Top quark production near threshold

Beneke, Μ.

doi:10.1016/s0920-5632(00)00621-6

Cited by 10 publications

(17 citation statements)

References 21 publications

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“…The t t background sample is also generated with pythia [24], with W bosons and τ leptons forced to leptonic decays, but with b quarks left to decay freely. Both gluon fusion and quark annihilation initial states are simulated and the cross-section is normalised to the NLO value of 840 ± 5%(scale) ± 3%(PDF) pb [45].…”

Section: Datasets For Signal and Background Processesmentioning

confidence: 99%

“…The following sources of systematic uncertainty are common for all three channels: (i) the theoretical errors to the total rates of the signal is th ≈ 4%, rising to 10% for t W . The uncertainties in the background events are assumed to be: 5% for tt [45], 17% for W bb j, 7% for W + jets, 5% for W j j [319], and 5% for W bb. (ii) the jet energy scale (JES) uncertainty: using a calibration method based on tt events [320], the JES uncertainty after 10 fb −1 integrated luminosity is expected to be ±5% (±2.5%) for jets with p T ≈ 20 GeV/c ( p T > 50 GeV/c).…”

Section: Systematic Uncertaintiesmentioning

confidence: 99%

See 1 more Smart Citation

CMS Physics Technical Design Report, Volume II: Physics Performance

Bayatian¹,

Chatrchyan²,

Hmayakyan³

et al. 2007

J. Phys. G: Nucl. Part. Phys.

717

161

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CMS is a general purpose experiment, designed to study the physics of pp collisions at 14 TeV at the Large Hadron Collider (LHC). It currently involves more than 2000 physicists from more than 150 institutes and 37 countries. The LHC will provide extraordinary opportunities for particle physics based on its unprecedented collision energy and luminosity when it begins operation in 2007.The principal aim of this report is to present the strategy of CMS to explore the rich physics programme offered by the LHC. This volume demonstrates the physics capability of the CMS experiment. The prime goals of CMS are to explore physics at the TeV scale and to study the mechanism of electroweak symmetry breaking-through the discovery of the Higgs particle or otherwise. To carry out this task, CMS must be prepared to search for new particles, such as the Higgs boson or supersymmetric partners of the Standard Model particles, from the start-up of the LHC since new physics at the TeV scale may manifest itself with modest data samples of the order of a few fb −1 or less. The analysis tools that have been developed are applied to study in great detail and with all the methodology of performing an analysis on CMS data specific benchmark processes upon which to gauge the performance of CMS. These processes cover several Higgs boson decay channels, the production and decay of new particles such as Z and supersymmetric particles, B s production and processes in heavy ion collisions. The simulation of these benchmark processes includes subtle effects such as possible detector miscalibration and misalignment. Besides these benchmark processes, the physics reach of CMS is studied for a large number of signatures arising in the Standard Model and also in theories beyond the Standard Model for integrated luminosities ranging from 1 fb −1 to 30 fb −1 . The Standard Model processes include QCD, B-physics, diffraction, detailed studies of the top quark properties, and electroweak physics topics such as the W and Z 0 boson properties. The production and decay of the Higgs particle is studied for many observable decays, and the precision with which the Higgs boson properties can be derived is determined. About ten different supersymmetry benchmark points are analysed using full simulation. The CMS discovery reach is evaluated in the SUSY parameter space covering a large variety of decay signatures.

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Section: Datasets For Signal and Background Processesmentioning

confidence: 99%

Section: Systematic Uncertaintiesmentioning

confidence: 99%

CMS Physics Technical Design Report, Volume II: Physics Performance

Bayatian¹,

Chatrchyan²,

Hmayakyan³

et al. 2007

J. Phys. G: Nucl. Part. Phys.

717

161

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“…Here we focus on a different issue, non-resonant production of the physical final state after top decay, which though known for some time (see, e.g., the discussion in [29]) has been left aside up to now. The top quark is unstable with a significant width Γ t of about 1.5 GeV due to the electroweak interaction.…”

Section: Introductionmentioning

confidence: 99%

Electroweak non-resonant NLO corrections to in the resonance region

2010

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We analyse subleading electroweak effects in the top anti-top resonance production region in e + e − collisions which arise due to the decay of the top and anti-top quarks into the W + W − bb final state. These are NLO corrections adopting the nonrelativistic power counting v ∼ α s ∼ √ α EW . In contrast to the QCD corrections which have been calculated (almost) up to NNNLO, the parametrically larger NLO electroweak contributions have not been completely known so far, but are mandatory for the required accuracy at a future linear collider. The missing parts of these NLO contributions arise from matching coefficients of non-resonant productiondecay operators in unstable-particle effective theory which correspond to off-shell top production and decay and other non-resonant irreducible background processes to tt production. We consider the total cross section of the e + e − → W + W − bb process and additionally implement cuts on the invariant masses of the W + b and W −b pairs.

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“…However, since t m t , the narrow width approximation approach is valid for t and t quarks. Using this method, it has been shown that the best way to analyse the t t correlation is through angular correlation among the two charged leptons l and l in the di-lepton final state [19]. To obtain the differential cross section of the process e − e + → t t → b lν l bl ν l , the production and decay spin density matrices are written as the usual approach.…”

Section: The Non-universal Gauge Boson Z and The T T Spin Correlation...mentioning

confidence: 99%

“…The coefficients B 1 (B 2 ) and C are related to the mean t ( t) polarization and spin correlation projected into the direction of the spin axis. The spin correlation coefficient C can be written as C = αlα l s t st , (19) where α i is the spin analysing power of particle i, which has opposite signs for the charged leptons l and l. At the leading order, there are αl = −α l = −1.…”

Section: The Non-universal Gauge Boson Z and The T T Spin Correlation...mentioning

confidence: 99%

Non-universal gauge bosonZ′ and the spin correlation of top quark pair production at e⁻e⁺colliders

Yue¹,

Wang²

2006

J. Phys. G: Nucl. Part. Phys.

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Top quark production near threshold

Abstract: The present theoretical status of top quark pair production near threshold at (future) e + e − (µ + µ − ) colliders is summarized.

Cited by 10 publications

References 21 publications

CMS Physics Technical Design Report, Volume II: Physics Performance

CMS Physics Technical Design Report, Volume II: Physics Performance

Electroweak non-resonant NLO corrections to in the resonance region

Non-universal gauge bosonZ′ and the spin correlation of top quark pair production at e⁻e⁺colliders

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Top quark production near threshold

Abstract: The present theoretical status of top quark pair production near threshold at (future) e + e − (µ + µ − ) colliders is summarized.

Cited by 10 publications

References 21 publications

CMS Physics Technical Design Report, Volume II: Physics Performance

CMS Physics Technical Design Report, Volume II: Physics Performance

Electroweak non-resonant NLO corrections to in the resonance region

Non-universal gauge bosonZ′ and the spin correlation of top quark pair production at e−e+colliders

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Product

Resources

About

Non-universal gauge bosonZ′ and the spin correlation of top quark pair production at e⁻e⁺colliders