Quasi-two-body decays B → η c (1 S ,2 S ) [ ρ (770), ρ (1450), ρ (1700)→] ππ in the perturbative QCD approach

نویسندگان
چکیده

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

– 1– the Ρ(1450) and the Ρ(1700)

In our 1988 edition, we replaced the ρ(1600) entry with two new ones, the ρ(1450) and the ρ(1700), because there was emerging evidence that the 1600-MeV region actually contains two ρ-like resonances. Erkal [1] had pointed out this possibility with a theoretical analysis on the consistency of 2π and 4π electromagnetic form factors and the ππ scattering length. Donnachie [2], with a full analysi...

متن کامل

THE SEMILEPTONIC DECAYS D → π(ρ)eν AND B → π(ρ)eν FROM QCD SUM RULES

We investigate the semileptonic decays of B and D mesons into π and ρ mesons, respectively, by means of QCD sum rules. We find that for the vector formfactors involved the pole dominance hypothesis is valid to good accuracy with pole masses in the expected range. Pole dominance, however, does not apply to the axial formfactors which results in specific predictions for the predominant polarizati...

متن کامل

Qcd Corrections to ∆ρ*

We discuss a simple method to evaluate the QCD corrections to ∆ρ. It assumes that the perturbative expansion in terms of MS parameters is meaningful and, unlike other studies, exploits significant available information concerning O(ˆ α 2 s) corrections. This approach leads to an enhancement of ∼ 26% relative to the conventional evaluation. QCD corrections to the Z 0 → b ¯ b amplitude are also c...

متن کامل

ρ b D d

Fig. 1 Let ABCD be a circumscribed quadrilateral, that is, a quadrilateral which has an incircle. Let this incircle have the centerO and the radius ρ and touch its sides AB, BC, CD, DA at the points X, Y, Z, W, respectively. Then, for some very obvious reasons, OX ⊥ AB, OY ⊥ BC, OZ ⊥ CD, OW ⊥ DA and OX = OY = OZ = OW = ρ. Moreover, AW = AX, BX = BY, CY = CZ, DZ = DW, since the two tangents from...

متن کامل

The σ and ρ in D and B decays

We study the D → σπ, D → ρπ, B− → σπ−, B− → ρ0π− and B̄ → ρ±π∓ decays in a valence quark triangle model, incorporating chiral symmetries. We find a good agreement with recent experimental data for D → σπ and for D → ρπ. We point out that a long-distance contribution due to the axial vector a1 meson pole, calculated by using chiral symmetry, can be relevant to explain D → ρπ and for lowering the ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Nuclear Physics B

سال: 2017

ISSN: 0550-3213

DOI: 10.1016/j.nuclphysb.2017.10.003