Zobrazeno 1 - 10
of 52
pro vyhledávání: '"Th. Feldmann"'
Autor:
G. Bell, Th. Feldmann
Publikováno v:
Nuclear Physics B - Proceedings Supplements. 164:189-192
We investigate transition form factors between non-relativistic QCD bound states at large recoil energy. Assuming the decaying quark to be much heavier than its decay product, the relativistic dynamics can be treated according to the factorization fo
Publikováno v:
The European Physical Journal C. 41:173-188
We provide Standard Model expectations for the rare radiative decays B->K^* gamma, B->rho gamma and B-> omega gamma, and the electroweak penguin decays B->K^* l^+ l^- and B->rho l^+ l^- at the next-to-leading order (NLO), extending our previous resul
Publikováno v:
Nuclear Physics B. 612:25-58
We show — by explicit computation of first-order corrections — that the QCD factorization approach previously applied to hadronic two-body decays and to form factor ratios also allows us to compute non-factorizable corrections to exclusive, radia
Autor:
Th. Feldmann
Publikováno v:
Nuclear Physics B - Proceedings Supplements. 93:99-102
Recently it has been shown that in the large-recoil limit new symmetries emerge which impose various relations on form factors that parametrise the decay of heavy B mesons into light mesons. These symmetry relations are broken by radiative QCD correc
Publikováno v:
Nuclear Physics B. 596:33-65
Within the framework of light-cone quantisation we derive the complete and exact overlap representation of skewed parton distributions for unpolarised and polarised quarks and gluons. Symmetry properties and phenomenological applications are discusse
Autor:
M. Beneke, Th. Feldmann
Publikováno v:
Nuclear Physics B. 592:3-34
Recently it has been shown that symmetries emerging in the heavy quark and large recoil energy limit impose various relations on form factors that parametrise the decay of B mesons into light mesons. These symmetries are broken by perturbative effect
Autor:
Th. Feldmann
Publikováno v:
Nuclear Physics B - Proceedings Supplements. 82:331-336
I discuss the progress in our theoretical understanding of the eta-gamma and eta'-gamma transition form factors, including the recent data from CLEO and L3 at large momentum transfer, Q^2. The experimental data above Q^2=1 GeV^2 can be well described
Publikováno v:
The European Physical Journal C. 8:409-434
We relate ordinary and skewed parton distributions to soft overlap contributions to elastic form factors and large angle Compton scattering, using light-cone wave functions in a Fock state expansion of the nucleon. With a simple ansatz for the wave f
Publikováno v:
Physics Letters B. 449:339-346
We present further tests and applications of the new eta-eta' mixing scheme recently proposed by us. The particle states are decomposed into orthonormal basis vectors in a light-cone Fock representation. Because of flavor symmetry breaking the mixing
Publikováno v:
International Journal of Modern Physics A. 12:4399-4409
Using present data for the decays f0 → γγ, f0 → ππ, we determine the mixing angle of scalar mesons in a chiral quark σ-model. This value is employed for an analysis of the kaon polarizability. It is shown that pole diagrams from intermediate