs) at colliders, mostly focused on the CERN LHC, are summarized. Constraints on ALPs with masses above a few GeV that couple to photons, as well as to Z or Higgs bosons, have been set at the LHC through searches for new $a\toγγ$ resonances in di-, tri-, and four-photon final states. Inclusive and exclusive diphotons in proton-proton and lead-lead collisions, pp, PbPb $\to a \to γγ(+X)$, as well as exotic Z and Higgs boson decays, pp $\to \mathrm{Z},\mathrm{H}\to aγ\to 3γ$ and pp $\to \mathrm{H}\to aa \to 4γ$, have been analyzed. Exclusive searches in PbPb collisions provide the best exclusion limits for ALP masses $m_a\approx 5-$100 GeV, whereas the other channels are the most competitive ones over $m_a\approx 100$ GeV$-$2.6 TeV. Integrated ALP production cross sections up to $\sim$100 nb are excluded at 95% confidence level, corresponding to constraints on axion-photon couplings down to $g_{aγ}\approx$ 0.05 TeV$^{-1}$, over broad mass ranges. Factors of 10$-$100 improvements in these limits are expected at the LHC approaching $g_{aγ}\approx 10^{-3}$ TeV$^{-1}$ over $m_a\approx 1$ GeV$-$5 TeV in the next decade.
Bridging the divide: axion searches and axino phenomenology at colliders
University of Chicago(芝加哥大学);Enrico Fermi Institute, University of Chicago(恩里科·费米研究所,芝加哥大学);Kavli Institute for Cosmological Physics, University of Chicago(卡弗里宇宙物理学研究所,芝加哥大学);Leinweber Institute for Theoretical Physics, University of Chicago(莱因韦伯理论物理研究所,芝加哥大学);Kavli Institute for Physics and Mathematics of the Universe (WPI)(宇宙物理与数学卡弗里研究所(WPI));The University of Tokyo Institutes for Advanced Study(东京大学高等研究院);The University of Tokyo(东京大学)
Single-Point Search for eV-scale Axion-like particles with Variable-Angle Three-Beam Stimulated Resonant Photon Collider
Graduate School of Advanced Science and Engineering, Hiroshima University(广岛大学先进理工学研究科);International Center for Quantum-field Measurement Systems for Studies of the Universe and Particles (QUP), KEK(高能加速器研究机构宇宙与粒子研究量子场测量系统国际中心);Institute for Chemical Research, Kyoto University(京都大学化学研究所);Research Institute of Science and Technology, Tokai University(东海大学科学技术研究院)
Non-Resonant Searches for Axion-Like Particles at the LHC
我们提出了一个新的碰撞探测器的轴子样粒子(ALP),更一般的伪戈德斯通玻色子:非共振搜索,利用其与标准模型粒子的相互作用的衍生性质。ALP可以作为离壳介体参与LHC等对撞机上$2 \to 2$散射过程的$s$通道。我们通过使用Run 2 CMS公共数据推导ALP耦合到规范玻色子的新限制来增强这种新型搜索的能力,通过过程$p p \to Z Z$,$p p \to γγ$和$p p \to j j$,探测ALP参数空间中以前未探索的区域。此外,我们提出了未来的非共振搜索涉及ALP耦合到其他电弱玻色子和/或希格斯粒子。
Production of axionlike particles in $PbPb$ collisions at the LHC, HE -- LHC and FCC: A phenomenological analysis
考虑到大型强子对撞机(LHC)下一轮运行的能量以及未来高能LHC(HE-LHC)和未来圆形对撞机(FCC)的能量,研究了超周边$PbPb$碰撞(UPHIC)中类轴子粒子(ALP)的产生.假设四种不同的组合ALP质量和耦合和典型的排他性削减中央和前向检测器,我们估计的横截面和不变的质量,快度,横向动量和{共面}分布与双光子的最终状态中产生的$γγ\rightarrow a \rightarrow γγ$子过程。对背景进行了详细的分析。我们表明,背景可以大大减少排他性削减和前向检测器,作为LHCb,是理想的探测小质量的ALP。最后,我们的结果表明,未来的实验分析的双光子末态在UPHIC可以探测类轴子粒子的存在和性质。
Cornering MeV-GeV Axions and Dark Photons with LDMX
SLAC National Accelerator Laboratory(斯坦福直线加速器中心);Department of Physics, Stanford University(斯坦福大学物理系);Leinweber Institute for Theoretical Physics(莱因韦伯理论物理研究所)
Search for sub-eV axion-like particles in a stimulated resonant photon-photon collider with two laser beams based on a novel method to discriminate pressure-independent components