Nonrelativistic effective field theory of unstable top
Abstract
We develop a new nonrelativistic effective field theory of $\rho$NRQCD [1] to describe the finite lifetime effects in the threshold production of top quark-antiquark pairs. The theory is based on the expansion in a parameter $\rho=1-m_W/m_t$ characterizing the dynamics of the top-quark decay. Within this framework we compute the nonresonant contribution to the total cross section of the top quark-antiquark threshold production in electron-positron annihilation up to the next-to-next-to-leading order. Our method naturally resolves the problem of spurious divergences in the analysis of the unstable top production.
- Publication:
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arXiv e-prints
- Pub Date:
- September 2012
- DOI:
- 10.48550/arXiv.1209.3821
- arXiv:
- arXiv:1209.3821
- Bibcode:
- 2012arXiv1209.3821P
- Keywords:
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- High Energy Physics - Phenomenology
- E-Print:
- 9 pages, 4 figures, talk given at the conference "Loops and Legs in Quantum Field Theory", Wernigerode, Germany, 15-20 April 2012