منابع مشابه
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We study the high energy, fixed angle, asymptotics of D-brane form factors to all orders in string perturbation theory, using the Gross-Mende saddle point techniques. The effective interaction size of all D-branes grows linearly with the energy as αE/n, where n is the order of perturbation theory, except for the D-instanton, whose form factor is dominated by end-point contributions, and remains...
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We argue that the Large Energy Effective Theory (LEET), originally proposed by Dugan and Grinstein, is applicable to exclusive semileptonic, radiative and rare heavy-to-light transitions in the region where the energy release E is large compared to the strong interaction scale and to the mass of the final hadron, i.e. for q2 not close to the zero-recoil point. We derive the Effective Lagrangian...
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Making use of the measurement of the B → K∗γ branching ratio together with the relations following from the limit of high recoil energy, we obtain stringent constraints on the values of the form-factors entering in heavy-to-light B → V ll′ processes such as B → K∗l+l−, B → K∗νν̄ and B → ρlν decays. We show that the symmetry predictions, when combined with the experimental information on radiativ...
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We calculate electric and magnetic form factors of protons and neutrons in quenched Monte Carlo lattice QCD on a 163 × 24 lattice at β = 6.0 using Wilson fermions. We employ a method which characterizes one of the nucleon fields as a fixed zero-momentum secondary source. Extrapolating the overall data set to the chiral limit, we find acceptable fits for either dipole or monopole forms and extra...
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ژورنال
عنوان ژورنال: Physical Review
سال: 1960
ISSN: 0031-899X
DOI: 10.1103/physrev.119.463