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Christian Weiss - One of the best experts on this subject based on the ideXlab platform.
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fully Differential top pair production at a lepton collider from Threshold to continuum
Journal of High Energy Physics, 2018Co-Authors: Fabian Bach, Bijan Chokoufe Nejad, Andre H Hoang, Wolfgang Kilian, Jurgen Reuter, Maximilian Stahlhofen, T Teubner, Christian WeissAbstract:We present an approach to predict exclusive $$ {W}^{+}b{W}^{-}\overline{b} $$ production at lepton colliders that correctly describes the top-anti-top Threshold as well as the continuum region. We incorporate $$ t\overline{t} $$ form factors for the NLL Threshold resummation derived in NRQCD into a factorized relativistic cross section using an extended double-pole approximation, which accounts for fixed-order QCD corrections to the top decays at NLO. This is combined with the full fixed-order QCD result at NLO for $$ {W}^{+}b{W}^{-}\overline{b} $$ production to obtain predictions that are not only valid at Threshold but smoothly transition to the continuum region. Our implementation is based on the Monte Carlo event generator Whizard and the code Toppik and allows to compute fully-Differential Threshold-resummed cross sections including the interference with non-resonant background processes. For the first time it is now possible to systematically study general Differential observables at future lepton colliders involving the decay products of the top quarks at energies close to the pair production Threshold and beyond.
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fully Differential top pair production at a lepton collider from Threshold to continuum
arXiv: High Energy Physics - Phenomenology, 2017Co-Authors: Fabian Bach, Bijan Chokoufe Nejad, Andre H Hoang, Wolfgang Kilian, Jurgen Reuter, Maximilian Stahlhofen, T Teubner, Christian WeissAbstract:We present an approach to predict exclusive $W^+bW^-\bar{b}$ production at lepton colliders that correctly describes the top-anti-top Threshold as well as the continuum region. We incorporate $t\bar{t}$ form factors for the NLL Threshold resummation derived in NRQCD into a factorized relativistic cross section using an extended double-pole approximation, which accounts for fixed-order QCD corrections to the top decays at NLO. This is combined with the full fixed-order QCD result at NLO for $W^+bW^-\bar{b}$ production to obtain predictions that are not only valid at Threshold but smoothly transition to the continuum region. Our implementation is based on the Monte Carlo event generator WHIZARD and the code TOPPIK and allows to compute fully-Differential Threshold-resummed cross sections including the interference with non-resonant background processes. For the first time it is now possible to systematically study general Differential observables at future lepton colliders involving the decay products of the top quarks at energies close to the pair production Threshold and beyond.
Fabian Bach - One of the best experts on this subject based on the ideXlab platform.
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fully Differential top pair production at a lepton collider from Threshold to continuum
Journal of High Energy Physics, 2018Co-Authors: Fabian Bach, Bijan Chokoufe Nejad, Andre H Hoang, Wolfgang Kilian, Jurgen Reuter, Maximilian Stahlhofen, T Teubner, Christian WeissAbstract:We present an approach to predict exclusive $$ {W}^{+}b{W}^{-}\overline{b} $$ production at lepton colliders that correctly describes the top-anti-top Threshold as well as the continuum region. We incorporate $$ t\overline{t} $$ form factors for the NLL Threshold resummation derived in NRQCD into a factorized relativistic cross section using an extended double-pole approximation, which accounts for fixed-order QCD corrections to the top decays at NLO. This is combined with the full fixed-order QCD result at NLO for $$ {W}^{+}b{W}^{-}\overline{b} $$ production to obtain predictions that are not only valid at Threshold but smoothly transition to the continuum region. Our implementation is based on the Monte Carlo event generator Whizard and the code Toppik and allows to compute fully-Differential Threshold-resummed cross sections including the interference with non-resonant background processes. For the first time it is now possible to systematically study general Differential observables at future lepton colliders involving the decay products of the top quarks at energies close to the pair production Threshold and beyond.
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fully Differential top pair production at a lepton collider from Threshold to continuum
arXiv: High Energy Physics - Phenomenology, 2017Co-Authors: Fabian Bach, Bijan Chokoufe Nejad, Andre H Hoang, Wolfgang Kilian, Jurgen Reuter, Maximilian Stahlhofen, T Teubner, Christian WeissAbstract:We present an approach to predict exclusive $W^+bW^-\bar{b}$ production at lepton colliders that correctly describes the top-anti-top Threshold as well as the continuum region. We incorporate $t\bar{t}$ form factors for the NLL Threshold resummation derived in NRQCD into a factorized relativistic cross section using an extended double-pole approximation, which accounts for fixed-order QCD corrections to the top decays at NLO. This is combined with the full fixed-order QCD result at NLO for $W^+bW^-\bar{b}$ production to obtain predictions that are not only valid at Threshold but smoothly transition to the continuum region. Our implementation is based on the Monte Carlo event generator WHIZARD and the code TOPPIK and allows to compute fully-Differential Threshold-resummed cross sections including the interference with non-resonant background processes. For the first time it is now possible to systematically study general Differential observables at future lepton colliders involving the decay products of the top quarks at energies close to the pair production Threshold and beyond.
H H Bulthoff - One of the best experts on this subject based on the ideXlab platform.
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accumulation of inertial sensory information in the perception of whole body yaw rotation
PLOS ONE, 2017Co-Authors: Alessandro Nesti, Ksander N De Winkel, H H BulthoffAbstract:: While moving through the environment, our central nervous system accumulates sensory information over time to provide an estimate of our self-motion, allowing for completing crucial tasks such as maintaining balance. However, little is known on how the duration of the motion stimuli influences our performances in a self-motion discrimination task. Here we study the human ability to discriminate intensities of sinusoidal (0.5 Hz) self-rotations around the vertical axis (yaw) for four different stimulus durations (1, 2, 3 and 5 s) in darkness. In a typical trial, participants experienced two consecutive rotations of equal duration and different peak amplitude, and reported the one perceived as stronger. For each stimulus duration, we determined the smallest detectable change in stimulus intensity (Differential Threshold) for a reference velocity of 15 deg/s. Results indicate that Differential Thresholds decrease with stimulus duration and asymptotically converge to a constant, positive value. This suggests that the central nervous system accumulates sensory information on self-motion over time, resulting in improved discrimination performances. Observed trends in Differential Thresholds are consistent with predictions based on a drift diffusion model with leaky integration of sensory evidence.
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human discrimination of head centred visual inertial yaw rotations
Experimental Brain Research, 2015Co-Authors: Alessandro Nesti, K Beykirch, P Pretto, H H BulthoffAbstract:To successfully perform daily activities such as maintaining posture or running, humans need to be sensitive to self-motion over a large range of motion intensities. Recent studies have shown that the human ability to discriminate self-motion in the presence of either inertial-only motion cues or visual-only motion cues is not constant but rather decreases with motion intensity. However, these results do not yet allow for a quantitative description of how self-motion is discriminated in the presence of combined visual and inertial cues, since little is known about visual–inertial perceptual integration and the resulting self-motion perception over a wide range of motion intensity. Here we investigate these two questions for head-centred yaw rotations (0.5 Hz) presented either in darkness or combined with visual cues (optical flow with limited lifetime dots). Participants discriminated a reference motion, repeated unchanged for every trial, from a comparison motion, iteratively adjusted in peak velocity so as to measure the participants’ Differential Threshold, i.e. the smallest perceivable change in stimulus intensity. A total of six participants were tested at four reference velocities (15, 30, 45 and 60 °/s). Results are combined for further analysis with previously published Differential Thresholds measured for visual-only yaw rotation cues using the same participants and procedure. Overall, Differential Thresholds increase with stimulus intensity following a trend described well by three power functions with exponents of 0.36, 0.62 and 0.49 for inertial, visual and visual–inertial stimuli, respectively. Despite the different exponents, Differential Thresholds do not depend on the type of sensory input significantly, suggesting that combining visual and inertial stimuli does not lead to improved discrimination performance over the investigated range of yaw rotations.
Yuan Yuan - One of the best experts on this subject based on the ideXlab platform.
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Learning saliency by MRF and Differential Threshold
IEEE Transactions on Cybernetics, 2013Co-Authors: Guokang Zhu, Qi Wang, Yuan YuanAbstract:Saliency detection has been an attractive topic in recent years. The reliable detection of saliency can help a lot of useful processing without prior knowledge about the scene, such as content-aware image compression, segmentation, etc. Although many efforts have been spent in this subject, the feature expression and model construction are far from perfect. The obtained saliency maps are therefore not satisfying enough. In order to overcome these challenges, this paper presents a new psychologic visual feature based on Differential Threshold and applies it in a supervised Markov-random-field framework. Experiments on two public data sets and an image retargeting application demonstrate the effectiveness, robustness, and practicability of the proposed method.
Jurgen Reuter - One of the best experts on this subject based on the ideXlab platform.
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fully Differential top pair production at a lepton collider from Threshold to continuum
Journal of High Energy Physics, 2018Co-Authors: Fabian Bach, Bijan Chokoufe Nejad, Andre H Hoang, Wolfgang Kilian, Jurgen Reuter, Maximilian Stahlhofen, T Teubner, Christian WeissAbstract:We present an approach to predict exclusive $$ {W}^{+}b{W}^{-}\overline{b} $$ production at lepton colliders that correctly describes the top-anti-top Threshold as well as the continuum region. We incorporate $$ t\overline{t} $$ form factors for the NLL Threshold resummation derived in NRQCD into a factorized relativistic cross section using an extended double-pole approximation, which accounts for fixed-order QCD corrections to the top decays at NLO. This is combined with the full fixed-order QCD result at NLO for $$ {W}^{+}b{W}^{-}\overline{b} $$ production to obtain predictions that are not only valid at Threshold but smoothly transition to the continuum region. Our implementation is based on the Monte Carlo event generator Whizard and the code Toppik and allows to compute fully-Differential Threshold-resummed cross sections including the interference with non-resonant background processes. For the first time it is now possible to systematically study general Differential observables at future lepton colliders involving the decay products of the top quarks at energies close to the pair production Threshold and beyond.
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fully Differential top pair production at a lepton collider from Threshold to continuum
arXiv: High Energy Physics - Phenomenology, 2017Co-Authors: Fabian Bach, Bijan Chokoufe Nejad, Andre H Hoang, Wolfgang Kilian, Jurgen Reuter, Maximilian Stahlhofen, T Teubner, Christian WeissAbstract:We present an approach to predict exclusive $W^+bW^-\bar{b}$ production at lepton colliders that correctly describes the top-anti-top Threshold as well as the continuum region. We incorporate $t\bar{t}$ form factors for the NLL Threshold resummation derived in NRQCD into a factorized relativistic cross section using an extended double-pole approximation, which accounts for fixed-order QCD corrections to the top decays at NLO. This is combined with the full fixed-order QCD result at NLO for $W^+bW^-\bar{b}$ production to obtain predictions that are not only valid at Threshold but smoothly transition to the continuum region. Our implementation is based on the Monte Carlo event generator WHIZARD and the code TOPPIK and allows to compute fully-Differential Threshold-resummed cross sections including the interference with non-resonant background processes. For the first time it is now possible to systematically study general Differential observables at future lepton colliders involving the decay products of the top quarks at energies close to the pair production Threshold and beyond.