منابع مشابه
Semi-inclusive decays Λb → Xc + (Ds, D ∗ s) at O(αs) including Λb and D ∗ s polarization effects
متن کامل
Semi-inclusive decays Λb → Xc + (Ds, D ∗ s) at O(αs) including Λb and D ∗ s polarization effects
متن کامل
Photon polarization from helicity suppression in radiative decays of polarized Λb to spin-3/2 baryons
We give a general parameterization of the Λb → Λ(1520)γ decay amplitude, applicable to any strange isosinglet spin-3/2 baryon, and calculate the branching fraction and helicity amplitudes. Large-energy form factor relations are worked out, and it is shown that the helicity-3/2 amplitudes vanish at lowest order in soft-collinear effective theory (SCET). The suppression can be tested experimental...
متن کاملColor-octet heavy quarkonium productions in Z decays at LEP
We consider the energy and the polar angle distributions of J/ψ’s produced via the color-singlet and the color-octet (3S (8) 1 ) mechanisms in Z 0 → J/ψ+X at LEP. Since both distributions of the J/ψ produced via color-octet mechanism are significantly different from those via color-singlet mechanism, these observables can be used as tests of color-octet production mechanism for heavy quarkonia....
متن کاملAxial Anomaly Effects in Pion and Z0 Radiative Decays
We discuss a connection between axial anomaly and polarized radiative processes. By comparison with the corresponding unpolarized cases, we consider some physical outputs for the π+ and Z0 polarized radiative decays. We analyse in detail the pattern of mass singularity cancellation. PACS 11.30.Rd, 13.20.Cz, 11.15.Bt
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2000
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(99)01431-8