NLO QCD corrections to off-shell t(t)over-barW± production at the LHC: correlations and asymmetries

被引：0

作者：

Bevilacqua, Giuseppe ^{[1
]}

Bi, Huan-Yu ^{[2
]}

Hartanto, Heribertus Bayu ^{[3
]}

Kraus, Manfred ^{[4
]}

Nasufi, Jasmina ^{[2
]}

Worek, Malgorzata ^{[2
]}

机构：

[1] Univ Debrecen, MTA DE Particle Phys Res Grp, PBox 105, H-4010 Debrecen, Hungary

[2] Rhein Westfal TH Aachen, Inst Theoret Particle Phys & Cosmol, D-52056 Aachen, Germany

[3] Univ Cambridge, Cavendish Lab, JJ Thomson Ave, Cambridge CB3 0HE, England

[4] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA

来源：

EUROPEAN PHYSICAL JOURNAL C | 2021年 / 81卷 / 07期

基金：

欧洲研究理事会;

关键词：

QUARK PAIR PRODUCTION; PROTON-PROTON COLLISIONS; DOUBLE-REAL RADIATION; CHARGE ASYMMETRY; TOP-QUARK; PP COLLISIONS; FINAL-STATES; ROOT-S=13 TEV; SIGN; SUPERSYMMETRY;

D O I：

10.1140/epjc/s10052-021-09478-x

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：

Recent discrepancies between theoretical predictions and experimental data in multi-lepton plus b-jets analyses for the t (t) over barW(+/-) process, as reported by the ATLAS collaboration, have indicated that more accurate theoretical predictions and high precision observables are needed to constrain numerous new physics scenarios in this channel. To this end we employ NLO QCD computations with full off-shell top quark effects included to provide theoretical predictions for the R=sigma(t (t) over barW)+/sigma(-)(t (t) over barW) cross section ratio at the LHC with root s=13 TeV. Depending on the transverse momentum cut on the b-jet we obtain 2-3% theoretical precision on R, which should help to shed some light on new physics effects that can reveal themselves only once sufficiently precise Standard Model theoretical predictions are available. Furthermore, triggered by these discrepancies we reexamine the charge asymmetry of the top quark and its decay products in the t (t) over barW(+/-) production process. In the case of charge asymmetries, that are uniquely sensitive to the chiral nature of possible new physics in this channel, theoretical uncertainties below 15% are obtained. Additionally, the impact of the top quark decay modelling is scrutinised by explicit comparison with predictions in the narrow-width approximation.

引用

页数：22

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