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14 papers · 2 filters
Effective theory approach to unstable particle production
M. Beneke, A. P. Chapovsky, A. Signer +1
Using the hierarchy of scales between the mass, , and the width, , of a heavy, unstable particle we construct an effective theory that allows calculations for resonant proces…
Factorization of heavy-to-light form factors in soft-collinear effective theory
M. Beneke, Th. Feldmann
Heavy-to-light transition form factors at large recoil energy of the light meson have been conjectured to obey a factorization formula, where the set of form factors is reduced to…
Predictions for top quark spin correlations at the Tevatron and the LHC at next-to-leading order in alpha_s
A. Brandenburg
Predictions for angular distributions of top quark decay products that are sensitive to t tbar spin correlations are presented at next-to-leading order in alpha_s for the Tevatron…
The possibility of a sizable, direct CP-violating asymmetry in B^-+ -> K^-+ eta
Saul Barshay, Georg Kreyerhoff
The likelihood of a sizable, direct CP-violating asymmetry in the decays , is calculated within the framework of the model which originally predicted a sizeable as…
Spectator interactions and factorization in B -> pi ell nu decay
M. Beneke, Th. Feldmann
We investigate the factorization of different momentum modes that appear in matrix elements for exclusive B meson decays into light energetic particles for the specific case of B -…
Semileptonic decays of polarised top quarks: V + A admixture and QCD corrections
Werner Bernreuther, Michael Fuecker, Yoshiaki Umeda
The semileptonic decays of polarised top quarks are analysed for a general chirality-conserving tbW vertex. We calculate double differential distributions for the charged lepton an…