Galaxies form in dark matter haloes. The spatial distribution of dark matter haloes, and the distribution and the number of galaxies within a dark matter halo, depend primarily on the halo mass. However, they are also known to depend on halo properties other than mass, such as halo formation history (Wechsler et al. 2006). This secondary dependence is called assembly bias. Due to dramatic...
The algebraic ER=EPR conjecture claims that the types of von Neumann algebras to which the QFT at the boundary belongs determine the emergent spacetime picture on the bulk side. Following this proposal, we explored the conjecture’s claims using the Lin-Lunin-Maldacena (LLM) system. Specifically, we began by constructing entangled quantum states in the LLM system, switched over types and saw...
Hadrons that are difficult to explain as ordinary hadrons are called exotic hadrons, and since the Belle experiment reported $X(3872)$ in 2003, a large number of exotic hadrons containing charm quarks have been reported. Some of these have the same quantum number as charmonium and are located near the mass threshold of the two hadrons. In this study, we analyze the exotic hadrons associated...
We present the first confirmation of anisotropic halo bias induced by vector dark matter/energy and anisotropic inflation. Vector dark matter/energy and anisotropic inflation models distort cosmological matter distributions. Anisotropy of matter distributions can affect halo distributions. Using cosmological N-body simulations, we show that halo bias becomes anisotropic in the presence of...
Improving the precision of the top quark mass measurement is essential for understanding the properties of the Higgs field at high energy scales and the vacuum stability of the universe. In previous measurements with inclusive top quark decays (such as the lepton + jets final state), the dominant uncertainties arose from the energy reconstruction of QCD jets. We have developed a method to...
Primordial black holes (PBHs) are black holes generated in the early universe without experience of the form of a star. It has been pointed out that PBHs may be candidates for black holes and compact objects of various masses in the universe or a major component of dark matter. In particular, PBHs have been attracting much attention in the recent development of gravitational wave observation....
A muon linear accelerator is under development at J-PARC for precise measurement of the muon anomalous magnetic moment (g-2) and electric dipole moment (EDM). The disk-and-washer (DAW) structure is employed to accelerate muons from 30% of the speed of light (kinetic energy = 4 MeV) to 70% (40 MeV) at 1296 MHz. The muon DAW consists of tanks accelerating the muons and bridge couplers that...
In the ATLAS experiment at HL-LHC, the first-level muon trigger will be redesigned to suppress the trigger rate in the high pileup environment. In the endcap region, the hit signals from thin gap chamber (TGC) are processed in XCVU13P FPGA and muon track is reconstructed. In order to suppress the trigger for particles not originating from the interaction point, the new algorithm exploits the...
The nuclear emulsion is a charged particle detector with submicron spatial resolution based on the principles of silver halide photography. Nagoya University’s nuclear emulsion film production facility produces 1,500 square meters of film annually, which is used in ongoing experiments such as neutrino interaction measurements and cosmic gamma ray observations. After each experiment, all films...
As observed in XENON1T, tritium, which exists as an impurity in liquid xenon, can potentially contribute to background signals in direct dark matter detection experiments using liquid xenon. Therefore, this study aims to measure hydrogen concentrations at the ppt level in gaseous xenon to quantitatively evaluate tritium concentration. This poster presents the current progress in trace hydrogen...
Direct dark matter search with liquid xenon such as XENONnT experiment has the best sensitivity to dark matter in the form of Weakly Interacting Massive Particles (WIMPs) today. XLZD experiment, the future direct dark matter search with about 50 tons of xenon, aims to improve the sensitivity to 10 times that of previous experiments and we need to decrease the background rate to achieve the...
In the R&D for next-generation liquid xenon-based dark matter detectors, not only the conventional dual-phase detectors using both gaseous and liquid xenon but also single-phase detectors, which do not require strict liquid level management, have been gaining attention. This study focuses on developing a single-phase liquid xenon detector and a stable electrode with microstrip-patterned metal...
The Higgs boson coupling to muons has not yet been observed, making its measurement an important target in studying the Higgs sector. The decay of the Higgs boson into a muon pair is a rare process, predicted by the Standard Model with a branching ratio of approximately 0.02%. The ATLAS experiment aims to improve the sensitivity of this search during Run 3. One of the key factors affecting the...
In this paper, we evaluate the QCD $\theta$ angle radiatively induced at the two-loop level using the dimensional regularization with the BMHV scheme in a simplified model. When the Lagrangian is promoted into $d$-dimensional space through the dimensional regularization, evanescent operators are introduced, which break the chiral symmetry. Consequently, a parity-odd fermion loop with the BMHV...
[arXiv: 2308.01336 and 2411.08737] We explore the impact of highly excited bound states on the evolution of number densities of new physics particles, specifically dark matter, in the early Universe. Focusing on dipole transitions within perturbative, unbroken gauge theories, we develop an efficient method for including around a million bound state formation and bound-to-bound transition...
It remains a big challenge to provide a theoretical explanation for confinement. The principal obstacle lies in the behavior of the QCD coupling constant. It is no longer small and thus perturbation theory becomes unusable in the low energy regime. As a promising approach to the problem, we turn to supersymmetric gauge theories, which provide analytical control. We defined a new type of...
After the dark ages of the Universe, the first generation of stars formed without any heavy elements. These metal-free stars, known as Population III (Pop III) stars, are thought to have influenced cosmic reionization, although the extent of their contribution remains uncertain. Therefore, understanding their properties is crucial for cosmology. However, direct observations remain challenging....
Lepton flavor universality violations in semileptonic b→c transitions have garnered attention over a decade. For RH_c=BR(H_b→H_cτν)/BR(H_b→H_cℓν) with ℓ being e, μ, a sum rule among RD, RD∗ and RΛc was proposed to check consistency in the experimental results independently of new physics models. We revisit this relation from the perspective of the heavy quark symmetry. We derive a sum rule...
Recent progress in the electric dipole moment (EDM) measurements of the electron using the paramagnetic atom or molecule is remarkable. In this paper, we calculate a contribution to the electron EDM at three-loop level, introducing the CP-violating Yukawa couplings of new SU(2)$_L$ multiplets. At two-loop level, the Yukawa interactions generate a CP-violating dimension-six operator, composed...
If the dark sector exists and communicates with Standard Model through the U (1) mixing, it is possible that electromagnetism would have influence on matter fields in dark sector, so-called millicharge particles (mCPs). Furthermore, the highest mCPs could be dark matter particles. Recently it has been shown that the mCPs would be slowed down and captured by the earth. As a result, the number...
We report about novel neutron interferometer using pulsed neutrons. In the case of conventional interferometer, crystal diffraction is used for splitting and superposition of neutron wave. The sensitivity of the interferometer has limitation in applicable wavelength. In addition, we must scan the phase shifter plate to get interferogram. This scanning creates the systematic uncertainty for...
The interplay between black hole interior dynamics and quantum chaos provides a crucial framework for probing quantum effects in quantum gravity. In this work, we investigate non-perturbative overlaps in Jackiw-Teitelboim (JT) gravity to uncover universal signatures of quantum chaos and quantum complexity. Taking advantage of universal spectral correlators from random matrix theory, we compute...
The Belle II detector TOP counter is a particle identification device consisting of a quartz radiator and a Micro-Channel-Plate Photomultiplier tube (MCP-PMT). The identification performance depends on the quantum efficiency (QE) of the MCP-PMT, which decreases as the integrated output charge increases, but the QE measured from the physics run data decreased faster than expected. As a possible...
Recent detections of parity violation in cosmological observations, such as galaxy clustering and cosmic microwave background anisotropies, suggest the existence of parity-violating sources in the universe. To properly extract these signals from future cosmological experiments, a thorough analysis of parity-violating signatures and exploration of relevant models are essential. In this talk, we...
In the HL-LHC ATLAS experiment, the TGC detector inside the magnetic field region will be changed from two layers to three layers in order to improve the detector redundancy and positional accuracy. Performance evaluation was conducted to install three of the new detectors during the EYETS2024, and the occupancy rate of electrical noise above 100 mV is less than 10^{-4}. In addition, quality...
Observations of cosmic gamma rays contribute greatly to cosmic ray physics by elucidating a mechanism of cosmic ray acceleration and identifying gamma-ray sources, but due to the technical difficulties of the measurement method, many parts of this field are less developed than other wavelength. In particular, the polarization of cosmic gamma rays is a physical quantity that can reveal the...
The Belle II collaboration recently announced that they observed the B→Kνν decay process for the first time. This dineutrino mode of B→Kνν has been theoretically identified as a very clean channel. However, their result encounters a 2.7σ deviation from the Standard Model (SM) calculation. On the other hand, last year, Fermilab released new data on muon g−2 away from the SM expectation with 5σ....
Recent pulsar timing arrays (PTA) observations indicate evidence of a gravitational wave background (GWB) has been detected. If supermassive black holes (SMBHs) are indeed the primary source of this signal, future PTA observations, such as those from the Square Kilometer Array (SKA), are expected to simultaneously capture multiple continuous gravitational waves (CGWs) emitted by bright...
In the decay process of B mesons, discrepancies between the predictions of the Standard Model and experimental results have been reported. These can be clues to physics beyond the Standard Model. Here, based on the R(D) anomaly, we will reveal the predictions and correlations of R2 leptoquark that could contribute to other interesting B meson decay processes.
We develop a C++ package of the STOchastic LAttice Simulation (STOLAS) of cosmic inflation. It performs the numerical lattice simulation in the application of the stochastic-δN formalism. STOLAS can directly compute the three-dimensional map of the observable curvature perturbation without estimating its statistical properties. In its application to two toy models of inflation, chaotic...
The ΛCDM model, the current standard cosmological model, is capable of describing the geometric and structural evolution of the universe and has been supported by measurements of various cosmological observables, including the large-scale structure (LSS). However, the ΛCDM model requires the assumption of the existence of unknown matter (dark matter), which is the source of the gravitational...
One of the important cosmological studies is verifying the accuracy of the standard model, and investigations of small-scale structure formation are needed. However, observations so far for scales smaller than around 100 kpc have not been conducted adequately yet. For these scales, the structures at the epoch of pre-reionization called minihalos are good targets to investigate, and it is...
The upgrade of the ATLAS detector for HL-LHC will start in 2026 towards physics run from 2030. The Sector Logic (SL) board is a part of the first stage muon trigger system. It is equipped with 20 FireFly modules for optical communication and a large-scale FPGA for trigger processing, requiring an advanced power management. The final prototype was manufactured taking into account the feedback...
We discuss the toponium formation signals at the LHC.
