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R Aoyama - One of the best experts on this subject based on the ideXlab platform.
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Polarization of Λ (Λ[over ¯]) Hyperons along the Beam Direction in Au+Au Collisions at sqrt[s_{NN}]=200 GeV.
Physical review letters, 2019Co-Authors: J Adam, L Adamczyk, J R Adams, J K Adkins, G Agakishiev, M M Aggarwal, Z Ahammed, I Alekseev, Derek Anderson, R AoyamaAbstract:The Λ (Λ[over ¯]) hyperon polarization along the Beam Direction has been measured in Au+Au collisions at sqrt[s_{NN}]=200 GeV, for the first time in heavy-ion collisions. The polarization dependence on the hyperons' emission angle relative to the elliptic flow plane exhibits a second harmonic sine modulation, indicating a quadrupole pattern of the vorticity component along the Beam Direction, expected due to elliptic flow. The polarization is found to increase in more peripheral collisions, and shows no strong transverse momentum (p_{T}) dependence at p_{T} greater than 1 GeV/c. The magnitude of the signal is about 5 times smaller than those predicted by hydrodynamic and multiphase transport models; the observed phase of the emission angle dependence is also opposite to these model predictions. In contrast, the kinematic vorticity calculations in the blast-wave model tuned to reproduce particle spectra, elliptic flow, and the azimuthal dependence of the Gaussian source radii measured with the Hanbury Brown-Twiss intensity interferometry technique reproduce well the modulation phase measured in the data and capture the centrality and transverse momentum dependence of the polarization signal.
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polarization of λ λ over hyperons along the Beam Direction in au au collisions at sqrt s_ nn 200 gev
Physical Review Letters, 2019Co-Authors: J Adam, L Adamczyk, J R Adams, J K Adkins, G Agakishiev, M M Aggarwal, Z Ahammed, I Alekseev, D M Anderson, R AoyamaAbstract:The Λ (Λ[over ¯]) hyperon polarization along the Beam Direction has been measured in Au+Au collisions at sqrt[s_{NN}]=200 GeV, for the first time in heavy-ion collisions. The polarization dependence on the hyperons' emission angle relative to the elliptic flow plane exhibits a second harmonic sine modulation, indicating a quadrupole pattern of the vorticity component along the Beam Direction, expected due to elliptic flow. The polarization is found to increase in more peripheral collisions, and shows no strong transverse momentum (p_{T}) dependence at p_{T} greater than 1 GeV/c. The magnitude of the signal is about 5 times smaller than those predicted by hydrodynamic and multiphase transport models; the observed phase of the emission angle dependence is also opposite to these model predictions. In contrast, the kinematic vorticity calculations in the blast-wave model tuned to reproduce particle spectra, elliptic flow, and the azimuthal dependence of the Gaussian source radii measured with the Hanbury Brown-Twiss intensity interferometry technique reproduce well the modulation phase measured in the data and capture the centrality and transverse momentum dependence of the polarization signal.
J Adam - One of the best experts on this subject based on the ideXlab platform.
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Polarization of Λ (Λ[over ¯]) Hyperons along the Beam Direction in Au+Au Collisions at sqrt[s_{NN}]=200 GeV.
Physical review letters, 2019Co-Authors: J Adam, L Adamczyk, J R Adams, J K Adkins, G Agakishiev, M M Aggarwal, Z Ahammed, I Alekseev, Derek Anderson, R AoyamaAbstract:The Λ (Λ[over ¯]) hyperon polarization along the Beam Direction has been measured in Au+Au collisions at sqrt[s_{NN}]=200 GeV, for the first time in heavy-ion collisions. The polarization dependence on the hyperons' emission angle relative to the elliptic flow plane exhibits a second harmonic sine modulation, indicating a quadrupole pattern of the vorticity component along the Beam Direction, expected due to elliptic flow. The polarization is found to increase in more peripheral collisions, and shows no strong transverse momentum (p_{T}) dependence at p_{T} greater than 1 GeV/c. The magnitude of the signal is about 5 times smaller than those predicted by hydrodynamic and multiphase transport models; the observed phase of the emission angle dependence is also opposite to these model predictions. In contrast, the kinematic vorticity calculations in the blast-wave model tuned to reproduce particle spectra, elliptic flow, and the azimuthal dependence of the Gaussian source radii measured with the Hanbury Brown-Twiss intensity interferometry technique reproduce well the modulation phase measured in the data and capture the centrality and transverse momentum dependence of the polarization signal.
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polarization of λ λ over hyperons along the Beam Direction in au au collisions at sqrt s_ nn 200 gev
Physical Review Letters, 2019Co-Authors: J Adam, L Adamczyk, J R Adams, J K Adkins, G Agakishiev, M M Aggarwal, Z Ahammed, I Alekseev, D M Anderson, R AoyamaAbstract:The Λ (Λ[over ¯]) hyperon polarization along the Beam Direction has been measured in Au+Au collisions at sqrt[s_{NN}]=200 GeV, for the first time in heavy-ion collisions. The polarization dependence on the hyperons' emission angle relative to the elliptic flow plane exhibits a second harmonic sine modulation, indicating a quadrupole pattern of the vorticity component along the Beam Direction, expected due to elliptic flow. The polarization is found to increase in more peripheral collisions, and shows no strong transverse momentum (p_{T}) dependence at p_{T} greater than 1 GeV/c. The magnitude of the signal is about 5 times smaller than those predicted by hydrodynamic and multiphase transport models; the observed phase of the emission angle dependence is also opposite to these model predictions. In contrast, the kinematic vorticity calculations in the blast-wave model tuned to reproduce particle spectra, elliptic flow, and the azimuthal dependence of the Gaussian source radii measured with the Hanbury Brown-Twiss intensity interferometry technique reproduce well the modulation phase measured in the data and capture the centrality and transverse momentum dependence of the polarization signal.
Sungjoon Lim - One of the best experts on this subject based on the ideXlab platform.
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Bioinspired DNA Origami Quasi-Yagi Helical Antenna with Beam Direction and Beamwidth Switching Capability
Scientific Reports, 2019Co-Authors: Syed Imran Hussain Shah, Sungjoon LimAbstract:We propose a bioinspired origami quasi-Yagi helical antenna with Beam Direction and Beamwidth switching capability based on transformable DNA origami structure. Each DNA molecule consists of a double helical chain, and its length can be transformed by folding and unfolding. When three transformable origami DNA structures are applied to the quasi-Yagi helical antenna, Beam Direction and Beamwidth can be controlled by folding and unfolding the origami DNA. The transformable DNA structures act as driven, director and reflector elements. The proposed DNA origami antenna provides four Beam Direction switching states (three states with narrow Beamwidth and one state with wide Beamwidth) at fixed frequency of 1.9 GHz. For example, the main Beam Direction of the proposed antenna can be steered to −30°, 0°, +30° and −40° for states 1, 2, 3 and 4, respectively. State 4 provides a 3-dB wider Beamwidth of 104°, whereas the Beamwidth of other states is narrower than 64°. The proposed concept is numerically and experimentally demonstrated.
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Bioinspired DNA Origami Quasi-Yagi Helical Antenna with Beam Direction and Beamwidth Switching Capability
Scientific Reports, 2019Co-Authors: Syed Imran Hussain Shah, Sungjoon LimAbstract:We propose a bioinspired origami quasi-Yagi helical antenna with Beam Direction and Beamwidth switching capability based on transformable DNA origami structure. Each DNA molecule consists of a double helical chain, and its length can be transformed by folding and unfolding. When three transformable origami DNA structures are applied to the quasi-Yagi helical antenna, Beam Direction and Beamwidth can be controlled by folding and unfolding the origami DNA. The transformable DNA structures act as driven, director and reflector elements. The proposed DNA origami antenna provides four Beam Direction switching states (three states with narrow Beamwidth and one state with wide Beamwidth) at fixed frequency of 1.9 GHz. For example, the main Beam Direction of the proposed antenna can be steered to −30°, 0°, +30° and −40° for states 1, 2, 3 and 4, respectively. State 4 provides a 3-dB wider Beamwidth of 104°, whereas the Beamwidth of other states is narrower than 64°. The proposed concept is numerically and experimentally demonstrated.
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A Novel Bio-Inspired Quasi-Yagi Helical Antenna with Beam Direction and Beamwidth Switching Capability using Origami DNA
2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, 2019Co-Authors: Syed Imran Hussain Shah, Sungjoon LimAbstract:In this paper, a bio-inspired origami quasi-Yagi helical antenna having Beam Direction and Beamwidth switching capability is presented. The structure of the antenna is based on the transformable origami DNA which is inspired from DNA of living cell. The length of a living cell DNA is few microns in the folded state and can be transformed to 2 m by unfolding. In this study, three origami DNA geometries named as DNA #1, DNA #2 and DNA #3, are applied to design quasi-Yagi helical antenna. DNA #2 serves as a driven element and DNA #1 and DNA #3 serve as parasitic elements. The Beam Direction and Beamwidth of the antenna can be controlled by folding and unfolding the parasitic elements. The presented antenna provides four Beam steering states having first three states with narrow Beamwidth and fourth state with wide Beamwidth at the fixed resonant frequency of 1.9 GHz. For example, the Beam Direction of the antenna for the states 1, 2, 3, and 4 can be steered to −30°, 0°, +30°, and −40° respectively. The presented antenna provides wider 3 dB Beamwidth of 104° in the fourth state, while Beamwidth of the first three states are narrower than 64°.
L Adamczyk - One of the best experts on this subject based on the ideXlab platform.
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Polarization of Λ (Λ[over ¯]) Hyperons along the Beam Direction in Au+Au Collisions at sqrt[s_{NN}]=200 GeV.
Physical review letters, 2019Co-Authors: J Adam, L Adamczyk, J R Adams, J K Adkins, G Agakishiev, M M Aggarwal, Z Ahammed, I Alekseev, Derek Anderson, R AoyamaAbstract:The Λ (Λ[over ¯]) hyperon polarization along the Beam Direction has been measured in Au+Au collisions at sqrt[s_{NN}]=200 GeV, for the first time in heavy-ion collisions. The polarization dependence on the hyperons' emission angle relative to the elliptic flow plane exhibits a second harmonic sine modulation, indicating a quadrupole pattern of the vorticity component along the Beam Direction, expected due to elliptic flow. The polarization is found to increase in more peripheral collisions, and shows no strong transverse momentum (p_{T}) dependence at p_{T} greater than 1 GeV/c. The magnitude of the signal is about 5 times smaller than those predicted by hydrodynamic and multiphase transport models; the observed phase of the emission angle dependence is also opposite to these model predictions. In contrast, the kinematic vorticity calculations in the blast-wave model tuned to reproduce particle spectra, elliptic flow, and the azimuthal dependence of the Gaussian source radii measured with the Hanbury Brown-Twiss intensity interferometry technique reproduce well the modulation phase measured in the data and capture the centrality and transverse momentum dependence of the polarization signal.
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polarization of λ λ over hyperons along the Beam Direction in au au collisions at sqrt s_ nn 200 gev
Physical Review Letters, 2019Co-Authors: J Adam, L Adamczyk, J R Adams, J K Adkins, G Agakishiev, M M Aggarwal, Z Ahammed, I Alekseev, D M Anderson, R AoyamaAbstract:The Λ (Λ[over ¯]) hyperon polarization along the Beam Direction has been measured in Au+Au collisions at sqrt[s_{NN}]=200 GeV, for the first time in heavy-ion collisions. The polarization dependence on the hyperons' emission angle relative to the elliptic flow plane exhibits a second harmonic sine modulation, indicating a quadrupole pattern of the vorticity component along the Beam Direction, expected due to elliptic flow. The polarization is found to increase in more peripheral collisions, and shows no strong transverse momentum (p_{T}) dependence at p_{T} greater than 1 GeV/c. The magnitude of the signal is about 5 times smaller than those predicted by hydrodynamic and multiphase transport models; the observed phase of the emission angle dependence is also opposite to these model predictions. In contrast, the kinematic vorticity calculations in the blast-wave model tuned to reproduce particle spectra, elliptic flow, and the azimuthal dependence of the Gaussian source radii measured with the Hanbury Brown-Twiss intensity interferometry technique reproduce well the modulation phase measured in the data and capture the centrality and transverse momentum dependence of the polarization signal.
J R Adams - One of the best experts on this subject based on the ideXlab platform.
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Polarization of Λ (Λ[over ¯]) Hyperons along the Beam Direction in Au+Au Collisions at sqrt[s_{NN}]=200 GeV.
Physical review letters, 2019Co-Authors: J Adam, L Adamczyk, J R Adams, J K Adkins, G Agakishiev, M M Aggarwal, Z Ahammed, I Alekseev, Derek Anderson, R AoyamaAbstract:The Λ (Λ[over ¯]) hyperon polarization along the Beam Direction has been measured in Au+Au collisions at sqrt[s_{NN}]=200 GeV, for the first time in heavy-ion collisions. The polarization dependence on the hyperons' emission angle relative to the elliptic flow plane exhibits a second harmonic sine modulation, indicating a quadrupole pattern of the vorticity component along the Beam Direction, expected due to elliptic flow. The polarization is found to increase in more peripheral collisions, and shows no strong transverse momentum (p_{T}) dependence at p_{T} greater than 1 GeV/c. The magnitude of the signal is about 5 times smaller than those predicted by hydrodynamic and multiphase transport models; the observed phase of the emission angle dependence is also opposite to these model predictions. In contrast, the kinematic vorticity calculations in the blast-wave model tuned to reproduce particle spectra, elliptic flow, and the azimuthal dependence of the Gaussian source radii measured with the Hanbury Brown-Twiss intensity interferometry technique reproduce well the modulation phase measured in the data and capture the centrality and transverse momentum dependence of the polarization signal.
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polarization of λ λ over hyperons along the Beam Direction in au au collisions at sqrt s_ nn 200 gev
Physical Review Letters, 2019Co-Authors: J Adam, L Adamczyk, J R Adams, J K Adkins, G Agakishiev, M M Aggarwal, Z Ahammed, I Alekseev, D M Anderson, R AoyamaAbstract:The Λ (Λ[over ¯]) hyperon polarization along the Beam Direction has been measured in Au+Au collisions at sqrt[s_{NN}]=200 GeV, for the first time in heavy-ion collisions. The polarization dependence on the hyperons' emission angle relative to the elliptic flow plane exhibits a second harmonic sine modulation, indicating a quadrupole pattern of the vorticity component along the Beam Direction, expected due to elliptic flow. The polarization is found to increase in more peripheral collisions, and shows no strong transverse momentum (p_{T}) dependence at p_{T} greater than 1 GeV/c. The magnitude of the signal is about 5 times smaller than those predicted by hydrodynamic and multiphase transport models; the observed phase of the emission angle dependence is also opposite to these model predictions. In contrast, the kinematic vorticity calculations in the blast-wave model tuned to reproduce particle spectra, elliptic flow, and the azimuthal dependence of the Gaussian source radii measured with the Hanbury Brown-Twiss intensity interferometry technique reproduce well the modulation phase measured in the data and capture the centrality and transverse momentum dependence of the polarization signal.