The Experts below are selected from a list of 63441 Experts worldwide ranked by ideXlab platform
Zoltan Fodor - One of the best experts on this subject based on the ideXlab platform.
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leptonic Decay Constant ratio fk fπ from lattice qcd using 2 1 clover improved fermion flavors with 2 hex smearing
Physical Review D, 2017Co-Authors: S Durr, Zoltan Fodor, Christian Hoelbling, Stefan Krieg, Laurent Lellouch, Thomas LippertAbstract:We present a calculation of the leptonic Decay-Constant ratio $f_K/f_\pi$ in 2+1 flavor QCD, performed via a series of lattice studies, which allows us to quantify all sources of systematic uncertainty. Our final result is $f_K/f_\pi=1.182(28)$, and with isospin breaking corrections from ChPT the charged Decay-Constant ratio reads $f_{K^\pm}/f_{\pi^\pm}=1.178(28)$. With $V_\mathrm{ud}$ from super-allowed nuclear beta Decays, the CKM matrix element $V_\mathrm{us}=0.2282(54)$ is perfectly compatible with the first-row unitarity constraint of the Standard Model.
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leptonic Decay Constant ratio f_k f_ pi from lattice qcd using 2 1 clover improved fermion flavors with 2 hex smearing
Physical Review D, 2017Co-Authors: S Durr, Zoltan Fodor, Christian Hoelbling, Stefan Krieg, Laurent Lellouch, Thomas LippertAbstract:We present a calculation of the leptonic Decay-Constant ratio $f_K/f_\pi$ in 2+1 flavor QCD, performed via a series of lattice studies, which allows us to quantify all sources of systematic uncertainty. Our final result is $f_K/f_\pi=1.182(28)$, and with isospin breaking corrections from ChPT the charged Decay-Constant ratio reads $f_{K^\pm}/f_{\pi^\pm}=1.178(28)$. With $V_\mathrm{ud}$ from super-allowed nuclear beta Decays, the CKM matrix element $V_\mathrm{us}=0.2282(54)$ is perfectly compatible with the first-row unitarity constraint of the Standard Model.
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su 2 chiral perturbation theory low energy Constants from 2 1 flavor staggered lattice simulations
Physical Review D, 2013Co-Authors: Szabolcs Borsanyi, S Durr, Zoltan Fodor, Stefan Krieg, A Schafer, Enno E ScholzAbstract:We extract the next-to-leading-order low-energy Constants ${\overline{\ensuremath{\ell}}}_{3}$ and ${\overline{\ensuremath{\ell}}}_{4}$ of SU(2) chiral perturbation theory, based on precise lattice data for the pion mass and Decay Constant on ensembles generated by the Wuppertal-Budapest Collaboration for QCD thermodynamics. These ensembles feature $2+1$ flavors of two-fold stout-smeared dynamical staggered fermions combined with Symanzik glue, with pion masses varying from 135 to 435 MeV, lattice scales between 0.7 and 2.0 GeV, while ${m}_{s}$ is kept fixed at its physical value. Moderate taste splittings and the scale being set through the pion Decay Constant allow us to restrict ourselves to the taste pseudoscalar state and to use formulas from continuum chiral perturbation theory. Finally, by dropping the data points near 135 MeV from the fits, we can explore the range of pion masses that is needed in SU(2) chiral perturbation theory to reliably extrapolate to the physical point.
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the qcd transition temperature results with physical masses in the continuum limit ii
Journal of High Energy Physics, 2009Co-Authors: Yasumichi Aoki, Zoltan Fodor, Stefan Krieg, Szabolcs Borsanyi, Stephan Durr, S D Katz, K K SzaboAbstract:We extend our previous study [Phys. Lett. B 643 (2006) 46] of the cross-over temperatures (Tc) of QCD. We improve our zero temperature analysis by using physical quark masses and finer lattices. In addition to the kaon Decay Constant used for scale setting we determine four quantities (masses of the Ω baryon, K*(892) and (1020) mesons and the pion Decay Constant) which are found to agree with experiment. This implies that — independently of which of these quantities is used to set the overall scale — the same results are obtained within a few percent. At finite temperature we use finer lattices down to a0.1 fm (Nt = 12 and Nt = 16 at one point). Our new results confirm completely our previous findings. We compare the results with those of the 'hotQCD' collaboration.
S Durr - One of the best experts on this subject based on the ideXlab platform.
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leptonic Decay Constant ratio fk fπ from lattice qcd using 2 1 clover improved fermion flavors with 2 hex smearing
Physical Review D, 2017Co-Authors: S Durr, Zoltan Fodor, Christian Hoelbling, Stefan Krieg, Laurent Lellouch, Thomas LippertAbstract:We present a calculation of the leptonic Decay-Constant ratio $f_K/f_\pi$ in 2+1 flavor QCD, performed via a series of lattice studies, which allows us to quantify all sources of systematic uncertainty. Our final result is $f_K/f_\pi=1.182(28)$, and with isospin breaking corrections from ChPT the charged Decay-Constant ratio reads $f_{K^\pm}/f_{\pi^\pm}=1.178(28)$. With $V_\mathrm{ud}$ from super-allowed nuclear beta Decays, the CKM matrix element $V_\mathrm{us}=0.2282(54)$ is perfectly compatible with the first-row unitarity constraint of the Standard Model.
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leptonic Decay Constant ratio f_k f_ pi from lattice qcd using 2 1 clover improved fermion flavors with 2 hex smearing
Physical Review D, 2017Co-Authors: S Durr, Zoltan Fodor, Christian Hoelbling, Stefan Krieg, Laurent Lellouch, Thomas LippertAbstract:We present a calculation of the leptonic Decay-Constant ratio $f_K/f_\pi$ in 2+1 flavor QCD, performed via a series of lattice studies, which allows us to quantify all sources of systematic uncertainty. Our final result is $f_K/f_\pi=1.182(28)$, and with isospin breaking corrections from ChPT the charged Decay-Constant ratio reads $f_{K^\pm}/f_{\pi^\pm}=1.178(28)$. With $V_\mathrm{ud}$ from super-allowed nuclear beta Decays, the CKM matrix element $V_\mathrm{us}=0.2282(54)$ is perfectly compatible with the first-row unitarity constraint of the Standard Model.
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su 2 chiral perturbation theory low energy Constants from 2 1 flavor staggered lattice simulations
Physical Review D, 2013Co-Authors: Szabolcs Borsanyi, S Durr, Zoltan Fodor, Stefan Krieg, A Schafer, Enno E ScholzAbstract:We extract the next-to-leading-order low-energy Constants ${\overline{\ensuremath{\ell}}}_{3}$ and ${\overline{\ensuremath{\ell}}}_{4}$ of SU(2) chiral perturbation theory, based on precise lattice data for the pion mass and Decay Constant on ensembles generated by the Wuppertal-Budapest Collaboration for QCD thermodynamics. These ensembles feature $2+1$ flavors of two-fold stout-smeared dynamical staggered fermions combined with Symanzik glue, with pion masses varying from 135 to 435 MeV, lattice scales between 0.7 and 2.0 GeV, while ${m}_{s}$ is kept fixed at its physical value. Moderate taste splittings and the scale being set through the pion Decay Constant allow us to restrict ourselves to the taste pseudoscalar state and to use formulas from continuum chiral perturbation theory. Finally, by dropping the data points near 135 MeV from the fits, we can explore the range of pion masses that is needed in SU(2) chiral perturbation theory to reliably extrapolate to the physical point.
Stefan Krieg - One of the best experts on this subject based on the ideXlab platform.
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leptonic Decay Constant ratio fk fπ from lattice qcd using 2 1 clover improved fermion flavors with 2 hex smearing
Physical Review D, 2017Co-Authors: S Durr, Zoltan Fodor, Christian Hoelbling, Stefan Krieg, Laurent Lellouch, Thomas LippertAbstract:We present a calculation of the leptonic Decay-Constant ratio $f_K/f_\pi$ in 2+1 flavor QCD, performed via a series of lattice studies, which allows us to quantify all sources of systematic uncertainty. Our final result is $f_K/f_\pi=1.182(28)$, and with isospin breaking corrections from ChPT the charged Decay-Constant ratio reads $f_{K^\pm}/f_{\pi^\pm}=1.178(28)$. With $V_\mathrm{ud}$ from super-allowed nuclear beta Decays, the CKM matrix element $V_\mathrm{us}=0.2282(54)$ is perfectly compatible with the first-row unitarity constraint of the Standard Model.
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leptonic Decay Constant ratio f_k f_ pi from lattice qcd using 2 1 clover improved fermion flavors with 2 hex smearing
Physical Review D, 2017Co-Authors: S Durr, Zoltan Fodor, Christian Hoelbling, Stefan Krieg, Laurent Lellouch, Thomas LippertAbstract:We present a calculation of the leptonic Decay-Constant ratio $f_K/f_\pi$ in 2+1 flavor QCD, performed via a series of lattice studies, which allows us to quantify all sources of systematic uncertainty. Our final result is $f_K/f_\pi=1.182(28)$, and with isospin breaking corrections from ChPT the charged Decay-Constant ratio reads $f_{K^\pm}/f_{\pi^\pm}=1.178(28)$. With $V_\mathrm{ud}$ from super-allowed nuclear beta Decays, the CKM matrix element $V_\mathrm{us}=0.2282(54)$ is perfectly compatible with the first-row unitarity constraint of the Standard Model.
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su 2 chiral perturbation theory low energy Constants from 2 1 flavor staggered lattice simulations
Physical Review D, 2013Co-Authors: Szabolcs Borsanyi, S Durr, Zoltan Fodor, Stefan Krieg, A Schafer, Enno E ScholzAbstract:We extract the next-to-leading-order low-energy Constants ${\overline{\ensuremath{\ell}}}_{3}$ and ${\overline{\ensuremath{\ell}}}_{4}$ of SU(2) chiral perturbation theory, based on precise lattice data for the pion mass and Decay Constant on ensembles generated by the Wuppertal-Budapest Collaboration for QCD thermodynamics. These ensembles feature $2+1$ flavors of two-fold stout-smeared dynamical staggered fermions combined with Symanzik glue, with pion masses varying from 135 to 435 MeV, lattice scales between 0.7 and 2.0 GeV, while ${m}_{s}$ is kept fixed at its physical value. Moderate taste splittings and the scale being set through the pion Decay Constant allow us to restrict ourselves to the taste pseudoscalar state and to use formulas from continuum chiral perturbation theory. Finally, by dropping the data points near 135 MeV from the fits, we can explore the range of pion masses that is needed in SU(2) chiral perturbation theory to reliably extrapolate to the physical point.
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the qcd transition temperature results with physical masses in the continuum limit ii
Journal of High Energy Physics, 2009Co-Authors: Yasumichi Aoki, Zoltan Fodor, Stefan Krieg, Szabolcs Borsanyi, Stephan Durr, S D Katz, K K SzaboAbstract:We extend our previous study [Phys. Lett. B 643 (2006) 46] of the cross-over temperatures (Tc) of QCD. We improve our zero temperature analysis by using physical quark masses and finer lattices. In addition to the kaon Decay Constant used for scale setting we determine four quantities (masses of the Ω baryon, K*(892) and (1020) mesons and the pion Decay Constant) which are found to agree with experiment. This implies that — independently of which of these quantities is used to set the overall scale — the same results are obtained within a few percent. At finite temperature we use finer lattices down to a0.1 fm (Nt = 12 and Nt = 16 at one point). Our new results confirm completely our previous findings. We compare the results with those of the 'hotQCD' collaboration.
M Ablikim - One of the best experts on this subject based on the ideXlab platform.
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determination of the pseudoscalar Decay Constant f_ d_s via d_s to mu nu_ mu
Physical Review Letters, 2019Co-Authors: M Ablikim, M N Achasov, M Albrecht, A Amoroso, O Bakina, Baldini R Ferroli, S Ahmed, M Alekseev, Y Bai, Y BanAbstract:Using a 3.19 fb^{-1} data sample collected at an e^{+}e^{-} center-of-mass energy of E_{cm}=4.178 GeV with the BESIII detector, we measure the branching fraction of the leptonic Decay D_{s}^{+}→μ^{+}ν_{μ} to be B_{D_{s}^{+}→μ^{+}ν_{μ}}=(5.49±0.16_{stat}±0.15_{syst})×10^{-3}. Combining our branching fraction with the masses of the D_{s}^{+} and μ^{+} and the lifetime of the D_{s}^{+}, we determine f_{D_{s}^{+}}|V_{cs}|=246.2±3.6_{stat}±3.5_{syst} MeV. Using the c→s quark mixing matrix element |V_{cs}| determined from a global standard model fit, we evaluate the D_{s}^{+} Decay Constant f_{D_{s}^{+}}=252.9±3.7_{stat}±3.6_{syst} MeV. Alternatively, using the value of f_{D_{s}^{+}} calculated by lattice quantum chromodynamics, we find |V_{cs}|=0.985±0.014_{stat}±0.014_{syst}. These values of B_{D_{s}^{+}→μ^{+}ν_{μ}}, f_{D_{s}^{+}}|V_{cs}|, f_{D_{s}^{+}} and |V_{cs}| are each the most precise results to date.
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measurement of the ds l ve branching fractions and the Decay Constant fds
Physical Review D, 2016Co-Authors: M Ablikim, M N Achasov, O Albayrak, M Albrecht, D J Ambrose, A Amoroso, J Z Bai, O Bakina, Baldini R Ferroli, Y BanAbstract:Using 482 pb(-1) of e(+) e(-) collision data collected at a center-of-mass energy of root s = 4.009 GeV with the BESIII detector, we measure the branching fractions of the Decays D-s(+) -> u(+)v(u) and D-s(+) -> tau(+)v(tau). By constraining the ratio of Decay rates of Ds(+) to tau(+)v(u) and to u(+)v(u) to the Standard Model prediction, the branching fractions are determined to be B(D-s(+) -> u(+)v(u) = (0.495 +/- 0.067 +/- 0.026)% and B(D-s(+) -> tau(+)v(tau) = (4.83 +/- 0.65 +/- 0.26)% Using these branching fractions, we obtain a value for the Decay Constant f(Ds+) of (241.0 +/- 16.3 +/- 6.5) MeV, where the first error is statistical and the second systematic.
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precision measurements of b d mu nu mu the pseudoscalar Decay Constant fd and the quark mixing matrix element vertical bar v cd vertical bar
Physical Review D, 2014Co-Authors: M Ablikim, M N Achasov, O Albayrak, D J Ambrose, J Z Bai, Baldini R Ferroli, Y Ban, J V Bennett, M BertaniAbstract:We report a measurement of the branching fraction B(D+ -> mu(+)nu(mu)) = [3.71 +/- 0.19(stat) +/- 0.06(sys)] x 10(-4) based on 2.92 fb(-1) of data accumulated at root s = 3.773 GeV with the BESIII detector at the BEPCII collider. This measurement, in conjunction with the Cabibbo-Kobayashi-Maskawa matrix element vertical bar V-cd vertical bar determined from a global Standard Model fit, implies a value for the weak Decay Constant f(D+) = (203.2 +/- 5.3 +/- 1.8) MeV. Additionally, using this branching fraction measurement together with a lattice QCD prediction for f(D+), we find vertical bar V-cd vertical bar 0.2210 +/- 0.0058 +/- 0.0047. In either case, these are the most precise results for these quantities to date.
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precision measurements of b d rightarrow mu nu_ mu the pseudoscalar Decay Constant f_ d and the quark mixing matrix element v_ rm cd
Physical Review D, 2013Co-Authors: M Ablikim, H X Yang, Z P Zhang, T Hussain, T Held, C L Liu, G Varner, F Liu, W X Gong, S BraunAbstract:We report a measurement of the branching fraction $B(D^+ \rightarrow \mu^+ \nu_{\mu}) = [3.71 \pm 0.19 (\rm stat) \pm 0.06 (\rm sys)]\times 10^{-4}$ based on 2.92 ${\rm fb^{-1}}$ of data accumulated at $\sqrt{s}=3.773$ GeV with the BESIII detector at the BEPCII collider. This measurement, in conjunction with the Cabibbo-Kobayashi-Maskawa matrix element $|V_{\rm cd}|$ determined from a global Standard Model fit, implies a value for the weak Decay Constant $f_{D^+}=(203.2 \pm 5.3 \pm 1.8)$ MeV. Additionally, using this branching fraction measurement together with a Lattice QCD prediction for $f_{D^+}$, we find $|V_{\rm cd}|=0.2210\pm 0.0058 \pm 0.0047$. In either case, these are the most precise results for these quantities to date.
Y Ban - One of the best experts on this subject based on the ideXlab platform.
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determination of the pseudoscalar Decay Constant f_ d_s via d_s to mu nu_ mu
Physical Review Letters, 2019Co-Authors: M Ablikim, M N Achasov, M Albrecht, A Amoroso, O Bakina, Baldini R Ferroli, S Ahmed, M Alekseev, Y Bai, Y BanAbstract:Using a 3.19 fb^{-1} data sample collected at an e^{+}e^{-} center-of-mass energy of E_{cm}=4.178 GeV with the BESIII detector, we measure the branching fraction of the leptonic Decay D_{s}^{+}→μ^{+}ν_{μ} to be B_{D_{s}^{+}→μ^{+}ν_{μ}}=(5.49±0.16_{stat}±0.15_{syst})×10^{-3}. Combining our branching fraction with the masses of the D_{s}^{+} and μ^{+} and the lifetime of the D_{s}^{+}, we determine f_{D_{s}^{+}}|V_{cs}|=246.2±3.6_{stat}±3.5_{syst} MeV. Using the c→s quark mixing matrix element |V_{cs}| determined from a global standard model fit, we evaluate the D_{s}^{+} Decay Constant f_{D_{s}^{+}}=252.9±3.7_{stat}±3.6_{syst} MeV. Alternatively, using the value of f_{D_{s}^{+}} calculated by lattice quantum chromodynamics, we find |V_{cs}|=0.985±0.014_{stat}±0.014_{syst}. These values of B_{D_{s}^{+}→μ^{+}ν_{μ}}, f_{D_{s}^{+}}|V_{cs}|, f_{D_{s}^{+}} and |V_{cs}| are each the most precise results to date.
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measurement of the ds l ve branching fractions and the Decay Constant fds
Physical Review D, 2016Co-Authors: M Ablikim, M N Achasov, O Albayrak, M Albrecht, D J Ambrose, A Amoroso, J Z Bai, O Bakina, Baldini R Ferroli, Y BanAbstract:Using 482 pb(-1) of e(+) e(-) collision data collected at a center-of-mass energy of root s = 4.009 GeV with the BESIII detector, we measure the branching fractions of the Decays D-s(+) -> u(+)v(u) and D-s(+) -> tau(+)v(tau). By constraining the ratio of Decay rates of Ds(+) to tau(+)v(u) and to u(+)v(u) to the Standard Model prediction, the branching fractions are determined to be B(D-s(+) -> u(+)v(u) = (0.495 +/- 0.067 +/- 0.026)% and B(D-s(+) -> tau(+)v(tau) = (4.83 +/- 0.65 +/- 0.26)% Using these branching fractions, we obtain a value for the Decay Constant f(Ds+) of (241.0 +/- 16.3 +/- 6.5) MeV, where the first error is statistical and the second systematic.
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precision measurements of b d mu nu mu the pseudoscalar Decay Constant fd and the quark mixing matrix element vertical bar v cd vertical bar
Physical Review D, 2014Co-Authors: M Ablikim, M N Achasov, O Albayrak, D J Ambrose, J Z Bai, Baldini R Ferroli, Y Ban, J V Bennett, M BertaniAbstract:We report a measurement of the branching fraction B(D+ -> mu(+)nu(mu)) = [3.71 +/- 0.19(stat) +/- 0.06(sys)] x 10(-4) based on 2.92 fb(-1) of data accumulated at root s = 3.773 GeV with the BESIII detector at the BEPCII collider. This measurement, in conjunction with the Cabibbo-Kobayashi-Maskawa matrix element vertical bar V-cd vertical bar determined from a global Standard Model fit, implies a value for the weak Decay Constant f(D+) = (203.2 +/- 5.3 +/- 1.8) MeV. Additionally, using this branching fraction measurement together with a lattice QCD prediction for f(D+), we find vertical bar V-cd vertical bar 0.2210 +/- 0.0058 +/- 0.0047. In either case, these are the most precise results for these quantities to date.
