#### Filter Results:

- Full text PDF available (7)

#### Publication Year

1999

2008

- This year (0)
- Last 5 years (0)
- Last 10 years (6)

#### Publication Type

#### Co-author

#### Journals and Conferences

Learn More

- Andrzej Czarnecki, Maciej Ślusarczyk, Fyodor V. Tkachov
- Physical review letters
- 2006

A class of previously unknown strong-interaction corrections is found to enhance the rate of nonleptonic decays of the quark by 5%-8%. This effect decreases the predicted fraction of semileptonic decays and brings it into fair agreement with experimental results. As well as solving a long-standing puzzle of measurements disagreeing with the standard model… (More)

Domain wall type solution with oscillating thickness in a real, scalar field model is investigated with the help of a polynomial approximation. We propose a simple extension of the polynomial approximation method. In this approach we calculate higher order corrections to the planar domain wall solution, find that the domain wall with oscillating thickness… (More)

The (2+1) dimensional non-linear electrodynamics, the so called Pagels–Tomboulis electrodynamics, with the Chern–Simons term is considered. We obtain ”generalized self–dual equation” and find the corresponding generalized massive Chern–Simons Lagrangian. Similar results for (2+1) massive dilaton electrodynamics have been obtained. 1 The Pagels–Tomboulis… (More)

We discuss a model with a massless scalar coupling to the YangMills SU(2) gauge field in four-dimensional space-time. The solutions from static, pointlike colour source are given. There exists not only solutions with finite energy but also singular one which describes confinement. The confining potential depends on the δ parameter of our model. The regular… (More)

- Ian Blokland, Andrzej Czarnecki, Maciej Ślusarczyk, Fyodor V. Tkachov
- Physical review letters
- 2004

We present a determination of a new class of three-loop Feynman diagrams describing heavy-to-light transitions. We apply it to find the O(alpha2(s)) corrections to the top quark decay t --> bW and to the distribution of lepton invariant mass in the semileptonic b quark decay b --> ulnu. We also confirm the previously determined total rate of that process as… (More)

SU(2) Yang-Mills theory coupled in a non-minimal way to two scalar fields is discussed. For the massless scalar fields a family of finite energy solutions generated by an external, static electric charge is found. Additionally, there is a single solution which can be interpreted as confining one. Similar solutions have been obtained in the magnetic sector.… (More)

It is well-known that the top quark is the heaviest fermion in the Standard Model. An immediate consequence of that fact is its very short lifetime which turns out to be shorter than the characteristic timescale of nonperturbative QCD effects. Thanks to this feature, the top behaves almost like a free quark, which is really a unique situation in QCD.… (More)

A generalized Dick model with a potential term is discussed. The solution originating from a static, pointlike, color source is found to have a confining part. The comparison with a wide spectrum of phenomenological quark-antiquark potentials is presented.

Generalization of QCD motivated classical SU(2) Yang–Mills theory coupled to the scalar field is discussed. The massive scalar field, corresponding the scalar glueball, provides a confining potential for static, point–like, external sources. In case of massless scalar field screening solutions are found. However, there is a confining sector as well. Both,… (More)

- Mikołaj Misiak, Hrachia M. Asatrian, +14 authors Matthias Steinhauser
- Physical review letters
- 2007

Combining our results for various O(alpha[s]) corrections to the weak radiative B-meson decay, we are able to present the first estimate of the branching ratio at the next-to-next-to-leading order in QCD. We find B(B[over ]-->X[s]gamma)=(3.15+/-0.23) x 10(-4) for Egamma>1.6 GeV in the B[over ]-meson rest frame. The four types of… (More)

- ‹
- 1
- ›