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9 results on '"Srebre Matej"'

1. Pixel Detector Background Generation using Generative Adversarial Networks at Belle II

Author

Hashemi Hosein, Hartmann Nikolai, Kuhr Thomas, Ritter Martin, and Srebre Matej

Subjects
Physics, QC1-999
Abstract

The pixel vertex detector (PXD) is an essential part of the Belle II detector recording particle positions. Data from the PXD and other sensors allow us to reconstruct particle tracks and decay vertices. The effiect of background hits on track reconstruction is simulated by adding measured or simulated background hit patterns to the hits produced by simulated signal particles. This model requires a large set of statistically independent PXD background noise samples to avoid a systematic bias of reconstructed tracks. However, data from the fine-grained PXD requires a substantial amount of storage. As an efficient way of producing background noise, we explore the idea of an on-demand PXD background generator using conditional Generative Adversarial Networks (GANs), adapted by the number of PXD sensors in order to both increase the image fidelity and produce sensor-dependent PXD hitmaps.

Published
2021
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2. Generation of Belle II Pixel Detector Background Data with a GAN

Author

Srebre Matej, Schmolz Pascal, Hashemi Hosein, Ritter Martin, and Kuhr Thomas

Subjects
Physics, QC1-999
Abstract

To match the statistical precision due to the large dataset that Belle II is expected to collect, simulations that accurately describe real data are required. The effect of beam background must be considered and can be taken into account with overlaying random trigger data, but its large size is a technical challenge. This problem can be mitigated by generating beam background data with generative adversarial networks. A proof of principle is shown for the background data recorded by the pixel vertex detector.

Published
2020
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3. $\alpha_s$ and $\rm V_{cs}$ determination, and CKM unitarity test, from W decays at NNLO

Author

d'Enterria, David and Srebre, Matej

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Experiment
Abstract

The hadronic ($\Gamma^{\rm W}_{\rm had}$) and total ($\Gamma^{\rm W}_{\rm tot}$) widths of the W boson, computed at least at next-to-next-to-leading-order (NNLO) accuracy, are combined to derive a new precise prediction for the hadronic W branching ratio ${\cal B}^{\rm W}_{\rm had} \equiv \Gamma^{\rm W}_{\rm had}/\Gamma^{\rm W}_{\rm tot}$ = $0.682 \pm 0.011_{\rm par}$, using the experimental Cabibbo-Kobayashi-Maskawa (CKM) matrix elements, or ${\cal B}^{\rm W}_{\rm had} = 0.6742 \pm 0.0002_{\rm th} \pm 0.0001_{\rm par}$ assuming CKM unitarity, with uncertainties dominated by the input parameters of the calculations. Comparing the theoretical predictions and experimental measurements for various W decay observables, the NNLO strong coupling constant at the Z pole, $\alpha_s(m_Z) = 0.117 \pm 0.042_{\rm exp} \pm 0.004_{\rm th} \pm 0.001_{\rm par}$, as well as the charm-strange CKM element, $\rm V_{cs}$ = 0.973 $\pm$ 0.004$_{\rm exp}$ $\pm$ 0.002$_{\rm par}$, can be extracted under different assumptions. We also show that W decays provide today the most precise test of CKM unitarity for the 5 quarks lighter than $m_{\rm W}$, $\sum_{ u,c,d,s,b} |V_{ ij}|^2 = 1.999 \pm 0.008_{\rm exp} \pm 0.001_{\rm th}$. Perspectives for $\alpha_s$ and $\rm V_{cs}$ extractions from W decays measurements at the LHC and future $e^+e^-$ colliders are presented., Comment: 8 pages, 7 figures. Updated version with minor changes to match published version in Phys. Lett. B

Published
2016
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4. PE-GAN: Prior Embedding GAN for PXD images at Belle II

Author

Hashemi, Baran, Hartmann, Nikolai, Kuhr, Thomas, Ritter, Martin, srebre, Matej, Hashemi, Baran, Hartmann, Nikolai, Kuhr, Thomas, Ritter, Martin, and srebre, Matej

Abstract

The pixel vertex detector (PXD) is an essential part of the Belle II detector recording particle positions. Data from the PXD and other sensors allow us to reconstruct particle tracks and decay vertices. The effect of background hits on track reconstruction is simulated by adding measured or simulated background hit patterns to the hits produced by simulated signal particles. This model requires a large set of statistically independent PXD background noise samples to avoid a systematic bias of reconstructed tracks. However, data from the fine-grained PXD requires a substantial amount of storage. As an efficient way of producing background noise, we explore the idea of an on-demand PXD background generator using conditional Generative Adversarial Networks (GANs) with contrastive learning, adapted by the number of PXD sensors in order to both increase the image fidelity and produce sensor-dependent PXD hitmaps., Comment: 25th International Conference on Computing in High Energy and Nuclear Physics (CHEP 2021)

Published
2023
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5. PE-GAN: Prior Embedding GAN for PXD images at Belle II

Author

Hashemi, Hosein, Hartmann, Nikolai, Kuhr, Thomas, Ritter, Martin, and srebre, Matej

Subjects
FOS: Computer and information sciences, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Statistics - Machine Learning, Computer Vision and Pattern Recognition (cs.CV), Computer Science - Computer Vision and Pattern Recognition, FOS: Physical sciences, Machine Learning (stat.ML)
Abstract

The pixel vertex detector (PXD) is an essential part of the Belle II detector recording particle positions. Data from the PXD and other sensors allow us to reconstruct particle tracks and decay vertices. The effect of background hits on track reconstruction is simulated by adding measured or simulated background hit patterns to the hits produced by simulated signal particles. This model requires a large set of statistically independent PXD background noise samples to avoid a systematic bias of reconstructed tracks. However, data from the fine-grained PXD requires a substantial amount of storage. As an efficient way of producing background noise, we explore the idea of an on-demand PXD background generator using conditional Generative Adversarial Networks (GANs) with contrastive learning, adapted by the number of PXD sensors in order to both increase the image fidelity and produce sensor-dependent PXD hitmaps., Comment: 25th International Conference on Computing in High Energy and Nuclear Physics (CHEP 2021)

Published
2023
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6. Generation of Belle II Pixel Detector Background Data with a GAN.

Author

Doglioni, C., Kim, D., Stewart, G.A., Silvestris, L., Jackson, P., Kamleh, W., Srebre, Matej, Schmolz, Pascal, Hashemi, Hosein, Ritter, Martin, and Kuhr, Thomas

Subjects
ELECTRON beams, PARTICLE accelerators, PARTICLE detectors, COMPUTER simulation, DATA analysis
Abstract

To match the statistical precision due to the large dataset that Belle II is expected to collect, simulations that accurately describe real data are required. The effect of beam background must be considered and can be taken into account with overlaying random trigger data, but its large size is a technical challenge. This problem can be mitigated by generating beam background data with generative adversarial networks. A proof of principle is shown for the background data recorded by the pixel vertex detector. [ABSTRACT FROM AUTHOR]

Published
2020
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7. And | | determination, and CKM unitarity test, from W decays at NNLO

Author

d'Enterria, David and Srebre, Matej

Abstract

The hadronic (ΓhadW) and total (ΓtotW) widths of the W boson, computed at least at next-to-next-to-leading-order (NNLO) accuracy, are combined to derive a new precise prediction for the hadronic W branching ratio BhadW ≡ ΓhadW/ΓtotW=0.682±0.011par, using the experimental Cabibbo–Kobayashi–Maskawa (CKM) matrix elements, with uncertainties dominated by the input parameters of the calculations, or BhadW=0.6742±0.0002th±0.0001par assuming CKM unitarity. Comparing the theoretical predictions and experimental measurements for various W decay observables, the NNLO strong coupling constant at the Z pole, αs(mZ2)=0.117±0.042exp±0.004th±0.001par, as well as the charm-strange CKM element, |Vcs|=0.973±0.004exp±0.002par, can be extracted under different assumptions. We also show that W decays provide today the most precise test of CKM unitarity for the 5 quarks lighter than mW, ∑u,c,d,s,b|Vij|2=1.999±0.008exp±0.001th. Perspectives for αs and |Vcs| extractions from W decays measurements at the LHC and future e+e− colliders are presented.

Published
2016

8. $\alpha_s$ from hadronic W decays

Author

Srebre, Matej and d'Enterria, David

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract

The strong coupling is extracted from hadronic W boson decays using the most recent theoretical and experimental inputs, obtaining α s (m 2 Z ) = 0.117±0.043 exp ±0.001 th (assuming CKM matrix unitarity), where a detailed estimation of the associated uncertainties is provided for the first time. Prospects for future α s dete

Published
2015

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