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The Decay Constant
, 1999
"... is the Noether current of the spontaneously broken global symmetry. An axion gives a natural solution to the strong CP problem: why the effective `parameter in the QCD Lagrangian L ` = CITATION: C. Caso et al., The European Physical Journal C3, 1 (1998) and 1999 offyear partial update for the 200 ..."
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is the Noether current of the spontaneously broken global symmetry. An axion gives a natural solution to the strong CP problem: why the effective `parameter in the QCD Lagrangian L ` = CITATION: C. Caso et al., The European Physical Journal C3, 1 (1998) and 1999 offyear partial update for the 2000 edition (URL: http://pdg.lbl.gov/) October 19, 1999 11:12  2 ` eff ff s 8 F a e F a is so small (` eff . 10 \Gamma9 ) as required by the current limits on the neutron electric dipole moment, even though ` eff O(1) is perfectly allowed by the QCD gauge invariance. Here, ` eff is the effective ` parameter after the diagonalization of the quark masses, and F<F8.352
Pion decay constants in Dense
"... Abstract. According to the QCD, the hadronic matter can have various phases with matter density and temperature. In general, when there is phase transition in a matter, it is known that a symmetry in the matter changes. In case of the hadronic matter, the chiral symmetry in the matter is expected t ..."
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to be restored when the matter density (or temperature) increases. The actual order parameter with respect to the chiral symmetry in the hadronic matter is known as the quark condensate from the QCD, but the pion decay constant, corresponding to the radius of the chiral circle, plays the role of the order
Decay Constants fD ∗ s
, 1998
"... We calculate the decay constant of Ds and D ∗ s with ¯ B 0 → D + ℓ − ν and ¯ B 0 → D + D −(∗) s decays. In our analysis we assume the factorization ansatz and use two different form factor behaviours (constant and monopoletype) for F0(q 2). We also consider the QCDpenguin contributions in hadronic ..."
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We calculate the decay constant of Ds and D ∗ s with ¯ B 0 → D + ℓ − ν and ¯ B 0 → D + D −(∗) s decays. In our analysis we assume the factorization ansatz and use two different form factor behaviours (constant and monopoletype) for F0(q 2). We also consider the QCDpenguin contributions in hadronic
Mixing and Decay Constants
, 1998
"... We propose a new η–η ′ mixing scheme where we start from the quark flavor basis and assume that the decay constants in that basis follow the pattern of particle state mixing. On exploiting the divergences of the axial vector currents – which embody the axial vector anomaly – all basic parameters are ..."
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We propose a new η–η ′ mixing scheme where we start from the quark flavor basis and assume that the decay constants in that basis follow the pattern of particle state mixing. On exploiting the divergences of the axial vector currents – which embody the axial vector anomaly – all basic parameters
On the possibility of large axion decay constants
 JCAP
, 2003
"... The decay constant of the QCD axion is required by observation to be small compared to the Planck scale. In theories of “natural inflation, ” and certain proposed anthropic solutions of the cosmological constant problem, it would be interesting to obtain a large decay constant for axionlike fields ..."
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Cited by 29 (2 self)
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The decay constant of the QCD axion is required by observation to be small compared to the Planck scale. In theories of “natural inflation, ” and certain proposed anthropic solutions of the cosmological constant problem, it would be interesting to obtain a large decay constant for axionlike fields
Chiral behaviour of the pion decay constant
 in Nf = 2 QCD, PoS LAT2013
, 2013
"... for the ALPHA Collaboration As increased statistics and new ensembles with light pions have become available within the CLS effort, we complete previous work by inspecting the chiral behaviour of the pion decay constant. We discuss the validity of Chiral Perturbation Theory (χPT) and examine the res ..."
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Cited by 4 (0 self)
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for the ALPHA Collaboration As increased statistics and new ensembles with light pions have become available within the CLS effort, we complete previous work by inspecting the chiral behaviour of the pion decay constant. We discuss the validity of Chiral Perturbation Theory (χPT) and examine
Pseudoscalar decay constants at large Nc
"... In the large Nc limit, the variables required to analyze the low energy structure of QCD in the framework of an effective field theory necessarily include the degrees of freedom of the η ′. We evaluate the decay constants of the pseudoscalar nonet to one loop within this extended framework and show ..."
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Cited by 16 (0 self)
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In the large Nc limit, the variables required to analyze the low energy structure of QCD in the framework of an effective field theory necessarily include the degrees of freedom of the η ′. We evaluate the decay constants of the pseudoscalar nonet to one loop within this extended framework and show
Electromagnetic corrections to pseudoscalar decay constants
, 2011
"... The effects of electromagnetic interactions on pseudoscalar decay constants are investigated. Using a compact QED and QCD action we are able to resolve differences of about 0.1 MeV. We obtain the preliminary results fpi0 − fpi ± = 0.09(3) MeV and fD0 − fD ± = 0.79(11) MeV for light and charmed p ..."
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Cited by 1 (0 self)
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The effects of electromagnetic interactions on pseudoscalar decay constants are investigated. Using a compact QED and QCD action we are able to resolve differences of about 0.1 MeV. We obtain the preliminary results fpi0 − fpi ± = 0.09(3) MeV and fD0 − fD ± = 0.79(11) MeV for light and charmed
Results 1  10
of
4,533