We investigate the in-medium masses and decay constants of scalar $B_0^+$, $B_0^-$ and $B_{s0}$ mesons in hot and dense isospin asymmetric nuclear medium, using QCD sum rule approach and chiral SU(3) model. In chiral SU(3) model, using mean field approximation, we calculate the in-medium values of scalar fields $\sigma, \zeta, \delta$ and $\chi$. Further, the light quark condensates and gluon...
An upgrade program is planned for the LHC to increase the instantaneous luminosity up to 5x10^34 /cm^2/s to reach an integrated luminosity of 3000/fb. The CMS experiment will be equipped with an entire new tracking detector in the so-called Phase-2 Upgrade, when LHC will reach the high luminosity phase, HL-LHC. The new tracking detector must be able to fully exploit the demanding operation...
The JUNO experiment will install 25k 3-inch PMTs (SPMTs) in the gaps between 18k closely packed 20-inch PMTs (LPMTs). Both systems will detect the same IBD signals, but the SPMTs will almost always work in single photoelectron mode. As a result, they will help constrain some of the systematics in the LPMT energy reconstruction, improving the energy resolution and the sensitivity of neutrino...
We developed an X-ray detector which consisted of 36-multi-channel Yttrium OxyorthoSilicate (Y2SiO5:Ce,YSO) scintillator crystals and 36-Multi-Anode PhotoMultiplier Tubes(MAPMTs). Both YSO scintillator crystal and MAPMT have 64 channels in an 8×8 array. Therefore the X-ray detector has 2304 channels in total. The reason for choosing YSO scintillator crystal is that it has several advantages in...
The Mu2e experiment is designed to search for the charged-leptonflavor-
violating process, μ− to a e−, with unprecedented sensitivity. The
single 105-MeV electron that results from this process can be mimicked
by electrons produced by cosmic-ray muons traversing the detector. An
active veto detector surrounding the apparatus is used to detect incoming
cosmic-ray muons. To reduce the...
The Axion-gluon coupling induces an oscillating electric dipole moment (EDM) in nucleons. The axion induced oscillating EDM can be detected using storage ring EDM method with resonance between g-2 precession frequency and the oscillating EDM. Frequency range from mHz to 100 MHz can be scanned with the resonance method and below mHz down to about $10^{-9}$ Hz (assuming 4 years of measurement)...
In the multi-component configurations of dark matter phenomenology, we propose a minimal two-component one which is an extension
of the Standard Model with only three new fields; one scalar and one
fermion interact with the thermal soup through Higgs portal mediated
by the other scalar in such a way that the stabilities of dark matter candidates are made simultaneously by an explicit Z2...
The AMoRE (Advanced Molybdenum based Rare process Experiment) phase-II is an experiment to search neutrino-less double beta decay of Mo-100 which is the later phase of the AMoRE experiment. If the double beta decay is found, it means that the neutrinos are Majorana particles and we can measure their masses. The experiment is going to be carried out in the deep underground in order to observe...
At J-PARC, g-2/EDM experiment will be prepared to measure the anomalous magnetic moment of muon with high precision by producing the ultra-cold muon. The ultra-cold muon beam will be injected into the solenoidal storage magnet after acceleration to 300 MeV/c.
At the injection, it is required for the muon beam to have axisymmetric distribution for a reduction of a systematic error on the...
Since Kamiokande, the basic design of water-Cherenkov detectors has not changed: the walls of a water tank are lined with photodetectors that capture Cherenkov photons produced by relativistic particles. However, with this design the majority of photons are lost in insensitivie regions between photodetectors, while at the same time most photodetectors are outside the ring and remain dark. To...
Secluded dark matter is a model for dark matter in which dark matter particles annihilate into baryonic matter via a metastable mediator. In the case of annihilations in the sun sufficiently long-lived mediator particles can escape the solar plasma before decaying, avoiding the absorption of signal particles. This results in significantly amplified neutrino signals at energies beyond 1 TeV...
We present a unique search for vector-like T quark pair production, targeting all possible decay modes tH, tZ, and bW, of the T quark at once. We use data collected from the CMS experiment at center of mass energy of 13 TeV. We use a multivariate algorithm, the 'boosted event shape tagger' (BEST), to classify candidate jets as originating from top quarks, W, Z, or Higgs bosons. BEST uses...
We studied phonon and scintillation properties of Li$_2$MoO$_4$ crystals for the AMoRE-II (Advance Molybdenum based Rare process Experiment - phase II), an experiment aiming at detecting neutrinoless double beta decay of $^{100}$Mo. The Li$_2$MoO$_4$ is one of promising crystal candidates among molybdate crystals containing Mo element for a simultaneous detection of heat and light signals at...
High energy cosmic rays are one of the biggest concerns for a detector used in space and manned spaceflight, along with the swift development of the high energy experiments in space and spaceflight enterprise, the research of shielding materials against high energy cosmic rays has become increasingly important. In this study, by using Monte Carlo method, firstly we defined a simple detector in...
Thick Gaseous Electron Multiplier (THGEM) is one of the promising Micro-pattern Gaseous Detectors. It can be applied to Digital Hadron Calorimeter (DHCAL), TPC tracker readout, Muon detector, single photon detector, neutron imaging and so on. The attractive advantages of THGEM are high gain, robust and low cost. The moderate spacial resolution limits its applications but it is acceptable in...
The high-luminosity LHC (HL-LHC) upgrade is setting a new challenge for particle detection technologies. In the CMS muon system based on gas detectors, the increased luminosity will yield a ten times higher particle background compared to the present LHC conditions. To cope with the high-rate environment and to maintain the actual performance, new Gas Electron Multiplier (GEM) detectors will...
The AMoRE (Advanced Mo-based Rare process Experiment) is an experiment searching for a neutrinoless double beta decay of Mo-100. A pilot experiment, AMoRE Pilot, has been running with a total of ~1.8 kg of six 40Mo100MoO4 (CMO) crystals in a cryostat at the Yangyang underground laboratory (Y2L, 700 m overburden from the surface). The AMoRE muon veto counter covers the AMoRE cryostat with 10...
The AMoRE (Advanced Mo Rare process Experiment) project is the experiment searching for neutrino-less double beta decay of $^{100}$Mo.
Monte Carlo simulation using the Geant4 toolkit was performed to understand background level of detector configuration.
Decays of radioactive isotopes such as $^{232}$Th, $^{238}$U, $^{40}$k, $^{235}$U and their daughter nuclei were simulated in six...
Two body nonleptonic weak decays of bottom mesons to a pseudoscalar meson & an axial-vector meson states have been studied within the overall non-relativistic quark model. For decays involving charmed mesons, these decays have been studied by employing factorization hypothesis in heavy quark symmetry approach. A thorough analysis of charmed meson decays of B-mesons using ISGW model and lattice...
For the several decades, the non-baryonic dark matter has been searched in many ways and by many research teams. Non-baryonic dark matter is known as a weakly interaction and neutral particle. In the direct detection ways, it is not easy to identify a non-baryonic dark matter from other particles, such as gamma ray and neutron, due to its electric neutrality. So, the identification of neutral...
The AMoRE (Advanced Molybdenum based Rare process Experiment) project is an experiment aiming for searching the neutrinoless double beta decay of $^{100}$Mo. The planned technique is a combination of 200 kg of X-Molybdates (~100 kg of $^{100}$Mo and X candidates are Ca, Li, Na, and Pb.) scintillating crystals as an absorber and metallic magnetic calorimeter (MMC) sensor as a heat and light...
The ATLAS hadronic Tile Calorimeter (TileCal) is being upgraded for the High Luminosity Large Hadron Collider (HL-LHC) that will have a peak luminosity of $5 \times 10 ^{34}$ $cm^{−2}$ $s^{−1}$, five times higher than the design luminosity of the LHC. Following the R&D of the new on-detector electronics, we present a redesign of the read out link and control board, so called Daughterboard...
Based on the standard mapping, analytical formula for estimating the dynamic apertures of synchrotron particles has been established for both on-momentum and off-momentum particles. In this paper, we extended the formula of dynamic aperture considering features of a Higgs Factory. As an example, application on the dynamic aperture optimization for the CEPC (Circular Electron and Positron...
Our universe appears to break the CP symmetry in the strong interaction within the paradigm of the elementary particle physics. However, no violation has been discovered so far by experiments. To address this question further, a storage ring experiment has been proposed to search for a permanent intrinsic electric dipole moment of proton (pEDM) with the target sensitivity of $10^{-29}$ e.cm...
The CAPP-8TB axion dark matter search experiment for the mass range of 6.62 to 7.04 μeV is being performed as one of the CULTASK experiments at IBS/CAPP. The experiment utilizes the cavity haloscope technique introduced by Sikivie with a microwave resonant cavity of 3.5 L volume under 8 T superconducting magnet at a cryogenic temperature of less than 0.1 K. In this poster, details of the...
The axion is a hypothetical particle that was introduced to solve the strong CP problem. The U(1) Peccie-Quinn symmetry is spontaneously broken and dynamically produce a slowly oscillating particle axion field. The axion is also a strong candidate for dark matter. In order to search for the axionic dark matter, we use a haloscope technology which is equipped with a strong solenoid magnet and a...
The LHCb experiment has recently provided several new measurements to test the lepton flavor universality in the Standard Model (SM) and confirmed some of the prevailing anomalies from the B-meson decays in BaBar and/or Belle experiments.
We consider the setup where scalar leptoquarks or extra U(1) gauge bosons have flavor-dependent couplings to the SM. In this work, we discuss the flavor...
COSINE-100 is a dark matter direct dark matter search experiment that uses an array of scintillating NaI(Tl) crystals as a target/detector. The experiment started taking data in September 2016 and has been running stably since that time. We have fit the measured energy spectra in the NaI(Tl) crystals with a MC model that contains a variety of background components. The background sources will...
We introduce new strategy to improve the searches of the signal from gluon-pair-initiated(ggI) processes at the LHC. By the ggI process, we mean the scattering process starting from a pair of gluons which can be associated with initial-state radiation jets(ISR jets) emitted from various incident parton at hadron collision. The ggI processes include gluon-gluon fusion(ggF) into colour singlet...
We study the new numerical method to solve the Schrödinger equation with no analytic solution. As an example, we tried the Yukawa potential, which is popular in most areas of physics, especially, quark-quark interaction in high-energy physics. This method is based on the basic principle in quantum physics that all particle states are represented by the complete set of eigenbases.
In this...
The preshower detector, part of the CMS endcap electromagnetic calorimeter, is designed to have good spatial resolution to distinguish between different types of incoming particles. The preshower is a sampling detector with two layers of lead absorber, each followed by 1.9mm pitch silicon strip sensors. Each of the 4288 DC-coupled sensors has an active area of 61x61mm^2, making a total surface...
We have developed the Electromagnetic Calorimeter (ECL) trigger system for the Belle-II experiment. The ECL trigger system is based on Trigger Cell (TC) consisting of 16 CsI(Tl) crystal detectors for each. We performed the TC energy calibration using the ECL data, and the TC time-offset calibration as well. We will report the calibration method and performance of the ECL trigger system using...
The installation of scintillating pad detectors (Herschel), bracketing the LHCb detector along the beamline, have significantly enhanced LHCb's sensitivity to central exclusive production. Additionally, dedicated triggers during the early measurement period of Run 2 have produced an extended CEP dataset. A summary of results from Run 1 as well as early results from Run 2 will be shown.
Emittance scans are short van der Meer type scans performed at the beginning and at the end of LHC fills. The beams are scanned against each other in X and Y planes in 9 displacement steps and are used for LHC diagnostics and since 2017 for CMS luminosity calibration cross check. An XY pair of scans takes less than 4 minutes elapsed time. BRIL project provides to LHC three independent online...
The performance of CMS muon system is crucial for many physics results in CMS. Recently, many upgrades related to muon performance have been carried out such as the installation of new pixel detector and the development of new algorithm in muon high-level trigger. The performance of CMS muon reconstruction and identification has been studied based on the data collected with the CMS detector at...
The Belle II experiment operates at the SuperKEKB e^+ e^- energy-asymmetric collider on or near the \Upsilon(4S) resonance energy. The Belle II experiment is now in the "Phase 2" run and focusing on the search for new physics related with dark sector, axion-like particles, etc. with an intermediate luminosity on the way to reach the challenging target. To accomplish the physics goal of Phase...
The HT-KZ is an ultra-high energy cosmic rays detector system that is currently under construction at Nazarbayev University (NU), Kazakhstan. It is designed to study the spatial and temporal structure of Extensive Air Showers with the energy of the primary above ~10 17 eV, and with high time resolution of the shower disk profile and timing synchronization between the detection points (both ~1...
In the energy region of T2K beam, which is peaked around 0.6 GeV, CC1π + is a dominant channel besides CCQE. Consequently, T2K plans to include CC1π + channel as a signal channel. An evaluation of the Super Kamiokande (SK) detector related systematic errors on CC1π + needs to be done. A new hybrid sample is constructed, as it was successfully used for the evaluation of π 0 background in the SK...
The Fermilab Muon g-2 experiment aims to measure the muon anomalous magnetic moment with a 140 parts-per-billion precision to investigate the greater than 3 standard deviation difference between the Standard Model prediction and the previous measurement by the BNL Muon g-2 experiment. The coherent betatron oscillation (CBO) beam effects must be corrected for in the decay-positron time spectra...
The COSINE-100 is a direct dark matter (WIMPs) search experiment with a 106 kg array of NaI(TI) crystals at Yangyang deep underground laboratory. Dark matter search experiments require ultra-low background conditions, thus background understanding and reduction are crucial to improve the sensitivity of the detectors. One of the dominant background contributions on the NaI(Tl) crystals is...
(On behalf of the Daya Bay Collaboration)
Neutrons are an important background for underground experiments studying neutrino oscillations, searching neutrinoless double beta decay, dark matter, and other rare-event signals. This poster presents a study of neutron production by cosmogenic muons at the Daya Bay Reactor Neutrino Experiment, and gives the measurements of neutron yield for...
WZ production is one of the dominant multiboson production processes at the LHC energies. Thus, a good understanding of this process improves our understanding of the Standard Model (SM).
Specifically, the all leptonic final state constitutes an irreducible background in multiple SM and beyond the Standard Model (BSM) searches for low cross-section processes in multileptonic channels. Thus, a...
HEPS-BPIX 1M is a silicon detector with 1 million pixels, which is designed for the High Energy Photon Sources (HEPS) in Beijing, China. It is a high-frame-rate pixel detector working in the single-photon-counting mode. The frame rate is designed to 1 kHz, which leads to ~ 2GB/s high data bandwidth. The data acquisition (DAQ) system need to read out data efficiently. Meanwhile it should...
Theoretical and experimental studies have been consistently performed to search for dark matter. The project of “dark matter research cluster” supported by National Research Council of Science and Technology in Korea has done successfully to collaborate between indirect and accelerator search. Therefore, so-called “dark matter research cluster season II’ has been again approved to expand it to...
Combining high precision calorimetry with scalability to the multi-kiloton level, the Liquid Argon Time Projection Chamber (LAr TPC) has proven to be an attractive technology for long baseline neutrino oscillation experiments. An extensive R&D program for LAr TPCs at the ten-kiloton level is currently underway in the context of the Deep Underground Neutrino Experiment (DUNE). The DUNE far...
The Daya Bay Reactor Neutrino Experiment was designed to determine theta13, the smallest mixing angle in the three-neutrino mixing framework, with unprecedented precision. Daya Bay provided theta13 with the best precision and made an independent measurement of the effective mass splitting in the electron antineutrino disappearance channel. Daya Bay also performed a number of other precise...
The booster provides electron and positron beams to the CEPC collider for top-up injection at different energy.An 10 GeV linac is adopted as the injector. Then the beam energy is accelerated to specific energy according to three modes of CEPC collider ring (H, W and Z). The booster is in the same tunnel as the collider, placed above the collider ring and has exactly same survey as the collider...
The Isotope Decay-At-Rest experiment (IsoDAR) is a proposed experiment to search for sterile neutrinos by measuring neutrino oscillations. The electron-antineutrino generation requires a high intensity primary proton beam impinging on a beryllium target surrounded by lithium . In IsoDAR, H2+ ions are generated and accelerated to avoid space charge effects in the low energy region, which will...
The RENO experiment has been taking electron antineutrino data from the reactors at Hanbit nuclear power plant in Korea, using two identical detectors since 2011. It has measured the neutrino mixing angle theta13 using inverse beta decay events with a neutron captured on Gadolinium(Gd). A neutron is also captured by Hydrogen. Reactor antineutrinos are detected with a delayed signal of neutron...
The long baseline neutrino experiment T2K has launched the upgrade project of its near detector ND280, crucial to reduce the systematic uncertainty in the prediction of number of events at the far detector to less than 4%. An essential component of this upgrade is a highly segmented scintillator detector, acting as a fully active target for the neutrino interactions.
The baseline concept for...
The silicon avalanche photodiode (APD) is a highly sensitive semiconductor photo sensor that converts lights to electrons by using the photoelectric effect with a high gain through avalanche multiplication in its pn junction. It has various preferable characteristics such as operating with high quantum efficiency, large dynamic range, light-weight, robustness, insensitivity to magnetic field,...
The Standard Model in particle physics is refined. However, new physics beyond the standard model, such as dark matter, requires thousand to million times of simulation events compared to those of the Standard Model. Thus, the development of software is required, especially for the development of simulation tool kits. In addition, computing is evolving. It requires the development of the...
The Belle II experiment at the SuperKEKB e+e- collider in KEK, Japan does start physics data-taking from early of 2018 with primary physics goal that is to probe the New Physics effect using heavy quark and lepton weak decays. During trigger and DAQ operation upon beam collision, it is important that Belle II detector status have to be monitored during data-taking against an unexpected...
The main purpose of the Deep Underground Neutrino Experiment is to measure the CP-violation phase in long-baseline neutrino oscillations, proton decay and super nova neutrinos with a liquid-argon detector of unprecedented size. In order to constrain the systematics including the flux, neutrino interaction cross section, energy scale and so on, a near detector is needed to measure the...
One of the main aspects of physics beyond the standard model is the concept of extra dimensions. Among many extra dimensional cosmological models the so called DGP model (also called brane-induced gravity) with two branches is of particular interest. In this manuscript we consider the normal branch of the DGP model in which the existence of a dark energy component is necessary to explain the...
I will show how to parametrize the Standard Model and generic new-physics contributions by an effective Lagrangian that includes higher-dimensional operators and discuss the constraints from the unitarity of scattering amplitudes for 2 to 2 and 2 to 3 processes. The selected subset of operators is motivated by composite-Higgs and Higgs-inflation models. The new physics effect can be...
In many applications, there are a lot of needs for uniform distribution of cold cathode electron sources, such as microchannel plate testing, mass spectrometer electron sources that excite some samples to produce ions, etc. We use deep ultraviolet light to excite gold cathodes, or a microchannel plate with a gold cathode, using one or more microchannel plates based on different electron flow...
The Hyper-Kamiokande experiment, aiming to search for nucleon decay and study various properties of neutrinos, is expected to start in 2026. The detector is the ring imaging water Cherenkov type similar to Super-Kamiokande. The newly developed 20inch PMT will be used as photo sensors. They realize better timing resolution but the pulse shape of output signal is slightly different from the PMT...
We introduce the GAMBIT framework for global scans and its collider physics module ColliderBit, and show results from a recent scan of the electroweak fermion sector of the Minimal Supersymmetric Standard Model (MSSM) in light of LHC searches at 13 TeV and older LEP results. We take particular care to avoid assumptions from specific realizations of the MSSM that automatically prohibit very...
Large angle beam-gas scattering events are rare but can induce large betatron oscillation amplitudes, which drive particles beyond the core and into the halo region. On the other hand, small angle scattering events have higher probability and will act analogously to quantum excitation. They can dilute core the particle distribution and cause emittance growth. In this paper, numerical...
Exclusive production of four charged pions at the ep collider HERA is studied at small photon virtualities $Q^2 < 2$ GeV$^2$. The data were taken with the H1 detector in the years 2006 and 2007 at a centre-of-mass energy of $\sqrt{s}=319$ GeV and correspond to an integrated luminosity of $7.6$ pb$^{−1}$. The cross section of the reaction $\gamma p\to 2(\pi^{+}\pi^{−})Y$ is determined in the...
The Center for Axion and Precision Physics Research (CAPP) of the Institute for Basic Science (IBS) in Korea has completed the construction of the infrastructure for axion dark matter search experiments. An experiment utilizing a 9 T superconducting magnet with a 127 mm bore diameter placed in a He-3 cryogenic system is currently under preparation. This experiment will explore a broad range of...
Successful physics and performance studies of the ATLAS detector at the Large Hadron Collider rely on a large number of simulated events. The production of these simulated events with the precise detector description using GEANT4 is highly CPU intensive. With the large collision dataset expected to be collected by the ATLAS detector, the development of a simulation tool to reduce CPU...
The Multi-gap Resistive Plate Chambers (MRPCs) provide excellent timing as well as position resolutions at relatively lower cost. Therefore, they can be used in medical imaging applications such as PET where precise timing is a crucial parameter of measurement. We have designed and fabricated several six-gap glass MRPCs and extensively studied their performance. In this paper, we describe...
The matter unification, that is proposed by the Grand Unified theory (GUT),
predicts extra fields that couple to quarks and leptons, in order to realize the realistic Yukawa couplings. In a simple setup, many fields, in which Higgs $SU(2)_L$ doublets are built, are introduced and the realistic Yukawa couplings consist of the many Yukawa couplings between the Standard Model (SM) fermions and...
A possible long-term strategy for high-energy physics at colliders, after the exploitation of the LHC and its High Luminosity upgrade, considers a tunnel of about 100 km circumference, which takes advantage of the present CERN accelerator complex. The Future Circular Collider (FCC) concept follows on the successful experience and outcomes of the LEP-LHC tunnel. A possible first step of the...
We extend the research task to employ the symmetries of simple harmonic oscillator in canonical (q,p) space to more than the 3 dimensions, based on the solution of Liouville equation. It is possible to obtain some operators in which their eigen values are corresponding to quark
features, including isospin, electric charge, baryon number, hypercharge and ect. Since the extension involve the...
We suggest a new way to understand cosmic ray proton and helium by introducing discrete local sources. The source of diffusion equation of cosmic ray propagation is set to be a point source given by delta function, contrary to conventional models which have continuous sources. We calculated the spectrum of proton and helium originated in close and young supernovas. By combining the solutions...
Most of the CMS studies rely on the identification of b jets (b tagging), which is important for a broad range of analyses at CMS. Identification algorithms of jets from B hadrons heavily rely on machine learning tools and are thus natural candidates for advanced tools like deep neural networks. During the past couple of years, the CMS Collaboration has proven the power of deep neural networks...
Heavy Majorana neutrino pair productions at the LHC in minimal U(1) extended Standard Model 2017 In our recent paper [1], we explored a prospect of discovering the heavy Majorana right-handed neutrinos (RHNs) at the future LHC in the context of the minimal non-exotic U(1) extended Standard Model (SM), where a pair of RHNs are created via decay of resonantly produced massive U(1) gauge boson...
In the microwave cavity axion search method proposed by P. Sikkivi, the cavity volume, quality factor of the microwave resonant mode, and average electric potential of the mode in the direction of external magnetic field, so called geometrical factor, greatly affect the detection speed. TM010 mode of cylindrical cavity has been the only option because it promises the maximum axion searching...
The Muon g-2 Experiment (E989) at Fermilab will measure the anomalous magnetic moment of the muon, a$_\mu$ with a precision of 140 part-per-billion (ppb), aiming at resolving the >3 standard deviations between the previous measurement at Brookhaven (E821) and the Standard Model calculation of a$_\mu$.
The experimental concept uses a polarized muon beam stored in an extremely homogeneous...
The J-PARC (g-2)/EDM experiment features a novel experimental idea of the anomalous magnetic and electric dipole moments of the muon. The goals of the experiment are to improve the precision of the previous measurement of the E821 experiment at BNL that sets the measurement significantly away from theory; therefore, providing an evidence for new physics. The systematic uncertainties of the...
We report the design and construction of the trigger system for COMET Phase-I experiment of searching for cLFV of muon-electron conversion. A robust, intelligent and flexible trigger system of COMET Phase-I experiment is critical to cope with background hits rating a few MHz in Cylindrical Drift Chamber detector of COMET experiment. To establish robust links between central trigger and timing...
A Hough transform based tracking method is introduced for curling track finding of BESIII drift chamber. This track finding algorithm is implemented in the BESIII offline software system and its performance has been checked. The results show that this algorithm improves the reconstruction efficiency for the low transverse momentum tracks.
The standard muon identification of the ATLAS experiment is optimized for muons with transverse momentum (pT) above 5 GeV. However searches for low mass resonances and many B-physics measurements often need to identify muons with lower pT, where standard algorithms suffers from large backgrounds originating from sources such as hadrons decay in flight. A new "LowPt" identification has been...
The Jiangmen Underground Neutrino Observatory (JUNO), its primary goal is to determine the neutrino mass hierarchy and precisely measure the oscillation parameters by detecting reactor anti-neutrinos, is under construction. 20000 PMTs , including 5000 Hamamatsu dynode PMTs and 15000 NNVT MCP PMTs, are designed to capture photos emitting from the central detector, where the neutrinos enter and...
The experimental data taken from both Drell-Yan and deep-inelastic scattering (DIS) experiments
suggest a sign-change in $\bar d(x) - \bar u(x)$ flavor asymmetry in the proton at large values of momentum fraction $x$.
In this work, we present a phenomenological study of $\bar d(x) - \bar u(x)$ flavor asymmetry.
First, we extract the $\bar d(x)-\bar u(x)$ distribution using the more recent...
We present an inclusive search for supersymmetry with the razor kinematic variables performed using a data sample of proton-proton collisions corresponding to an integrated luminosity of 35.9 fb-1 collected with the CMS experiment in 2016 at a center-of-mass energy of 13 TeV. The search covers final states with zero or one lepton, and features event categories divided according to the number...
In this work we introduce a new channel to indirect search for the light charged Higgs bosons, which are predicted in several extensions of the standard model (SM) such as the two-Higgs-doublet models (2HDMs). We calculate the ${\cal O}(\alpha_s)$ QCD radiative corrections to the energy distribution of bottom- and charmed-flavored hadrons ($B/D$) produced in the dominant decays of the...
The search for electroweakinos and sleptons is a key component of the supersymmetry program at the LHC. In particular, natural SUSY models motivate small mass splittings between the lightest charginos and neutralinos, known as a compressed mass spectrum. Such a scenario presents several experimental challenges, since the decay products are very soft and there is little final state missing...
The Standard Model of particle physics have been extremely successful so far, but there are still many unanswered questions like the origin of neutrino mass, nature of dark matter, the source of quark and lepton flavor mixing and their possible correlation, the theory of grand unification of all SM interactions. In this talk I will focus on some interesting models that attempt to answer these...
The Jiangmen Underground Neutrino Observatory (JUNO), a 20-kton multi-purpose underground liquid scintillator (LS) detector equipped with about 50k PMTs, is under construction at Kaiping, Guangdong Province in China. The primary scientific goal is to determine the neutrino mass hierarchy (MH), which requires the unprecedented energy resolution of 3%/√E. Consequently, thorough calibration of...
The semileptonic form factors, at zero and non-zero recoil, of $B\to D^{(\ast)}\ell\nu$ decays are needed to determine the $V_{cb}$, a Cabibbo-Kobayashi-Maskawa (CKM) matrix element. Typically in the Unitarity Triangle (UT) analysis for the quark flavor mixing angles and the CP violating phase, $V_{cb}$ enters as a normalization of $\vert V_{ub}\vert/\vert V_{cb}\vert$ or with $\varepsilon_K...
CEPC is the future Circular Electron and Positron Collider proposed by China to mainly study the Higgs boson. This paper will present the bean optics design of the collider ring for the concept design report. The compatible beam optics for W and Z mode will be presented as well.
We investigate light dark matter scenarios where annihilation to Standard Model particles at tree-level is kinematically forbidden. In such cases annihilation can be aided by massive Standard Model-like species, called assisters, in the initial state that enhances the available phase space opening up novel tree-level processes. We investigate the feasibility of such non-standard assisted...
Beyond the Standard Model ideas include lightweight (sub-GeV) Dark Matter candidates. We postulate that they could be produced within the NuMI beam at Fermilab. The NOvA neutrino experiment has recorded ~10e20 protons on target, which correspond to millions of neutrino interaction events in its low-Z, 300-ton, off-axis Near Detector. Among these neutrinos, we search, in a model agnostic way,...
IBS/CAPP has launched CAPP-PACE, direct axion detection experiment aimed at the mass range of 2.45~2.75 GHz. In the present detector setup, we utilize 1K (ultra-low noise temperature) HEMT amplifier which is the world-best available commercial silicon-based low temperature amplifier. However, in order to reach QCD axion sensitivity and speed up the experiment, we are currently examining the...
We developed light detectors to measure scintillation signals from simultaneous phonon-scintillation detection system for rare-event search experiments. The light detector is composed of a two-inch Ge or Si wafer and a low-temperature sensor called Metallic Magnetic Calorimeter (MMC) operated at milli-Kelvin range. The light detector showed promising performance for neutrinoless double beta...
The Muon g-2 Experiment (E989) at Fermilab will measure the anomalous magnetic moment of the muon, a$_\mu$ with a precision of 140 part-per-billion (ppb), aiming at resolving the >3 standard deviations between the previous measurement at Brookhaven (E821) and the Standard Model calculation of a$_\mu$.
The experimental concept requires a precise measurement of the magnetic field of the 45-m...
We present a theoretical analysis of possible influence of neutrino magnetic moments on the propagation of ultrahigh-energy (UHE) cosmic neutrinos in the interstellar space under the assumption of two-neutrino mixing. The exact solution of the effective equation for neutrino evolution in the presence of a magnetic field and matter is obtained, which accounts for four neutrino species...
The isotopes of 8He and 9Li produced by cosmic-rays are a main source for backgrounds in reactor neutrino experiments. The isotope decays to a neutron and an electron and mimics an inverse beta decay of an electron antineutrino from reactors. The 8He/9Li background spectrum and rate are measured using the data taken by the RENO experiment, and compared the with Monte-Carlo prediction. In this...
The CMS muon system presently consists of three detector technologies equipping different regions of the spectrometer. Drift Tube chambers (DT) are installed in the muon system barrel, while Cathode Strip Chambers (CSC) cover the end-caps; both serve as tracking and triggering detectors. Moreover, Resistive Plate Chambers (RPC) complement DT and CSC in barrel and end-caps respectively and are...
The ALICE (A Large Ion Collider Experiment) detector at the LHC is designed
to study the properties of Quark-Gluon Plasma (QGP), a deconfined state of
quarks and gluons produced in the ultrarelativistic heavy ions collisions.
Heavy-quarks, charm and beauty, are considered as effective probes for the
investigation of the QGP properties. Due to their large masses they are
produced almost...
Normalized differential cross sections for top quark pair production are measured in the dilepton ($e^{+}e^{-}$, $mu^{+}mu^{-}$, and $mu^{-+}e^{+-}$) decay channels in proton-proton collisions at a center-of-mass energy of 13\TeV. The measurements are performed with data corresponding to an integrated luminosity of 2.1\fbinv using the CMS detector at the LHC. The cross sections are measured...
In direct detection of WIMP dark matter particles, scintillation crystals such as NaI(Tl) are commonly used as targets/detectors. Interactions between WIMP and the crystal are expected to produce nuclear recoils, while energy calibrations for the crystal are done with gamma sources that produce electron recoils. Since the light yields from electron and nuclear recoils of the same energy are...
The Muon Ionization Cooling Experiment (MICE) collaboration will demonstrate feasibility of ionization cooling, the technique proposed to cool the muon beam at a future neutrino factory or muon collider. The muon beam parameters are measured on a sample built on a particle-by-particle basis, before and after the cooling cell using high precision sci-fibre trackers in a solenoid magnetic field....
Techniques have been developed to determine the single upset rates in individual pixels in the innermost layer of the ATLAS pixel detector, called IBL. SIngle pixel SEU cannot be observed directly through error reporting of the pixels as there is no such function, nor is there real time monitoring of configuration during operation. Through analysis of cluster data from physics running and...
We present the first measurement of branching fraction for a rare tau decay, $\tau^{\pm} \rightarrow \pi^{\pm} e^+ e^- \nu_\tau$, using a 562 $fb^{-1}$ dataset collected with Belle detector at the KEKB asymmetric-energy e+e- collider. The $\gamma^{*}W^{*}\pi$ vertex involved in this decay provides unique knowledge to study the dynamics of strong interactions at the energy scale of tau mass....
The exclusive photoproduction reaction $\gamma p -> \psi(2S) p$ has been studied with the ZEUS detector in $ep$ collisions at HERA using an integrated luminosity of 350 pb$^{-1}$, in the kinematic range 30 $< W <$ 180 GeV, $Q^2$ < 1 GeV$^2$, $|t|$ < 5 GeV$^2$, where $W$ is the photon proton centre-of-mass energy, $Q^2$ is the photon virtuality and t is the four-momentum transfer at the proton...
Tau leptons play an important role in many Standard Model and Beyond the Standard Model physics processes that are being investigated at the LHC. This poster details measurements of the performance of the reconstruction and identification of hadronic tau lepton decays using the ATLAS detector. The measurements include the performance of the identification, trigger, energy calibration and decay...
RENO has been taking data since August, 2011 and successfully measured the smallest neutrino mixing angle, theta13. The measurement values are obtained from the observed reactor antineutrino events with neutron captures on gadolinium (n-Gd) in the target detector region. In addition, RENO has successfully measured the mixing angle as well, using an independent sample with neutron captures on...
The measurement of the cross section ratio σt ̄tbb ̄ / σt ̄tjj is performed in pp collisions at √s = 13 TeV with the CMS detector at the LHC. Events with two leptons (e or μ) and at least four reconstructed jets, including at least two identified as b quark jets, in the final state are selected. The ratio is measured at the particle in visible phase space and the parton level in the full phase...
Two major experiments, the AMoRE (Advanced Mo based Rare process Experiment) searching for neutrino-less double beta decay and the COSINE searching for dark matter WIMPs (Weakly Interacting Massive Particles), are running in the Yangyang underground laboratory (Y2L). To understand their signals, it is necessary to know the backgrounds from their detector materials like fasteners, crystal,...
Measurements of differential ttbar production cross sections are presented in the single-lepton decay channel, as a function of a number of kinematic event variables. The measurements are performed with proton-proton collision data collected by the CMS experiment at the LHC during 2016 at sqrt(s) = 13 TeV, with an integrated luminosity of 35.9 fbinv. The data are compared to a variety of...
AMoRE (Advanced Mo-based Rare process Experiment) is an experimental search for neutrinoless double beta decay of Mo-100. A pilot experiment, AMoRE-Pilot, has been operating with six 40Ca100MoO4 (CMO) crystals, total mass 1.9 kg, in a cryostat at the Yangyang underground laboratory (Y2L), with an overburden of 700 m. It is unavoidable that the materials of the crystals suffer from some...
Measurements of the environmental neutron flux in the vicinity of dark matter search experiments are important because signals induced by these neutrons can mimic those that are expected from dark matter interactions. In order to establish a systematic understanding of the environmental neutron flux at the location of the COSINE-100 experiment, we developed a liquid scintillator neutron...
The energy sawtooth will be significant in the future circular Higgs factory with beam energy as high as 120 GeV. For the partial double ring scheme, unlike the double ring scheme, the effects of energy sawtooth can't be corrected by tapering the magnet strength with beam energy along beamline. In this paper, the energy sawtooth effects in the partial double ring scheme and its mitigation...
Silicon pixel detectors are at the core of the current and planned upgrade of the ATLAS detector at the Large Hadron Collider (LHC). As the closest detector component to the interaction point, these detectors will be subjected to a significant amount of radiation over their lifetime: prior to the High-Luminosity LHC (HL-LHC), the innermost layers will receive a fluence in excess of 10^15...
COSINE-100 is a direct detection dark matter experiment consisting of 106 kg of low-background NaI(Tl) crystal detectors located at the Yangyang Underground Laboratory in South Korea. The primary physics goal of COSINE-100 is to search for a WIMP-induced annual modulation signal to confirm or refute DAMA/LIBRA’s claim of dark matter discovery. The search for an annual modulation signal...
The COSINE experiment has been taking physics data which aim to confirm or refute the annual modulation signal reported by DAMA/LIBRA by using the same technique. In order to tag and suppress cosmic-ray muons, a muon detector was constructed using plastic scintillator panels that completely surround the crystal detector array. High energy muons in the NaI(Tl) crystals and low energy...
Because of hygroscopic property of NaI(Tl) crystal, meticulous care should be taken when handling and encapsulating the crystal. Encapsulation with little surface radioactive background is critical in building low-background rare search experiment.
One of possible method for the background reduction is encapsulation with active veto counter, such as liquid scintillator. Alpha events from...
The phenomena of neutrino oscillations can proceed only in the case of the coherent superposition of neutrino mass states. An external environment can modify a neutrino evolution in a way that conditions for the coherent superposition of neutrino mass states are violated. Such a violation results in quantum decoherence of neutrino states and leads to suppression of flavor neutrino...
We consider neutrino spin oscillations in arbitrary moving matter accounting for the longitudinal $\bf{j}_{\parallel}$ and transversal $\bf{j}_{\perp}$ matter currents in respect to the direction of the neutrino propagation. From the quasiclassical treatment to the problem, based on the generalized Bargmann-Michel-Telegdi equation that describes the evolution of the three-dimensional neutrino...
We consider the Standard model extended by fermion and scalar singles.
These singlet can account for the generation of neutrino mass at the
TeV scale and the existence of dark. For the neutrino
sector we consider models with extra singlet fermions which can generate
neutrino mass via the inverse seesaw mechanism whereas
a singlet scalar is introduced as the candidate for dark matter. We...
In cavity-based axion dark matter search experiments exploring high mass regions, arrays of multiple cavities are typically considered to increase the detection volume within a given magnet bore. We, IBS/CAPP at KAIST, introduce a new idea, referred to as pizza-cylinder cavity, which is superior to a conventional multiple-cavity detector in terms of detection volume, simplicity of the...
The purpose of J-PARC KOTO experiment is to search for a rare Kaon decay, $K_L\rightarrow\pi^0\nu\bar{\nu}$. This decay violates CP symmetry and is highly suppressed in the Standard Model (SM). The SM predicts its branching ratio as $BR = (3.0 \pm 0.3) \times 10^{-11}$, and the deviation of the measured BR from the prediction signifies the existence of new physics.
The KOTO detector consists...
Two-particle femtoscopic correlations between non-identical charged particles for different charge combinations are measured in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV with ALICE at the LHC. The three-dimensional two-particle correlation functions and double ratios in the out-side-long pair rest frame as well as in terms of an infinite set of one-dimensional spherical harmonics are...
We further develop recently proposed new approach to description of the relativistic neutrino flavour $\nu_e^L \leftrightarrow \nu_{\mu}^L$, spin $\nu_e^L \leftrightarrow \nu_{e}^R$ and spin-flavour $\nu_e^L \leftrightarrow \nu_{\mu}^R$ oscillations in a constant magnetic field that is based on the use of the exact neutrino stationary states in the magnetic field. The neutrino flavour, spin...
The Belle II at the SuperKEKB collider in Japan has been constructed toward a physics run in early of 2018 with an ultimate target of 40 times higher instantaneous luminosity than the KEKB collider, which was 2.1×10^34/cm^2s.
The main physics motivation is to search for the New Physics from heavy quark/lepton flavor decays.
We have upgraded the Electromagnetic Calorimeter(ECL) hardware trigger...
The identification of jets originating from b-quarks is of great importance to many physics analyses. For this reason, a great deal of effort has been put into developing several algorithms that can efficiently distinguish b-jets from light and c-jets. These algorithms typically use information regarding reconstructed objects such as the jet's tracks, secondary vertices and jet-associated...
After the Higgs discovery, precise measurements become vital for the experimental particle physics. A powerful Higgs/Z factory, the Circular electron-positron Collider is proposed. Adequate reconstruction and detector design are fundamental to this project. Arbor algorithm has been optimized to fulfill the CEPC physics requirements and is used as the core for the CEPC physics...
The J-PARC KOTO experiment is searching for the KL->pi0nunubar decay which is sensitive to New Physics. A main feature the signal is that only two photons are observed in a hermetic detector system. Therefore, it is important to detect all decay particles from the KL decay. A 5.5-m long cylindrical Lead/Scintillator sandwich sampling calorimeter surrounds the fiducial KL decay region to detect...
The spectroscopy of charmonium-like states together with the spectroscopy of charmed and strange baryons is discussed. It is a good testing tool for the theories of strong interactions, including: QCD in both the perturbative and non-perturbative regimes, LQCD, potential mod-els and phenomenological models [1, 2, 3]. An understanding of the baryon spectrum is one of the primary goals of...
We present a simulation to calculate heat signal spectrum from low temperature bolometer attached to a crystal. This implementation is based on the elementary acoustic wave theory at low temperature, and has been developed using modern Monte Carlo techniques by tracking individual phonon's polarization, wave, and group velocity vectors in anisotropic media. Physical processes include phonon...
Ultra-peripheral collisions (UPCs) of heavy ions involve long-range interactions at impact parameters larger than the sum of their radii. Therefore, the hadronic interactions are largely suppressed in UPC. Though there are no hadronic processes in UPC, the jets can be produced via some other ways, such as gamma-nucleus interactions. The study of di-jet photoproduction by gamma-nucleus...
Ultra-peripheral collisions (UPCs) of heavy ions involve long-range interactions at impact parameters larger than the sum of their radii, for which the hadronic interactions are largely suppressed. In such UPC events, the jets can be produced in processes such as gamma-nucleus interactions. The study of di-jet photoproduction by gamma-nucleus interactions at high energy offer a unique...
After the Higgs discovery, precise measurements of the Higgs properties and the electroweak observables become vital for the experimental particle physics. A powerful Higgs/Z factory, the Circular Electron Positron Collider (CEPC) is proposed. The Particle Flow oriented detector design is proposed to the CEPC and a Particle Flow algorithm, Arbor has been designed and optimized accordingly.
In...
The Korean Neutrino Observatory (KNO) is proposed as a next generation underground neutrino detector in Korea. The detector is a 260 kiloton water Cherenkov detector and can serve as the second detector of Hyper-Kamiokande experiment. By detecting J- PARC neutrino beam in these two detectors in Korea and Japan at the same time, the measurement of neutrino oscillation parameters such as...
Two main aims of the SHiP (Search for Hidden Particles) experiment are the observation of hidden particles and high-statistics study of tau neutrino events. These particles can be produced from the decay of charmed particles in the SHiP hybrid target which is composed of a totally 58-cm long series of TZM slabs followed by Tungsten slabs of the same total length. A major concern for the...
The Higgs boson quartic couplings and their beta functions appear to be tantalisingly close to zero it the Planck scale. We investigate extended Higgs models, including extra Higgs doublets and/or singlets, to see if the vanishing of quartile couplings can be made exact while still producing the correct Higgs mass and satisfying experimental constraints.
The RENO experiment has measured the neutrino mixing angle θ_13 and dm^2_ee, using reactor antineutrinos from the reactors at Hanbit Nuclear Power Plant since Aug. 2011. In 2016, RENO published results on sin^2(2θ_13) and dm^2_ee using the energy dependent oscillation of reactor antineutrinos in the 500days of data. RENO has accumulated roughly ~2000 days of data with reduced backgrounds and...
We find that an evidence of primary (conformal) photons and their disappearance is a signal of phase transition in the vicinity of the Critical Point. The novel approach to an approximate scale symmetry breaking is developed for this. A scalar dilaton could be the dominant messenger between conformal sector and Standard Model. The origin of primary photons is conformal anomaly through the...
Large Hadron Collider (LHC) continued studying detail of Higgs boson properties and put bounds on beyond standard models. However electron positron colliders with precise knowledge of the initial-state beams, low backgrounds and sensitivity to small energy depositions would provide a perfect environment to precision study of standard model and discovery of new particles.
We consider a beyond...
The recursive jigsaw reconstruction technique provides a powerful way to tackle challenging SUSY final states with multiple missing particles. By altering the input "decay tree" we demonstrate a new approach to considering compressed SUSY signatures from a variety of different sources. The imposition of this decay tree provides a clear way to define which objects are associated with decay...
A search for the associated production of dark matter with a Higgs boson which decays into two photons is presented. The search uses data from proton-proton collisions at a center-of-mass energy of 13 TeV, collected with the CMS detector at the LHC in 2016, corresponding to an integrated luminosity of 35.9 fb−1. Results are interpreted in the context of two dark matter models: a...
The spectroscopy of charmonium-like mesons with masses above the DD\bar threshold has been full of surprises and remains poorly understood. The currently most compelling the-oretical descriptions of the mysterious XYZ mesons attributes them to higher lying char-monum states, hybrid structure with a tightly bound cc\bar diquark or a cq(cq')\bar tetraquark core that strongly couples to S-wave...
The Advanced Mo based Rare process Experiment (AMoRE) is a series of experiments focused on searching for the neutrinoless double beta (0νββ) decay of 100Mo. Molybdenum based single crystals of high purity are used as scintillating elements of detector. Sensitivity of the AMoRE detector is limited by the background in the region of the expected peak, the main source of the background forced...
The IBS Center for Axion and Precision Physics Research (CAPP) explores for dark matter axions with tunable resonant cavities immersed in a strong magnetic field to boost the axion-to-photon conversion when a cavity mode resonates with the axion mass. Deposition of superconducting thin films on the inner surface of the cavity increases Q factor of the cavity and thereby enhances the conversion...
The purpose of the Axion Resonant InterAction DetectioN Experiment (ARIADNE)[1] is to detect axion mediated macroscopic interactions between polarized and unpolarized masses using NMR techniques. This experiment is a collaboration among institutes in Korea, IBS/CAPP and KRISS, and US institutes, Northwestern, Stanford, and Indiana University. Wilczek and Moody[2] predicted the possible...
The Muon Ionization Cooling Experiment (MICE) has measured the evolution of beam emittance due to ionization cooling. In MICE, a muon beam is focused onto an absorber using a large aperture solenoid. Lithium hydride and liquid hydrogen absorbers have been studied. Diagnostic devices are placed upstream and downstream of the focus, enabling the phase space coordinates of individual muons to be...
The COSINE project is aimed at direct detection of dark matter experiment[1]. WIMPs(Weakly Interacting Massive Particles) are one of the most attractive candidates of dark matter[2, 3] but, only DAMA/LIBRA experiment has claimed the detection of a WIMPs[4]. To confirm or exclude the DAMA/LIBRA’s modulation results, COSINE is going to achieve ultra-low background and lower energy threshold than...
Abstract: The transit time spread (TTS) is an important parameter of photomultiplier tube in the high energy physics field. By the software of CST and Matlab, the theoretical model of the photomultiplier tube structure was established, and the particle sources theoretical model was established according to the M-C integral sampling method of cosine distribution. Based on the establishment of...
The KOTO experiment aims to explore physics beyond the Standard Model (SM) by measuring the branching ratio of $K_L\rightarrow\pi^{0}\nu\bar{\nu}$, which is predicted to be $(3.0\pm0.3)\times10^{-11}$ by the SM[1]. The $K_L\rightarrow\pi^{0}\nu\bar{\nu}$ decay is characterized by a pair of photons from the $\pi^0$ decay and no other detected particles. The decay is identified by observing two...
Properties of the discovered 125 GeV Higgs boson are in good agreement with the predictions of the Standard Model (SM). However, the current precision of these measurements, allows models, such as Supersymmetry, with extended Higgs sectors, in which the discovered Higgs boson is only one of several Higgs bosons. The work focuses on the search for high mass Higgs bosons in a final state with...
A search for new-physics signals resulting in energetic, high-multiplicity final states, such as black holes, string balls, and electroweak sphalerons, is presented using a data sample corresponding to an integrated luminosity of 35.9 $\text{fb}^{-1}$ collected with the CMS experiment at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV in 2016. Standard model...
A search for a dark matter candidate in association with a Higgs
boson decaying to two photons based on 36.1 fb$^{-1}$ data collected with the
ATLAS detector at the LHC at the energy of 13 TeV will be presented. The
results are interpreted in in different benchmark models: a baryonic Z' model
and a two-Higgs-doublet-model with a Z' boson.
We present a search for dark matter particles production in association with a hadronically decaying vector boson with 36.1 fb$^{-1}$ of pp collision data at a center-of-mass energy of $\sqrt{s}$ = 13 TeV recorded by the ATLAS detector at the LHC. In addition to hadronic decays of W and Z bosons, also the decays of a new non-Standard-Model vector boson Z$^{\prime}$ of unknown mass are...
The quark and lepton sectors of the standard model (SM) are strikingly similar in terms of the number of particles and generations. This hints at a fundamental symmetry existing between the two sectors. Indeed, such a symmetry is part of many beyond-the-SM theories such as composite models, technicolor, grand unified SU(5), Pati-Salam SU(4) and E6 superstring-inspired theories. These models...
With increasing dataset at the LHC, it is of importance to search for rare processes such as flavor changing neutral current. The search for flavor changing neutral current with the Higgs boson and the top quark has been performed. The Higgs boson decaying to a pair of b jets is considered. To exploit the large dateset, a machine learning technique like deep learning is used.
Recent results on the searches for four-top-quark production are presented. Searches for four-top-quark production, in the single-lepton (1L), opposite and same-sign (2OSL and 2SSL) dilepton and multilepton (3L) final states are summarised. Special focus is given to the 1L and 2OSL channels, where a data-driven method is developed as an estimate for the dominant background from top-quark pair...
We present searches on Heavy Majorana neutrinos in the events with same-sign lepton paris and jets, using the pp collision data collected from CMS detector at the centre-of-mass energy 13 TeV. The search range is extened to 20 GeV and 1500 GeV, lower and upper bound respectively, compared to the previous analysis using 8 TeV data. Vector boson fusion production channel is considered as well as...
Several theoretical models accomodate the possibility of Heavy Stable Charged Particles (HSCP). With improved data aquisition in the phase-II upgrade of the CMS-RPC system, triggering and identification of HSCPs are expected to be possible using the Time of Flight technique. Moreover, new RPC chambers will be installed to extend the acceptance coverage up to |η|<2.4 with improved time and...
The Standard Model (SM) very successfully describes experimental
observations, but is known to be an incomplete theory. Measurements of SM
parameters and checks of its self consistency are important to improve our
understanding of nature. An important parameter to understand electroweak
symmetry breaking is the Higgs boson self-coupling, which can be
accessed in Higgs boson pair production....
A great success of the Standard Model (SM) was the discovery of a
Higgs boson in 2012. Measuring its properties and yet unobserved production
and decay modes provides a test of the validity of the SM. The process of Higgs
production in association with a pair of top-quarks ($t\bar{t}H$) is still
unobserved. Further interest arises from the fact that it provides direct
access to the top...
A search for heavy resonances decaying into four-lepton final states in pp collisions is performed. This search is based on the data collected in CMS detector at the LHC. The full 2016 dataset corresponding to an integrated luminosity of 36 /fb at the center-of-mass energy of 13 TeV is used. Benchmark signal samples are generated using Monte Carlo simulation. Event selection takes into account...
This search focuses on high-mass resonances using the latest data collected by the ATLAS detector at the LHC, which has an unprecedented centre-of-mass energy of 13 TeV. The search is conducted for resonant new phenomena in dimuon final states. The dimuon invariant mass spectrum is the discriminating variable used in this search. No significant deviations from the Standard Model expectation...
A search for new high-mass resonances decaying into electron or muon pairs is performed using full data obtained from 2016 proton-proton collisions at 13 TeV. The search exploits data collected by the CMS experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 36 /fb. No significant deviations are observed from the Standard-model expectation. Upper limits...
The detection of the SM H→μμ decay is important to study the Higgs
boson Yukawa couplings to the 2nd generation fermions. Discovering the signal
of Higgs boson decay to dimuon is extremely challenging due to the small decay
branching fraction (2.2x10-4) and very large irreducible background from
Drell-Yan production at the LHC. The search for the H→μμ decay has been a high
profile...
The RENO experiment has successfully measured $θ_{13}$ using the disappearance of electron anti-neutrinos in three-flavor neutrino oscillations.We search for sterile neutrinos in four-flavor oscillation model using roughly 1500 days of data collected by the RENO experiment. We have not seen any positive signal and obtain an excluded region of the oscillation parameters. We present an excluded...
Searches for supersymmetry are presented that target the direct and indirect stau pair production. The analyses exploit the final states with two taus of opposite charge and significant missing transverse momentum. The results are based on a data set of proton-proton collisions, recorded by the CMS experiment at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of...
Precise measurement of the Electric Dipole Moment (EDM) and anomalous magnetic moment ($g$-2) of particles is an important test of Beyond Standard Model (BSM) physics. It is generally believed that the tau lepton couples more strongly to BSM due to its large mass, but searching for tau EDM and $g$-2 has been difficult because it is highly unstable and the neutrinos from its decay are...
This poster presents the search for a Higgs boson decaying into dileptons plus a photon. This topology has contributions from Z boson and a photon or two photons, one of which has an internal conversion into a lepton pair. This is one of the important rare Higgs decay channels and can be used to probe new physics as well. The results with the data collected by the CMS detector at the LHC from...
Latest results on searches for supersymmetric top quarks are presented, focusing on the final states with two leptons. The results are based on a data set of proton-proton collisions, recorded by CMS at a center-of-mass energy of 13 TeV during 2016 and corresponding to an integrated luminosity of 36.5 fb-1. The results are interpreted as exclusion limits on T2tt simplified models.
Looking for supersymmetry, the search for a scalar partner of the top quark plays a major part due to its role in stabilising the Higgs boson mass. In the parameter space where a decay of a top squark into a top quark and the neutralino, a Dark Matter candidate, is possible, searches asking for either zero or one charged lepton are most sensitive. Events with an isolated electron or muon...
A search for top quark pair production in association with a Higgs boson in sqrt(s) = 13 TeV pp collisions is presented. The search, performed in a dataset of 35.9 fb^{-1} collected by the CMS detector along the year 2016, is performed in channels with at least two same-sign leptons and b-jets, targeting the WW^, ZZ^ and tautau decay modes of the Higgs boson. A best fit of 1.5 \pm 0.5 times...
Search for the Standard Model Z and Higgs boson decaying into a J/psi and a photon, with subsequent decay of the J/psi into dimuon pair will be presented. The analysis is performed using data recorded by CMS detector from proton-proton collisions at 13 TeV in 2016. The latest results of the limits on the Z/Higgs -> J/psi+photon decay branching fraction will be shown in this poster.
A search for Zgamma resonances using leptonic and hadronic final states is presented. The analysis is based on data from proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 /fb, and collected with the CMS detector at the LHC in 2016. The search strategy is to look for an excess above the non-resonant Standard Model background on the...
Searches for a weakly interacting particle candidate (WIMP) for dark matter at the Large hadron Collider complement the WIMP direct detection experiments and is one of the major physics goals of the LHC. A series of analyses in CMS (and ATLAS) are aimed at detecting events where a pair of WIMPs may have been produced and recoiled against a visible particle. Such events give rise to final...
The Jiangmen Underground Neutrino Observatory (JUNO) is a 20 kton liquid scintillator detector with primary physics goal of neutrino mass hierarchy determination. One of the key parameters is that the energy resolution of the JUNO should reach 3%@1MeV, totally 20,000 20’’ PMTs will be used, including 15000 MCP-PMTs from NNVT and 5000 dynode PMTs from Hamamatsu. For better performances and...
The IBS center for axion and precision physics research (CAPP) conducts haloscope axion search whose method uses a cavity resonator capable of scanning a range of frequencies using a special tuning system. The relic axions passing through the detector are converted into microwave photons inside the resonator via Primakoff effect. The converted photons are coupled to an RF transmission line...
It is very important to monitor the amount of radon (Rn-222) in the underground experiments such as rare decay search and dark matter experiments with ultra low background requirements. The radioactivity from the radon can be a significant background source to the experiments and need to be measured precisely. We upgraded a radon detector with a volume of ~70 L which was used in the KIMS...
The instantaneous luminosity of the Large Hadron Collider (LHC) at CERN will be increased up to a factor of seven with respect to the original design value to explore higher energy scale. In order to benefit from the expected high luminosity performance, the first station of the ATLAS muon end-cap Small Wheel system will be replaced by a New Small Wheel (NSW) detector. The NSW provide precise...
Supernova(SN) 1987A was the first detected neutrino burst in neutrino experiment. The Jiangmen Underground Neutrino Observatory(JUNO) is an upcoming large liquid scintillator detector experiment with an expected 3% energy resolution at 1 MeV and abundant light yield. These properties make JUNO a powerful SN neutrino detector. In this poster, we present our simulation studies on SN neutrino...
The Belle II experiment at KEK in Japan start beam collision from early of 2018 to probe a New Physics beyond the Standard Model by measuring CP violation phenomena and rare decays of beauty, charm quark and tau lepton. The experiment is performed at the SuperKEKB e+e- collider with 80×10^{34}cm^{−2}s^{−1} as an ultimate instantaneous luminosity. As a severe beam background environment is...
During operation at instantaneous luminosities of up to 1.5 /s/cm^2 the frontend chips of the ATLAS innermost pixel layer (IBL) experienced single event upsets affecting its global registers as well as the settings for the individual pixels, causing, amongst other things loss of occupancy, noisy pixels, and silent pixels. A quantitative analysis of the single event upsets as well as the...
We reexamine a renormalizable model of a fermionic dark matter with a gauge singlet Dirac fermion and a real singlet scalar which can ameliorate the scalar mass hierarchy problem of the Standard Model (SM). Our model setup is the minimal extension of the SM for which a realistic dark matter (DM) candidate is provided and the cancellation of one-loop quadratic divergence to the scalar masses...
As higher mass particles are eliminated as possibilities in the search for dark matter, it is important to explore new types of detectors that are more specialized at looking for lower mass particles. For this purpose, I've been exploring super-cooled water as a target material for future detectors. This talk will go over the motivations for a detector of this type, the evidence that has been...
The Daya Bay experiment has measured sinSq(2theta13) and Delta(mSq32) with better than 4% precision using an IBD sample tagged via neutron capture on gadolinium (nGd). A precise and independent measurement of the oscillation parameters can be done with IBDs tagged via neutron capture on Hydrogen (nH), a statistically distinct sample with largely different systematic uncertainties. Effort has...
The spin light of neutrino (SLν) [1] is the electromagnetic radiation emitted by a neutrino due to its magnetic moment when the particle is moving in external environments, i.e. in the presence of matter and/or electromagnetic or gravitational fields [1-3]. Within the developed quantum theory of SLν in matter [4-6] it has been shown that the efficiency of this radiation increases with...
$K_L^0 \rightarrow \pi^0 \gamma \gamma$ has been predicted by $\mathscr{O}(6)$ calculation in chiral perturbation theory (ChPT) with the inclusion of the vector meson exchange terms. An effective coupling constant $\alpha_V$ was introduced to incorporate with the vector meson contributions. This decay mode is also crucial for the determination of the direct CP violation amplitude of $K_L^0...
We consider an $S^{1}/\mathbb{Z}_2$ compactified flat extra dimensional scenario where all the standard model states can access the bulk and have generalised brane localised kinetic terms. The flavour structure of brane kinetic terms for the standard model fermions are dictated by stringent flavour bounds on the first two generations implying an $U(2){Q_L} \otimes U(2){u_R} \otimes...
The Korean Neutrino Observatory(KNO) is proposed as a next generation underground neutrino observatory in Korea consisting of 260 ton water Cherenkov detector and can serve as the second detector of Hyper-Kamiokande experiment.
By detecting J-PARC neutrino beam in these two detectors at the same time, neutrino oscillation parameters such as leptonic CP violation phase and the neutrino mass...
The Korean Neutrino Observatory(KNO), consisting of a 260 kton water Cherenkov detector, is proposed to be built in Korea. KNO will be another far detector at a distance of ~1100 km from the J-PARC where an off-axis neutrino beam is produced. Because of the KNO located in the second oscillation maximum, KNO will enhance the sensitivity of determining the leptonic CP violation phase and the...
We present the studies of initial state radiations (ISR) in Drell-Yan events from ppbar collisions at sqrt{s}=1.96TeV with CDF Run II data. ISR from hadron collisions plays an important role in jet physics, which has an impact on precision measurements and searches for new physics. We develop a systematic way to study the ISR effect using Drell-Yan events. The truncated mean of the dilepton...
500 pb$^{-1}$ of data have been collected by BESIII between 2.0GeV and 3.08 GeV. Recent results on the line-shape of $e^+e^- \to \phi \pi \pi, K^+K^-, 2(K^+K^-), \phi \eta, \phi \eta’, \omega \pi^0, \omega \eta$ are reported. Possible new resonances in these channels are studied, in particular the $\phi(2170)$, that may be the strange partner of the Y(4260).
We study the performance of jet substructure variables with a detector designed for very high energy proton collisions, the SiFCC detector. The two-prong jets from Z'->WW and three-prong jets from Z'->ttbar are compared with the background from light quark jets at the same energy. The calorimeter geometry is benchmarked in various configurations in order to understand the impact of granularity...
We study the performance of jet substructure variables with a detector designed for very high energy proton collisions, the SiFCC detector. The two-prong jets from Z'->WW and three-prong jets from Z'->ttbar are compared with the background from light quark jets at the same energy. The calorimeter geometry is benchmarked in various configurations in order to understand the impact of granularity...
The JSNS2 experiment will search for a sterile neutrino with short baseline (~24m) using a high intensity neutrino beam produced from muon decays at rest at J-PARC MLF (Material and Life science experimental Facility). The experiment considers use of 10-inch Hamamatsu PMTs that are also used by RENO and Double Chooz. A study has been made to understand the PMT saturation behavior with various...
Heavy quarks, charm and beauty, are expected to be effective probes for the hot and dense medium (QGP) produced in high-energy heavy-ion collisions. They are produced in the early stage of the collision, almost exclusively in hard partonic scattering, and therefore they experience the full evolution of the QGP allowing to study the in-medium partonic energy-loss. In particular, the...
Studies of the differential Drell-Yan cross sections in the dilepton channel are presented. The analysis is based on data taken with the CMS detector at a proton-proton center of mass energy of 13 TeV. The cross sections are studied as a function of dilepton invariant mass and rapidity. Backgrounds are estimated using data-driven methods, and corrections including detector effects are discussed.
After the discovery of the Higgs boson, the precision measurements
of its properties and comparison with the Standard Model (SM) predictions
became a crucial part of the LHC physics programme. A potential observation
of deviations may lead to the indirect discovery of physics beyond the Standard
Model (BSM). The direct observation of the coupling of the Higgs boson to
leptons and its...
In an axion dark matter search haloscope experiment, the noise temperature of a linear amplifier is a crucial component that seriously affects the sensitivity of the dark matter axion search. In the CAPP18T experiment at CAPP/IBS in KAIST, we use a cryogenically cooled Josephson Parametric Amplifier (JPA) in order to amplify weak RF signals from a resonant cavity. In this presentation, we...
Using the spherical secondary electron emission coefficient measuring device, the primary current and the secondary current of the secondary electron emission process are simultaneously measured by the collection method and the principle of charge conservation, and the surface of the sample is neutralized by charge during the measurement process. Under the small error, the secondary electron...
About 23% of the energy density of the universe is considered to be in a form of non-baryonic dark matter. One of the strong candidates of dark matter is a hypothetical particle called the axion. In an axion dark matter search haloscope experiment, axions coherently scatter off the magnetic-field potential in a frequency-tunable resonant cavity. A dynamic frequency tuning in the resonant...
The ATLAS distributed computing system has allowed the experiment to successfully meet the challenges of LHC Run 2. In order for distributed computing to operate smoothly and efficiently, several support teams are organized in the ATLAS experiment. The ADCoS (ATLAS Distributed Computing Operation Shifts) is a dedicated group of shifters who follow and report failing jobs, failing data...
The COSINE-100 experiment is searching for the direct detection of weakly interacting massive particles (WIMP) using an array of ultra-low background NaI(Tl) scintillation crystals attached with the PMTs. The next phase of the experiment, COSINE-200, requires crystal background levels that are well below, and light yields are well above, the DAMA/LIBRA detector. Thus, the study of temperature...
ATLAS electron and photon triggers covering transverse energies from 5 GeV to several TeV are essential to record signals for a wide variety of physics: from Standard Model processes to searches for new phenomena. To cope with ever increasing luminosity and more challenging pile-up conditions at a centre-of-mass energy of 13 TeV, the trigger selections need to be optimized to control the rates...
The CMS experiment implements a sophisticated two-level triggering system composed of Level-1, instrumented by custom-design hardware boards, and a software High Level Trigger. A new Level-1 trigger architecture with improved performance is now being used to maintain high physics efficiency for the more challenging luminosity conditions experienced during Run II. The CMS muon detector was...
The Global Network of Optical Magnetometers to search for Exotic physics (GNOME) is an experiment looking for transient events of axion domain walls from the gradient coupling of axion field with atomic spins [1][2]. GNOME is based on synchronized measurements from multiple GPS-timed magnetometer stations located in geographically separated places on the Earth [3]. While a single magnetometer...
In order to accomplish its wide program of physics measurements, the LHCb collaboration has developed in the past years a complex of algorithms for the reconstruction of the trajectories of charged particles, taking into account the heterogeneous structure of the LHCb tracking system. Several data-driven approaches have been conceived to provide a precise evaluation of the tracking efficiency,...
Latest results of CMS searches for a Higgs boson produced in association with top quarks in final states with tau leptons will be presented. The poster will specifically focus on technical aspects related to the Matrix Element Method implementation and on its impact on the sensitivity of the analysis. The analysis presented here uses proton-proton collision data collected at center-of-mass...
The advent of approaches based on the Euclidean space for studying hadron observables, as e.g. by lattice QCD and Schwinger-Dyson equations, has been remarkable and responsible to produce important understanding on non-perturbative physical systems.
However, the quantum field theory formulation in Minkowski space has subtle essential signatures as, for instance, related with spin degrees of...
The role of environment in galaxies evolution is a highlight knowledge for probing the structure formation and evolution.Because of that, we select two different galaxies categorize for its investigation. In this work, For studying the role of environmental effects on properties of both active galactic nuclei(AGN) and star formation(SFR) galaxies, we have considered two environment...
The JUNO (Jiangmen Underground Neutrino Observatory) experiment is under preparation in China. The project's main goal is to determine the neutrino mass ordering via the precise measurement of the energy spectrum of antineutrinos emitted from nuclear reactors located 53km from the JUNO detector. Data taking is expected to begin in 2021.
In order to achieve JUNO's goals, it is essential to be...
A Pilot experiment of CULTASK (CAPP’s Ultra Low Temperature Axion Search in Korea) started to take axion data in the frequency range between 2.45~2.75GHz with a specially designed microwave cavity. The conventional design, i.e., the open cylinder with two disk shaped endcaps, creates critical reduction on quality factor (Q factor) of the cavity due to the perpendicular crossing between the...
We utilize the nonlinear sigma model for large N as an effective theory for low-energy QCD to study the thermodynamical behavior of a pion gas through a virial expansion of pressure. In particular, we determine the entropy density, specific heat, trace anomaly, and the speed of sound, to find a signature of the deconfinament phase transitions. After considering below critical regimes and...
The main purpose of the Deep Underground Neutrino Experiment is to measure the CP-violation phase in long-baseline neutrino oscillations, proton decay and super nova neutrinos with a liquid-argon detector of unprecedented size.
In order to constrain the systematics including the flux, neutrino interaction cross section, energy scale and so on, a near detector is needed to measure the...
Top quark pairs in association with final state particles are produced in large quantities at the LHC due to the high centre-of-mass energy available in proton-proton collisions. One such topology is that of a prompt photon radiated from the top-quark in addition to the final state particles from the top-quark decay. Presented are the results from the ATLAS experiment, which measured the...
The track finding with GPU-implemented Runge-Kutta (RK) fourth order tracks is investigated to track the electrons from the muon conversion in the COMET drift chamber. In the COMET drfit chamber, about 40 % of signal events are composed of multiple turns where the right hits assignment to each turn track is significant in the track finding. Scanning all possible initial track parameters can...
During 2017, the Large Hadron Collider provided record-breaking integrated and instantaneous luminosities, resulting in huge amounts of data being provided with numbers of interaction per bunch crossing significantly beyond initial projections. In spite of these challenging conditions, the ATLAS Inner Detector (ID) track reconstruction continued to perform excellently, and this contribution...
The Compact Muon Solenoid (CMS) experiment implements a sophisticated two-level triggering system composed of the Level-1, instrumented by custom-design hardware boards, and a software High Level Trigger. A new Level-1 trigger architecture with improved performance is now being used to maintain high physics efficiency for the more challenging conditions experienced during Run II. In this...
Hadronic signatures are critical to the ATLAS physics program, and are used extensively for both Standard Model measurements and searches for new physics. These signatures include generic quark and gluon jets, as well as jets originating from b-quarks or the decay of massive particles (such as electroweak bosons or top quarks). Additionally, missing transverse momentum from non-interacting...
We present a search for the standard model Higgs boson decaying into b quarks and produced in association with a pair of top quarks in the leptonic final states. This search has been performed on the full 13-TeV dataset of proton-proton collisions collected by the CMS experiment at the LHC in 2016. To separate the tt̄H signal from the irreducible tt̄ + bb̄ background, this analysis takes...
We present a search for the standard model Higgs boson decaying into b quarks and produced in association with a pair of top quarks decaying in the all-jet final state. This search is performed on the full 13-TeV dataset of proton-proton collisions collected by the CMS experiment at the LHC in 2016. To separate the tt̄H signal from the irreducible tt̄ + bb̄ background, this analysis takes...
An angular correlation between trigger-jet and high-transverse momentum particles observed in AA collisions at the RHIC is well known for ridge structure. This phenomenon is well explained from the hydrodynamical model and it has been a strong evidence of the QGP generation. However, recently the ridge structure has also been reported in high multiplicity pp collisions at LHC. In pp...
The upgrade of the ATLAS tracking detector for the High-Luminosity Large Hadron Collider at CERN requires the development of novel radiation hard silicon sensor technologies. For the development of depleted CMOS sensors for ATLAS we combined small electrodes with minimal capacitance and advanced processing for fully depleted active sensor volume to achieve radiation hard CMOS sensors in line...
The more precise measurement of theta13 is valuable for determining the CP violating phase if combined with an accelerator neutrino beam experimental result. We plan to upgrade the RENO facility to make a precise measurement of theta13 and dm_ee^2 and to solve the problem of the 5 MeV excess in the measured reactor neutrino spectrum. We propose to add more identical near and far detectors and...
At the High Luminosity LHC (HL-LHC), the CMS experiment will face a harsh environment with a high instantaneous luminosity up to 5x10^34/cm^2/s corresponding to an average of 140-200 multiple proton-proton collisions per bunch crossing. The main goal of the CMS Level 1 trigger (L1T) upgrade for the HL-LHC is to maintain trigger thresholds that are as low as possible and comparable to those...
To guarantee smooth and uninterrupted luminosity measurements the CMS experiment is equipped in Run II with three online luminometers: the Pixel Luminosity Telescope (PLT), the Fast Beam Condition Monitor (BCM1F) and the Forward Calorimeter (HF). For the offline luminosity measurement and a cross check of the online detectors the pixel detector is used (Pixel Cluster Counting, PCC). For the...
It was theoretically shown that axions can be detected by converting them to microwave photons inside high-Q cavity resonators in the presence of a strong magnetic field [1]. In such experiments, very weak microwave signals should be scanned in a wide frequency range. The best semiconductor amplifiers have a lowest noise temperature plateau of about 1.1 K even at significantly lower ambient...
