86 Works

Recent developments in Kira

P. Maierhöfer & J. Usovitsch
In this section, we report on the recent progress made in the development of the Feynman integral reduction program Kira. The development is focused on algorithmic improvements that are essential to extend the range of feasible high-precision calculations for present and future colliders like the FCC-ee.

Numerical multiloop calculations: sector decomposition and QMC integration in pySecDec

S. Borowka, G. Heinrich, S. Jahn, S.P. Jones, M. Kerner & J. Schlenk
The FCC-ee will allow the experimental uncertainties on several important observables, such as the electroweak precision observables (EWPOs), to be reduced by up to two orders of magnitude compared with the previous generation LEP and SLC experiments. To be able to best exploit this unprecedented boost in precision, it is also necessary for theoretical predictions to be known with sufficient accuracy. In practice, this means that very high-order perturbative corrections to electroweak precision observables and...

Top pair production and mass determination

A. Maier
The mass of the top quark can be measured in a well-defined scheme and with unrivalled precision at a future electron–positron collider, like the FCC-ee. The most sensitive observable is the total production cross-section for bbbarW+W-X final states near the top pair production threshold. I review the state of the art in theory predictions for this quantity.

CoLoRFulNNLO at work: a determination of αs

A. Kardos, S. Kluth, G. Somogyi, Z. Trócsányi, Z. Tulipánt & A. Verbytskyi
The most precise determination of fundamental parameters of the Standard Model is very important. One such fundamental parameter is the strong coupling of QCD. Its importance can be gauged by taking a look at the various experiments and configurations where it was measured; for an up-to-date summary. The precise measurement of such a parameter is difficult for two reasons. First, high-quality data with small and well-controlled uncertainties are needed. Second, high-precision calculations are needed from...

Introduction and overview

A. Blondel, J. Gluza, S. Jadach, P. Janot & T. Riemann
This report includes a collection of studies devoted to a discussion of (i) the status of theoretical efforts towards the calculation of higher-order Standard Model (SM) corrections needed for the FCC-ee precision measurement programme, (ii) the possibility of making discoveries in physics by means of these precision measurements, and (iii) methods and tools that must be developed to guarantee precision calculations of the observables to be measured. This report originates from presentations at the 11th...

Organization

D. Einfeld
No abstract.

Executive summary

No abstract.

Future physics opportunities for high-density QCD at the LHC with heavy-ion and proton beams

Editors: Z. Citron, A. Dainese, J. F. Grosse-Oetringhaus, J. M. Jowett, Y.-J. Lee & U. A. Wiedemann
The future opportunities for high-density QCD studies with ion and proton beams at the LHC are presented. Four major scientific goals are identified: the characterisation of the macroscopic long wavelength Quark-Gluon Plasma (QGP) properties with unprecedented precision, the investigation of the microscopic parton dynamics underlying QGP properties, the development of a unified picture of particle production and QCD dynamics from small (pp) to large (nucleus--nucleus) systems, the exploration of parton densities in nuclei in a...

Beam dynamics and layout of the SEE-LS

D. Einfeld & H. Ghasem
No abstract.

Building, infrastructure, and site

D. Einfeld
No abstract.

Lattice considerations

D. Einfeld
No abstract.

Diagnostic system

F. Perez
No abstract.

Chapter 1: Standard Model Processes

M. L. Mangano Et Al.
This chapter documents the production rates and typical distributions for a number of benchmark Standard Model processes, and discusses new dynamical phenomena arising at the highest energies available at this collider. We discuss the intrinsic physics interest in the measurement of these Standard Model processes, as well as their role as backgrounds for New Physics searches.

Preface

A. Dainese, M. Mangano, A. B. Meyer, A. Nisati, G. Salam & M. Vesterinen
The preface presents the motivation for making the report, the mandate of the five working groups and the corresponding conveners.

Precision predictions for Higgs decays in the (N)MSSM

F. Domingo, S. Heinemeyer, S. Paßehr & G. Weiglein
No abstract.

Acknowledgements

No abstract.

CERN Yellow Reports: Monographs, Vol. 4 (2020): LHC fixed target experiments: Report from the LHC Fixed Target Working Group of the CERN Physics Beyond Colliders Forum

Corresponding editor: Stefano.Redaelli@cern.ch Several fixed-target experiments at the LHC are being proposed and actively studied. Splitting of beam halo from the core by means of a bent crystal combined with a second bent crystal after the target has been suggested in order to study magnetic and electric dipole moments of short-lived particles. A similar scheme without the second crystal or other schemes with more conventional solid or gas targets have been proposed to study hadronic...

CERN Yellow Reports: Monographs, Vol 4 (2018): The Compact Linear Collider (CLIC) – Project Implementation Plan

Edited by: M. Aicheler, P.N. Burrows, N. Catalan, R. Corsini, M. Draper, J. Osborne,D. Schulte, S. Stapnes and M.J. Stuart Abstract: The Compact Linear Collider (CLIC) is a TeV-scale high-luminosity linear e + e − collider under development by international collaborations hosted by CERN. This document provides an overview of the design, technology, and implementation aspects of the CLIC accelerator. For an optimal exploitation of its physics potential, CLIC is foreseen to be built and...

CERN Yellow Reports: Monographs, Vol 2 (2017): Handbook of LHC Higgs cross sections: 4. Deciphering the nature of the Higgs sector

Edited by D. de Florian, C. Grojean, F. Maltoni, C. Mariotti, A. Nikitenko, M. Pieri, P. Savard, M. Schumacher, R. Tanaka CERN-2017-002-M, ISBN (Print) 978–92–9083–442–7, ISBN (PDF) 978–92–9083–443–4

Opportunities in flavour physics at the HL-LHC and HE-LHC

Ediotors: A. Cerri, V. V. Gligorov, S. Malvezzi, J. Martin Camalich & J. Zupan
Motivated by the success of the flavour physics programme carried out over the last decade at the Large Hadron Collider (LHC), we characterize in detail the physics potential of its High-Luminosity and High-Energy upgrades in this domain of physics. We document the extraordinary breadth of the HL/HE-LHC programme enabled by a putative Upgrade II of the dedicated flavour physics experiment LHCb and the evolution of the established flavour physics role of the ATLAS and CMS...

Training programme

A. Nadji
No abstract.

Appendix A: Synchrotron radiation characteristics

D. Einfeld
No abstract.

Project schedule

D. Einfeld
No abstract.

Control system

D. Fernandez
No abstract.

Unsubtractions at NNLO

J.J. Aguilera-Verdugo, F. Driencourt-Mangin, J. Plenter, S. Ramírez-Uribe, G. Rodrigo, G.F.R. Sborlini, W.J. Torres Bobadilla & S. Tracz
Computations in perturbative quantum field theory (pQFT) feature several aspects that, although intrinsically non-physical, are traditionally successfully eluded by modifying the dimen- sions of space–time. Closed loops in pQFT implicitly extrapolate the validity of the Standard Model (SM) to infinite energies—equivalent to zero distance—much above the Planck scale. We should expect this to be a legitimate procedure if the loop scattering amplitudes that contribute to the physical observables are either suppressed at very high energies,...

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