Prof.
Liming Zhang
(Tsinghua University)
12/20/18, 2:00 PM
Heavy Flavor
I will review the pentaquark study at LHCb and show the prospect with full LHCb data taking from 2011 to 2018.
Dr
Da Xu
(IHEP, Beijing)
12/20/18, 2:00 PM
Beyond Standard Model
The institute of high energy physics (IHEP) plays a leading role in various SUSY searches: inclusive and electroweak SUSY searches with light leptons or taus. The talk gives an overview of SUSY search activities at IHEP, as well as the near-future plan and the long-term prospect.
王妹 查
(中国科学技术大学近代物理系)
12/20/18, 2:00 PM
Heavy Ions
The coherent photon-nucleus and photon-photon interactions has been studied in detail to probe the gluon distribution in nucleus and to test QED via relativistic heavy-ion collisions. These kind of interactions are traditionally thought to be only exist in ultra-peripheral collisions (UPC), where there is no hadronic interactions. Recently, significant excess of $J/\psi$ yield and dielectron...
Mr
Zhuoran Huang
(IHEP)
12/20/18, 2:15 PM
Heavy Flavor
In this work, we perform a combined analysis of the R(D), R(D*) and R(J/psi) anomalies in a model-independent
manner based on the general framework of the four-fermion effective field theory, with paying special attention to the employ of the hadronic form factors. For the B->D(D*) transition form factors, we use the HQET parametrization that include the higher order corrections of...
Mr
Yang LIU
(IHEP)
12/20/18, 2:15 PM
Beyond Standard Model
As the major SUSY search group in China, we have participated in many kinds of SUSY scenario searches including inclusive and electroweakino (EWK) SUSY searches with leptons. This talk shows you the results we had during run2 for inclusive Same-Sign or three lepton (SS/3L) search, inclusive one lepton search, and EWK C1N2/C1C1 with two taus search.
ZUMAN ZHANG
(ccnu)
12/20/18, 2:15 PM
Heavy Ions
In this talk, measurements of RAA and v2 of open heavy-flavour hadrons via semi-leptonic decays to electrons at mid-rapidity and muons at forward rapidity in Pb-Pb collisions at LHC energies will be discussed. The progresses on the analysis of the production and anisotropy of electrons from beauty-hadron decays will be also discussed. In addition the RAA of heavy- flavour hadron decay leptons...
Mr
Huajie Cheng
(高能所)
12/20/18, 2:30 PM
Beyond Standard Model
Several analyses searching for chargino and neutralino pair production in different decay final states are ongoing. These searches use 13 TeV datasets collected by the ATLAS and CMS. The results, strategies and outlook of these analyses will be presented.
Menglin Xu
(Central China Normal University)
12/20/18, 2:30 PM
Heavy Flavor
The doubly charmed baryon decay Xicc++->Xic+pi+ is observed for the first time, with a statistical significance of 5.9σ, confirming a recent observation of the baryon in the Lambdac+k-pi+pi+ final state. The data sample used corresponds to an integrated luminosity of 1.7fb−1, collected by the LHCb experiment in pp collisions at a center-of-mass energy of 13TeV. The Xicc mass is measured to...
xinye peng
(Central China Normal University)
12/20/18, 2:30 PM
Heavy Ions
Heavy quarks (charm and beauty) are a powerful probe of the Quark-Gluon Plasma (QGP) formed in high-energy heavy-ion collisions. They are produced in hard scattering processes on a timescale shorter than the QGP formation time and experience the whole system evolution. The measurement of the nuclear modification factor ($R_{\rm AA}$) of open heavy flavours can provide important information...
Mr
Ao Xu
(清华大学)
12/20/18, 2:45 PM
Heavy Flavor
The Doubly charmed baryon $\Xi_{cc}^{++}$ was observed by the LHCb experiment in 2017. Measurements of its properties will allow for precise tests of QCD, the theory of strong interactions, in a unique environment. In this talk, we present the first measurement of the lifetime of the doubly charmed baryon $\Xi_{cc}^{++}$, with signals reconstructed in the final states $\Lambda_c^+ K^- \pi^+...
Dr
Jiayin Sun
(Tsinghua University)
12/20/18, 2:45 PM
Heavy Flavor
Production of open heavy flavor in pPb collisions provides insight on the cold nuclear matter effects, and acts as a crucial reference measurement to AA collisions in order to disentangle cold nuclear matter effects from the QGP-related effects. The LHCb experiment has measured the production cross section of open charm and beauty hadrons in proton-lead collisions in the forward rapidity...
ChenZheng Zhu
(S)
12/20/18, 2:45 PM
Beyond Standard Model
Supersymmetry (SUSY) is a promising extension of the SM of particle physics. If the chargino and neutralinos are to heavy to be produced, the direct slepton production will be dominant at LHC. Co-annihilation processes favour a light stau that has a small mass splitting with a bino LSP, which can provide a relic density similar current dark matter cosmological observations. This talk gives a...
Prof.
Fei Wang
(Department of Physics, ZhengZhou University)
12/20/18, 3:00 PM
Beyond Standard Model
Mr
jiajia Qin
(中国科学院大学物理学院)
12/20/18, 3:00 PM
Heavy Flavor
The production cross-sections of $\Upsilon(1S)$, $\Upsilon(2S)$ and $\Upsilon(3S)$ mesons in proton-proton collisions at $\sqrt{s}=13$ TeV are measured with a data sample corresponding to an integrated luminosity of $277 ± 11$ pb$^{−1}$ recorded by the LHCb experiment in 2015. The $\Upsilon$ mesons are reconstructed in the decay mode $\Upsilon\to\mu^{+}\mu^{-}$. The differential production...
Ning-Bo Chang
(Xinyang Normal Univerisity)
12/20/18, 3:00 PM
Heavy Ions
With our coupled jet-fluid model [1, 2, 3], we study the nuclear modifications of full jets and jet structures for single inclusive jet, dijet and gamma-jet events in Pb+Pb collisions at both 2.76 TeV and 5.02 TeV. The evolution of full jet shower is studied via a set of coupled transport equations including the effects of collisional energy loss, transverse momentum broadening and...
Ms
Yongzhen HOU
(presentation)
12/20/18, 3:15 PM
Heavy Ions
A jet is a spray of collimated hadrons originated in the fragmentation of an energetic parton. The cross section measurement provides a good test for pQCD calculations, and jet production in pp collisions constitutes a reference for jet quenching study in nucleus-nucleus collisions. In addition, the measurements in different multiplicity intervals will provide insights to understand ...
Ling-Xiao Xu
(Peking University)
12/20/18, 3:15 PM
Beyond Standard Model
We build a minimal neutral naturalness model in which the top partners are not charged under QCD, with a pseudo Goldstone Higgs arising from SO(5)/SO(4) breaking. The color-neutral top partners generate the Higgs potential radiatively without quadratic divergence. The misalignment between the electroweak scale and global symmetry breaking scale is naturally obtained from suppression of the...
Dr
Jianguo Bian
(IHEP)
12/20/18, 3:15 PM
Heavy Flavor
The first measurements of the underlying event activity in top quark and antiquark pair production are presented.
The measurements are performed in proton-proton collisions at a center-of-mass energy of 13 TeV, and are based on data collected by the CMS experiment at the LHC in 2016 corresponding to an integrated luminosity of 35.9 fb-1. In each event, the contribution from the underlying...
Mr
Di Wang
(School of Nuclear Science and Technology, Lanzhou University)
12/20/18, 3:30 PM
Heavy Flavor
A new $CP$-violation effect is found in charm decays into neutral kaons:
the interference between two tree (Cabibbo-favored
and doubly Cabibbo-suppressed) amplitudes with the mixing of final-state
mesons. This effect, estimated to be of order of $10^{-3}$, is much
larger than the direct $CP$ asymmetries in these decays, but missed in
the literature. It can be revealed by measuring the...
Mr
Kun Jiang
(University of Science and Technology of China)
12/20/18, 3:30 PM
Heavy Ions
Hard scattered partons lose their energy when propagating through the hot dense medium created in relativistic heavy ion collision. Jets are excellent probes to study parton energy loss mechanisms. Experimentally high transverse momentum ($p_T$) trigger particles are taken as proxies of jets. Di-hadron correlation measurements in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV will be presented in...
Prof.
Jing Shu
(ITP-CAS)
12/20/18, 3:30 PM
Beyond Standard Model
We present the most general sum rules reflecting the cancellation of ultraviolet divergences in the Higgs potential in weakly-coupled, natural extensions of the Standard Model. There is a separate sum rule for the cancellation of the quadratic and logarithmic divergences, and their forms depend on whether the divergences are canceled by same-spin or opposite-spin partners. These sum rules can...
Prof.
Xing-Bo Yuan
(Central China Normal University)
12/20/18, 3:45 PM
Heavy Flavor
乐 张
(Hubei Normal University)
12/20/18, 3:45 PM
Heavy Ions
We study the medium-induced gluon emission process experienced by a hard jet parton propagating through dense nuclear matter in the framework of deep inelastic scattering off a large nucleus.
We work **beyond collinear rescattering expansion and soft gluon emission limit**, and derive **a closed formula for medium-induced single gluon emission from a heavy or light quark jet** interacting...
ZHANG Yu
(IHEP)
12/20/18, 3:45 PM
Beyond Standard Model
Di-Higgs production is important for Higgs self-coupling measurement, BSM heavy Higgs search and search for anomalous coupling etc. WWyy has clean background and good mass resolution from diphoton final state and large branching ratio from WW.
A search for di-Higgs is performed on ATLAS detector with 36 $fb^{-1}$ dataset. The upper limit is set.
Dr
Shao-Feng Ge
(IPMU & UC Berkeley)
12/20/18, 4:30 PM
Beyond Standard Model
Gluon-gluon to photon-photon scattering gg→γγ offers to the LHC experiments a uniquely powerful probe of dimension-8 operators in the Standard Model Effective Field Theory (SMEFT) that are quadratic in both the electromagnetic and gluonic field-strength tensors, such as would appear in the Born-Infeld extension of the Standard Model (SM). We use 13-TeV ATLAS data on the production of isolated...
Dr
Javier Merino
(Institute of High Energy Physics)
, Mr
Mengran Li
(Institute of High Energy Physics)
12/20/18, 4:30 PM
A study of the performance of the hadronic recoil in inclusive W and Z boson production is presented. The dataset used corresponds to low pileup LHC runs taken between 2017 and 2018, at both centre-of-mass energies of 5 and 13 TeV. The results show that the resolution is optimal when using the maximal phase space available for the particle clusters in the detector. And an optimization of the...
Ze-Fang Jiang
(Central China Normal University)
12/20/18, 4:30 PM
Heavy Ions
We will present new, exact, finite solutions of relativistic hydrodynamics for
longitudinally expanding fireballs for arbitrary constant value of the speed of
sound (CKCJ). These new solutions generalize earlier, longitudinally finite, exact
solutions, from an unrealistic to a reasonable equation of state, characterized
by a temperature independent (average) value of the speed of...
Asma Hadef
(University of Science and Technology of China)
12/20/18, 4:45 PM
Beyond Standard Model
Several models beyond the standard model (BSM) predict new resonances decaying into two photons. The diphoton final state has the advantage of a clean experimental signature with an excellent mass resolution and moderate background. Using this final state, the CMS Collaboration observed a small excess near 95 GeV with a local (global) significance of 2.8 (1.3) standard deviations when...
Ms
Qun WANG
(Peking University)
12/20/18, 4:45 PM
The measurement of the differential cross section of Z boson production in association with jets (Z+jets) in proton-proton collision at the center-of-mass energy of 13 TeV will be present. The data has been recorded with the CMS detector at the LHC during the year 2015, corresponding to an integrated luminosity of 2.19 fb−1. The goal of analysis is to perform a first measurement at 13 TeV of...
Xiang-Yu Wu
(Central China Normal University)
12/20/18, 5:00 PM
Heavy Ions
We perform a systematic study on the decorrelation of anisotropic flows along the pseudorapidity in relativistic heavy-ion collisions at the LHC and RHIC energies.The dynamical evolution of the QGP fireball is simulated via the CLVisc (3+1)D hydrodynamics model, with the fully fluctuating initial condition from AMPT model.
Detailed analysis is performed on the longitudinal decorrelations of...
Dimitrii Krasnopevtsev
(University of Science and Technology of China)
12/20/18, 5:00 PM
The production of Z bosons in association with a high-energy photon is studied in the neutrino decay channel of the Z boson using pp collisions at √ s = 13 TeV. The analysis uses a data sample with an integrated luminosity of 36.1 fb−1 collected by the ATLAS detector at the LHC in 2015 and 2016. Candidate Zγ events with invisible decays of the Z boson are selected by requiring significant...
Bo Liu
(IHEP)
,
bo liu
(IHEP)
12/20/18, 5:00 PM
Beyond Standard Model
This talk will present a search for heavy resonance decaying to Z/W/H + an energetic photon using 36.1 fb$^{-1}$ pp collision data collected by the ATLAS detector. Only the hadronic decays of Z/W/H bosons are considered. This search explores the phase space where the boson decay products are close and form a fat jet. No obvious deviations are found with respect to the Standard Model...
Mr
Ziming Liu
(Peking University)
12/20/18, 5:15 PM
Heavy Ions
We apply principal component analysis(PCA) to simulated data of relativistic heavy-ion collisions. Unlike traditional Fourier methods, we apply PCA directly to single particle distribution. Interesting patterns are identified by PCA as eigenmodes, from which we define new flow observables $v_n^{'}$ compared to traditional ones $v_n$. The eigenmodes are very much like traditional Fourier bases,...
Ms
liqing zhang
(University of Science and Technology of China)
12/20/18, 5:15 PM
The talk will present an observation of electroweak production of a same-sign W boson pair in association with two jets using 36.1 fb−1 of proton-proton collision data recorded by the ATLAS detector at a center-of-mass energy of 13 TeV. Events containing two same-sign leptons, electron or muon, and at least two jets, are selected.
Mr
Miaoran Lu
(USTC)
12/20/18, 5:15 PM
Beyond Standard Model
A search for a heavy resonance decaying into WZ in the fully leptonic channel (electrons and muons) is performed. It is based on proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 36.1 fb−1
. No significant excess is observed over the Standard Model predictions and...
Elena Yatsenko
(Shanghai Jiao Tong University)
12/20/18, 5:30 PM
At ICHEP2018 conference, ATLAS presented its first observations of same-sign WW and WZ vector boson scattering processes, the latter of which was considered as the 1st observation of such process at LHC, leading to a collaboration wide highlight at the ICHEP2018 conference. It is a very important milestone to probe the SM-EWK symmetry breaking and Higgs unitarization mechanism in the VBS...
Mr
Wenxing Fang
(Beihang University)
12/20/18, 5:30 PM
Beyond Standard Model
A search for new physics in top quark production is performed in proton-proton collisions
at 13 TeV. The data set corresponds to an integrated luminosity of 35.9 fb^-1,
and was collected in 2016 by the CMS detector. Events with two opposite-sign isolated
leptons (electrons or muons) and b quark jets in the final state are selected. The
search is sensitive to new physics in top quark pair...
Wenbin Zhao
(school of physics Peking Uniersity)
12/20/18, 5:30 PM
Heavy Ions
Within the framework of the coalescence model based on the phase-space distributions of protons and neutrons
generated from the {{\tt iEBE-VISHNU}} hybrid model with {{\tt AMPT}} initial conditions, we study the spectra and elliptic flow of deuterons and helium-3 in relativistic heavy ion collisions at the Relativistic Heavy Ion Collider (RHIC) and the Larger Hadron Collider (LHC). Results...
Wanyun Su
(Shanghai Jiao Tong University)
12/20/18, 5:45 PM
Distinguishing quark-initiated from gluon-initiated jets is useful for many measurements and searches at the LHC. Development of tools for distinguishing quark- from gluon-initiated jets are potentially useful. However, there arises difficulty from the topology dependence of quark-versus-gluon jet tagging.The dijet topologies either dijet back to back or djet plus a gamma (quark dominated) or...
Mr
Zhilei SHE
(China University of Geosciences(wuhan))
12/20/18, 5:45 PM
Heavy Ions
The Large Hadron Collider (LHC) at the European Organization for Nuclear Research(CERN) can provide a good experimental condition to study the production of light (anti) nuclei and to understand the underlying physical mechanisms for collision physics.The centrality dependence of light (anti)nuclei and (anti)hypertriton production in Pb-Pb collisions at LHC energy are investigated using the...
Dr
Marc Bret Cano
(Shanghai Jiao Tong university)
12/20/18, 5:45 PM
Beyond Standard Model
A search is performed for a heavy particle decaying into different-flavor,
dilepton pairs ($e\mu$, $e\tau$ or $\mu\tau$), using 36.1$fb^{-1}$
of proton--proton collision data at $\sqrt{s}=13$~TeV collected in
2015--2016 by the ATLAS detector at the Large Hadron Collider. No excesses over
the Standard Model predictions are observed. Bayesian lower limits at the 95\%
credibility level are...
Dr
Junjie Cao
(Henan Normal University)
12/21/18, 8:30 AM
Plenary
Jin Wang
(IHEP)
12/21/18, 10:06 AM
Plenary
This talk presents the most up-to-date results on top physics with LCH experiment.
文斌 钱
(University of Chinese Academy of Sciences)
12/21/18, 11:24 AM
Dr
航 尹
(华中师范大学)
12/21/18, 11:48 AM
Plenary
Prof.
Wei Wang
(Shanghai JiaoTong University)
12/21/18, 12:12 PM
Plenary
Daekyoung Kang
(Fudan University)
12/21/18, 2:00 PM
QCD
We study the transverse energy spectrum for the Drell-Yan process. The transverse energy is measured within the central region defined by a (pseudo-) rapidity cutoff. Soft-collinear effective theory (SCET) is used to factorize the cross section and resum large logarithms of the rapidity cutoff and ratios of widely separated scales that appear in the fixed order result. We develop a framework...
Mr
Zhi Li
(Shandong University)
12/21/18, 2:00 PM
Higgs
Ms
Yuzhen Yang
(高能所)
12/21/18, 2:00 PM
Detector performance and upgrade
The Inner Tracker (ITk) for ATLAS Phase-II Upgrade is proposed for the challenge of High Luminosity LHC (HL-LHC), which requests higher radiation resistant, smaller granularity and faster detector. The inner tracker consists of several layers of silicon detectors. This presentation will focus on the recent process of barrel strip module production performed by the ITk strips community,...
Er-Liang Cui
(Beihang University)
12/21/18, 2:15 PM
QCD
In 2002 the SELEX experiment collaboration reported the evidence of the doubly charmed baryon $\Xi_{cc}^+(3519)$ in the process of $\Xi_{cc}^+ \to \Lambda_c^+ K^- \pi^+$. Recently, the LHCb collaboration discovered a new state $\Xi^{++}_{cc}(3621)$, which is considered to be a new doubly charmed baryon, in the $\Lambda^+_c K^- \pi^+ \pi^+$ mass spectrum. Many theoretical methods and models,...
Prof.
Yongjie Sun
(USTC)
12/21/18, 2:15 PM
Detector performance and upgrade
The ATLAS Muon spectrometer will be significantly upgraded during the Phase-II upgrade in order to cope with the High Luminosity Large Hadron Collider (HL-LHC). Additional RPC detectors will be installed in the inner barrel layer to increase the acceptance and redundancy, especially under the decreased efficiency of the current RPCs which will exceed their designed longevity then. The new RPC...
飞 李
(China University of Geosicence (WuHan))
12/21/18, 2:30 PM
QCD
We consider $R^4$ corrections to the holographic Schwinger effect in
an AdS black hole background and a confining D3-brane background.
The potential between a test particle pair are performed for both backgrounds.
We find there is no potential barrier in the critical electric field,
which means that the system becomes catastrophically unstable.
It is shown that for both backgrounds,...
Prof.
Qing-Hong Cao
(Peking University)
12/21/18, 2:30 PM
Higgs
I will present talk on the potential of measuring the CP property of Top-Higgs interaction through multiple top-quark production at the LHC.
Dr
Yong Liu
(Institute of High Energy Physics)
12/21/18, 2:30 PM
Detector performance and upgrade
This talk will present recent progress on the CMS Phase-2 endocap calorimeter upgrade (HGCAL) project, with a major focus on the activities and plans of the IHEP HGCAL team, including preparations of the IHEP-HGCAL module assembly centre and a test stand for HGC modules.
Andrew Levin
(Peking University)
12/21/18, 2:45 PM
Detector performance and upgrade
The CMS Collaboration is preparing to install triple-GEM detectors for muon measurements. In this talk, I will give an overview of the operation of triple-GEM detectors, an overview of the data acquisition system that the CMS Collaboration has developed for the triple-GEM detectors, and an overview of the sequence of quality control tests that are performed. I will then report in detail on the...
Pengyao Cui
(Central China Normal University)
12/21/18, 2:45 PM
QCD
The $p_{\rm T}$ dependence of the baryon-to-meson yield ratio in hadronic and nuclear collisions is sensitive to the collective expansion of the system, the partonic recombination into hadrons, the jet fragmentation and hadronization.
In the region $2 < p_{\rm T} < 6 $ GeV/$c$, this ratio for inclusive yields is significantly enhanced at high multiplicity in small collision systems, such as...
Prof.
Zhijun Liang
(IHEP)
12/21/18, 2:45 PM
Higgs
This talk will focus the results from searches for the Higgs boson in the bb¯ decay mode in ATLAS experiment, which yields an observed (expected) significance of 5.4 (5.5) standard deviations, thus providing direct observation of the Higgs boson decay into b-quarks. This talk will also highlight the contributions from ATLAS Chinese groups.
Mr
Biao Zhang
(Central China Normal University)
12/21/18, 3:00 PM
Detector performance and upgrade
A Large Ion Collider Experiment(ALICE) will undergo a major upgrade during the next LHC Long Shutdown (LS2) scheduled in 2019-20 that will allow to study in detail the QGP properties exploiting the increased Pb-Pb luminosity expected during Run 3 and Run 4.The replacement of the existing Inner Tracking System (ITS) with a completely new ultra-light high-resolution detector is one of the...
Ms
lili li
(Shanxi University)
12/21/18, 3:00 PM
QCD
Transverse momentum spectra of negative and
positive pions produced at mid-(pseudo)rapidity in inelastic or
non-single-diffractive proton-proton ($pp$) collisions over a
center-of-mass energy, $\sqrt{s}$, range from a few GeV to above
10 TeV are analyzed by the blast-wave model with Boltzmann-Gibbs
(Tsallis) statistics. The model results are well fitting to the
experimental data measured...
Mr
Yanhui Ma
(School of Physics，Shandong University)
12/21/18, 3:00 PM
Higgs
A search for the decay of the Standard Model Higgs boson into a bb pair when produced in association with a W or Z boson is performed with the ATLAS detector. The analyzed data, corresponding to an integrated luminosity of 79.8 fb-1, were collected in proton–proton collisions in Run 2 of the Large Hadron Collider at a centre-of-mass energy of 13 TeV. For a Higgs boson mass of 125 GeV, a clear...
Fengwangdong Zhang
(Peking University)
12/21/18, 3:15 PM
Detector performance and upgrade
A new pixel online monitoring system has been developed to give a fast and intuitive view of the detector performance both offline and online. The source script was written modularly in Python programming language in association with the SQLite and Java languages. It establishes a connection with the CMS detector monitoring database, and extracts and stores detector information into a local...
Ms
Qianying GUO
(北京航空航天大学)
12/21/18, 3:15 PM
Higgs
Standard model (SM) of particle physics successfully explains high-energy experimental data. In 2012, ATLAS and CMS experiments reported the independent observation of a new boson, which is consistent with Higgs boson of SM. Subsequently, study with all Run 1 data shows that the properties of this boson is so far fully compatible with expectations of SM by analyzing various decay channels and...
Zhen LIU
(University of Science and Technology of China)
12/21/18, 3:15 PM
QCD
Charmonia are bound states of charm and anti-charm quarks which provide a unique opportunity to explore properties of the quantum chromodynamics.
The production mechanism of charmonia in elementary collisions is not fully understood yet.
Several models have been proposed to describe the production of $J/\psi$ mesons, each one employing a different treatment of the hadronization process....
Claudia Bertella
(IHEP)
12/21/18, 3:30 PM
Higgs
Higgs boson production cross-sections via the gluon-gluon fusion and vector-boson fusion modes are measured in the H→WW*→eνμν decay channel in the ATLAS experiment at the LHC. The H→WW* decay channel has the second largest branching fraction and allows to measure Higgs boson production cross-section with good precision. The analysis based on the proton-proton collision data produced at the LHC...
Marco Sessa
(University of Science and Technology of China)
12/21/18, 3:30 PM
Detector performance and upgrade
The Level-1 Muon Barrel Trigger is one of the main elements of the event selection of the ATLAS experiment at the Large Hadron Collider. It exploits the Resistive Plate Chambers (RPC) detectors to generate the trigger signal. The RPCs are placed in the barrel region of the ATLAS experiment: they are arranged in three concentric double layers and operate in a strong magnetic toroidal field. RPC...
Ms
Yanchun Ding
(CCNU)
12/21/18, 3:30 PM
QCD
In pp collisions at LHC energies, the production of heavy quarks proceeds dominantly from the hard scattering of two gluons. These quarks then hadronise in either open heavy-flavor hadrons or quarkonia (e.g. J/𝜓, Υ). The study of quarkonium production as a function of the charged-particle multiplicity, therefore, naturally links soft and hard processes that occur in the collision and allows...
Mr
Junquan TAO
(IHEP/CAS)
12/21/18, 3:45 PM
Higgs
Measurements of Higgs boson properties in the $\mathrm{H}\rightarrow\gamma\gamma$ decay channel are presented. The measurements include Higgs's signal strength relative to the standard model prediction, signal strengths associated with the different Higgs boson production mechanisms, couplings to bosons and fermions, effective couplings to photons and gluons, fiducial cross sections and...
Mr
Jike Wang
(EPC)
12/21/18, 3:45 PM
Detector performance and upgrade
Dr
Jun Song
(Jining university)
12/21/18, 3:45 PM
Heavy Ions
We find an important new feature of soft hadron production in pp and pPb collisions at LHC energies, that is, the possible transition of hadronization mechanism from the traditional fragmentation to the quark combination. We observe that the ALICE data for the low p_T (<=6GeV/c) spectra of Omega(sss) and phi(s\bar{s}) in pPb collisions at 5.02 TeV exhibit a constituent quark number scaling...
Dr
Ping Yang
(Central China Normal University)
12/21/18, 4:15 PM
Detector performance and upgrade
The Circular Electron Positron Collider (CEPC) is proposed as a Higgs factory to produce adequate events, which is the basis for high precision measurement of Higgs boson. The vertex detector in CEPC should meet the requirement of low material budget, high spatial resolution, fast readout speed and low power consumption. The MIC4 sensor is a CMOS Monolithic Active Pixel Sensor (MAPS) being...
Prof.
Xiaofei Yan
(IHEP)
12/21/18, 4:15 PM
Detector performance and upgrade
hongge Xu
(China University of Geosciences)
12/21/18, 4:15 PM
Higgs
The space-time structure of the Higgs boson decaying into hadron-jets (Higgs-jets) is carefully studied with the HBT correlation method using e$^+$e$^-$ collision events produced by the Monte Carlo generator PYTHIA 8.219 at $\sqrt{s}=250$ GeV. The measurement of the Higgs boson radius and decay lifetime are derived from the HBT correlation of the final state pions, with an upper bound of $R_H...
Mr
Yi LIU
(IHEP)
12/21/18, 4:30 PM
Detector performance and upgrade
Dr
Van Que Tran
(Nanjing University)
12/21/18, 4:30 PM
Higgs
Pair production of Higgs boson at the Large Hadron Collider (LHC) is known to be important for the determination of Higgs boson self-coupling and the probe of new physics beyond the Standard Model (SM), especially the existence of new fundamental scalar boson. In this paper we study in detail the Higgs pair production at the LHC in a well-motivated model, the Gauged Two Higgs Doublet Model...
Dr
Hongbo LIAO Hongbo
(Institute of High Energy Physics)
12/21/18, 4:30 PM
Detector performance and upgrade
We present the algorithm developed by the CMS Collaboration in order to reconstruct and identify tau leptons decaying hadronically at 13 TeV, using 2016 data. With respect to the previous result, within several improvements, the algorithm is extended to reconstruct tau leptons in highly Lorentz-boosted pair production.
Tong Li
(Nankai University)
12/21/18, 4:45 PM
Beyond Standard Model
Prof.
Yaquan FANG Yaquan
(高能所)
12/21/18, 4:45 PM
Higgs
Vector Boson Fusion (VBF) is the second largest production of the Higgs and its contribution to the discovery of the Higgs is important. After the discovery of Higgs, Searching for Higgs with different production model is one of the most important topics at the LHC. ATLAS observed around 3 sigma with RUN1 data and achieves the first observation (5 sigma) mostly from Higgs decaying into two...
Prof.
Zhen An LIU Zhenan
(IHEP)
12/21/18, 4:45 PM
Detector performance and upgrade
Antonio De Maria
(N)
, Dr
雷 张
(南京大学)
12/21/18, 5:00 PM
Higgs
A measurement of the production cross sections of the Higgs boson in proton–proton collisions is presented in the H → ττ decay channel. The analysis is performed using Run 2 data recorded by the ATLAS experiment during the 2015 and 2016 period at the Large Hadron Collider at a center-of-mass energy of √s= 13 TeV. The H → ττ signal over the expected background processes is established with an...
100.
On the textures of neutrino mass matrix for maximal atmospheric mixing angle and Dirac CP phase
Dr
振华 赵
(辽宁师范大学)
12/21/18, 5:00 PM
Beyond Standard Model
Claudia Bertella
(IHEP)
12/21/18, 5:00 PM
Detector performance and upgrade
The ATLAS silicon tracker detectors are designed to sustain high dose integrated over several years of operation. This very substantial radiation hardness should also favour the survival of the detector in case of accidental beam losses. An experiment performed in 2006 showed that ATLAS pixel detector modules (silicon planar hybridly coupled with FE-I3 electronics) could survive to beam losses...
Mr
Zirui Wang
(Shanghai Jiao Tong University)
12/21/18, 5:15 PM
Higgs
Mr
Yuyue Gan
(Tsinghua University)
12/21/18, 5:15 PM
Detector performance and upgrade
There will be 524,000 channels of SiPM to be readout in the LHCb SciFi tracker, with the 64-ch PACIFIC ASIC. The frontend electronics should have 4 ASICs on each board, with SLVS differential outputs of 256-ch readout signals from the SiPMs of the SciFi. The frontend board (Carrier Board) was designed and evaluated its performance with test beam in 2018 by Tsinghua group. The board was...
Ying-nan Mao
(NCTS(Hsinchu))
12/21/18, 5:15 PM
Beyond Standard Model
Based on the canonically-normalization procedure, we completely derived the interactions in the simplest little Higgs model, and corrected a lot of mistakes in previous papers by others, hence the phenomenology must be fully re-considered. We updated the experimental constraints and collider phenomenology of this model, especially about the pseudoscalar $\eta$, in the narutal region. We...
Mr
hanlin Xu
(University of Science and Technology of China)
12/21/18, 5:30 PM
Higgs
A search for doubly charged scalar bosons decaying into W boson pairs is presented. It uses a
data sample from proton–proton collisions corresponding to an integrated luminosity of 36.1 fb−1
collected by the ATLAS detector at the LHC at a centre-of-mass energy of 13 TeV in 2015 and
2016. This search is guided by a model that includes an extension of the Higgs sector through
a scalar...
Prof.
Ning Chen
(Nankai University)
12/21/18, 5:30 PM
Higgs
In this talk, we will discuss the new theoretical constraints, such as the global minimum requirment to the BSM Higgs potential, and the corresponding phenomenology at the LHC searches for the new heavy Higgs boson. With the one-loop BSM correction to the Higgs couplings taken into account, we show that the future electron-positron colliders, such as CEPC, can be complementary to the direct...
Mr
Li Xu
(Tsinghua University)
12/21/18, 5:30 PM
Detector performance and upgrade
The LHCb Upgrade will replace the electronics of all subdetectors to cope with a hardware triggerless readout at 40 MHz. For the tracker system, the current T1-T3 stations will be fully replaced by the SciFi tracker system based on the scintillating fibre technology. The front-end read-out boards, which are connected to the SiPMs, are co-designed by the Tsinghua and Heidelberg groups. A...
Prof.
Pengfei Zhuang
(Tsinghua University)
12/22/18, 8:30 AM
xiaohui liu
(beijing normal university)
12/22/18, 9:42 AM
Plenary
In this talk, I will review the current status of the QCD physics at the LHC, ranging from the precision phenomenologies to the more recent developments in jet substructures. Available theory frameworks for achieving the first principle understanding of the related processes will also be reviewed. Connections to the other aspects of the LHC physics, e.g. LHC new physics searches, may also be discussed.
Prof.
Yaping Wang
(Central China Normal University)
12/22/18, 12:00 PM
