ATLAS sensitivity to Wtb anomalous couplings in top quark decays

被引：51

作者：

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

Carvalho, J. ^{[3
]}

Castro, N. ^{[3
]}

Onofre, A. ^{[3
]}

Veloso, F. ^{[3
]}

机构：

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

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

[3] Univ Coimbra, Dept Fis, LIP, P-3004516 Coimbra, Portugal

来源：

EUROPEAN PHYSICAL JOURNAL C | 2008年 / 53卷 / 04期

关键词：

D O I：

10.1140/epjc/s10052-007-0519-9

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 study the sensitivity of the ATLAS experiment to Wtb anomalous couplings in top pair production with semileptonic decay, pp -> t (t) over bar -> W(+)bW(-)(b) over bar with one of the W bosons decaying leptonically and the other hadronically. Several observables are examined, including the W helicity fractions and new quantities recently introduced, such as the ratios of helicity fractions and some angular asymmetries defined in the W rest frame. The dependence on anomalous couplings of all these observables has been previously obtained. In this work we show that some of the new observables also have smaller systematic uncertainties than the helicity fractions, with a similar or stronger dependence on anomalous couplings. Consequently, their measurement can significantly improve the limits on anomalous couplings. Moreover, the most sensitive measurements can be combined. In this case, the precision achieved in the determination of Wtb anomalous couplings can be of a few percent in the semileptonic channel alone.

引用

页码：689 / 699

页数：11

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