Threshold resummed spectra in B{yields}X{sub u}l{nu} decays in NLO. II
- Dipartimento di Fisica, Universita di Roma I 'La Sapienza', and I.N.F.N., Sezione di Roma (Italy)
- Dipartimento di Scienze Fisiche, Universita di Napoli 'Federico II' and I.N.F.N., Sezione di Napoli (Italy)
We resum to next-to-leading order the distribution in the ratio of the invariant hadron mass m{sub X} to the total hadron energy E{sub X} and the distribution in m{sub X} in the semileptonic decays B{yields}X{sub u}l{nu}. By expanding our formulas, we obtain the coefficients of all the infrared logarithms at O({alpha}{sub S}{sup 2}) and of the leading ones at O({alpha}{sub S}{sup 3}). We explicitly show that the relation between these semileptonic spectra and the photon spectrum in the radiative decay B{yields}X{sub s}{gamma} is not a purely short-distance one. There are long-distance effects in the semileptonic spectra which are not completely factorized by the structure function as measured in the radiative decay and have to be modeled in some way.
- OSTI ID:
- 20869237
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 74, Issue 3; Other Information: DOI: 10.1103/PhysRevD.74.034005; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
Similar Records
Threshold resummed spectra in B{yields}X{sub u}l{nu} decays in NLO. I
High order perturbative corrections to the determination of |V{sub ub}| from the P{sub +} spectrum in B{yields}X{sub u}l{nu}{sub l}