Spin effects in processes of single top quark production at hadron colliders

Boos, E.; Sherstnev, A.

doi:10.1016/s0370-2693(02)01659-3

Cited by 30 publications

(25 citation statements)

References 17 publications

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“…For example, one can study the Cabibbo-KobayashiMaskawa (CKM) matrix element V tb , new W -t-b couplings beyond the Standard Model (SM) [14,15,16,17,18,19,20,21,22,23,24,25], and CP violation [26,27,28] in single top quark production and decay. The angular correlations among the decay products of polarized top quarks also provide a useful handle on these couplings [29,30,31,32,33,34,35,36]. The t-channel production process can also provide us with information about the b quark distribution function inside the proton.…”

Section: Introductionmentioning

confidence: 99%

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

2005

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We present a study of s-channel single top quark production at the upgraded Tevatron pp collider, including the next-to-leading order (NLO) QCD corrections to the production and decay of the top quark. The "modified" narrow width approximation was adopted to preserve the spin of the top quark in its production and decay. We discuss the effect of the different O(α s ) contributions on the inclusive cross section as well as various kinematical distributions after imposing the relevant cuts to select s-channel single top signal events. In particular the O(α s ) decay contribution, while small in size, has a significant impact on several distributions. With the help of the best-jet algorithm to reconstruct the top quark we demonstrate that it is possible to study kinematical and spin correlations in s-channel single top events. We furthermore compare top quark spin measurements in two different basis and show how NLO corrections have to be taken into consideration in searches for the Higgs boson through W ± H associated production at the Tevatron.

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Section: Introductionmentioning

confidence: 99%

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

2005

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“…The V−A weak force produces highly polarized top quarks [66,86,87,88,89,80,81]. The polarization of the top quark becomes evident in the angular correlations between the observed daughter particles.…”

Section: Polarization Effectsmentioning

confidence: 99%

Measurement of single top quark production at D0 using a matrix element method

Mitrevski

2007

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Until now, the top quark has only been observed produced in pairs, by the strong force. According to the standard model, it can also be produced singly, via an electroweak interaction. Top quarks produced this way provide powerful ways to test the charged-current electroweak interactions of the top quark, to measure |V tb |, and to search for physics beyond the standard model. This thesis describes the application of the matrix element analysis technique to the search for single top quark production with the D0 detector using 0.9 fb −1 of Run II data. From a comparison of the matrix element discriminants between data and the background model, assuming a Standard Model s-channel to t-channel cross section ratio of σ s /σ t = 0.44, we measure the single top quark production cross section:This result has a p-value of 0.08%, corresponding to a 3.2 standard deviation Gaussian equivalent significance.

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“…It has been shown [15,16] that the top quark spin follows the direction of the down-type quark momentum in the top quark rest frame. This is the direction of the initial d quark for the s-channel and close to the direction of the final-state d quark for the t-channel.…”

Section: B Single Top Quark Productionmentioning

confidence: 99%

Multivariate searches for single top quark production with the D0 detector

Abazov¹,

Abbott²,

Abolins³

et al. 2007

Phys. Rev. D

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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

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Spin effects in processes of single top quark production at hadron colliders

Cited by 30 publications

References 17 publications

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

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

Measurement of single top quark production at D0 using a matrix element method

Multivariate searches for single top quark production with the D0 detector

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