Article
Physics, Particles & Fields
Stefano Frixione, Bryan R. Webber
Summary: This article discusses how color flows can simplify the computation of matrix elements and enable parton shower Monte Carlos to achieve accuracy beyond leading color. By systematically employing these color flows, tree-level matrix elements and their soft limits can be given in a closed form that does not require any color algebra. Additionally, the study examines how color loops and dipole graphs can help extend the accuracy of Monte Carlos by including subleading-color effects.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Daniel de Florian, Ignacio Fabre, Gudrun Heinrich, Javier Mazzitelli, Ludovic Scyboz
Summary: This study combines NLO predictions with full top-quark mass dependence with approximate NNLO predictions for Higgs-boson pair production in gluon fusion. It examines the impact of anomalous couplings on various observables and provides numerical coefficients for the approximate NNLO cross section as a function of the anomalous couplings at root s = 14TeV.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Dhimiter D. Canko, Costas G. Papadopoulos, Nikolaos Syrrakos
Summary: Analytic expressions for three families of planar two-loop five-point Master Integrals with one off-shell leg are presented in terms of polylogarithmic functions, using the Simplified Differential Equations approach. The results are relevant for studying various 2 -> 3 scattering processes at the LHC, particularly for leading-color W + 2 jets production.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Bakul Agarwal, Stephen P. Jones, Andreas von Manteuffel
Summary: This study calculates the two-loop QCD corrections to gg -> ZZ involving a closed top-quark loop using a new method, with the amplitude expressed in terms of finite integrals derived by employing syzygies. Numerical integration results show agreement with previous expansions in asymptotic limits and provide ab initio results for intermediate partonic energies and non-central scattering at higher energies.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Luca Buonocore, Paolo Nason, Francesco Tramontano, Giulia Zanderighi
Summary: This study examines several basic photon and lepton-initiated processes at the LHC, utilizing recently developed photon and lepton parton densities for computation. The comparison of different calculation methods and their application in searching for exotic particles and observing Standard-Model processes are discussed.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Matthias Heller, Andreas von Manteuffel, Robert M. Schabinger, Hubert Spiesberger
Summary: The study focuses on the qq-initiated two-loop electroweak-QCD Drell-Yan scattering amplitude with vanishing light quark and lepton masses using dimensional regularization schemes. It is found that the infrared pole terms of the mixed two-loop amplitude are controlled by a known generalization of the dipole formula, and that exactly the same two-loop polarized hard scattering functions are obtained in both the standard 't Hooft-Veltman-Breitenlohner-Maison gamma(5) scheme and Kreimer's anticommuting gamma(5) scheme.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Fabrizio Caola, Silvia Ferrario Ravasio, Giovanni Limatola, Kirill Melnikov, Paolo Nason
Summary: In this study, we investigate the impact of linear power corrections related to QCD on certain collider observables. By presenting arguments, we conclude that such corrections do not appear in inclusive observables with respect to QCD radiation. Although our study is conducted in a simplified framework, the results can be applied, to some extent, to processes in both lepton and hadron colliders.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Simone Alioli, Alessandro Broggio, Matthew A. Lim
Summary: We study the resummation of the 0-jettiness resolution variable tau(0) for the top-quark pair production process in hadronic collisions. Starting from an effective theory framework, we derive a factorisation formula for this observable and calculate its corrections. By matching with fixed order calculations, we obtain the most accurate prediction for the process.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Jeffrey R. Forshaw, Jack Holguin
Summary: In QCD, coherence violation is an interesting and counter-intuitive phenomenon, almost all observables sensitive to soft radiation at hadron colliders will violate coherence to some degree.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Anatoly Radyushkin, Shuai Zhao
Summary: This study presents one-loop corrections for the newly introduced gluon condensate PDF F(x) and provides the expression for the gg-part of its evolution kernel. By strictly adhering to gauge invariance requirements and utilizing on-shell states, it was discovered that there were terms such as q^2δ(x) found for the ξ = 0 GPD F(x, q^2) at nonzero momentum transfer q. The results did not align with the original attempt of one-loop calculations for gluon states, indicating caution for calculations using matrix elements with virtual external gluons.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Daniele Lombardi, Marius Wiesemann, Giulia Zanderighi
Summary: This study computes the NNLO+PS predictions for W+W- production in hadronic collisions, matching them consistently with parton showers using the MINNLOPS method. By including spin correlations, interferences, and off-shell effects, the evaluation time of the two-loop contribution has been significantly reduced. The results show good agreement with experimental measurements from ATLAS and CMS, highlighting the importance of NNLO corrections and matching to parton showers for an accurate simulation of W+W- events.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Martin Beneke, Philipp Boer, Jan-Niklas Toelstede, K. Keri Vos
Summary: This paper discusses the generalization of the leading-twist light-cone distribution amplitude for light mesons including QED effects and its renormalization group evolution at the strong-interaction scale Lambda(QCD). For charged mesons, there are qualitative differences in scale evolution between QCD and QED-generalized, especially regarding the endpoint behavior. The evolution equation is analytically solved to first order in the electromagnetic coupling alpha(em), which resums large logarithms in QCD while providing numerical estimates for QED corrections to Gegenbauer coefficients and inverse moments relevant to (QED-generalized) factorization theorems for hard exclusive processes.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
C. A. Flett, J. A. Gracey, S. P. Jones, T. Teubner
Summary: We calculate the exclusive electroproduction, gamma*p -> Vp, of heavy quarkonia V to NLO in the collinear factorisation scheme, which has been formally proven for this process, extending the photoproduction phase space of the exclusive heavy quarkonia observable to electroproduction kinematics with an off-shell virtuality Q(2) carried by the photon. This process is relevant for diffractive scattering at HERA and the upcoming EIC, as well as at the proposed LHeC and FCC.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Dhimiter D. Canko, Nikolaos Syrrakos
Summary: The article details two resummation methods derived from the Simplified Differential Equations approach applied to a canonical basis of master integrals. The first method facilitates determining boundary conditions by establishing relationships between basis elements, while the second method shows how solutions to a canonical basis with one mass less can be obtained through the x -> 1 limit. Both methods utilize residue matrices for the {0, 1} letters of the canonical differential equation, and are demonstrated through the application to a three-loop ladder-box canonical basis.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Piotr Bargiela, Fabrizio Caola, Andreas von Manteuffel, Lorenzo Tancredi
Summary: This study is of great importance for calculating the NNLO QCD corrections to diphoton production in gluon fusion. The researchers employed a new method to calculate scattering amplitudes, providing accurate and compact analytical results.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Nuclear
Richard D. Ball, Jon Butterworth, Amanda M. Cooper-Sarkar, Aurore Courtoy, Thomas Cridge, Albert De Roeck, Joel Feltesse, Stefano Forte, Francesco Giuli, Claire Gwenlan, Lucian A. Harland-Lang, T. J. Hobbs, Tie-Jiun Hou, Joey Huston, Ronan McNulty, Pavel M. Nadolsky, Emanuele R. Nocera, Tanjona R. Rabemananjara, Juan Rojo, Robert S. Thorne, Keping Xie, C-P Yuan
Summary: This article presents an updated global PDF fit, PDF4LHC21, which combines the CT18, MSHT20, and NNPDF3.1 sets using Monte Carlo methods. The new combination shows modest uncertainties reduction for key LHC processes compared to its predecessor, PDF4LHC15. Extensive benchmark studies are performed to understand the differences between the three global PDF sets. The phenomenological implications of PDF4LHC21 for a selection of cross sections at the LHC are also studied.
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2022)
Article
Physics, Particles & Fields
V Bertone, M. Cacciari, S. Frixione, G. Stagnitto, M. Zaro, X. Zhao
Summary: This article discusses the use of electron Parton Distribution Functions (PDFs) with next-to-leading collinear logarithmic accuracy in high-energy collision processes. It explores the effects of multiple fermion families and mass thresholds on the evolution of PDFs using the renormalisation group equation, as well as the dependences on factorisation and renormalisation schemes. The impact of uncertainties associated with PDFs on physical cross sections is studied to provide realistic precision estimates for observables computed with collinear-factorisation formulae.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Ansgar Denner, Giovanni Pelliccioli, Christopher Schwan
Summary: This article presents an NLO-accurate tZj calculation, which includes complete off-shell effects and spin correlations, combining QCD and electroweak radiative corrections to the LO signal. Integrated and differential cross sections are shown for a specific fiducial setup, improving the theoretical modeling of this process.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Nuclear
Jonathan L. Feng, Felix Kling, Mary Hall Reno, Juan Rojo, Dennis Soldin, Luis A. Anchordoqui, Jamie Boyd, Ahmed Ismail, Lucian Harland-Lang, Kevin J. Kelly, Vishvas Pandey, Sebastian Trojanowski, Yu-Dai Tsai, Jean-Marco Alameddine, Takeshi Araki, Akitaka Ariga, Tomoko Ariga, Kento Asai, Alessandro Bacchetta, Kincso Balazs, Alan J. Barr, Michele Battistin, Jianming Bian, Caterina Bertone, Weidong Bai, Pouya Bakhti, A. Baha Balantekin, Basabendu Barman, Brian Batell, Martin Bauer, Brian Bauer, Mathias Becker, Asher Berlin, Enrico Bertuzzo, Atri Bhattacharya, Marco Bonvini, Stewart T. Boogert, Alexey Boyarsky, Joseph Bramante, Vedran Brdar, Adrian Carmona, David W. Casper, Francesco Giovanni Celiberto, Francesco Cerutti, Grigorios Chachamis, Garv Chauhan, Matthew Citron, Emanuele Copello, Jean-Pierre Corso, Luc Darme, Raffaele Tito D'Agnolo, Neda Darvishi, Arindam Das, Giovanni De Lellis, Albert De Roeck, Jordy de Vries, Hans P. Dembinski, Sergey Demidov, Patrick DeNiverville, Peter B. Denton, Frank F. Deppisch, P. S. Bhupal Dev, Antonia Di Crescenzo, Keith R. Dienes, Milind Diwan, Herbi K. Dreiner, Yong Du, Bhaskar Dutta, Pit Duwentaester, Lucie Elie, Sebastian A. R. Ellis, Rikard Enberg, Yasaman Farzan, Max Fieg, Ana Luisa Foguel, Patrick Foldenauer, Saeid Foroughi-Abari, Jean-Francois Fortin, Alexander Friedland, Elina Fuchs, Michael Fucilla, Kai Gallmeister, Alfonso Garcia, Carlos A. Garcia Canal, Maria Vittoria Garzelli, Rhorry Gauld, Sumit Ghosh, Anish Ghoshal, Stephen Gibson, Francesco Giuli, Victor P. Goncalves, Dmitry Gorbunov, Srubabati Goswami, Silvia Grau, Julian Y. Guenther, Marco Guzzi, Andrew Haas, Timo Hakulinen, Steven P. Harris, Julia Harz, Juan Carlos Helo Herrera, Christopher S. Hill, Martin Hirsch, Timothy J. Hobbs, Stefan Hoche, Andrzej Hryczuk, Fei Huang, Tomohiro Inada, Angelo Infantino, Ameen Ismail, Richard Jacobsson, Sudip Jana, Yu Seon Jeong, Yongsoo Jho, Dmitry Kalashnikov, Timo J. Karkkainen, Cynthia Keppel, Jongkuk Kim, Michael Klasen, Spencer R. Klein, Pyungwon Ko, Dominik Koehler, Masahiro Komatsu, Karol Kovarik, Suchita Kulkarni, Jason Kumar, Karan Kumar, Jui-Lin Kuo, Frank Krauss, Aleksander Kusina, Maxim Laletin, Chiara Le Roux, Seung J. Lee, Hye-Sung Lee, Helena Lefebvre, Jinmian Li, Shuailong Li, Yichen Li, Wei Liu, Zhen Liu, Mickael Lonjon, Kun-Feng Lyu, Rafal Maciula, Roshan Mammen Abraham, Mohammad R. Masouminia, Josh McFayden, Oleksii Mikulenko, Mohammed M. A. Mohammed, Kirtimaan A. Mohan, Jorge G. Morfin, Ulrich Mosel, Martin Mosny, Khoirul F. Muzakka, Pavel Nadolsky, Toshiyuki Nakano, Saurabh Nangia, Angel Navascues Cornago, Laurence J. Nevay, Pierre Ninin, Emanuele R. Nocera, Takaaki Nomura, Rui Nunes, Nobuchika Okada, Fred Olness, John Osborne, Hidetoshi Otono, Maksym Ovchynnikov, Alessandro Papa, Junle Pei, Guillermo Peon, Gilad Perez, Luke Pickering, Simon Plaetzer, Ryan Plestid, Tanmay Kumar Poddar, Pablo Quilez, Mudit Rai, Meshkat Rajaee, Digesh Raut, Peter Reimitz, Filippo Resnati, Wolfgang Rhode, Peter Richardson, Adam Ritz, Hiroki Rokujo, Leszek Roszkowski, Tim Ruhe, Richard Ruiz, Marta Sabate-Gilarte, Alexander Sandrock, Ina Sarcevic, Subir Sarkar, Osamu Sato, Christiane Scherb, Ingo Schienbein, Holger Schulz, Pedro Schwaller, Sergio J. Sciutto, Dipan Sengupta, Lesya Shchutska, Takashi Shimomura, Federico Silvetti, Kuver Sinha, Torbjorn Sjostrand, Jan T. Sobczyk, Huayang Song, Jorge F. Soriano, Yotam Soreq, Anna Stasto, David Stuart, Shufang Su, Wei Su, Antoni Szczurek, Zahra Tabrizi, Yosuke Takubo, Marco Taoso, Brooks Thomas, Pierre Thonet, Douglas Tuckler, Agustin Sabio Vera, Heinz Vincke, K. N. Vishnudath, Zeren Simon Wang, Martin W. Winkler, Wenjie Wu, Keping Xie, Xun-Jie Xu, Tevong You, Ji-Young Yu, Jiang-Hao Yu, Korinna Zapp, Yongchao Zhang, Yue Zhang, Guanghui Zhou, Renata Zukanovich Funchal
Summary: High energy collisions at the High-Luminosity Large Hadron Collider (LHC) produce a large number of particles beyond the acceptance of existing experiments. The proposed Forward Physics Facility (FPF) will host experiments to probe standard model processes and search for physics beyond the standard model (BSM). FPF experiments will explore BSM physics through searches for new particle scattering or decay signatures and deviations from SM expectations in a low-background environment.
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
Giulia Zorzi, Luca Berta, Francesco Rizzetto, Cristina De Mattia, Marco Maria Jacopo Felisi, Stefano Carrazza, Silvia Nerini Molteni, Chiara Vismara, Francesco Scaglione, Angelo Vanzulli, Alberto Torresin, Paola Enrica Colombo
Summary: This study developed a pipeline for automatic extraction of quantitative metrics and radiomic features from lung CT and developed artificial intelligence models to support the differential diagnosis between COVID-19 and non-COVID-19 viral pneumonia. Through segmentation and feature extraction, four multilayer perceptron classifiers were built to accurately differentiate COVID-19 and non-COVID-19 pneumonia patients, providing support for clinical decisions.
EUROPEAN RADIOLOGY EXPERIMENTAL
(2023)
Article
Biophysics
Raffaella Fiamma Cabini, Leonardo Barzaghi, Davide Cicolari, Paolo Arosio, Stefano Carrazza, Silvia Figini, Marta Filibian, Andrea Gazzano, Rolf Krause, Manuel Mariani, Marco Peviani, Anna Pichiecchio, Diego Ulisse Pizzagalli, Alessandro Lascialfari
Summary: We proposed a deep learning (DL) method and an optimization strategy for the reconstruction of T1 and T2 maps acquired with preclinical magnetic resonance fingerprinting (MRF) sequences. Compared with the traditional dictionary-based method, the DL approach improved the estimation of the maps, and reduced the computational time required for estimation. Moreover, our DL method allowed us to maintain comparable reconstruction performance, even with compressed MRF acquisition sequences.
NMR IN BIOMEDICINE
(2023)
Article
Multidisciplinary Sciences
Thais L. Silva, Marcio M. Taddei, Stefano Carrazza, Leandro Aolita
Summary: This study presents a new high-precision QITE algorithm that partitions the evolution into probabilistically run fragments, significantly reducing circuit depth and improving overall runtime and hardware requirements compared to previous approaches. This is particularly important for the early fault-tolerance stages of quantum hardware.
SCIENTIFIC REPORTS
(2023)
Proceedings Paper
Computer Science, Interdisciplinary Applications
S. Carrazza, S. Efthymiou, M. Lazzarin, A. Pasquale
Summary: In this paper, we provide an overview of the current development and recent technical achievements of Qibo, an open-source framework for quantum simulation. We describe the modular layout for backend abstraction introduced in version 0.1.7 and discuss the advantages of different backends, focusing on hardware accelerators for quantum state vector simulation. Lastly, we summarize the available primitives and models.
20TH INTERNATIONAL WORKSHOP ON ADVANCED COMPUTING AND ANALYSIS TECHNIQUES IN PHYSICS RESEARCH
(2023)
Article
Physics, Particles & Fields
Luc Darme, Celine Degrande, Claude Duhr, Benjamin Fuks, Mark Goodsell, Gudrun Heinrich, Valentin Hirschi, Stefan Hoche, Marius Hoefer, Joshua Isaacson, Olivier Mattelaer, Thorsten Ohl, Davide Pagani, Juergen Reuter, Peter Richardson, Steffen Schumann, Hua-Sheng Shao, Frank Siegert, Marco Zaro
Summary: This article presents an update and extension of the Universal FeynRules Output model format (UFO format), which is widely used in automated matrix-element generators and high-energy physics software. The newly proposed Universal Feynman Output format includes flexible and modular additions for particle decays, custom propagators, form factors, the renormalisation group running of parameters and masses, as well as higher-order quantum corrections.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
Luc Darme, Celine Degrande, Claude Duhr, Benjamin Fuks, Mark Goodsell, Gudrun Heinrich, Valentin Hirschi, Stefan Hoeche, Marius Hoefer, Joshua Isaacson, Olivier Mattelaer, Thorsten Ohl, Davide Pagani, Juergen Reuter, Peter Richardson, Steffen Schumann, Hua-Sheng Shao, Frank Siegert, Marco Zaro
Summary: This article presents an update of the Universal FeynRules Output model format, known as the UFO format, used by various automated matrix-element generators and high-energy physics software. It details different features proposed as extensions to the initial format in the past decade and collects them in the current second version of the model format, called the Universal Feynman Output format.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Quantum Science & Technology
Carlos Bravo-Prieto, Julien Baglio, Marco Ce, Anthony Francis, Dorota M. Grabowska, Stefano Carrazza
Summary: This article proposes and evaluates an alternative quantum generator architecture for Monte Carlo event generation. The new method achieves better results even with small training sample sets and is hardware-independent.
Article
Physics, Particles & Fields
Zahari Kassabov, Emanuele R. Nocera, Michael Wilson
Summary: This study demonstrates how an inaccurate determination of experimental uncertainty correlations in high-precision LHC measurements can affect the reliability of the associated chi(2) results. A regularization procedure is proposed to increase the stability of chi(2) by minimizing alterations to the covariance matrix of the measurements. Applying this procedure to the NNPDF4.0 global analysis of parton distribution functions utilizing numerous LHC measurements, it is found that the regularized chi(2) of the NNPDF4.0 determination is reduced by about 3 standard deviations without significantly altering the resulting PDFs upon refitting.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Quantum Science & Technology
Stavros Efthymiou, Marco Lazzarin, Andrea Pasquale, Stefano Carrazza
Summary: This study presents the first attempt to perform circuit-based quantum simulation using JIT compilation technique. It demonstrates that the novel approach simplifies implementation complexity without degrading performance.
Article
Physics, Particles & Fields
Rabah Abdul Khalek, Rhorry Gauld, Tommaso Giani, Emanuele R. Nocera, Tanjona R. Rabemananjara, Juan Rojo
Summary: This paper presents an updated determination of nuclear parton distributions (nPDFs) through a global NLO QCD analysis of hard processes. It takes into account data from fixed-target lepton-nucleus and proton-nucleus experiments as well as collider proton-nucleus experiments. The constraints from various measurements are considered for the first time in a global nPDF analysis and applied to both the nuclear PDFs and the free-proton PDF baseline. The results show evidence of nuclear-induced modifications to the partonic structure of heavy nuclei and have important implications for ongoing and future experimental programs.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
Richard D. Ball, Stefano Carrazza, Juan Cruz-Martinez, Luigi Del Debbio, Stefano Forte, Tommaso Giani, Shayan Iranipour, Zahari Kassabov, Jose Latorre, Emanuele R. Nocera, Rosalyn L. Pearson, Juan Rojo, Roy Stegeman, Christopher Schwan, Maria Ubiali, Cameron Voisey, Michael Wilson
Summary: We present NNPDF4.0, a new set of parton distribution functions (PDFs) based on a global dataset and machine learning techniques. The methodology includes the expansion of the dataset, optimization of hyperparameters, and the implementation of theoretical improvements. The results have been validated through closure tests and analyzed for their dependence on input choices. The implications of NNPDF4.0 on LHC processes have also been studied.
EUROPEAN PHYSICAL JOURNAL C
(2022)
