A new version of the multi-dimensional integration and event generation package BASES/SPRING

Kawabata, S.

doi:10.1016/0010-4655(95)00028-e

Cited by 179 publications

(146 citation statements)

References 7 publications

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“…(5) For loop integrations, all tensor one-loop integrals are reduced to scalar integrals using our own formalism, whereupon the integrations are performed using the packages FF [30] and LoopTools [31]. (6) Phase-space integrations are done using an adaptive Monte Carlo integration package BASES [32,33]. (7) For numerical calculations, we use quadruple precision for floating-point variables.…”

Section: Calculation Methodsmentioning

confidence: 99%

Beam polarization effects on top-pair production at the ILC

et al. 2018

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Full one-loop electroweak corrections for an e − e + → tt process associated with sequential t → bμν μ decay are discussed. At the one-loop level, the spinpolarization effects of the initial electron and positron beams are included in the total and differential cross sections. A narrow-width approximation is used to treat the top-quark production and decay while including full spin correlations between them. We observed that the radiative corrections due to the weak interaction have a large polarization dependence on both the total and the differential cross sections. Therefore, experimental observables that depend on angular distributions such as the forward-backward asymmetry of the top-production angle must be treated carefully including radiative corrections. We also observed that the energy distribution of bottom quarks is largely affected by the radiative corrections.

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Section: Calculation Methodsmentioning

confidence: 99%

Beam polarization effects on top-pair production at the ILC

et al. 2018

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“…Furthermore, we demonstrate how the effects of QCD initial-state or final-state radiation (ISR or FSR) and those of finite detector resolution affect the measurements. In order to study systematics of higher order QCD corrections, we prepare two types of event samples: one is generated by MADGRAPH5_AMC@NLO [16,17] where the W þ jet events are calculated at the NLO þ PS (parton shower) level, and the other is generated by a handmade event generator, which we call LOMC, where all the F 1-9 structure functions are implemented at the LO with the help of BASES/SPRING code [18]. We stress that, although the MADGRAPH5_AMC@NLO code generates events with NLO accuracy, the T-odd observables constructed from these events are accurate at LO because these observables receive contributions only at the one-loop level and beyond.…”

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confidence: 99%

T-Odd Asymmetry inW+jetEvents at the LHC

et al. 2014

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W bosons produced at high transverse momentum in hadron collisions can have polarization along the direction perpendicular to the production plane, which is odd under naïve T reversal where both the threemomenta and angular momenta are reversed. Perturbative QCD predicts nonzero polarization at the one-loop level, which can be measured as parity-odd components in the angular distribution of charged leptons from the decay of W bosons. We perform a detector-level simulation with the generator MADGRAPH5_AMC@NLO, and demonstrate that the asymmetry can be observed at the 8 TeV LHC with 20 fb −1 of data. If confirmed, it will be the first experimental measurement of the sign of the imaginary part of one-loop QCD amplitudes.

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“…We use CT10 [65] for the parton distributions for collider physics and BASES [66,67] to do the phase space integration. In the numerical calculations, we take the input as Before presenting the numerical predictions, several checks should be done.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Precise photoproduction of the charged top-pions at the LHC with forward detector acceptances

Sun

Yue

2014

Eur. Phys. J. C

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We study the photoproduction of the charged toppion predicted by the top triangle moose (TTM) model (a deconstructed version of the topcolor-assisted technicolor TC2 model) via the processes pp → pγ p → π ± t t + X at the 14 TeV Large Hadron Collider (LHC) including nextto-leading order (NLO) QCD corrections. Our results show that the production cross sections and distributions are sensitive to the free parameters sin ω and M π t . A typical QCD correction value is 7−11 % and this does not depend much on sin ω as well as the forward detector acceptances.

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A new version of the multi-dimensional integration and event generation package BASES/SPRING

Cited by 179 publications

References 7 publications

Beam polarization effects on top-pair production at the ILC

Beam polarization effects on top-pair production at the ILC

T-Odd Asymmetry inW+jetEvents at the LHC

Precise photoproduction of the charged top-pions at the LHC with forward detector acceptances

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