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Start:
[[ATLAS]]&br;
[[ExperimentalParticlePhysics]]
*Introduction [#zf885521]
#ref(http://epp.phys.kyushu-u.ac.jp/image/atlas9.png,right,around,zoom,320x211);
SIZE(15){ Have you ever heard about the CERN, the LHC, the ATLAS experiment or the Higgs particle?}
&br; SIZE(15){ On this page, you will find a brief explanation of those keywords as well as a presentation of our research activities in Kyushu University.}
#clear
*ATLAS Experiment Group [#zf885521]
#ref(http://epp.phys.kyushu-u.ac.jp/image/atlas3.jpg,right,around,zoom,320x211);
SIZE(15){ The ATLAS experiment is one of the international collaboration projects that occur at the European research center for nuclear and particle physics (Centre Européen de Recherche Nucléaire : CERN) situated at Geneva, Switzerland. Four large experiments, including ATLAS, use a particle accelerator called the Large Hadron Collider (LHC). With its 27km of circumference, the LHC is the world's biggest circular accelerator. Protons are accelerated by the LHC and collided at the center of the ATLAS detector. The particles produced in the collisions are observed by the ATLAS detector to test the standard model of particle physics and to search for new phenomena beyond the standard model.}
#clear
#ref(http://epp.phys.kyushu-u.ac.jp/image/atlas7.jpg,right,around,zoom,320x211);
SIZE(15){ A schematic picture of the ATLAS detector is shown on the right. Even with its giant dimensions of 25m high, 44m wide and its weight of 7000t, the detector is able to perform extremely high precision measurements. This detector is made, from the inner part to the edge, by the Inner Tracker, the Electromagnetic Calorimeter, the Hadron Calorimeter and the Muon Detector. By using the information of each sub-detector, it is possible to measure the energy and momentum of the particles and to identify them.}
#clear
#ref(http://epp.phys.kyushu-u.ac.jp/image/atlas2.jpg,right,around,zoom,320x211);
SIZE(15){ In June 2015, after two years of detector upgrade, maintenance and preparation, the collisions restarted with the world's highest energy of 13 TeV. All the world is looking for the next results from the ATLAS experiment.}
#clear
&br;
&br; &size(15){ The staff members and students in our group are mainly working on four research topics.};
*Detector Operation [#zf885521]
#ref(http://epp.phys.kyushu-u.ac.jp/image/atlas6.jpg,right,around,zoom,320x211);
SIZE(15){ The Semi-Conductor Tracker (SCT), a micro-strip detector, is one of the important components of the ATLAS Inner Tracker, that detects tracks of the charged particles produced in proton-proton collisions, and measures their momenta. One of our activities is to operate, improve and calibrate this sub-detector. Staff members and graduate students staying at CERN contribute to the detector operations.}
#clear
&br;
*Data Preparation [#zf885521]
SIZE(15){ Various information of the ATLAS detector is managed in a database. We prepare the database for the data acquisition and the data processing. The information includes the detector position, cable connection, calibration, noise level, magnetic field, and so on, and is used for many purposes.}
*Physics Analysis [#zf885521]
&size(15){ Using the experimental data collected by the ATLAS detector, we are mainly working on two main physics topics.};
&br;&size(15){ One is the study of the Higgs Boson, the other is search for Supersymmetry.};
&br;
&br;&size(20){◯Study of the Higgs Boson};
#ref(http://epp.phys.kyushu-u.ac.jp/image/atlas1.jpg,right,around);
SIZE(15){ The Standard Model (SM) of Particle Physics explains with a high precision all the phenomenons observed fro far. Among all particles predicted by the SM, only the Higgs particle remained unobserved. Nevertheless in 2012, the ATLAS and CMS experiments announced the discovery of a new particle, that were identified as the Higgs boson. This discovery awarded Peter W. Higgs and François Englert with the 2013 Nobel prize in physics. Our study focuses on processes of a Higgs boson decaying into a pair of Z particles, particularly by contributing to the evaluation of the systematic uncertainties.}
&br;
&br;SIZE(15){ The top-right figure represents an event display of a Higgs particle that decays to a pair of Z, which themselves decay to two pairs of muons. We can see four muons drawn in red on the figure.}
#clear
#ref(http://epp.phys.kyushu-u.ac.jp/image/atlas5.jpg,right,around,zoom,300x253);
&br;SIZE(15){ In the histogram on the right, it is possible to see a peak around 125 GeV, consistent with the prediction of the Higgs boson signal (red), sitting on the backgrounds (blue and purple). }
&br;SIZE(15){ After the discovery of the Higgs boson, we are working on precise measurements of its properties and making indirect search for new physics by the measurements.}
#clear
&br;&size(20){◯Search for Supersymmetry};
#ref(http://epp.phys.kyushu-u.ac.jp/image/atlas10.png,right,around,zoom,320x211);
SIZE(15){Search for Supersymmetry (SUSY) is one of the most important topics in particle physics. The Higgs boson was discovered and its mass was measured to be 125 GeV but still, this value is unnaturally small from a theoretical point of view. Although Furthermore, in the fundamental interactions (Gravity, Electromagnetism, Strong and Weak forces), only the Electromagnetic and Weak interactions were unified to the Electroweak force in the Standard Model, a new mechanism must be introduced to unify the Strong force with others. Many other mysteries remain in particle physics and new physics Beyond the Standard Model (BSM) must exist. The SUSY (Supersymmetry) theory is an attractive candidate to explain some of the mysteries, including the Dark matter in the universe. In this theory, a partner is introduced for every particle of the Standard Model that is called SUSY particle. }
&br; SIZE(15){Our group is In particular interested in search for longed-lived SUSY particles. The figure on the right is a Feynman diagram, where production and decay processes of SUSY particles are shown. The red line represent SUSY particles, and a SUSY particle called "Wino" may be long-lived.}
#clear
*Detector Upgrade[#zf885521]
#ref(http://epp.phys.kyushu-u.ac.jp/image/atlas4.jpg,right,around,zoom,320x211);
SIZE(15){ The ATLAS experiment will undertake upgrade phases. Our group focuses on the upgrade of the inner trackers that will occur around 2024, and and is developing a new silicon semiconductor detector. Our laboratory provides equipment to inspect the readout chips and develop the modules for the detector. }
#clear
*Links [#zf885521]
&br;SIZE(15){[[CERN HP:http://home.web.cern.ch//]]}
&br;SIZE(15){[[ATLAS Experiment HP:http://atlas.ch/]]}
&br;SIZE(15){[[ATLAS Japan Group HP (Japanese):http://atlas.kek.jp/]]}
End:
[[ATLAS]]&br;
[[ExperimentalParticlePhysics]]
*Introduction [#zf885521]
#ref(http://epp.phys.kyushu-u.ac.jp/image/atlas9.png,right,around,zoom,320x211);
SIZE(15){ Have you ever heard about the CERN, the LHC, the ATLAS experiment or the Higgs particle?}
&br; SIZE(15){ On this page, you will find a brief explanation of those keywords as well as a presentation of our research activities in Kyushu University.}
#clear
*ATLAS Experiment Group [#zf885521]
#ref(http://epp.phys.kyushu-u.ac.jp/image/atlas3.jpg,right,around,zoom,320x211);
SIZE(15){ The ATLAS experiment is one of the international collaboration projects that occur at the European research center for nuclear and particle physics (Centre Européen de Recherche Nucléaire : CERN) situated at Geneva, Switzerland. Four large experiments, including ATLAS, use a particle accelerator called the Large Hadron Collider (LHC). With its 27km of circumference, the LHC is the world's biggest circular accelerator. Protons are accelerated by the LHC and collided at the center of the ATLAS detector. The particles produced in the collisions are observed by the ATLAS detector to test the standard model of particle physics and to search for new phenomena beyond the standard model.}
#clear
#ref(http://epp.phys.kyushu-u.ac.jp/image/atlas7.jpg,right,around,zoom,320x211);
SIZE(15){ A schematic picture of the ATLAS detector is shown on the right. Even with its giant dimensions of 25m high, 44m wide and its weight of 7000t, the detector is able to perform extremely high precision measurements. This detector is made, from the inner part to the edge, by the Inner Tracker, the Electromagnetic Calorimeter, the Hadron Calorimeter and the Muon Detector. By using the information of each sub-detector, it is possible to measure the energy and momentum of the particles and to identify them.}
#clear
#ref(http://epp.phys.kyushu-u.ac.jp/image/atlas2.jpg,right,around,zoom,320x211);
SIZE(15){ In June 2015, after two years of detector upgrade, maintenance and preparation, the collisions restarted with the world's highest energy of 13 TeV. All the world is looking for the next results from the ATLAS experiment.}
#clear
&br;
&br; &size(15){ The staff members and students in our group are mainly working on four research topics.};
*Detector Operation [#zf885521]
#ref(http://epp.phys.kyushu-u.ac.jp/image/atlas6.jpg,right,around,zoom,320x211);
SIZE(15){ The Semi-Conductor Tracker (SCT), a micro-strip detector, is one of the important components of the ATLAS Inner Tracker, that detects tracks of the charged particles produced in proton-proton collisions, and measures their momenta. One of our activities is to operate, improve and calibrate this sub-detector. Staff members and graduate students staying at CERN contribute to the detector operations.}
#clear
&br;
*Data Preparation [#zf885521]
SIZE(15){ Various information of the ATLAS detector is managed in a database. We prepare the database for the data acquisition and the data processing. The information includes the detector position, cable connection, calibration, noise level, magnetic field, and so on, and is used for many purposes.}
*Physics Analysis [#zf885521]
&size(15){ Using the experimental data collected by the ATLAS detector, we are mainly working on two main physics topics.};
&br;&size(15){ One is the study of the Higgs Boson, the other is search for Supersymmetry.};
&br;
&br;&size(20){◯Study of the Higgs Boson};
#ref(http://epp.phys.kyushu-u.ac.jp/image/atlas1.jpg,right,around);
SIZE(15){ The Standard Model (SM) of Particle Physics explains with a high precision all the phenomenons observed fro far. Among all particles predicted by the SM, only the Higgs particle remained unobserved. Nevertheless in 2012, the ATLAS and CMS experiments announced the discovery of a new particle, that were identified as the Higgs boson. This discovery awarded Peter W. Higgs and François Englert with the 2013 Nobel prize in physics. Our study focuses on processes of a Higgs boson decaying into a pair of Z particles, particularly by contributing to the evaluation of the systematic uncertainties.}
&br;
&br;SIZE(15){ The top-right figure represents an event display of a Higgs particle that decays to a pair of Z, which themselves decay to two pairs of muons. We can see four muons drawn in red on the figure.}
#clear
#ref(http://epp.phys.kyushu-u.ac.jp/image/atlas5.jpg,right,around,zoom,300x253);
&br;SIZE(15){ In the histogram on the right, it is possible to see a peak around 125 GeV, consistent with the prediction of the Higgs boson signal (red), sitting on the backgrounds (blue and purple). }
&br;SIZE(15){ After the discovery of the Higgs boson, we are working on precise measurements of its properties and making indirect search for new physics by the measurements.}
#clear
&br;&size(20){◯Search for Supersymmetry};
#ref(http://epp.phys.kyushu-u.ac.jp/image/atlas10.png,right,around,zoom,320x211);
SIZE(15){Search for Supersymmetry (SUSY) is one of the most important topics in particle physics. The Higgs boson was discovered and its mass was measured to be 125 GeV but still, this value is unnaturally small from a theoretical point of view. Although Furthermore, in the fundamental interactions (Gravity, Electromagnetism, Strong and Weak forces), only the Electromagnetic and Weak interactions were unified to the Electroweak force in the Standard Model, a new mechanism must be introduced to unify the Strong force with others. Many other mysteries remain in particle physics and new physics Beyond the Standard Model (BSM) must exist. The SUSY (Supersymmetry) theory is an attractive candidate to explain some of the mysteries, including the Dark matter in the universe. In this theory, a partner is introduced for every particle of the Standard Model that is called SUSY particle. }
&br; SIZE(15){Our group is In particular interested in search for longed-lived SUSY particles. The figure on the right is a Feynman diagram, where production and decay processes of SUSY particles are shown. The red line represent SUSY particles, and a SUSY particle called "Wino" may be long-lived.}
#clear
*Detector Upgrade[#zf885521]
#ref(http://epp.phys.kyushu-u.ac.jp/image/atlas4.jpg,right,around,zoom,320x211);
SIZE(15){ The ATLAS experiment will undertake upgrade phases. Our group focuses on the upgrade of the inner trackers that will occur around 2024, and and is developing a new silicon semiconductor detector. Our laboratory provides equipment to inspect the readout chips and develop the modules for the detector. }
#clear
*Links [#zf885521]
&br;SIZE(15){[[CERN HP:http://home.web.cern.ch//]]}
&br;SIZE(15){[[ATLAS Experiment HP:http://atlas.ch/]]}
&br;SIZE(15){[[ATLAS Japan Group HP (Japanese):http://atlas.kek.jp/]]}
Page: