Magnetic monopoles have been a subject of interest since Dirac established the relation between the existence of monopoles and charge quantization. The intense experimental search carried thus far has not met with success. We study the observability of monopoles at the Large Hadron collider in the photon-photon channel and show that LHC is an ideal machine to discover monopoles with masses below 1 TeV at present running energies and with less than 1 fb^{-1} of integrated luminosity.
Vectorlike quarks have been shown to resolve certain long-standing discrepancies pertaining to the bottom sector. We investigate, here, the prospects of identifying the existence of a topless vectorlike doublet $(B,~Y)$, as is preferred by the electroweak precision measurements. Concentrating on single production, $viz.$ $B \bar b$ with $B \to b + Z/H$ subsequently, we find that the fully hadronic decay-channel is susceptible to discovery provided jet substructure observables are used. At the 13 TeV LHC with an integrated luminosity of 300 fb$^{-1}$, a modest value of the chromomagnetic transi…
Constraining magnetic monopoles and multiply charged particles with diphoton events at the LHC
Instituto de Física Corpuscular (IFIC), CSIC – Universitat de València（粒子物理研究所，西班牙科学理事会-瓦伦西亚大学）；Department of Physics and Astronomy, University of Alabama（阿拉巴马大学物理与天文学系）
Looking for non-perturbative effects of the electroweak interaction at the LHC
我们正在考虑一种可能性，用于检测与高$p_T$光子相关的顶对产生过程中的非微扰效应。本文从一个top对与一对电弱玻色子自发产生有效相互作用的两个解出发，证明了一个有效截止为$Λ\simeq 10^2\,TeV$的解与已有的结果是矛盾的，而另一个有效截止为$Λ\simeq 10^{16}\,TeV$的解与已有的结果是矛盾的（仅仅是普朗克尺度）可以与数据相协调，并给出过程$p+p\to\bar t t γ+X$的预测，这可以在大型强子对撞机上用$\sqrt{s}=13\,TeV$有效地检查。预言的证实将有力地支持电-弱相互作用中非微扰效应的存在。
The spin 1/2 magnetic monopole pair production and the spin 0 monopolium production are studied in proton-proton collisions. For the pair production, the velocity-dependent coupling model and the additional effective coupling with a magnetic moment parameter are used for the calculation of photon fusion and Drell Yan cross sections. Since the monopole mass is unknown, the mass range employed is based on the last results of ATLAS and the MoEDAL experiment, which set a minimal value of around 2 TeV. The cross sections are calculated for the center of mass energies of the LHC, for its successor, …
Simple extensions of the Standard Model (SM) with additional Right Handed Neutrinos (RHNs) can elegantly explain the existence of small neutrino masses and their flavor mixings. Collider searches for sterile neutrinos are being actively pursued currently. Heavy RHNs may dominantly decay into $W^\pm l^\pm$ after being produced at the LHC. In this paper, we consider collider signatures of heavy pseudo-Dirac neutrinos in the context of inverse seesaw scenario, with a sizable mixing with the SM neutrinos under two different flavor structures, viz., Flavor Diagonal (FD) and Flavor Non-Diagonal (FND…
We identify potentially the world's most sensitive location to search for millicharged particles in the 10 MeV to 100 GeV mass range: the forward region at the LHC. We propose constructing a scintillator-based experiment, FORward MicrOcharge SeArch (FORMOSA) in this location, and estimate the corresponding sensitivity projection. We show that FORMOSA can discover millicharged particles in a large and unexplored parameter space, and study strongly interacting dark matter that cannot be detected by ground-based direct-detection experiments. The newly proposed LHC Forward Physics Facility (FPF) p…
We study the detection of particles with magnetic moment and no charge by using coils and solenoids. The detector uses the Faraday-Lenz law to create a current whose energy is measured. Our development can be applied to any particle with magnetic moment. The neutron is ideal to show our detector scheme for particles with long lifetimes and the result is encouraging. However, our interest lies in the detection of monopolium states which decays much faster than neutrons. The accelerator scenario with a relatively low monopole mass $\sim 1000$ GeV requires the generalization of the scheme to fini…
Photon induced processes can be used as a sensitive probe of new physics searches and can be studied using exclusive processes. These processes lead to unprecedented sensitivities on quartic anomalous couplings between photons and W and Z bosons, and new physics searches. By tagging the leading proton from the hard interaction, the Precision Proton Spectrometer (PPS) provides an increased sensitivity to select exclusive processes. PPS is designed to operate in standard high-luminosity runs at the LHC to perform measurements of e.g. the quartic gauge couplings and search for rare exclusive proc…
In this review, we discuss recent developments in both the theory and the experimental searches of magnetic monopoles in past, current and future colliders and in the Cosmos. The theoretical models include, apart from the standard Grand Unified Theories, extensions of the Standard Model that admit magnetic monopole solutions with finite energy and masses that can be as light as a few TeV. Specifically, we discuss, among other scenarios, modified Cho-Maison monopoles and magnetic monopoles in (string-inspired, higher derivative) Born-Infeld extensions of the hypercharge sector of the Standard M…
Recently, the ALICE Collaboration reported an enhancement of the yield ratio of strange and multi-strange hadrons to charged pions as a function of multiplicity at mid-rapidity in proton-proton, proton-lead, lead-lead, and xenon-xenon scattering. ALICE observations provide a strong indication that a quark-gluon plasma is partly formed in high multiplicity events of both small and large colliding systems. Motivated by ALICE's results, we propose a new test for hadronic interaction models used for analyzing ultra-high-energy-cosmic-ray (UHECR) collisions with air nuclei. The test is grounded in …
We describe pair-production models of spin-0 and spin-1/2 magnetic monopoles and high-electric-charge objects in proton-proton and heavy-ion collisions, considering both the Drell-Yan and the photon-fusion processes. In particular, we extend the Drell-Yan production model of spin-1/2 high-electric-charge objects to include $Z^0$-boson exchange for proton-proton collisions. Furthermore, we explore spin-1/2 and, for the first time, spin-0 production in ultraperipheral heavy-ion collisions. With matrix element calculations and equivalent photon fluxes implemented in MadGraph5_aMC@NLO, we present …
The search for light and long-lived particles at the LHC will be intensified in the upcoming years with a prominent role of the new FASER experiment. In this study, we discuss how FASER could independently probe such scenarios relevant for new physics searches at kaon factories. We put an emphasis on the proposed explanations for the recently observed three anomalous events in the KOTO experiment. The baseline of FASER precisely corresponds to the proposed lifetime solution to the anomaly that avoids the NA62 bounds on charged kaons. As a result, the experiment can start constraining relevant …
