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Wing Yan Wong24/06/2017, 16:30
At the LHC, particle physicists have been actively searching for more Higgs bosons, since the discovery of one, at 126 GeV, in 2012. The 126 GeV Higgs boson behaves like the Standard Model (SM) described. However, it is uncertain whether it is the SM Higgs or a SM-like Higgs among a larger Higgs sector in some beyond Standard Model (BSM) theories. The HKU ATLAS group is interested in the...
Go to contribution page -
Wen Han Chiu24/06/2017, 16:35
In an effective theory, the UV physics can be parametrized by a set of higher-dimensional operators. We explore the sensitivity potential at future $e^-e^+$ colliders to probe six-dinmensional operators which may deform Higgs physics at electroweak scale. Different from studies in literature, we (1) analyze the sensitivities of disentangling the single-operator contribution, under the...
Go to contribution page -
Gabriel Gallardo24/06/2017, 16:40
With searches for new physics in the ATLAS experiment at the LHC, it is possible to encounter O(100000) background events compared to O(10) expected signal events. In the face of such challenging conditions, it can be difficult to do a traditional cut-based analysis to minimize background while still preserving reasonable signal efficiency such that the limits on new physics can be extended....
Go to contribution page -
Huayong Han24/06/2017, 16:45
We have calculated the one-loop effective action in the Standard Model dimension-6 operator basis by integrating out neutralinos and charginos in Minimal Supersymmetric Standard Model (MSSM) by using the Covariant Derivative Expansion (CDE) method. The results were verified by comparing the $h\gamma \gamma$ effective coupling from these effective operators and from loop calculation or low...
Go to contribution page -
Li Huang24/06/2017, 16:50
Multi-top quark signal is very important in LHC, and the existing paper just analysis two or four top quarks channel. Six quark channel is sometimes important for it's search can shed light to top partner discovery. We want to give the constrains of six top quark of recent experiment and give some hints for experimentalist on how to find them.
Go to contribution page -
48. Light Stops, Heavy Higgs, and Heavy Gluinos in Supersymmetric Standard Models with Extra MattersTakumi Kuwahara24/06/2017, 16:55
We have explored the possibilities of scenarios with heavy gluinos and light stops in supersymmetric (SUSY) standard models with extra vector-like multiplets. If we assume the hierarchical structure for soft masses of the minimal supersymmetric standard model (MSSM) scalar fields and extra scalars, the light stop and the observed Higgs boson can be realized. While the stau is the lightest SUSY...
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Teng Ma24/06/2017, 17:00
Maximal symmetry is a novel tool for composite pseudo-Goldstone boson Higgs models: it is a remnant of an enhanced global symmetry of the composite fermion sector involving a twisting with the Higgs field. Maximal symmetry has far-reaching consequences: it ensures that the Higgs potential is finite and fully calculable, and also minimizes the tuning.
Go to contribution page -
Jia Shian Wang24/06/2017, 17:05
At the LHC, physicists have been looking for additional scalar particles since the discovery of the SM Higgs. This project investigates in the behaviour of an additional neutral scalar particle (flavon), based on a cosmological beyond standard model (BSM) scenario (Froggatt-Nielsen model), through a top flavour changing neutral current (FCNC) process (tcH) simulated by Monte Carlo (MC)...
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Suntharan Arunasalam24/06/2017, 17:10
Electroweak monopoles are spherically symmetric configurations of the gauge fields that derive their stability from their topological nature. This talk discusses the effect of regularised Cho-Maison monopoles on the strength of the electroweak phase transition and the implications of this on electroweak baryogenesis.
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Ki Lie24/06/2017, 19:30
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Taoli Cheng24/06/2017, 19:45
Since the machine learning techniques are improving rapidly, it has been shown that the image recognition technique can be used to detect jet substructure. And it turns out that deep neural networks can match or outperform traditional approach. To push it further, we investigate the Recursive Neural Networks (RecNN), which embeds jet clustering history recursively as in natural language...
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David Sutherland24/06/2017, 20:00
The original clockwork theories (1511.00132 and 1511.01827) comprise an N-site quiver of N axions, with symmetry breaking interactions arranged between them to leave a single massless mode with exponentially suppressed and (lattice) position dependent couplings to different sites. We study both clockwork's group-theoretic generalisation to quivers with different symmetry groups, and also its...
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Hiroshi Yokoya24/06/2017, 20:15
We calculate the $gg\to\gamma\gamma$ amplitude by including the $t\bar t$ bound-state effects near their mass threshold. In terms of the non-relativistic expansion of the amplitude, the LO contribution is an energy-independent term in the one-loop amplitude. We include the NLO contribution described by the non-relativistic Green function and part of the NNLO contribution. Despite a missing NLO...
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Jan Hajer24/06/2017, 20:30
Solutions to the electroweak hierarchy problem typically introduce a new symmetry to stabilize the quadratic ultraviolet sensitivity in the self-energy of the Higgs boson. The new symmetry is either broken softly or collectively, as for example in supersymmetric and little Higgs theories. At low energies such theories contain naturalness partners of the Standard Model fields which are...
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Jeremy Bernon24/06/2017, 20:45
Symmetry-based solutions of the hierarchy problem generically predict new states to cancel the Standard Model one-loop quadratic divergence of the Higgs mass. Phenomenological investigations are generally focused on the top-partners, expected to be at the TeV scale by naturalness arguments, and with model-dependent quantum numbers. While direct LHC searches have so far turned empty-handed...
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Yasuhito Sakaki24/06/2017, 21:00
We study the impact of including quark- and gluon-initiated jet discrimination in the search for strongly interacting supersymmetric particles at the LHC. Taking the example of gluino pair production, considerable improvement is observed in the LHC search reach on including the jet substructure observables to the standard kinematic variables within a multivariate analysis. In particular, quark...
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Hok Chuen Cheng24/06/2017, 21:15
We report here measurements of correlations between Lambda0-anti-Lambda0, Lambda0-Lambda0, and anti-Lambda-anti-Lambda0 hyperon pairs produced inclusively at the LHC. The analysis is based on hyperon pairs selected using the muon and minimum bias sample collected at the ATLAS experiment from proton-proton collisions at a center-of-mass energy of 7 TeV in 2010. Dynamical correlations between...
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Dmitry Chernyak25/06/2017, 09:00
Neutrinoless double beta decay is an extremely rare nuclear transition which could establish the nature of neutrino (Majorana or Dirac particle), determine the absolute neutrino mass and the neutrino-mass hierarchy, check the lepton number conservation and possible contribution of right-handed admixture to weak interaction, existence of Nambu-Goldstone bosons (majorons) and other effects...
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Wenqiang Gu25/06/2017, 09:15
In recent years, a discrepancy between the measured and the predicted antineutrino flux at nuclear reactors, the so-called โReactor Antineutrino Anomalyโ (RAA), has emerged. This implies either a bias in the theoretical calculation of the flux, or neutrino oscillation beyond the three-neutrino paradigm. A more precise determination of the antineutrino flux can shed light onto the origin of the...
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Binbin Yan25/06/2017, 09:30
The Particle and Astrophysical Xenon (PandaX) project is a series of xenon-based ultra-low background experiments in the China JinPing Underground Laboratory (CJPL) targeting the unknown physics of dark matter and neutrinos. The first and second stage experiments (PandaX-I and II) both utilize dual-phase xenon time projection chamber to carry out direct search for the dark matter particles....
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Juraj Klaric25/06/2017, 09:45
The extension of the Standard Model by heavy right-handed neutrinos can simultaneously explain the observed neutrino masses via the seesaw mechanism and the baryon asymmetry of the Universe via leptogenesis. If the mass of the heavy neutrinos is below the electroweak scale, they may be found at the LHC, BELLE II, NA62, the proposed SHiP experiment or a future high-energy collider. In this mass...
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Tian Ma25/06/2017, 10:00
The world's largest e+e- collision samples at 3.773, 4.009 and 4.18 GeV have been collected at BESIII. By analyzing the decays of D(s)+ to l+v (l=mu,tau), D to K(pi)-l+v(l=e,mu), we report the determinations of CKM matrix elements |Vcs(d)|, D(s)+ decay constants, form factors of D semi-leptonic decays. These are important to calibrate the LQCD calculations of decay constant and form factors...
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Taisiya Mineeva25/06/2017, 10:15
Hadronization is process that lays in the heart of QCD and refers to the formation of hadrons from quarks and gluons. Occurred shortly after the Big Bang when quark-gluon plasma cooled, it is currently explored using accelerator facilities and high energy collisions. Following the collision, a highly virtual parton radiates gluons or splits into a quark-antiquark pair - a process, known as...
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Martin Spinrath25/06/2017, 10:30
Neutrino mass sum rules are an important class of predictions in flavour models relating the Majorana phases to the neutrino masses. This leads, for instance, to enormous restrictions on the effective mass as probed in experiments on neutrinoless double beta decay. While up to now these sum rules have in practically all cases been taken to hold exactly, we will go here beyond that. After a...
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Beomki Yeo25/06/2017, 10:45
COMET experiment at J-PARC, Japan is aiming for the observation of charged lepton flavor violation (CLFV) process in which muon converts into electron without neutrinos. The expected single event sensitivity for this process is 3.1ร10^(-15) for Phase-1 and 2.6ร10^(-17) for Phase-2, which are the improvements of two and four orders of magnitude, respectively. In this presentation, recent...
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Po-Yen Tseng25/06/2017, 11:00
Motivated by a local 3.2-3.4 sigma resonance in WH and ZH in the ATLAS Run 2 data, we attempt to interpret the excess in terms of a W' boson in a SU(2)_1 \times SU(2)_2 \times U(1)_X model. We stretch the deviation from the alignment limit of the Equivalence Theorem, so as to maximize WH production while keeping the WZ production rate below the experimental limit. We found a viable though...
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Felix Yu25/06/2017, 11:05
We investigate the prospects for producing new, light, hidden states at a future $e^+ e^-$ collider in a Higgsed dark $U(1)_D$ model, which we call the Double Dark Portal model. The simultaneous presence of both vector and scalar portal couplings immediately modifies the Standard Model Higgsstrahlung channel, $e^+ e^- \to Zh$, at leading order in each coupling. In addition, each portal leads...
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Tianjue Min25/06/2017, 11:10
Baryonium (proton-antiproton bound state) was predicted by theory long ago but not confirmed in experiment. In this talk, we will give a brief review of observation of a baryonium candidate at the BESII and BESIII experiments. Using 58 million J/psi decay events, the BESII experiment observed the proton-antiproton mass threshold enhancement X(ppbar) in J/psi->gamma p pbar and the X(1835) in...
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Yibing Zhang25/06/2017, 11:15
The proposed MuOn-decay MEdium baseline NeuTrino beam experiment (MOMENT) is one of the neutrino experiments to measure the unknown 3-flavour frame parameter CP-violating phase. We consider the discovery reach of leptonic CP violation at MOMENT confronting with Non-standard neutrino Interactions (NSIs). We find that NSIs can induce bias in CP-violating phase measurements. We are able to...
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Ryuji Daido25/06/2017, 11:20
We propose a scenario where both inflation and dark matter are described by a single axion-like particle (ALP) in a unified manner. In a class of the minimal axion hilltop inflation, the effective masses at the maximum and mimimum of the potential have equal magnitude but opposite sign, so that the ALP inflaton is light both during inflation and in the true vacuum. After inflation, most of the...
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Tao Xu25/06/2017, 11:25
Understanding the electroweak sector of the Standard Model is one of the most important tasks in particle physics. We discuss its precise measurement at the proposed Large Hadron electron Collider(LHeC) with a focus on vector boson fusion processes. The first example is measuring charged anomalous triple gauge boson coupling(aTGC) in single W boson production process. Angular distributions of...
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Razieh Emami Meibogy25/06/2017, 11:30
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Benda Xu25/06/2017, 11:35
The XMASS program at Kamioka Observatory of Japan uses a self-shielding liquid xenon scintillator for the direct detection of dark matter and many other rare processes. The current running XMASS-I features 832kg ultra clean liquid xenon. Combined with low energy threshold of 0.3keV, XMASS-I is sensitive to low mass WIMPs and annual modulation search of dark matter.
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Sichun Sun25/06/2017, 11:40
I am going to introduce how to parametrize the Standard Model and generic new-physics contributions by an effective Lagrangian that includes higher-dimensional operators. The selected subset of operators is motivated by composite-Higgs and Higgs-inflation models. The new physics effect can be potentially discovered in multi-Higgs final states in both 14 and future 100 TeV colliders.
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In the... -
Guido D'Amico25/06/2017, 11:45
Mirror dark matter can potentially solve outstanding problems in structure formation, concerning the formation of small-scale structure on dwarf galaxy scales. We show that via its impact on residual ionization when early structure formation occurs, fragmentation into stars is naturally suppressed. The resulting formation of intermediate mass black holes in the mirror sector provides a new...
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Hoang Nhan Luu25/06/2017, 11:50
Pulsar timing array is an effective method to detect low-frequency gravitational waves. Khmelnitsky and Rubakov (2013) have proved that the oscillations in the arrival time could also be induced by the oscillations in pressure of ultralight scalar dark matter with mass around 10^{-22}. However, for simplicity, only one type of dark matter was taken into account. In this presentation, we...
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James Diacoumis25/06/2017, 13:30
The damping of perturbations in the early universe produces a distortion in the energy spectrum of the CMB photons which depends intimately on the properties of the photon temperature transfer functions. Here we propose a new method for probing dark matter models on extremely small-scales by looking at how these models affect the evolution of the photon transfer functions. We explore the...
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Inar Timiryasov25/06/2017, 13:45
The baryon asymmetry of the Universe could originate from the lepton asymmetry which was produced at relatively low temperatures. Using a model with three right-handed neutrinos ($\nu$MSM) as an example, we demonstrate how to obtain a kinetic equation for the baryon number density and show in which cases this accurate treatment could be important.
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Lucas Johns25/06/2017, 14:00
A cosmic lepton asymmetry much larger than its baryonic counterpart is a prerequisite for the resonant production of sterile neutrino dark matter and is associated with a number of baryogenesis mechanisms. Incidentally, a lepton asymmetry can also dramatically affect the flavor transformation of the active neutrinos in the early universe. I will explain how a lepton asymmetry renders the...
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Sai Wang25/06/2017, 14:15
The Advanced LIGO's discovery of gravitational-wave events GW150914 and GW151226 has stimulated extensive studies on the origin of binary black holes. Supposing the gravitational-wave events could be explained by binary primordial black hole mergers, we investigated the corresponding stochastic gravitational-wave background and pointed out the possibility to detect this background by the...
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25/06/2017, 14:30
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Benda Xu
The XMASS program at Kamioka Observatory of Japan uses a self-shielding liquid xenon scintillator for the direct detection of dark matter and many other rare processes. The current running XMASS-I features 832kg ultra clean liquid xenon. Combined with low energy threshold of 0.3keV, XMASS-I is sensitive to low mass WIMPs and annual modulation search of dark matter.
Go to contribution page -
Felix Yu
We investigate the prospects for producing new, light, hidden states at a future $e^+ e^-$ collider in a Higgsed dark $U(1)_D$ model, which we call the Double Dark Portal model. The simultaneous presence of both vector and scalar portal couplings immediately modifies the Standard Model Higgsstrahlung channel, $e^+ e^- \to Zh$, at leading order in each coupling. In addition, each portal leads...
Go to contribution page -
Tao Xu
Understanding the electroweak sector of the Standard Model is one of the most important tasks in particle physics. We discuss its precise measurement at the proposed Large Hadron electron Collider(LHeC) with a focus on vector boson fusion processes. The first example is measuring charged anomalous triple gauge boson coupling(aTGC) in single W boson production process. Angular distributions of...
Go to contribution page -
Sichun Sun
We explore axion modified photon propagating property, which put non-trivial constraints on the axion-photon coupling. It also requires the presence of additional spin-0 CP even particles such as saxion or dilaton. This discussion helps constructing theory about axion dark matter or axion inflation.
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Suntharan Arunasalam
Electroweak monopoles are spherically symmetric configurations of the gauge fields that derive their stability from their topological nature. This talk discusses the effect of regularised Cho-Maison monopoles on the strength of the electroweak phase transition and the implications of this on electroweak baryogenesis.
Go to contribution page -
Huayong Han
We have calculated the one-loop effective action in the Standard Model dimension-6 operator basis by integrating out neutralinos and charginos in Minimal Supersymmetric Standard Model (MSSM) by using the Covariant Derivative Expansion (CDE) method. The results were verified by comparing the $h\gamma \gamma$ effective coupling from these effective operators and from loop calculation or low...
Go to contribution page -
Hoang Nhan Luu
Pulsar timing array is an effective method to detect low-frequency gravitational waves. Khmelnitsky and Rubakov (2013) have proved that the oscillations in the arrival time could also be induced by the oscillations in pressure of ultralight scalar dark matter with mass around 10^{-22}. However, for simplicity, only one type of dark matter was taken into account. In this presentation, we...
Go to contribution page -
Wing Yan Wong
At the LHC, particle physicists have been actively searching for more Higgs bosons, since the discovery of one, at 126 GeV, in 2012. The 126 GeV Higgs boson behaves like the Standard Model (SM) described. However, it is uncertain whether it is the SM Higgs or a SM-like Higgs among a larger Higgs sector in some beyond Standard Model (BSM) theories. The HKU ATLAS group is interested in the...
Go to contribution page -
Po-Yen Tseng
Motivated by a local 3.2-3.4 sigma resonance in WH and ZH in the ATLAS Run 2 data, we attempt to interpret the excess in terms of a W' boson in a SU(2)_1 \times SU(2)_2 \times U(1)_X model. We stretch the deviation from the alignment limit of the Equivalence Theorem, so as to maximize WH production while keeping the WZ production rate below the experimental limit. We found a viable though...
Go to contribution page -
Takumi Kuwahara
We have explored the possibilities of scenarios with heavy gluinos and light stops in supersymmetric (SUSY) standard models with extra vector-like multiplets. If we assume the hierarchical structure for soft masses of the minimal supersymmetric standard model (MSSM) scalar fields and extra scalars, the light stop and the observed Higgs boson can be realized. While the stau is the lightest SUSY...
Go to contribution page -
Yibing Zhang
The proposed MuOn-decay MEdium baseline NeuTrino beam experiment (MOMENT) is one of the neutrino experiments to measure the unknown 3-flavour frame parameter CP-violating phase. We consider the discovery reach of leptonic CP violation at MOMENT confronting with Non-standard neutrino Interactions (NSIs). We find that NSIs can induce bias in CP-violating phase measurements. We are able to...
Go to contribution page -
Tianjue Min
Baryonium (proton-antiproton bound state) was predicted by theory long ago but not confirmed in experiment. In this talk, we will give a brief review of observation of a baryonium candidate at the BESII and BESIII experiments. Using 58 million J/psi decay events, the BESII experiment observed the proton-antiproton mass threshold enhancement X(ppbar) in J/psi->gamma p pbar and the X(1835) in...
Go to contribution page -
Gabriel Gallardo
With searches for new physics in the ATLAS experiment at the LHC, it is possible to encounter O(100000) background events compared to O(10) expected signal events. In the face of such challenging conditions, it can be difficult to do a traditional cut-based analysis to minimize background while still preserving reasonable signal efficiency such that the limits on new physics can be extended....
Go to contribution page -
Wen Han Chiu
In an effective theory, the UV physics can be parametrized by a set of higher-dimensional operators. We explore the sensitivity potential at future $e^-e^+$ colliders to probe six-dinmensional operators which may deform Higgs physics at electroweak scale. Different from studies in literature, we (1) analyze the sensitivities of disentangling the single-operator contribution, under the...
Go to contribution page -
Peter Cox, Razieh Emami Meibogy
-
Razieh Emami Meibogy
-
Li Huang
Multi-top quark signal is very important in LHC, and the existing paper just analysis two or four top quarks channel. Six quark channel is sometimes important for it's search can shed light to top partner discovery. We want to give the constrains of six top quark of recent experiment and give some hints for experimentalist on how to find them.
Go to contribution page -
Guido D'Amico
-
Ryuji Daido
We propose a scenario where both inflation and dark matter are described by a single axion-like particle (ALP) in a unified manner. In a class of the minimal axion hilltop inflation, the effective masses at the maximum and mimimum of the potential have equal magnitude but opposite sign, so that the ALP inflaton is light both during inflation and in the true vacuum. After inflation, most of the...
Go to contribution page -
Teng Ma
Maximal symmetry is a novel tool for composite pseudo-Goldstone boson Higgs models: it is a remnant of an enhanced global symmetry of the composite fermion sector involving a twisting with the Higgs field. Maximal symmetry has far-reaching consequences: it ensures that the Higgs potential is finite and fully calculable, and also minimizes the tuning.
Go to contribution page -
Jia Shian Wang
At the LHC, physicists have been looking for additional scalar particles since the discovery of the SM Higgs. This project investigates in the behaviour of an additional neutral scalar particle (flavon), based on a cosmological beyond standard model (BSM) scenario (Froggatt-Nielsen model), through a top flavour changing neutral current (FCNC) process (tcH) simulated by Monte Carlo (MC)...
Go to contribution page
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