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Showing 1 to 20 of 38 for “"sum rule"”.
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Perturbative Check of the Action and Energy Lattice Sum Rules
Lattice sum rules are checked using lattice perturbation theory. The action sum rule gives a relation between the quark-antiquark potential, its logarithmic derivative with respect to distance and the expectation value of the action; the energy sum rule expresses the potential as the sum of the …
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Optical excitations in cold gases
… of some of the broadening effects. We derive a sum rule for the average frequency shift of an optical spectrum and investigate the basic conservation laws and symmetries of the system lying at the basis of this sum rule. We also compare the sum rule for the optical spectrum with the f-sum rule …
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Measurement of Generalized GDH Integrand for the Neutron and 3He at Low Q2
… in the non-perturbative regime. Dispersive sum rules, based on universal principles, provide a data-driven approach to study the nucleon structure without model-dependencies. Among those sum rules, the well known Gerasimov-Drell-Hearn (GDH) sum rule relates the anomalous magnetic moment to a …
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Electromagnetic pion form factor at finite temperature
… Fπ(Q²,T), is obtained from a Finite Energy QCD Sum Rule. The form factor decreases with increasing T, and vanishes at some critical temperature, where the pion radius diverges, thus signalling quark deconfinement.
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Giant resonances in lead-208 measured by electron scattering with coincident neutrons
… (107~32)% of an isoscalar E2 energy weighted sum rule, and the measured strength in the region from 12.5 MeV to 16.0 MeV exhausts (94~28)% of an isoscalar EO energy weighted sum rule.
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A study of Gamow-teller strength using the 208Pb(p,n) and 181Ta(p,n) reactions at intermediate energy, Ep=122 MeV
… and ¹⁸¹Ta(p,n)¹⁸¹W reactions was found by summing the individual GT strength in the 0 - 23 MeV and 0 - 20 MeV excitation regions respectively. The ΣB(GT) strength associated with the ²⁰⁸Pb(p,n)²⁰⁸Bi and ¹⁸¹Ta(p,n)¹⁸¹W reactions were found to be less than the values predicted by the 3(N - Z) …
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Beyond particles and localities in quantum matters
… life-time, the violation of the conductivity sum rule, and the appearance of the anomalous dimension for the current. Our results suggest that the correct description of the low-energy theory of the normal state of the cuprates could involve unparticles and nonlocal actions.
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Perturbative QCD in exclusive processes
… for the cross-section for 𝛾𝛾 → Δ++ Δ̅++ with sum-rule wave functions is presented. As a product of the development of the computer program, the quark amplitudes for meson-baryon scattering are obtained. Integrations of the quark amplitudes over wave functions are carried out by cutting off …
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Compton scattering from the proton below pion threshold: A measurement of the electric and magnetic polarizabilities of the proton
… $\bar \alpha$. Using the model independent sum rule constraint for $\bar \alpha$ + $\bar \beta$ and a model dependent dispersion relation calculation, the values for the polarizabilities extracted from the cross sections are:$$\bar \alpha = (12.5 \pm 0.6 \pm 0.8 \pm 0.6) \times 10\sp{-4} …
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Measurement of the isovector giant quadrupole resonance in 208Pb using eleastic polarized photon scattering
… an energy weighted strength of 1.4±0.3 isovector sum rule units.
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New Tools In The Search For Supersymmetry
… supersymmetry. Lastly, we use the SUSY-Yukawa sum rule to look beyond the phenomenology and probe the crucial cancellation of divergences at the heart of supersymmetric theories.
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Precision Measurement of the Spin Structure of the Proton and the Deuteron
… data, give improved results for the Bjorken sum rule and the quark spins. The gluon contribution to the nucleon spin is confirmed to be significant.</p>
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Field Theory of Mottness
… including the nonvanishing of the restricted f-sum rule in the Mott insulator, (2) the T2 contribution to the thermal conductivity, (3) pseudogap, (4) bifurcation of the electron spectrum below the chemical potential, as recently seen in angle-resolved photoemission, (5) insulating behavior away …
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PRECISION MEASUREMENT OF QUASI-ELASTIC TRANSVERSE AND LONGITUDINAL RESPONSE FUNCTIONS IN THE RANGE 0.55 GeV/cj <q <1.0 GeV/c
The Coulomb Sum is defined by the quasi-elastic nucleon knock-out process and it is the integration of the longitudinal response function over the energy loss of the incident electron. The Coulomb sum goes to the total charge at large q. The existing measurements of the Coulomb Sum Rule show …
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The (p, n) charge-exchange reaction on ⁹⁰Zr at intermediate energies
… were extracted from the time spectra. The sum of the strength of all the discrete Gamow-Teller states was determined and compared to the Ikeda Sum Rule. It was found that only 50% of the sum could be accounted for in the discrete states. An overview of the theory that has been developed to …
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Data fusion based optimal EEG electrode selection for early diagnosis of Alzheimer's disease
… then combined using combination methods such as sum rule, product rule, simple and weighted majority voting.</p> <p>Classification performance for Cohort A was 88.7%, an increase of more than 5% over previous work in this study. Classification performance for Cohort B was 93.6% and the …
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UNRAVELING THE NUCLEON 3D STRUCTURE FROM EXPERIMENT, LATTICE, AND GLOBAL ANALYSIS
… structures and derive a new twist-3 partonic sum rule for the transverse spin of the proton, which involves the well-known quark spin structure function $g_T(x)$, the less-studied but known transverse gluon polarization density $\Delta G_T(x)$, and quark and gluon canonical orbital angular …
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The far-ultraviolet spectroscopy of molecules of astrophysical interest
… and C$_{2}$H$_{2}$ using the Thomas-Reiche-Kuhn Sum Rule. A possible Rydberg series of OH was observed, converging to a first ionisation potential of 13.36 eV and a likely inner shell two-electron resonance detected in the ionisation continuum of D$_{2}$O at 415$\AA$. Both a synchrotron and a …
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Método atômico para o modelo de Anderson em presença de um campo magnético externo.
… consistently in a way that a generalized Friedel sum rule, that takes into account the magnetic field ~B, must be satisfied. The calculation of the parameters mentioned above allow us to obtain the approximate GF of the impurity Anderson model, and the spectral densities depending on the magnetic …
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Data fusion of complementary information from parietal and occipital event related potentials for early diagnosis of Alzheimer's disease
… through the weighted majority vote, product and sum rule combination schemes. The results indicate that a correct diagnosis performance of over 80% can be obtained by combining data primarily from parietal and occipital lobe electrodes. The performance significantly exceeds that reported from …
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