Effective four-fermion operators in top physics: A roadmap

被引：105

作者：

Aguilar-Saavedra, J. A. ^{[1
,2
]}

机构：

[1] Univ Granada, Dept Fis Teor & Cosmos, E-18071 Granada, Spain

[2] Univ Granada, CAFPE, E-18071 Granada, Spain

来源：

NUCLEAR PHYSICS B | 2011年 / 843卷 / 03期

关键词：

D O I：

10.1016/j.nuclphysb.2010.10.015

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

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)(d) over bar (j,) t -> d(k)e(i)(+) vj, t -> uku(i)(u) over barj, t -> uke(j)(+)e(i)(-), t -> uk (v) over bar (j)v(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 (p) over bar and e(+)e(-) collisions are calculated as well, namely u(i)d(k) -> d(j)t, (d) over bar (j)d(k) -> (u) over bar (i)t, u(i)(d) over bar (j) -> (d) over bar (k)t, u(i)u(k) -> u(j)t, uj (u) over bar (j) -> (u) over bar (k)t,e+e- ->(u) over bar (k)t and the charge conjugate processes. We also compute all top pair production cross sections, (u) over bar (i)u(j) -> t (t) over bar, (d) over bar (i)d(j) -> t (t) over bar u(i)u(j) -> tt and e(+)e(-) -> t (t) over bar. Our results are completely general, without assuming any particular relation among effective operator coefficients. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：638 / 672

页数：35

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