Effective four-fermion operators in top physics: a roadmap
arXiv:1008.3562 · doi:10.1016/j.nuclphysb.2010.10.015 10.1016/j.nuclphysb.2011.06.003
Abstract
We write down a minimal basis for dimension-six gauge-invariant four-fermion operators, with some operator replacements with respect to previous ones which make it simpler for calculations. Using this basis we classify all four-fermion operator contributions involving one or two top quarks. Taking into account the different fermion chiralities, possible colour contractions and independent flavour combinations, a total number of 572 gauge-invariant operators are involved. We apply this to calculate all three-body top decay widths t -> d_k u_i dbar_j, t -> d_k e_i+ nu_j, t -> u_k u_i ubar_j, t -> u_k e_j+ e_i-, t -> u_k nu_j nu_i (with i,j,k generation indices) mediated by dimension-six four-fermion operators, including the interference with the Standard Model amplitudes when present. All single top production cross sections in pp, p pbar and e+ e- collisions are calculated as well, namely u_i d_k -> d_j t, dbar_j d_k -> ubar_i t, u_i dbar_j -> dbar_k t, u_i u_k -> u_j t, u_i ubar_j -> ubar_k t, e+ e- -> ubar_k t and the charge conjugate processes. We also compute all top pair production cross sections, ubar_i u_j -> t tbar, dbar_i d_j -> t tbar, u_i u_j -> t t and e+ e- -> t tbar. Our results are completely general, without assuming any particular relation among effective operator coefficients.
LaTeX 43 pages, 1 PS figure. Cross sections for uu,cc -> tt corrected
References in corpus (4)
Cited by in corpus (6)
- Probing the Tevatron t tbar asymmetry at LHC
- Top Quark Forward-Backward Asymmetry and Same-Sign Top Quark Pairs
- No like-sign tops at Tevatron: Constraints on extended models and implications for the t tbar asymmetry
- Single top quark production and decay in the t-channel at next-to-leading order at the LHC
- Constraints on the Wtb vertex from early LHC data
- Using single top rapidity to measure V_td, V_ts, V_tb at hadron colliders