singular f-sum ruleanharmonic crystalsBose liquids/ A6740D Quantum statistical theoryground state, elementary excitations (liquid helium-4)The validity and applicability to inelastic neutron scattering of a singular f-sum rule for superfluid helium, proposed by Griffin to explain the s dependence in ...
We derive the contribution of each component to the f-sum rule. The single quasiparticle contribution is proportional to the condensate function n0(T) at all wave vectors Q. This simple sum rule is analogous to the Ambegaokar, Conway, and Baym sum rule giving the one-phonon contribution to...
摘要: In the zero momentum transfer limit the conditions for finite electronic Raman intensity are presented. The right hand side of the generalized f-sum rule is calculated, where in the dynamical structure factor the electron density is replaced by an effective density describing the light scatter...
什么是 f-Sum Rule 以及 Kohn Theorem，以及二者有无关联？众所周知，f-Sum Rule 是 Ward Identity...
Further, estimates of fi”’ in the framework of QCD sum rules and in lattice computations are in agreement with each other and result in [ 11 fi? = 240 & 40 MeV . (2) The sum rule estimation of the average heavy quark momentum squared inside the meson gives the value [IS,91 &=...
The Borel mass is fixed by the rule of thumb that the contribution from high dimension condensate terms is no larger than twenty percents in the truncated OPE, and simultanously the contribution from excited and continuum states is smaller than thirty percents when summing up the hadrons. The...
Gottfried sum rule and the shape of F {2/}- F {2/} The recent experimental determination of the Gottfried sum rule of deep inelastic scattering provides strong evidence that SU(2) flavor symmetry is broken ... W Melnitchouk,AW Thomas,AI Signal - 《Zeitschrift Für Physik A Hadrons & ...
The recent experimental determination of the Gottfried sum rule of deep inelastic scattering provides strong evidence that SU(2) flavor symmetry is broken by the sea quark distributions of the nucleon. Two mechanisms have been suggested to explain the data: Pauli blocking and non-perturbative contribu...
而且很多行为规范都需要小朋友共同来遵守当中的rule (法则),如果某一方小朋友破坏了这个rule,另一方小朋友就算坚守这个rule,法则本身也失去了存在的意义。加上小孩子遇事缺乏对愤怒的控制能力,当一方小朋友不遵循rule的时候,另一方很容易被激怒,头脑发热冲动起来。,。。。所以这个时候,告诉小乖的不仅仅是怎样做是道理...
The QCD sum rule (QCDSR) of the neutral scalar coupling is quoted as \begin{aligned}{} & {} m_S^2 {{\bar{f}}}_S^2(\mu ) e^{- m_S^2/M^2} = I_0^{\textrm{pert}}(s_0,M^2) + \langle {\bar{q}}q \rangle I_0^{\langle {\bar{q}}q \rangle }(M^2) \nonumbe...