Next-to-leading order corrections to single top quark production and decay at the Fermilab Tevatron:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>s</mml:mi></mml:math>-channel process

Cao, Qing-Hong; Schwienhorst, R.; Yuan, C. P.

doi:10.1103/physrevd.71.054023

Cited by 93 publications

(80 citation statements)

References 65 publications

(48 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The QCD NLO corrections can be factorized into two independent gauge invariant parts, i.e., KK graviton produced at the NLO with a subsequent decay at the LO, and produced at the LO with a subsequent decay at the NLO, similar to the cases of Refs. [22,23].…”

Section: Analytical Resultsmentioning

confidence: 99%

“…[23], by expanding the cross section to O(α s ) and discarding terms of order O(α 2 s ) or higher, we can write the differential cross sections as,…”

Section: Consistent Treatment Of Kk Graviton Decay In Perturbation Thmentioning

confidence: 99%

“…In the narrow width approximation (NWA) [23], the production cross section for a specific decay channel is given by the total cross section times the branching fraction of the decay channel, which requires a consistent treatment of the decay at the NLO. For the BreitWigner resonance there is a similar procedure.…”

Section: Consistent Treatment Of Kk Graviton Decay In Perturbation Thmentioning

confidence: 99%

See 2 more Smart Citations

Constraints on Randall-Sundrum model from the events of dijet production with QCD next-to-leading order accuracy at the LHC

et al. 2015

Phys. Rev. D

View full text Add to dashboard Cite

We study the dijet production in Randall-Sundrum model at the LHC with QCD next-toleading(NLO) order accuracy. Our results show that the QCD NLO corrections can increase the total cross sections by more than 80% and reduce the scale dependence. We also explore in detail several important kinematic distributions at the NLO level. Moreover, we discuss the upper limits of the KK graviton excluded mass range and the allowed parameter space for the coupling constant and KK graviton mass, using the experiment data.

show abstract

Section: Analytical Resultsmentioning

confidence: 99%

“…[23], by expanding the cross section to O(α s ) and discarding terms of order O(α 2 s ) or higher, we can write the differential cross sections as,…”

Section: Consistent Treatment Of Kk Graviton Decay In Perturbation Thmentioning

confidence: 99%

Section: Consistent Treatment Of Kk Graviton Decay In Perturbation Thmentioning

confidence: 99%

See 1 more Smart Citation

Constraints on Randall-Sundrum model from the events of dijet production with QCD next-to-leading order accuracy at the LHC

et al. 2015

Phys. Rev. D

View full text Add to dashboard Cite

show abstract

“…The indirect determination assumes three generations and unitarity. From top pair production at the Tevatron one knows For all single top production channels fixed-order NLO calculations are available [92][93][94][95][96][97][98][99][100][101][102][103][104][105]. In addition resummation at the NNLL level has been carried out [106][107][108].…”

Section: Single Top Productionmentioning

confidence: 99%

Theoretical overview on top pair production and single top production

Weinzierl

2012

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. In this talk I will give an overview on theoretical aspects of top quark physics. The focus lies on top pair production and single top production. Basic facts about the top quarkThe top quark is the heaviest elementary particle known up to today. It has been discovered at the Tevatron and it is currently studied at the LHC. The top quark can be characterised by three essential numbers. These are the top quark mass, the top quark width and the branching ratio for the decay into a bottom quark. The current experimentally measured values are [1]The first number tells us that the top quark is heavier than all other known elementary particles, from the second one we deduce that the lifetime of the top quark is shorter than the characteristic hadronisation time scale. The third number indicates that the top quark decays predominately into a bottom quark and a W-boson. These numbers have several implications: The top quark mass is close to the electroweak symmetry breaking scale v = 246 GeV. If there is new physics associated with electro-weak symmetry breaking, top quark physics is a place to look for. Secondly, the large top mass sets a hard scale. The short lifetime of the top quark implies that the top quark decays before it can form bound states. Therefore, top quark physics is described by perturbative QCD. The absence of hadronisation effects allows also that spin information of the top quark is transferred to its decay products. Finally, the large top mass implies also that the top quark contributions are relevant to precision physics. For example, the top gives a significant contribution to the Higgs self-energy and a precise knowledge of the top mass is required for an indirect determination of the Higgs mass from electro-weak precision fits. This raises immediately the question how precise the top quark mass can be extracted from experiments. There are some theoretical subtleties which should be taken into account. The starting point for a theoretical description is the Lagrange density, the relevant part reads It should be stressed that Z m and hence m renorm depend on the renormalisation scheme. Popular choices for a renormalisation scheme are the on-shell scheme, where the the mass m pole is defined as the pole of the propagator (and m pole is therefore called the pole mass), or the MS-scheme, in which the MS-mass m MS (µ) is scale-dependent. Within perturbation theory one can convert between the different schemes. Naively, the pole mass seems to be the natural choice. However, the exact definition of the pole mass assumes the concept of stable colour-less particle. The top quark is neither stable nor colour-less, and this re-introduces non-perturbative effects. As a result, the pole mass is ambiguous by an amount O Λ QCD [2][3][4][5]. This ambiguity limits the precision by which the pole mass can be extracted from experiment. As an alternative one can use a mass definition, which is only sensitive to short distances. The MS-mass m MS (µ) is an example of a short-distance mass. The direct extrac...

show abstract

“…The list of discriminating variables has been chosen based on an analysis of Feynman diagrams of signals and backgrounds [37] and on a study of single top quark production at NLO [11,12].…”

Section: A Discriminating Variablesmentioning

confidence: 99%

Multivariate searches for single top quark production with the D0 detector

Abazov¹,

Abbott²,

Abolins³

et al. 2007

Phys. Rev. D

View full text Add to dashboard Cite

submitted to Phys. Rev. D, Fermilab preprint - D0We present a search for electroweak production of single top quarks in the s-channel (p-pbar -> t bbar + X) and t-channel (p-pbar -> tq bbar + X) modes. We have analyzed 230 pb^(-1) of data collected with the D0 detector at the Fermilab Tevatron collider at a center-of-mass energy of sqrt(s) = 1.96 TeV. Two separate analysis methods are used: neural networks and a cut-based analysis. No evidence for a single top quark signal is found. We set 95% confidence level upper limits on the production cross sections using Bayesian statistics, based on event counts and binned likelihoods formed from the neural network output. The limits from the neural network (cut-based) analysis are 6.4 pb (10.6 pb) in the s-channel and 5.0 pb (11.3 pb) in the t-channel

show abstract

Next-to-leading order corrections to single top quark production and decay at the Fermilab Tevatron:s-channel process

Cited by 93 publications

References 65 publications

Constraints on Randall-Sundrum model from the events of dijet production with QCD next-to-leading order accuracy at the LHC

Constraints on Randall-Sundrum model from the events of dijet production with QCD next-to-leading order accuracy at the LHC

Theoretical overview on top pair production and single top production

Multivariate searches for single top quark production with the D0 detector

Contact Info

Product

Resources

About