112 Works

Contents

No abstract.

Prospects for higher-order corrections to W pair production near threshold in the EFT approach

C. Schwinn
The precise measurement of the mass of the W boson plays an essential role for precision tests of the Standard Model (SM) and indirect searches for new physics through global fits to electroweak observables. Cross-section measurements near the W pair production threshold at a possible future e−e+ collider promise to reduce the experimental uncertainty to the level of 3 MeV at an International Linear Collider (ILC), while a high-luminosity circular collider offers a potential improvement...

Vertex functions in QCD—preparation for beyond two loops

J.A. Gracey
We summarise the algorithm to determine the two-loop off-shell three-point vertex functions of QCD before outlining the steps required to extend the results to three and more loops.

Effective field theory approach to QED corrections in flavour physics

M. Beneke, C. Bobeth & R. Szafron
Thanks to the accurate measurements performed at the low-energy facilities and the LHC, flavour physics of light quarks, especially the bottom quark, emerged on the precision frontier for tests of the Standard Model (SM) and in searches for new physics effects. On the theoretical side, short-distance perturbative higher-order QCD and electroweak corrections are under good control for many processes. Moreover, tremendous progress in lattice computations allows percentage to even subpercentage accuracy to be achieved for...

Higgs boson decays: theoretical status

M. Spira
No abstract.

Numerics for elliptic Feynman integrals

C. Bogner, I. Hönemann, K. Tempest, A. Schweitzer & S. Weinzierl
The Standard Model involves several heavy particles: the Z and W bosons, the Higgs boson, and the top quark. Precision studies of these particles require, on the theoretical side, quantum corrections at the two-loop order and beyond. It is a well-known fact that, starting from two loops, Feynman integrals with massive particles can no longer be expressed in terms of multiple polylogarithms. This immediately raises the following question. What is the larger class of functions...

CERN Yellow Reports: Monographs, Vol. 10 (2020): High-Luminosity Large Hadron Collider (HL-LHC): Technical design report

Editors: I. Béjar Alonso, O. Brüning, P. Fessia, M. Lamont, L. Rossi, L. Tavian, M. Zerlauth The Large Hadron Collider (LHC) is one of the largest scientific instruments ever built. Since opening up a new energy frontier for exploration in 2010, it has gathered a global user community of about 9000 scientists working in fundamental particle physics and the physics of hadronic matter at extreme temperature and density. To sustain and extend its discovery potential,...

Technical infrastructure

L. Tavian, M. Battistin, S. Bertolasi, C. Bertone, B. Di Girolamo, N. Dos Santos, K. Foraz, T. Hakulinen, P. Mattelaer, P. Muffat & P. Pepinster
The HL-LHC technical infrastructure includes the civil engineering, the electrical distribution, the cooling & ventilation, the access & alarm system, the technical monitoring, the transport, the logistics, the storage, and the operational safety.

SMEFT

S.D. Bakshi, J. Chakrabortty & S.K. Patra
In spite of the non-observation of any new resonances after the discovery of the Standard Model (SM) Higgs-like particle, which announces the success of the SM, we have enough reason to believe the existence of theories beyond it (BSM), with the SM as a part. As any such theory will affect the electroweak and the Higgs sector, and the sensitivity of these precision observables is bound to increase in the near future, indirect estimation of...

Machine layout and performance

G. Arduini, R. Bruce, R. De Maria, M. Giovannozzi, G. Iadarola, J. Jowett, E. Métral, Y. Papaphilippou & R. Tomás Garcia
The goal of the High-luminosity upgrade of the LHC is to deliver an integrated luminosity of at least 250 fb-1 per year (assuming at least 160 days of operation at high-luminosity) in each of the two high-luminosity general-purpose detectors, ATLAS and CMS, located at the interaction points (IP) 1 and 5, respectively. The ATLAS and CMS detectors will be upgraded to handle an average pile-up, the number of events per bunch crossing, of at least...

Global electroweak fit in the FCC-ee era

J. Erler & M. Schott
The top quark and Higgs boson masses have been predicted before their respective discoveries by the global fit of the Standard Model to electroweak precision data. With the Higgs boson discovery and the measurement of its mass, the last missing parameter of the Standard Model has been fixed and thus the internal consistency of the Standard Model can be probed at a new level by comparing direct measurements with the indirect predictions of the global...

High-Luminosity Large Hadron Collider

O. Brüning & L. Rossi
The Large Hadron Collider (LHC) was successfully commissioned in 2010 for proton–proton collisions with a 7 TeV centre-of-mass (c.o.m.) energy. It delivered 8 TeV c.o.m. proton collisions from April 2012 until the end of Run 1 in 2013. Following the Long Shutdown 1 (LS1) in 2013–2014, it operated with 13 TeV c.o.m. proton collisions during Run 2 from 2015 until the end of 2018, reaching a peak luminosity twice the nominal design value. At present...

Warm powering of the superconducting circuits

M. Martino, J-P. Burnet, M. Cerqueira Bastos, V.R. Herrero Gonzales, N. Kuczerowski, S. Pittet, H. Thiesen, Y. Thurel, B. Todd & S. Yammine
The warm powering of the HL-LHC involves the new circuits of the Inner Triplets and the Separation/Recombination magnets in Point 1 and Point 5, the powering of the 11 T magnets in Point 7, and the final R2E consolidation phase in LS3. The LHC was built with modular power converters to facilitate maintenance and integrate the redundancy principle. Redundancy was foreseen in power converters rated above 600 A. This has proven to be a real...

Circuit layout, powering and protection

F. Rodríguez Mateos, T.D. Catalão Rolhas Da Rosa, F. Menéndez Cámara, S. Yammine & M. Zerlauth
During LS2 and LS3, the HL-LHC upgrade will impose many changes to the magnet circuits of the LHC long- straight sections at points 1 and 5. The magnets will be installed in the machine during LS3. In addition to these changes, during LS2, two main dipole magnets (MB) will be replaced by 11T cryo-assemblies (MBH) in order to allow the addition of two extra collimators at warm to intercept dispersive beam losses originating from the...

Beam instrumentation and long-range beam–beam compensation

R. Jones, E. Bravin, T. Lefèvre & R. Veness
The extensive array of beam instrumentation with which the LHC is equipped has played a major role in its commissioning, rapid intensity ramp-up and safe and reliable operation. Much of this equipment will need consolidation by the time the LHC enters the High-Luminosity (HL) era, while the upgrade itself brings a number of new challenges. The installation of a completely new final focus system in the two high-luminosity LHC insertions implies the development of new...

Integration, (de-)installation and alignment

P. Fessia & H. Mainaud Durand
The HL-LHC will require modifying the machine and infrastructure installations of the LHC in several points along the Accelerator Ring, in particular: P1, P2, P4, P5, P6, P7 and P8. Part of the modifications and improvement in P2, P4, P7 and P8 shall be completed during Long Shutdown 2 (LS2) and be operational for LHC Run 3, while the largest part of the interventions will take place in Long Shutdown 3 (LS3) and they will...

CERN Yellow Reports: Monographs, Vol 3 (2017): Physics at the FCC-hh, a 100 TeV pp collider

Edited by M. L. Mangano CERN-2017-003-M, ISBN (Print) 978–92–9083–453-3, ISBN (PDF) 978–92–9083–454-0

CERN Yellow Reports: Monographs, Vol 2 (2018): The Compact Linear e+e− Collider (CLIC) : 2018 Summary Report

Corresponding editors: Philip N. Burrows (University of Oxford), Nuria Catalan Lasheras (CERN), Lucie Linssen (CERN), Marko Petrič (CERN), Aidan Robson (University of Glasgow), Daniel Schulte (CERN), Eva Sicking (CERN), Steinar Stapnes (CERN) Abstract: The Compact Linear Collider (CLIC) is a TeV-scale high-luminosity linear e+e− collider under development at CERN. Following the CLIC conceptual design published in 2012, this report provides an overview of the CLIC project, its current status, and future developments. It presents the...

CERN Yellow Reports: Monographs, Vol 5 (2019): History of the European Muon Collaboration (EMC)

The European Muon Collaboration (EMC), formed in the years 1972–1974, was one of the first large experimental particle physics collaborations with more than 100 physicists. Its aim was to study the quark structure of the nucleon through deep inelastic muon scattering. Two seminal discoveries were made; the EMC effect and the spin crisis. In this paper the history of the collaboration from beginning to end is described. The appendices describe some of the difficulties met...

CERN Yellow Reports: Monographs, Vol 2 (2020): SPS Beam Dump Facility: Comprehensive Design Study

Editors: M. Calviani, B. Goddard, R. Jacobsson and M. Lamont The proposed Beam Dump Facility (BDF) is foreseen to be located in the North Area of the Super Proton Synchrotron (SPS). It is designed to be able to serve both beam-dump-like and fixed-target experiments. The SPS and the new facility would offer unique possibilities to enter a new era of exploration at the intensity frontier. Possible options include searches for very weakly interacting particles predicted...

Collection of notes from ATLAS and CMS

ATLAS
Addendum to the report on the Physics at the HL-LHC, and perspectives for the HE-LHC. This addendum collects the original notes from the ATLAS and CMS Collaborations, used as input to the "Workshop on the Physics of HL-LHC, and Perspectives at HE-LHC", which took place between October 2017 and December 2018 at CERN.

αQED, eff (s) for precision physics at the FCC-ee/ILC

F. Jegerlehner
Discovering the ‘physics behind precision’ at future linear or circular colliders (ILC or FCC projects) requires improved SM predictions based on more precise input parameters. I will review the role of αQED, eff at future collider energies and report on possible progress based on results from low-energy machines.

e+e− → γγ at large angles for FCC-ee luminometry

C.M. Carloni, M. Chiesa, G. Montagna, O. Nicrosini & F. Piccinini
We examine large-angle two-photon production in e+e− annihilation as a possible process to monitor the luminosity of the FCC-ee. We review the current status of the theoretical pre- dictions and perform an exploratory phenomenological study of the next-to-leading and higher- order QED corrections using the Monte Carlo event generator BabaYaga@NLO. We also con- sider the one-loop weak corrections, which are necessary to meet the high-precision requirements of the FCC-ee. Possible ways to approach the target...

Perspectives of heavy quarkonium production at the FCC-ee

Z.-G. He & B.A. Kniehl
We review heavy quarkonium production, concentrating on the J/ψ case, by these two processes in Sections 8.1 and 8.2, respectively, and discuss the prospects of heavy quarkonium production at the FCC-ee beyond the current measurements made at B factories and CERN LEP-II. Section 8.3 contains a summary and an outlook.

NNLO corrections in four dimensions

R. Pittau
Currently, four-dimensional techniques applied to higher-order calculations are under active investigation. The main motivation for this is the need to simplify perturbative calculations necessary to cope with the precision requirements of the future LHC and FCC experiments. In this contribution, I review the four-dimensional regularisation or renormalization (FDR) approach to the computation of NNLO corrections in four dimensions. In particular, I describe how fully inclusive NNLO final-state quark-pair corrections are computed in FDR by directly...

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