Publications (49)
Initial state QED radiation aspects for future colliders
S. Frixione, E. Laenen, C. M. Carloni Calame +25
This white paper concerns theoretical and phenomenological aspects relevant to the physics of future colliders, in particular regarding initial-state QED radiation. The co…
Next-to-leading order jet cross sections in polarized hadronic collisions
D. de Florian, S. Frixione, A. Signer +1
We present a next-to-leading order computation in QCD of one-jet and two-jet cross sections in polarized hadronic collisions. Our results are obtained in the framework of a general…
Impact of NNLO QED corrections on lepton-proton scattering at MUSE
T. Engel, F. Hagelstein, M. Rocco +3
We present the complete next-to-next-to-leading order (NNLO) pure pointlike QED corrections to lepton-proton scattering, including three-photon-exchange contributions, and investig…
SCET approach to regularization-scheme dependence of QCD amplitudes
A. Broggio, Ch. Gnendiger, A. Signer +2
We investigate the regularization-scheme dependence of scattering amplitudes in massless QCD and find that the four-dimensional helicity scheme (FDH) and dimensional reduction (DRE…
Muon-electron scattering at NNLO
A. Broggio, T. Engel, A. Ferroglia +8
We present the first calculation of the complete set of NNLO QED corrections for muon-electron scattering. This includes leptonic, non-perturbative hadronic, and photonic contribut…
Improved muon decay simulation with McMule and Geant4
A. Gurgone, A. Papa, P. Schwendimann +10
The physics programme of the MEG II experiment can be extended with the search for new invisible particles produced in rare muon decays. The hunt for such elusive signals requires…
Small-mass effects in heavy-to-light form factors
T. Engel, C. Gnendiger, A. Signer +1
We present the heavy-to-light form factors with two different non-vanishing masses at next-to-next-to-leading order and study its expansion in the small mass. The leading term of t…
Complementarity in lepton-flavour violating muon decay experiments
A. Crivellin, S. Davidson, G. M. Pruna +1
This note presents an analysis of lepton-flavour-violating muon decays within the framework of a low-energy effective field theory that contains higher-dimensional operators allowe…
Off-shell effects for t-channel and s-channel single-top production at NLO in QCD
P. Falgari, F. Giannuzzi, P. Mellor +1
In this work we present a calculation of both t-channel and s-channel single-top production at next-to-leading order in QCD for the Tevatron and for the LHC at a centre-of-mass ene…
Theory for muon-electron scattering @ 10ppm: A report of the MUonE theory initiative
P. Banerjee, C. M. Carloni Calame, M. Chiesa +17
We review the current status of the theory predictions for elastic - scattering, describing the recent activities and future plans of the theory initiative related to the pr…
Event Generators for High-Energy Physics Experiments
J. M. Campbell, M. Diefenthaler, T. J. Hobbs +221
We provide an overview of the status of Monte-Carlo event generators for high-energy particle physics. Guided by the experimental needs and requirements, we highlight areas of acti…
Electron-Positron Annihilation into Four Jets at Next-to-Leading Order in
A. Signer, L. Dixon
We calculate the rate for annihilation into four jets at next-to-leading order in perturbative QCD, but omitting terms that are suppressed by one or more powers of $1/\Nc^…
in FDH
C. Gnendiger, A. Signer
We investigate the regularization-scheme dependent treatment of in the framework of dimensional regularization, mainly focusing on the four-dimensional helicity scheme (FD…
Two-loop Correction to the Leptonic Decay of Quarkonium
M. Beneke, A. Signer, V. A. Smirnov
Applying asymptotic expansions at threshold, we compute the two-loop QCD correction to the short-distance coefficient that governs the leptonic decay of a S-wave qu…
Three-jet cross sections to next-to-leading order
S. Frixione, Z. Kunszt, A. Signer
One- and two-jet inclusive quantities in hadron collisions have already been calculated to next-to-leading order accuracy, using both the subtraction and the cone method. Since the…
To , or not to : Recent developments and comparisons of regularization schemes
C. Gnendiger, A. Signer, D. Stöckinger +16
We give an introduction to several regularization schemes that deal with ultraviolet and infrared singularities appearing in higher-order computations in quantum field theories. Co…
Towards pair production near threshold with unstable particle effective theory
M. Beneke, N. Kauer, A. Signer +1
We illustrate the use of effective theory techniques to describe processes involving unstable particles close to resonance. First, we present the main ideas in the context of a sca…
Effective theory approach to unstable particle production
M. Beneke, A. P. Chapovsky, A. Signer +1
Using the hierarchy of scales between the mass, , and the width, , of a heavy, unstable particle we construct an effective theory that allows calculations for resonant proce…
Electroweak Physics
G. Azuelos, U. Baur, J. van der Bij +47
We review the prospects for studies in electroweak physics at the LHC.
Anomalous triple and quartic gauge boson couplings
P. J. Dervan, A. Signer, W. J. Stirling +1
This article reviews some recent developments in the analysis of anomalous triple and quartic vector boson couplings that have been discussed at the UK Phenomenology Workshop on Co…
Infrared-Finite Amplitudes for Massless Gauge Theories
D. A. Forde, A. Signer
We present a method to construct infrared-finite amplitudes for gauge theories with massless fermions. Rather than computing -matrix elements between usual states of the Fock sp…
Top-Antitop Pair Production close to Threshold: Synopsis of recent NNLO Results
A. H. Hoang, M. Beneke, K. Melnikov +10
Using non-relativistic effective theories, new next-to-next-to-leading order (NNLO) QCD corrections to the total production cross section at the Linear Collider have been…
Computation of in FDH and DRED: renormalization, operator mixing, and explicit two-loop results
A. Broggio, Ch. Gnendiger, A. Signer +2
The amplitude relevant for Higgs production via gluon fusion is computed in the four-dimensional helicity scheme (FDH) and in dimensional reduction (DRED) at the two-loop…
QED at NNLO with McMule
P. Banerjee, T. Engel, A. Signer +1
McMule is a framework for fully differential higher-order QED calculations of scattering and decay processes involving leptons. It keeps finite lepton masses, which regularises col…
Renormalization-group improved fully differential cross sections for top pair production
A. Broggio, A. S. Papanastasiou, A. Signer
We extend approximate next-to-next-to-leading order results for top-pair production to include the semi-leptonic decays of top quarks in the narrow-width approximation. The new har…
Vector Boson Pair Production in Hadronic Collisions at Order : Lepton Correlations and Anomalous Couplings
L. Dixon, Z. Kunszt, A. Signer
We present cross sections for production of electroweak vector boson pairs, , and , in and collisions, at next-to-leading order in . We treat the…
Next-to-leading order corrections to e^+ e^- \to four jets
A. Signer
I present a general purpose Monte Carlo program for calculating the next-to-leading order corrections to arbitrary four-jet quantities in electron-positron annihilation. In the cur…
Helicity Amplitudes for Production of or Pairs at Hadron Colliders
L. Dixon, Z. Kunszt, A. Signer
We present the one-loop QCD corrections to the helicity amplitudes for the processes $q\qb \to W^+ W^-, Z Z, W^\pm Z, W^\pm γ$, or , including the subsequent decay of each m…
Effective theory calculation of resonant high-energy scattering
M. Beneke, A. P. Chapovsky, A. Signer +1
Tests of the standard model and its hypothetical extensions require precise theoretical predictions for processes involving massive, unstable particles. It is well-known that ordin…
Finite-width effects in unstable-particle production at hadron colliders
P. Falgari, A. S. Papanastasiou, A. Signer
We present a general formalism for the calculation of finite-width contributions to the differential production cross sections of unstable particles at hadron colliders. In this fo…
Gluon induced contributions to Z gamma production at hadron colliders
K. L. Adamson, D. de Florian, A. Signer
We study the contribution of gluon induced partonic subprocesses to Z gamma pair production at hadron colliders. These processes contribute only at next-to-next-to-leading order bu…
Multi-Parton Loop Amplitudes and Next-to-Leading Order Jet Cross-Sections
Z. Bern, L. Dixon, D. A. Kosower +1
We review recent developments in the calculation of QCD loop amplitudes with several external legs, and their application to next-to-leading order jet production cross-sections. Wh…
PSI/UZH Workshop: Impact of on New Physics Searches
A. Crivellin, M. Ghezzi, D. Müller +18
In these mini-proceedings we review the results of the workshop `Impact of on New Physics Searches' that took place at the Paul Scherrer Institute (PSI) on the 18th-…
Science Case for the new High-Intensity Muon Beams HIMB at PSI
M. Aiba, A. Amato, A. Antognini +33
In April 2021, scientists active in muon physics met to discuss and work out the physics case for the new High-Intensity Muon Beams (HIMB) project at PSI that could deliver of orde…
A two-loop application of the threshold expansion: the bottom quark mass from production
M. Beneke, A. Signer, V. A. Smirnov
We use the threshold expansion and non-relativistic effective theory to determine the bottom quark mass from moments of the production cross section at next-to-next-to-l…
Top quark production near threshold and the top quark mass
M. Beneke, A. Signer, V. A. Smirnov
We consider top-anti-top production near threshold in collisions, resumming Coulomb-enhanced corrections at next-to-next-to-leading order (NNLO). We also sum potentially…
The anomalous magnetic moment of the muon in the Standard Model: an update
R. Aliberti, T. Aoyama, E. Balzani +232
We present the current Standard Model (SM) prediction for the muon anomalous magnetic moment, , updating the first White Paper (WP20) [1]. The pure QED and electroweak contri…
HandyG -- rapid numerical evaluation of generalised polylogarithms in Fortran
L. Naterop, A. Signer, Y. Ulrich
Generalised polylogarithms naturally appear in higher-order calculations of quantum field theories. We present handyG, a Fortran 90 library for the evaluation of such functions, by…
Non-factorizable corrections and effective field theories
A. P. Chapovsky, V. A. Khoze, A. Signer +1
We analyze the structure of higher-order radiative corrections for processes with unstable particles. By subsequently integrating out the various scales that are induced by the pre…
Complete Order alpha_s^3 Results for e^+ e^- to (gamma,Z) to Four Jets
L. Dixon, A. Signer
We present the next-to-leading order (O(alpha_s^3)) perturbative QCD predictions for e^+e^- annihilation into four jets. A previous calculation omitted the O(alpha_s^3) terms suppr…
May the four be with you: Novel IR-subtraction methods to tackle NNLO calculations
W. J. Torres Bobadilla, G. F. R. Sborlini, P. Banerjee +21
In this report, we present a discussion about different frameworks to perform precise higher-order computations for high-energy physics. These approaches implement novel strategies…
Handbook of LHC Higgs Cross Sections: 4. Deciphering the Nature of the Higgs Sector
D. de Florian, C. Grojean, F. Maltoni +373
This Report summarizes the results of the activities of the LHC Higgs Cross Section Working Group in the period 2014-2016. The main goal of the working group was to present the sta…
The bottom quark mass from sum rules at next-to-next-to-leading order
M. Beneke, A. Signer
We determine the bottom quark mass and the quark mass in the potential subtraction scheme from moments of the production cross section and fro…
Fully differential NLO predictions for the rare muon decay
G. M. Pruna, A. Signer, Y. Ulrich
Using the automation program GoSam, fully differential NLO corrections were obtained for the rare decay of the muon . This process is an important Standard Model…
A subtraction scheme for massive QED
T. Engel, A. Signer, Y. Ulrich
We present an extension of the FKS subtraction scheme beyond next-to-leading order to deal with soft singularities in fully differential calculations within QED with massive fermio…
High-precision muon decay predictions for ALP searches
P. Banerjee, A. M. Coutinho, T. Engel +3
We present an improved theoretical prediction of the positron energy spectrum for the polarised Michel decay . In addition to the full next-to-next-to-le…
Fully differential NLO predictions for the radiative decay of muons and taus
G. M. Pruna, A. Signer, Y. Ulrich
We present a general purpose Monte Carlo program for the calculation of the radiative muon decay and the radiative decays and $Ï\toμ\…
WGamma and ZGamma production at Hadron Colliders
D. de Florian, A. Signer
We present a general purpose Monte Carlo program for the calculation of any infrared safe observable in WGamma and ZGamma production at hadron colliders at next-to-leading order in…
Gluon induced contributions to WZ and W gamma production at NNLO
K. L. Adamson, D. de Florian, A. Signer
We calculate the contribution of the partonic processes gg->WZ q\bar{q} and gg -> W gamma q\bar{q} to WZ and W gamma pair production at hadron colliders, including anomalous triple…