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— | preprints:1995:ttp95-26 [2016/03/17 11:03] (current) – created - external edit 127.0.0.1 |
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| ====== TTP95-26 ANGULAR DISTRIBUTIONS OF MASSIVE QUARKS AND LEPTONS CLOSE TO THRESHOLD ====== |
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| <hidden TTP95-26 ANGULAR DISTRIBUTIONS OF MASSIVE QUARKS AND LEPTONS CLOSE TO THRESHOLD > Predictions for the angular distribution of massive quarks and |
| leptons are presented, including QCD and QED corrections. Recent |
| results for the fermionic part of the two-loop corrections to the |
| electromagnetic form factors are combined with the BLM scale fixing |
| prescription. Two distinctly different scales arise as arguments of |
| $\alpha_s(\mu^2)$ near threshold: the relative momentum of the |
| quarks governing the soft gluon exchange responsible for the Coulomb |
| potential, and a large momentum scale approximately equal to twice |
| the quark mass for the corrections induced by transverse gluons. |
| Numerical predictions for charmed, bottom, and top quarks are given. |
| One obtains a direct determination of $\alpha_{\mbox{\it\scriptsize |
| V}}(Q^2)$, the coupling in the heavy quark potential, which can be |
| compared with lattice gauge theory predictions. The corresponding |
| QED results for $\tau$ pair production allow for a measurement of |
| the magnetic moment of the $\tau$ and could be tested at a future |
| $\tau$-charm factory. |
| </hidden> |
| |**S.J. Brodsky, A.H. Hoang, J.H. K\"uhn and T. Teubner,** | |
| |** Phys. Lett. B359 355-361 1995 ** | |
| | {{preprints:1995:ttp95-26.pdf|PDF}} {{preprints:1995:ttp95-26.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/9508274|arXiv]] | |
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