Nucleon’s energy–momentum tensor form factors in light-cone QCD

Improved approach to the heavy - to - light form factors in the light - cone QCD sum rules ∗

A systematic analysis shows that the main uncertainties in the form factors are due to the twist-3 wave functions of the light mesons in the light-cone QCD sum rules. We propose an improved approach, in which the twist-3 wave functions doesn’t make any contribution and therefore the possible pollution by them can be avoided, to re-examine B → π semileptonic form factors. Also, a comparison betw...

Electromagnetic form factors of the ρ meson in light cone QCD sum rules

We investigate the electromagnetic form factors of the ρ meson in light cone QCD sum rules. We find that the ratio of the magnetic and charge form factors is larger than two at all values of Q2, (Q2 ≥ 0.5 GeV 2). The values of the individual form factors at fixed values of Q2 predicted by the light cone QCD sum rules are quite different compared to the results of other approaches. These results...

Light-cone expansion of heavy-to-light form factors

We present the results of our recent systematic study of the light-cone expansion of heavy-to-light transition form factors in a model with scalar constituents [1]. We show that the higher-twist contributions (represented in this model by off-light-cone effects) all have the same behaviour in the 1/mQ expansion. The suppression parameter of the higher-twist contributions compared to the lower-t...

Weak Decay Form Factors from QCD Sum Rules on the Light-Cone

Form factors of B to light meson transitions are not only needed for the extraction of |Vub| from B → πeν or B → ρeν and |Vts| and |Vtd | from B → Kγ and B → ργ, respectively (provided there is no new physics in these decays), but they also enter most prominently the calculation of B → charmless nonleptonic decays in BBNS factorisation [ 1]. It is hence of eminent importance to calculate them a...

7 Analysis of the Σ − n form - factors with light - cone QCD sum rules