The Experts below are selected from a list of 21327 Experts worldwide ranked by ideXlab platform
Stoffer Peter - One of the best experts on this subject based on the ideXlab platform.
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A dispersive estimate of scalar contributions to hadronic light-by-light scattering
'Elsevier BV', 2021Co-Authors: Danilkin Igor, Hoferichter Martin, Stoffer PeterAbstract:We consider the contribution of scalar resonances to hadronic light-by-light scattering in the anomalous magnetic moment of the muon. While the f0(500)has already been addressed in previous work using dispersion relations, heavier scalar resonances have only been estimated in hadronic models so far. Here, we compare an implementation of the f0(980)resonance in terms of the coupled-channel S-waves for γ∗γ∗→ππ/ ̄KKto a narrow-width approximation, which indicates aHLbLμ[f0(980)] =−0.2(2) ×10−11. With a similar estimate for the a0(980), the combined effect is thus well below 1 ×10−11in absolute value. We also estimate the contribution of heavier scalar resonances. In view of the very Uncertain Situation concerning their two-photon couplings we suggest to treat them together with other resonances of similar mass when imposing the matching to short-distance constraints. Our final result is a refined estimate of the S-wave rescattering effects in the ππand ̄KKchannel up to about 1.3GeV and including a narrow-width evaluation of the a0(980): aHLbLμ[scalars] =−9(1) ×10−11
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A dispersive estimate of scalar contributions to hadronic light-by-light scattering
'Elsevier BV', 2021Co-Authors: Danilkin Igor, Hoferichter Martin, Stoffer PeterAbstract:We consider the contribution of scalar resonances to hadronic light-by-light scattering in the anomalous magnetic moment of the muon. While the $f_0(500)$ has already been addressed in previous work using dispersion relations, heavier scalar resonances have only been estimated in hadronic models so far. Here, we compare an implementation of the $f_0(980)$ resonance in terms of the coupled-channel $S$-waves for $\gamma^*\gamma^*\to \pi\pi/\bar K K$ to a narrow-width approximation, which indicates $a_\mu^{\text{HLbL}}[f_0(980)]=-0.2(2)\times 10^{-11}$. With a similar estimate for the $a_0(980)$, the combined effect is thus well below $1\times 10^{-11}$ in absolute value. We also estimate the contribution of heavier scalar resonances. In view of the very Uncertain Situation concerning their two-photon couplings we suggest to treat them together with other resonances of similar mass when imposing the matching to short-distance constraints. Our final result is a refined estimate of the $S$-wave rescattering effects in the $\pi \pi$ and $\bar K K$ channel up to about $1.3$ GeV and including a narrow-width evaluation of the $a_0(980)$: $a_\mu^\text{HLbL}[\text{scalars}]=-9(1)\times 10^{-11}$.Comment: 9 pages, 2 figures; journal versio
Danilkin Igor - One of the best experts on this subject based on the ideXlab platform.
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A dispersive estimate of scalar contributions to hadronic light-by-light scattering
'Elsevier BV', 2021Co-Authors: Danilkin Igor, Hoferichter Martin, Stoffer PeterAbstract:We consider the contribution of scalar resonances to hadronic light-by-light scattering in the anomalous magnetic moment of the muon. While the f0(500)has already been addressed in previous work using dispersion relations, heavier scalar resonances have only been estimated in hadronic models so far. Here, we compare an implementation of the f0(980)resonance in terms of the coupled-channel S-waves for γ∗γ∗→ππ/ ̄KKto a narrow-width approximation, which indicates aHLbLμ[f0(980)] =−0.2(2) ×10−11. With a similar estimate for the a0(980), the combined effect is thus well below 1 ×10−11in absolute value. We also estimate the contribution of heavier scalar resonances. In view of the very Uncertain Situation concerning their two-photon couplings we suggest to treat them together with other resonances of similar mass when imposing the matching to short-distance constraints. Our final result is a refined estimate of the S-wave rescattering effects in the ππand ̄KKchannel up to about 1.3GeV and including a narrow-width evaluation of the a0(980): aHLbLμ[scalars] =−9(1) ×10−11
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A dispersive estimate of scalar contributions to hadronic light-by-light scattering
'Elsevier BV', 2021Co-Authors: Danilkin Igor, Hoferichter Martin, Stoffer PeterAbstract:We consider the contribution of scalar resonances to hadronic light-by-light scattering in the anomalous magnetic moment of the muon. While the $f_0(500)$ has already been addressed in previous work using dispersion relations, heavier scalar resonances have only been estimated in hadronic models so far. Here, we compare an implementation of the $f_0(980)$ resonance in terms of the coupled-channel $S$-waves for $\gamma^*\gamma^*\to \pi\pi/\bar K K$ to a narrow-width approximation, which indicates $a_\mu^{\text{HLbL}}[f_0(980)]=-0.2(2)\times 10^{-11}$. With a similar estimate for the $a_0(980)$, the combined effect is thus well below $1\times 10^{-11}$ in absolute value. We also estimate the contribution of heavier scalar resonances. In view of the very Uncertain Situation concerning their two-photon couplings we suggest to treat them together with other resonances of similar mass when imposing the matching to short-distance constraints. Our final result is a refined estimate of the $S$-wave rescattering effects in the $\pi \pi$ and $\bar K K$ channel up to about $1.3$ GeV and including a narrow-width evaluation of the $a_0(980)$: $a_\mu^\text{HLbL}[\text{scalars}]=-9(1)\times 10^{-11}$.Comment: 9 pages, 2 figures; journal versio
Novas Jorge - One of the best experts on this subject based on the ideXlab platform.
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Corporate Legitimacy and COVID 19 - Chilean citizens' perceptions during confinement
'Universidad Rey Juan Carlos', 2020Co-Authors: Blanco-gonzález Alicia, Novas JorgeAbstract:The health emergency caused by COVID 19 has created a complex context from the health point of view, but also from a social, economic and political perspective, which has led to an Uncertain Situation regarding the future Before COVID 19 companies were focused on the United Nations Sustainable Development Goals During this Situation we have seen how some of these goals improve ( while others worsen in societies where many of them were already surpassed It is disturbing to see the increase in the economic, salary and gender gap, the entrepreneurship problems, the loss of rights and liberties as well as the lack of respect to the elderly This Situation made us think whether the institutions and companies were being responsible given the circumstances or not, if they were behaving in an ethical manner, and if their behavior during confinement was going to generate changes in the citizens' habits Therefore, we asked ourselves, are companies doing what they should? Are they legitimate? Are they adapting to this reality and helping the population? In this study, we present the responses to the questions regarding the relationship between companies and Covid 19 responsible behavior, impact on our future consumption habits, our government and the legitimacy of companies during the confinement in Chil
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Corporate Legitimacy and COVID 19 Perceptions during the crisis in Peru
'Universidad Rey Juan Carlos', 2020Co-Authors: Blanco-gonzález Alicia, Novas JorgeAbstract:The health emergency caused by COVID 19 has created a complex context from the health point of view, but also from a social, economic and political perspective, which has led to an Uncertain Situation regarding the future Before COVID 19 companies were focused on the United Nations Sustainable Development Goals During this Situation we have seen how some of these goals improve ( while others worsen in societies where many of them were already surpassed It is disturbing to see the increase in the economic, salary and gender gap, the entrepreneurship problems, the loss of rights and liberties as well as the lack of respect to the elderly This Situation made us think whether the institutions and companies were being responsible given the circumstances or not, if they were behaving in an ethical manner, and if their behavior during confinement was going to generate changes in the citizens' habits Therefore, we asked ourselves, are companies doing what they should? Are they legitimate? Are they adapting to this reality and helping the population? In this study, we present the responses to the questions regarding the relationship between companies and Covid 19 responsible behavior, impact on our future consumption habits, our government and the legitimacy of companies during the confinement in Per
Hoferichter Martin - One of the best experts on this subject based on the ideXlab platform.
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A dispersive estimate of scalar contributions to hadronic light-by-light scattering
'Elsevier BV', 2021Co-Authors: Danilkin Igor, Hoferichter Martin, Stoffer PeterAbstract:We consider the contribution of scalar resonances to hadronic light-by-light scattering in the anomalous magnetic moment of the muon. While the f0(500)has already been addressed in previous work using dispersion relations, heavier scalar resonances have only been estimated in hadronic models so far. Here, we compare an implementation of the f0(980)resonance in terms of the coupled-channel S-waves for γ∗γ∗→ππ/ ̄KKto a narrow-width approximation, which indicates aHLbLμ[f0(980)] =−0.2(2) ×10−11. With a similar estimate for the a0(980), the combined effect is thus well below 1 ×10−11in absolute value. We also estimate the contribution of heavier scalar resonances. In view of the very Uncertain Situation concerning their two-photon couplings we suggest to treat them together with other resonances of similar mass when imposing the matching to short-distance constraints. Our final result is a refined estimate of the S-wave rescattering effects in the ππand ̄KKchannel up to about 1.3GeV and including a narrow-width evaluation of the a0(980): aHLbLμ[scalars] =−9(1) ×10−11
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A dispersive estimate of scalar contributions to hadronic light-by-light scattering
'Elsevier BV', 2021Co-Authors: Danilkin Igor, Hoferichter Martin, Stoffer PeterAbstract:We consider the contribution of scalar resonances to hadronic light-by-light scattering in the anomalous magnetic moment of the muon. While the $f_0(500)$ has already been addressed in previous work using dispersion relations, heavier scalar resonances have only been estimated in hadronic models so far. Here, we compare an implementation of the $f_0(980)$ resonance in terms of the coupled-channel $S$-waves for $\gamma^*\gamma^*\to \pi\pi/\bar K K$ to a narrow-width approximation, which indicates $a_\mu^{\text{HLbL}}[f_0(980)]=-0.2(2)\times 10^{-11}$. With a similar estimate for the $a_0(980)$, the combined effect is thus well below $1\times 10^{-11}$ in absolute value. We also estimate the contribution of heavier scalar resonances. In view of the very Uncertain Situation concerning their two-photon couplings we suggest to treat them together with other resonances of similar mass when imposing the matching to short-distance constraints. Our final result is a refined estimate of the $S$-wave rescattering effects in the $\pi \pi$ and $\bar K K$ channel up to about $1.3$ GeV and including a narrow-width evaluation of the $a_0(980)$: $a_\mu^\text{HLbL}[\text{scalars}]=-9(1)\times 10^{-11}$.Comment: 9 pages, 2 figures; journal versio
Blanco-gonzález Alicia - One of the best experts on this subject based on the ideXlab platform.
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Corporate Legitimacy and COVID 19 - Chilean citizens' perceptions during confinement
'Universidad Rey Juan Carlos', 2020Co-Authors: Blanco-gonzález Alicia, Novas JorgeAbstract:The health emergency caused by COVID 19 has created a complex context from the health point of view, but also from a social, economic and political perspective, which has led to an Uncertain Situation regarding the future Before COVID 19 companies were focused on the United Nations Sustainable Development Goals During this Situation we have seen how some of these goals improve ( while others worsen in societies where many of them were already surpassed It is disturbing to see the increase in the economic, salary and gender gap, the entrepreneurship problems, the loss of rights and liberties as well as the lack of respect to the elderly This Situation made us think whether the institutions and companies were being responsible given the circumstances or not, if they were behaving in an ethical manner, and if their behavior during confinement was going to generate changes in the citizens' habits Therefore, we asked ourselves, are companies doing what they should? Are they legitimate? Are they adapting to this reality and helping the population? In this study, we present the responses to the questions regarding the relationship between companies and Covid 19 responsible behavior, impact on our future consumption habits, our government and the legitimacy of companies during the confinement in Chil
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Corporate Legitimacy and COVID 19 Perceptions during the crisis in Peru
'Universidad Rey Juan Carlos', 2020Co-Authors: Blanco-gonzález Alicia, Novas JorgeAbstract:The health emergency caused by COVID 19 has created a complex context from the health point of view, but also from a social, economic and political perspective, which has led to an Uncertain Situation regarding the future Before COVID 19 companies were focused on the United Nations Sustainable Development Goals During this Situation we have seen how some of these goals improve ( while others worsen in societies where many of them were already surpassed It is disturbing to see the increase in the economic, salary and gender gap, the entrepreneurship problems, the loss of rights and liberties as well as the lack of respect to the elderly This Situation made us think whether the institutions and companies were being responsible given the circumstances or not, if they were behaving in an ethical manner, and if their behavior during confinement was going to generate changes in the citizens' habits Therefore, we asked ourselves, are companies doing what they should? Are they legitimate? Are they adapting to this reality and helping the population? In this study, we present the responses to the questions regarding the relationship between companies and Covid 19 responsible behavior, impact on our future consumption habits, our government and the legitimacy of companies during the confinement in Per