The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform
D. Drechsel - One of the best experts on this subject based on the ideXlab platform.
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Unitary model for theγp→γπ0preaction and the Magnetic Dipole Moment of theΔ+(1232)
Physical Review C, 2005Co-Authors: Wentai Chiang, M. Vanderhaeghen, Shin Nan Yang, D. DrechselAbstract:Radiative pion photoproduction in the {Delta}(1232) resonance region is studied with the aim to access the {Delta}{sup +}(1232) Magnetic Dipole Moment. We present a unitary model of the {gamma}p {yields} {gamma}{pi}N ({pi}N) = ({pi}{sup 0}p, {pi}{sup +}n) reactions, where the {pi}N rescattering is included in an on-shell approximation. In this model, the low energy theorem which couples the {gamma}p {yields} {gamma}{pi}N process in the limit of a soft final photon to the {gamma}p {yields} {pi}N process is exactly satisfied. We study the sensitivity of the {gamma}p {yields} {gamma}{pi}{sup 0}p process at higher values of the final photon energy to the {Delta}{sup +}(1232) Magnetic Dipole Moment. We compare our results with existing data and give predictions for forthcoming measurements of angular and energy distributions. It is found that the photon asymmetry and a helicity cross section are particularly sensitive to the {Delta}{sup +} Magnetic Dipole Moment.
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Magnetic Dipole Moment of the s11 1535 from the γp γηp reaction
Nuclear Physics, 2003Co-Authors: Wentai Chiang, M. Vanderhaeghen, Shin Nan Yang, D. DrechselAbstract:Abstract The γp → γηp reaction in the S 11 (1535) resonance region is investigated as a method to access the S 11 (1535) Magnetic Dipole Moment. To study the feasibility, we perform calculations of the γp → γηp process within an effective Lagrangian approach containing both the S 11 resonant mechanism and a background of non-resonant contributions. Predictions are made for the forthcoming experiments. In particular, we focus on the sensitivity of cross sections and photon asymmetries to the S 11 (1535) Magnetic Dipole Moment.
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Magnetic Dipole Moment of the S11(1535) from the γp→γηp reaction
Nuclear Physics, 2003Co-Authors: Wentai Chiang, M. Vanderhaeghen, Shin Nan Yang, D. DrechselAbstract:Abstract The γp → γηp reaction in the S 11 (1535) resonance region is investigated as a method to access the S 11 (1535) Magnetic Dipole Moment. To study the feasibility, we perform calculations of the γp → γηp process within an effective Lagrangian approach containing both the S 11 resonant mechanism and a background of non-resonant contributions. Predictions are made for the forthcoming experiments. In particular, we focus on the sensitivity of cross sections and photon asymmetries to the S 11 (1535) Magnetic Dipole Moment.
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Magnetic Dipole Moment of the s11 1535 from the gamma p to gamma eta p reaction
arXiv: Nuclear Theory, 2002Co-Authors: Wentai Chiang, M. Vanderhaeghen, Shin Nan Yang, D. DrechselAbstract:The \gamma p \to \gamma \eta p reaction in the S11(1535) resonance region is investigated as a method to access the S11(1535) Magnetic Dipole Moment. To study the feasibility, we perform calculations of the \gamma p \to \gamma \eta p process within an effective Lagrangian approach containing both the S11 resonant mechanism and a background of non-resonant contributions. Predictions are made for the forthcoming experiments. In particular, we focus on the sensitivity of cross sections and photon asymmetries to the S11(1535) Magnetic Dipole Moment.
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Magnetic Dipole Moment of theΔ+(1232)from theγp→γπ0preaction
Physical Review C, 2001Co-Authors: D. Drechsel, M. VanderhaeghenAbstract:The $\gamma p \to \gamma \pi^0 p$ reaction in the $\Delta(1232)$-resonance region is investigated as a method to access the $\Delta^+(1232)$ Magnetic Dipole Moment. The calculations are performed within the context of an effective Lagrangian model containing both the $\Delta$-resonant mechanism and a background of non-resonant contributions to the $\gamma p \to \gamma \pi^0 p$ reaction. Results are shown both for existing and forthcoming $\gamma p \to \gamma \pi^0 p$ experiments. In particular, the sensitivity of unpolarized cross sections and photon asymmetries to the $\Delta^+$ Magnetic Dipole Moment is displayed for those forthcoming data.
G. Toledo Sánchez - One of the best experts on this subject based on the ideXlab platform.
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Determining the Magnetic Dipole Moment of the rho meson
Journal of Physics: Conference Series, 2015Co-Authors: G. Toledo Sánchez, D. García GudiñoAbstract:We elaborate on the procedure followed to determine the Magnetic Dipole Moment of the rho meson, μp = 2.1 ± 0.5[e/2mρ], from the e+e- → π+π-2π0 process. Using preliminary data from the BaBar Collaboration and a vector meson dominance approach.
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Determination of the Magnetic Dipole Moment of the rho meson
arXiv: High Energy Physics - Phenomenology, 2013Co-Authors: D. García Gudiño, G. Toledo SánchezAbstract:We determine the Magnetic Dipole Moment of the rho meson using preliminary data from the BaBar Collaboration for the e^+ e^- \to \pi^+ \pi^- 2 \pi^0 process, in the center of mass energy range from 0.9 to 2.2 GeV. We describe the \gamma^* \to 4\pi vertex using a vector meson dominance model, including all intermediate resonance contributions. We find that {\mu}_\rho = 2.1 \pm 0.5 \: [e/2 m_\rho]. In addition, we obtain the branching ratio BR(\rho^0 \to \pi^+ \pi^- 2 \pi^0) = 1.7 \pm 0.6 \times 10^{-5} .
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Determination of the Magnetic Dipole Moment of the rho meson using 4 pion electroproduction data
arXiv: High Energy Physics - Phenomenology, 2013Co-Authors: D. García Gudiño, G. Toledo SánchezAbstract:We determine the Magnetic Dipole Moment of the rho meson using preliminary data from the BaBar Collaboration for the $e^+ e^- \to \pi^+ \pi^- 2 \pi^0$ process, in the center of mass energy range from 0.9 to 2.2 GeV. We describe the $\gamma^* \to 4\pi$ vertex using a vector meson dominance model, including the intermediate resonance contributions relevant at these energies. We find that $\mu_\rho = 2.1 \pm 0.5$ in $e/2 m_\rho$ units.
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Extracting vector mesons Magnetic Dipole Moment from radiative decays
arXiv: High Energy Physics - Phenomenology, 2002Co-Authors: G. Toledo SánchezAbstract:The possibility that the Magnetic Dipole Moment (MDM) of light charged vector mesons could be measured from radiative processes involving the production (\tau \to \rho \nu \gamma) and decay(\rho \to \pi \pi \gamma) of vector mesons is studied in a model independent way, via the soft-photon approximation. The angular and energy distribution of photons emitted at small angles respect to the final charged particle is found be sensitive to the effects of the MDM. We also show that model dependent contributions have a general structure, by gauge invariance requirements, that allows suppress them in the same kinematical region where the MDM effect is more important in the model independent approach.
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Magnetic Dipole Moment of vector mesons
1999Co-Authors: G. López Castro, G. Toledo SánchezAbstract:We analyze the sensitivity to the vector-meson Magnetic Dipole Moment of radiative processes involving the production and decay of vector mesons. These studies assume that vector mesons are stable particles. We then discuss how to incorporate the finite-width effects in the calculations without spoiling the electroMagnetic gauge invariance of the scattering amplitudes.
M. Vanderhaeghen - One of the best experts on this subject based on the ideXlab platform.
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Unitary model for theγp→γπ0preaction and the Magnetic Dipole Moment of theΔ+(1232)
Physical Review C, 2005Co-Authors: Wentai Chiang, M. Vanderhaeghen, Shin Nan Yang, D. DrechselAbstract:Radiative pion photoproduction in the {Delta}(1232) resonance region is studied with the aim to access the {Delta}{sup +}(1232) Magnetic Dipole Moment. We present a unitary model of the {gamma}p {yields} {gamma}{pi}N ({pi}N) = ({pi}{sup 0}p, {pi}{sup +}n) reactions, where the {pi}N rescattering is included in an on-shell approximation. In this model, the low energy theorem which couples the {gamma}p {yields} {gamma}{pi}N process in the limit of a soft final photon to the {gamma}p {yields} {pi}N process is exactly satisfied. We study the sensitivity of the {gamma}p {yields} {gamma}{pi}{sup 0}p process at higher values of the final photon energy to the {Delta}{sup +}(1232) Magnetic Dipole Moment. We compare our results with existing data and give predictions for forthcoming measurements of angular and energy distributions. It is found that the photon asymmetry and a helicity cross section are particularly sensitive to the {Delta}{sup +} Magnetic Dipole Moment.
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Magnetic Dipole Moment of the s11 1535 from the γp γηp reaction
Nuclear Physics, 2003Co-Authors: Wentai Chiang, M. Vanderhaeghen, Shin Nan Yang, D. DrechselAbstract:Abstract The γp → γηp reaction in the S 11 (1535) resonance region is investigated as a method to access the S 11 (1535) Magnetic Dipole Moment. To study the feasibility, we perform calculations of the γp → γηp process within an effective Lagrangian approach containing both the S 11 resonant mechanism and a background of non-resonant contributions. Predictions are made for the forthcoming experiments. In particular, we focus on the sensitivity of cross sections and photon asymmetries to the S 11 (1535) Magnetic Dipole Moment.
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Magnetic Dipole Moment of the S11(1535) from the γp→γηp reaction
Nuclear Physics, 2003Co-Authors: Wentai Chiang, M. Vanderhaeghen, Shin Nan Yang, D. DrechselAbstract:Abstract The γp → γηp reaction in the S 11 (1535) resonance region is investigated as a method to access the S 11 (1535) Magnetic Dipole Moment. To study the feasibility, we perform calculations of the γp → γηp process within an effective Lagrangian approach containing both the S 11 resonant mechanism and a background of non-resonant contributions. Predictions are made for the forthcoming experiments. In particular, we focus on the sensitivity of cross sections and photon asymmetries to the S 11 (1535) Magnetic Dipole Moment.
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Magnetic Dipole Moment of the s11 1535 from the gamma p to gamma eta p reaction
arXiv: Nuclear Theory, 2002Co-Authors: Wentai Chiang, M. Vanderhaeghen, Shin Nan Yang, D. DrechselAbstract:The \gamma p \to \gamma \eta p reaction in the S11(1535) resonance region is investigated as a method to access the S11(1535) Magnetic Dipole Moment. To study the feasibility, we perform calculations of the \gamma p \to \gamma \eta p process within an effective Lagrangian approach containing both the S11 resonant mechanism and a background of non-resonant contributions. Predictions are made for the forthcoming experiments. In particular, we focus on the sensitivity of cross sections and photon asymmetries to the S11(1535) Magnetic Dipole Moment.
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Magnetic Dipole Moment of theΔ+(1232)from theγp→γπ0preaction
Physical Review C, 2001Co-Authors: D. Drechsel, M. VanderhaeghenAbstract:The $\gamma p \to \gamma \pi^0 p$ reaction in the $\Delta(1232)$-resonance region is investigated as a method to access the $\Delta^+(1232)$ Magnetic Dipole Moment. The calculations are performed within the context of an effective Lagrangian model containing both the $\Delta$-resonant mechanism and a background of non-resonant contributions to the $\gamma p \to \gamma \pi^0 p$ reaction. Results are shown both for existing and forthcoming $\gamma p \to \gamma \pi^0 p$ experiments. In particular, the sensitivity of unpolarized cross sections and photon asymmetries to the $\Delta^+$ Magnetic Dipole Moment is displayed for those forthcoming data.
Nikolay Minkov - One of the best experts on this subject based on the ideXlab platform.
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theoretical predictions for the Magnetic Dipole Moment of th m 229
Physical Review Letters, 2019Co-Authors: Nikolay Minkov, Adriana PálffyAbstract:: A recent laser spectroscopy experiment [J. Thielking et al., Nature, (London) 556, 321 (2018)] has determined for the first time the Magnetic Dipole Moment of the 7.8 eV isomeric state ^{229m}Th. The measured value differs by a factor of approximately 5 from previous nuclear theory predictions based on the Nilsson model, raising questions about our understanding of the underlying nuclear structure. Here, we present a new theoretical prediction based on a nuclear model with coupled collective quadrupole-octupole and single-particle motions. Our calculations yield an isomer Magnetic Dipole Moment of μ_{IS}=-0.35μ_{N} in surprisingly good agreement with the experimentally determined value of -0.37(6)μ_{N}, while overestimating the ground state Dipole Moment by a factor 1.4. The model provides further information on the role and strength of the Coriolis mixing and the most probable value of the gyroMagnetic ratio g_{R} and its consequences for the transition probability B(M1). The key role of the Magnetic Moment values as constraints in the determination of the isomer decay rates is discussed.
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Theoretical predictions for the Magnetic Dipole Moment of $^{229m}$Th
arXiv: Nuclear Theory, 2018Co-Authors: Nikolay Minkov, Adriana PálffyAbstract:A recent laser spectroscopy experiment [J. Thielking et al., Nature (London) 556, 321 (2018)] has determined for the first time the Magnetic Dipole Moment of the 7.8 eV isomeric state $^{229m}$Th. The measured value differs by a factor of approximately 5 from previous nuclear theory predictions based on the Nilsson model, raising questions about our understanding of the underlying nuclear structure. Here, we present a new theoretical prediction based on a nuclear model with coupled collective quadrupole-octupole and single-particle motions. Our calculations yield an isomer Magnetic Dipole Moment of $\mu_{ IS}= -0.35\mu_N$ in surprisingly good agreement with the experimentally determined value of $-0.37(6)\mu_N$, while overestimating the ground state Dipole Moment by a factor 1.4. The model provides further information on the states' parity mixing, the role and strength of the Coriolis mixing and the most probable value of the gyroMagnetic ratio $g_R$ and its consequences for the transition probability $B(M1)$.
Wentai Chiang - One of the best experts on this subject based on the ideXlab platform.
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Unitary model for theγp→γπ0preaction and the Magnetic Dipole Moment of theΔ+(1232)
Physical Review C, 2005Co-Authors: Wentai Chiang, M. Vanderhaeghen, Shin Nan Yang, D. DrechselAbstract:Radiative pion photoproduction in the {Delta}(1232) resonance region is studied with the aim to access the {Delta}{sup +}(1232) Magnetic Dipole Moment. We present a unitary model of the {gamma}p {yields} {gamma}{pi}N ({pi}N) = ({pi}{sup 0}p, {pi}{sup +}n) reactions, where the {pi}N rescattering is included in an on-shell approximation. In this model, the low energy theorem which couples the {gamma}p {yields} {gamma}{pi}N process in the limit of a soft final photon to the {gamma}p {yields} {pi}N process is exactly satisfied. We study the sensitivity of the {gamma}p {yields} {gamma}{pi}{sup 0}p process at higher values of the final photon energy to the {Delta}{sup +}(1232) Magnetic Dipole Moment. We compare our results with existing data and give predictions for forthcoming measurements of angular and energy distributions. It is found that the photon asymmetry and a helicity cross section are particularly sensitive to the {Delta}{sup +} Magnetic Dipole Moment.
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Magnetic Dipole Moment of the s11 1535 from the γp γηp reaction
Nuclear Physics, 2003Co-Authors: Wentai Chiang, M. Vanderhaeghen, Shin Nan Yang, D. DrechselAbstract:Abstract The γp → γηp reaction in the S 11 (1535) resonance region is investigated as a method to access the S 11 (1535) Magnetic Dipole Moment. To study the feasibility, we perform calculations of the γp → γηp process within an effective Lagrangian approach containing both the S 11 resonant mechanism and a background of non-resonant contributions. Predictions are made for the forthcoming experiments. In particular, we focus on the sensitivity of cross sections and photon asymmetries to the S 11 (1535) Magnetic Dipole Moment.
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Magnetic Dipole Moment of the S11(1535) from the γp→γηp reaction
Nuclear Physics, 2003Co-Authors: Wentai Chiang, M. Vanderhaeghen, Shin Nan Yang, D. DrechselAbstract:Abstract The γp → γηp reaction in the S 11 (1535) resonance region is investigated as a method to access the S 11 (1535) Magnetic Dipole Moment. To study the feasibility, we perform calculations of the γp → γηp process within an effective Lagrangian approach containing both the S 11 resonant mechanism and a background of non-resonant contributions. Predictions are made for the forthcoming experiments. In particular, we focus on the sensitivity of cross sections and photon asymmetries to the S 11 (1535) Magnetic Dipole Moment.
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Magnetic Dipole Moment of the s11 1535 from the gamma p to gamma eta p reaction
arXiv: Nuclear Theory, 2002Co-Authors: Wentai Chiang, M. Vanderhaeghen, Shin Nan Yang, D. DrechselAbstract:The \gamma p \to \gamma \eta p reaction in the S11(1535) resonance region is investigated as a method to access the S11(1535) Magnetic Dipole Moment. To study the feasibility, we perform calculations of the \gamma p \to \gamma \eta p process within an effective Lagrangian approach containing both the S11 resonant mechanism and a background of non-resonant contributions. Predictions are made for the forthcoming experiments. In particular, we focus on the sensitivity of cross sections and photon asymmetries to the S11(1535) Magnetic Dipole Moment.
